Scientific Publications
Scientific publications and exciting articles where PreciPoint products and solutions were successfully used.
Feng,; Y.,; Luo,; X.,; Li,; Z.,; Fan,; X.,; Wang,; Y.,; He,; R.-R.,; & Liu,; M.,
Use of M8 Microscope and Scanner Unveils Ferroptosis as Key Player in Radiation Colitis Offering Potential Relief and Mitigating Iron-Related Stress
Researchers have delved into the intricate mechanisms of radiation colitis, identifying ferroptosis as a pivotal process driven by iron-dependent lipid peroxidation and the accumulation of reactive oxygen species (ROS). Utilizing the M8 microscope and scanner, the study demonstrated that heightened iron levels and lipid peroxidation are key factors in irradiated intestine injury. Irradiation directly induced lipid peroxidation by elevating ROS production, with Acyl-CoA synthase long-chain family member 4 (ACSL4) playing a crucial role in iron-dependent peroxidation of polyunsaturated fatty acid (PUFA)-containing phospholipids in the plasma membrane, initiating ferroptosis. Additionally, the research revealed that intestinal bleeding exacerbated the inflammatory microenvironment\'s iron overload, involving macrophages. This discovery provides crucial insights into the pathology of radiation colitis, paving the way for targeted therapeutic approaches.
Result: Digital images of paraformaldehyde-fixed tumor tissue samples were recorded using M8 microscope and scanner. These tissue samples were embedded in paraffin that were then incubated with primary antibodies followed by incubation with secondary antibodies.
@article{nokey,
title = {A ferroptosis-targeting ceria anchored halloysite as orally drug delivery system for radiation colitis therapy},
author = {Feng and Y. and Luo and X. and Li and Z. and Fan and X. and Wang and Y. and He and R.-R. and & Liu and M.},
url = {https://www.nature.com/articles/s41467-023-40794-w},
doi = {10.1038/s41467-023-40794-w},
year = {2023},
date = {2023-08-22},
journal = {Nature Communications},
volume = {14},
issue = {1},
abstract = {Radiation colitis is the leading cause of diarrhea and hematochezia in pelvic radiotherapy patients. This work advances the pathogenesis of radiation colitis from the perspective of ferroptosis. An oral Pickering emulsion is stabilized with halloysite clay nanotubes to alleviate radiation colitis by inhibiting ferroptosis. Ceria nanozyme grown in situ on nanotubes can scavenge reactive oxygen species, and deferiprone was loaded into the lumen of nanotubes to relieve iron stress. These two strategies effectively inhibit lipid peroxidation and rescue ferroptosis in the intestinal microenvironment. The clay nanotubes play a critical role as either a medicine to alleviate colitis, a nanocarrier that targets the inflamed colon by electrostatic adsorption, or an interfacial stabilizer for emulsions. This ferroptosis-based strategy was effective in vitro and in vivo, providing a prospective candidate for radiotherapy protection via rational regulation of specific oxidative stress.
},
keywords = {M8},
pubstate = {published},
tppubtype = {article}
}
Mekapogu, Alpha Raj; Xu, Zhihong; Pothula, Srinivasa; Perera, Chamini; Pang, Tony; Hosen, S. M. Zahid; Damalanka, Vishnu; Janetka, James; Goldstein, David; Pirola, Romano; Wilson, Jeremy; Apte, Minoti
M8 Microscope and Scanner Used to Research Cytotoxic T-cell Infiltration and Pancreatic Tumour Growth and Metastasis
In a study facilitated by the M8 microscope and scanner, researchers have unveiled a strategy in the fight against pancreatic cancer. Their innovative approach combines HGF/c-MET inhibitors, targeting the intricate interactions between stromal cells and tumors, with chemotherapy (gemcitabine) to simultaneously address cancer cells. This combined treatment significantly reduces tumor volume, suppresses epithelial-mesenchymal transition (EMT), curbs stemness, and notably, eradicates metastasis. A key discovery in this study is that HGF/c-MET inhibition not only directly impacts cancer cells but also diminishes the secretion of TGF-β by these cells. This reduction leads to a substantial increase in the infiltration of cytotoxic T-cells into the tumor, promoting the demise of cancer cells within the affected tissues. Moreover, the combination of HGF/c-MET inhibition and chemotherapy exhibits an additional benefit—it normalizes the gut microbiome and enhances the diversity of gut microbial communities.
Result: Preserved pancreas tissue samples, treated with formalin, and encased in paraffin, were sectioned into slices just five micrometers thick. Utilizing M8 microscope and scanner, researchers captured high-resolution 20x magnification images covering the entire specimen. These images were analyzed to quantify the DAB-positive area/cells within the tissue sections.
@article{nokeyz,
title = {HGF/c-Met pathway inhibition combined with chemotherapy increases cytotoxic T-cell infiltration and inhibits pancreatic tumour growth and metastasis},
author = {Alpha Raj Mekapogu and Zhihong Xu and Srinivasa Pothula and Chamini Perera and Tony Pang and S.M. Zahid Hosen and Vishnu Damalanka and James Janetka and David Goldstein and Romano Pirola and Jeremy Wilson and Minoti Apte},
url = {https://doi.org/10.1016/j.canlet.2023.216286},
doi = {10.1016/j.canlet.2023.216286},
year = {2023},
date = {2023-08-01},
urldate = {2023-08-01},
journal = {Elsevier},
volume = {568},
abstract = {Pancreatic cancer (PC) is a deadly cancer with a high mortality rate. The unique characteristics of PC, including desmoplasia and immunosuppression, have made it difficult to develop effective treatment strategies. Pancreatic stellate cells (PSCs) play a crucial role in the progression of the disease by interacting with cancer cells. One of the key mediators of PSC - cancer cell interactions is the hepatocyte growth factor (HGF)/c-MET pathway. Using an immunocompetent in vivo model of PC as well as in vitro experiments, this study has shown that a combined approach using HGF/c-MET inhibitors to target stromal-tumour interactions and chemotherapy (gemcitabine) to target cancer cells effectively decreases tumour volume, EMT, and stemness, and importantly, eliminates metastasis. Notably, HGF/c-MET inhibition decreases TGF-β secretion by cancer cells, resulting in an increase in cytotoxic T-cell infiltration, thus contributing to cancer cell death in tumours. HGF/c-MET inhibition + chemotherapy was also found to normalise the gut microbiome and improve gut microbial diversity. These findings provide a strong platform for assessment of this triple therapy (HGF/c-MET inhibition + chemotherapy) approach in the clinical setting.},
keywords = {M8},
pubstate = {published},
tppubtype = {article}
}
Zhang,; G.-K.,; Ren,; J.,; Li,; J.-P.,; Wang,; D.-X.,; Wang,; S.-N.,; Shi,; L.-Y.,; & Li,; C.-Y.,
Research Using M8 Microscope and Scanner Finds Injectable Hydrogel Antler RM Matrix Accelerating Wound Healing Rate and Reducing Scar Formation
Concluded with the help of M8 microscope and scanner, research showed that HARM accelerated wound healing rate and reduced scar formation in deer antlers. Also, HARM stimulated the regeneration of cutaneous appendages and blood vessels, and reduced collagen fiber aggregation. Further study showed that these functions might be achieved via creating a fetal-like niche at the wound site. The levels of fetal wound healing-related genes, including Collagen III and TGFβ3 treated with HARM were all increased, while the expression levels of Collagen I, TGFβ1, and Engrailed 1 were decreased in the healing. Moreover, the number of stem cells was increased in the fetal-like niche created by HARM, which may contribute to the regeneration of cutaneous appendages.
Result: The healed skin tissue was embedded in paraffin and subjected to HE, Masson, and IF staining. The HE and Masson-stained sections were captured using the imaging capabilities of the M8 digital microscope. This enabled the examination of cellular changes and connective tissue organization and provided valuable insights into the healing process.
@article{nokey,
title = {Injectable hydrogel made from antler mesenchyme matrix for regenerative wound healing via creating a fetal-like niche},
author = {Zhang and G.-K. and Ren and J. and Li and J.-P. and Wang and D.-X. and Wang and S.-N. and Shi and L.-Y. and & Li and C.-Y.},
url = {https://www.wjgnet.com/1948-0210/full/v15/i7/768.htm},
doi = {10.4252/wjsc.v15.i7.768},
year = {2023},
date = {2023-07-26},
journal = {World Journal of Stem Cells},
volume = {15},
issue = {7},
pages = {768-780},
abstract = {BACKGROUND
Scar formation and loss of cutaneous appendages are the greatest challenges in cutaneous wound healing. Previous studies have indicated that antler reserve mesenchyme (RM) cells and their conditioned medium improved regenerative wound healing with partial recovery of cutaneous appendages.
AIM
To develop hydrogels from the antler RM matrix (HARM) and evaluate the effect on wound healing.
METHODS
We prepared the hydrogels from the HARM via enzymatic solubilization with pepsin. Then we investigated the therapeutic effects of HARM on a full-thickness cutaneous wound healing rat model using both local injections surrounding the wound and topical wound application.
RESULTS
The results showed that HARM accelerated wound healing rate and reduced scar formation. Also, HARM stimulated the regeneration of cutaneous appendages and blood vessels, and reduced collagen fiber aggregation. Further study showed that these functions might be achieved via creating a fetal-like niche at the wound site. The levels of fetal wound healing-related genes, including Collagen III and TGFβ3 treated with HARM were all increased, while the expression levels of Collagen I, TGFβ1, and Engrailed 1 were decreased in the healing. Moreover, the number of stem cells was increased in the fetal-like niche created by HARM, which may contribute to the regeneration of cutaneous appendages.
CONCLUSION
Overall, we successfully developed an injectable hydrogel made from antler RM matrix for the regenerative repair of full-thickness cutaneous wounds. We uncovered the molecular mechanism of the hydrogels in promoting regenerative wound healing, and thus pave the way for HARM to be developed for the clinic use.},
keywords = {M8},
pubstate = {published},
tppubtype = {article}
}
Scar formation and loss of cutaneous appendages are the greatest challenges in cutaneous wound healing. Previous studies have indicated that antler reserve mesenchyme (RM) cells and their conditioned medium improved regenerative wound healing with partial recovery of cutaneous appendages.
AIM
To develop hydrogels from the antler RM matrix (HARM) and evaluate the effect on wound healing.
METHODS
We prepared the hydrogels from the HARM via enzymatic solubilization with pepsin. Then we investigated the therapeutic effects of HARM on a full-thickness cutaneous wound healing rat model using both local injections surrounding the wound and topical wound application.
RESULTS
The results showed that HARM accelerated wound healing rate and reduced scar formation. Also, HARM stimulated the regeneration of cutaneous appendages and blood vessels, and reduced collagen fiber aggregation. Further study showed that these functions might be achieved via creating a fetal-like niche at the wound site. The levels of fetal wound healing-related genes, including Collagen III and TGFβ3 treated with HARM were all increased, while the expression levels of Collagen I, TGFβ1, and Engrailed 1 were decreased in the healing. Moreover, the number of stem cells was increased in the fetal-like niche created by HARM, which may contribute to the regeneration of cutaneous appendages.
CONCLUSION
Overall, we successfully developed an injectable hydrogel made from antler RM matrix for the regenerative repair of full-thickness cutaneous wounds. We uncovered the molecular mechanism of the hydrogels in promoting regenerative wound healing, and thus pave the way for HARM to be developed for the clinic use.
Zuo,; Z.,; Wang,; S.,; Ye,; B.,; Wang,; Q.,; Wang,; D.,; Wu,; Q.,; Xu,; G.,; Zou,; J.,; Xie,; S.,; & Wang,; G.,
M8 Microscope and Scanner Reveals Improved Immune Response in Hybrid Snakeheads Subjected to Ammonia Stress and Fed a Kelp Meal Diet
In an extensive study aimed at addressing sugar intolerance in predatory fish, researchers explored the potential of kelp meal as a substitute for dietary flour. Employing the M8 microscope and scanner, they conducted a thorough multi-tissue analysis, encompassing survival rates, histopathology, biochemical parameters, and transcriptional responses of immune-related genes in hybrid snakeheads (Channa maculatus ♀ × Channa argus ♂). The research not only provided insights into the metabolic effects but also evaluated the ammonia stress resistance effects of varying kelp meal levels. This investigation, enhancing our understanding of fish physiology, offers crucial implications for aquaculture practices, with the M8 microscope and scanner contributing valuable precision to the study\'s outcomes.
Result: Following ethanol and methanol treatment of the fish’s liver specimen, the sample was embedded in paraffin. High-quality histopathological images of the samples were obtained using the M8 digital microscope and slide scanner after hematoxylin and eosin (H & E) staining.
@bachelorthesis{nokey,
title = {Dietary kelp meal (Thallus laminariae) improves the immunity of hybrid snakeheads under ammonia stress},
author = {Zuo and Z. and Wang and S. and Ye and B. and Wang and Q. and Wang and D. and Wu and Q. and Xu and G. and Zou and J. and Xie and S. and & Wang and G.},
url = {https://www.sciencedirect.com/science/article/pii/S2352513423002235},
doi = {10.1016/j.aqrep.2023.101684},
year = {2023},
date = {2023-07-24},
journal = {Aquaculture Reports},
volume = {31},
pages = {101684},
abstract = {This study determined the effect of dietary kelp meal (KM) on metabolism of the hybrid snakeheads (Channa maculatus ♀ × Channa argus ♂), and the spatiotemporal changes in their resistance to ammonia stress, including survival rate, histopathology, biochemical parameters, and the expression of immune-related genes. The experimental diets contained: 0% KM, 5% KM, 10% KM, 15% KM, 15% KM + 5% binder. After eight weeks of feeding, six fish per diet were sampled for metabolic studies, and the remaining fish were placed under ammonia stress at two concentrations (1200 mg/L and 120 mg/L) for 48 h. Our results showed that replacing flour with kelp meal to the diet could alter the activities of some metabolic enzymes and reduced the lethality of hybrid snakeheads under high ammonia exposure. Histopathological results revealed a variety of pathological features in the liver after exposure to ammonia nitrogen. The levels of glutamate dehydrogenase (GDH), glutamine synthetase (GS), superoxide dismutase (SOD), catalase (CAT), and malondialdehyde (MDA) showed the trend of first increasing and then decreasing with the decrease of the flour concentration in the diet under high concentration of ammonia stress. Besides, kidneys receive more severe oxidative damage than the liver. Similar results were found in the mRNA abundance of immune-related genes, and the kidney were mostly significantly down-regulated, but feeding moderate amounts of kelp meal can alleviate this damage. The transcriptome analysis showed that kelp meal can affect antigen processing and presentation process by the MHCⅠ signaling pathway mechanism, and thus regulate the immune response of hybrid snakeheads. Our study suggests that adding kelp meal in the diets could improve the ability of hybrid snakeheads to resist ammonia stress and the optimal replacement group is 10% KM group.},
keywords = {M8},
pubstate = {published},
tppubtype = {bachelorthesis}
}
Li,; F.,; Yang,; J.,; Li,; Y.,; Tan,; Z.,; Li,; H.,; & Zhang,; N.,
M8 Microscope and Scanner Helps Researchers Explore the Role of lncRNA FENDRR and Fibroblast Suppressor in Colorectal Cancer
In a study, researchers delved beyond the conventional scope of FENDRR research, which primarily focuses on its impact on cancer cells. Utilizing the M8 microscope and canner, researchers unraveled the intricate relationship between aberrant FENDRR expression, its unique localization patterns, and genetically altered fibroblasts in colorectal cancer (CRC). Their primary objective was to elucidate the role of FENDRR within the stromal compartment of CRC patients through innovative bioinformatics analyses. The findings of the research shed light on a previously unexplored aspect: FENDRR\'s ability to suppress cancer-associated fibroblasts by impeding their activation and collagen production in CRC. These discoveries have far-reaching implications, suggesting that diminished FENDRR expression correlates with a dismal prognosis for CRC patients. This insight positions FENDRR as a promising therapeutic target in future CRC studies.
Result: The FENDRR RNA in situ hybridization (ISH) data were captured and interpreted using M8 microscope and slide scanner. The positivity for FENDRR expression was determined based on the presence of intracellular brown punctate dots.
@bachelorthesis{nokey,
title = {Long non-coding RNA FENDRR suppresses cancer-associated fibroblasts and serves as a prognostic indicator in colorectal cancer},
author = {Li and F. and Yang and J. and Li and Y. and Tan and Z. and Li and H. and & Zhang and N.},
url = {https://www.sciencedirect.com/science/article/pii/S1936523323001262},
doi = {10.1016/j.tranon.2023.101740},
year = {2023},
date = {2023-07-18},
journal = {Translational Oncology},
volume = {36},
pages = {101740},
abstract = {Genetically abnormal fibroblasts are notably more prevalent in colorectal cancer (CRC) than in adjacent normal tissue, emphasizing their significance in driving the heterogeneity of the tumor microenvironment. Functioning as a significant regulatory gene in the context of fibrosis, FOXF1 adjacent non-coding developmental regulatory RNA (FENDRR) has exhibited abnormal expression in colorectal cancer and interstitial localization in our experiments. However, current research on the role of FENDRR in cancer has focused solely on its impact on cancer cells. Its crucial role in the tumor stroma is yet to be explored. The goal of this study was to understand the relationship between atypical FENDRR expression, its distinct localization, and genetically abnormal fibroblasts in CRC. We aimed to establish the function of FENDRR within the stromal compartment of patients through bioinformatics. Our study confirmed that FENDRR suppresses cancer-associated fibroblasts by inhibiting their activation and collagen generation in CRC. Furthermore, our findings suggest that low FENDRR expression indicates a poor prognosis. Therefore, we propose that FENDRR is a promising therapeutic target for future studies in CRC.},
keywords = {M8},
pubstate = {published},
tppubtype = {bachelorthesis}
}
Wang, Yiran; Yu, Jiajie; Zhang, Xiang; He, Yaxin; Chen, Song; Fan, Erqin; Qu, Guanzheng; Chen, Su; Liu, Caixia
M8 Microscope and Scanner Helps Examine the Phenotypic Differences Between Double Haploid Poplars and Wild-type Poplars
Researchers leverage the high-resolution capabilities of the M8 microscope and scanner to explore the phenotypic differences between homozygous poplar doubled haploid (DH) plants and their paternal counterparts. Rigorous morphological and histological analyses reveal distinct traits, including reduced plant height, smaller ground diameter, altered leaf aspect ratio, premature senescence of the top bud, and specific changes in the shape and cell area of the shoot apical meristem. RNA-seq transcriptome sequencing uncovers significantly differentially expressed genes, subjected to in-depth scrutiny through GO enrichment and KEGG analysis. Crucial transcription factors are identified and validated via qRT-PCR, elucidating gene function. Remarkably, hormone-responsive genes exhibit diverse expressions under IAA and ABA treatments, indicating the DH plants\' unique hormone responsiveness. Differentially expressed genes in DH plants encompass processes such as oxidative stress response, salicylic acid response, plant-pathogen interaction, and plant hormone signal transduction. A comprehensive TF-centered gene regulatory network for phytohormone synthesis and plant senescence is meticulously constructed.
Result: The SAM and stem fragments were preserved using FAA solution, followed by a gradual dehydration process using ethanol. Afterward, they were sequentially incubated in xylene. These treated samples were then embedded and sliced into 16 μm sections. The sections were stained with 0.1% toluidine blue. Finally, the sections were interpreted using an M8 microscope and scanner, along with Viewpoint 4.6.0 software.
@article{nokeyy,
title = {Morphological, Histological, and Transcriptome Analysis of Doubled Haploid Plants in Poplars (Populus simonii × Populus nigra)},
author = {Yiran Wang and Jiajie Yu and Xiang Zhang and Yaxin He and Song Chen and Erqin Fan and Guanzheng Qu and Su Chen and Caixia Liu},
url = {https://doi.org/10.3390/f14081535},
doi = {10.3390/f14081535},
year = {2023},
date = {2023-07-07},
urldate = {2023-07-07},
journal = {forests},
volume = {14},
issue = {8},
abstract = {In this study, the poplar doubled haploid (DH) plants were used as the experimental material to explore the huge phenotypic differences between homozygous DH plants and the paternal plants, and the molecular regulation mechanism of the differential phenotypes. In this experiment, through morphological and histological observation and statistics, we found that the double haploid plants had significantly reduced plant height and ground diameter, increased leaf aspect ratio, premature senescence phenotype of top bud, and significant changes in the shape and cell area of the shoot apical meristem. Significantly differentially expressed genes were obtained using RNA-seq transcriptome sequencing. They were subjected to GO enrichment and KEGG analysis. Transcription factors with key functions were screened out for qRT-PCR to verify gene expression changes to predict gene function. The results showed that after the IAA and ABA treatment, the expression levels of some hormone-responsive genes in wild type plants were significantly changed with different treatment time. In the dihaploid plants, the corresponding genes also changed to different degrees, which reflected the changes in the response of the dihaploid plants to hormones. Compared to in WT, the differential expressed genes in the double haploids were involved in multiple physiological process such as response to oxidative stress, response to salicylic acid, plant pathogen interaction, and plant hormone signal transduction. A TF–centered gene regulatory network for phytohormone synthesis and plant senescence was constructed with the expression patterns of differentially expressed transcription factors (TFs). This study increases researchers’ understanding of the regulation of poplar growth and development and provides new research ideas for the creation of new species of poplar.
},
keywords = {M8, ViewPoint},
pubstate = {published},
tppubtype = {article}
}
Li,; X.,; Shi,; W.,; Wei,; G.,; Lv,; J.,; Wang,; D.,; Xing,; B.,; Zhou,; J.,; Zhao,; J.,; & Sun,; H.,
M8 Microscope and Scanner Used in Studying Annual Regeneration Process of Deer Antlers
Researchers have hypothesized that galectin, a group of carbohydrate-binding proteins with an affinity for β-galactosides, could be instrumental in the annual regeneration process of deer antlers. Using immunohistochemistry, Western blotting (WB), and quantitative polymerase chain reaction (QPCR) with the assistance of the M8 microscope and scanner, scientists investigated the expression levels of GAL-1 in antler tissues and cells. Their study revealed that GAL-1 was extensively present in key areas like the antlerogenic periosteum (AP), pedicle periosteum (PP), and the antler growth center. Notably, the research extended its focus to human umbilical vein endothelial cells (HUVECs) and their behavior under the influence of GAL-1. The proliferation, migration, and tube formation assays conducted on HUVECs demonstrated a significant decrease (P < 0.05) in the proangiogenic activity of APCGAL-1−/− medium compared to APCs medium. These findings shed light on the vital role of GAL-1 in the regeneration process of deer antlers and its impact on angiogenesis, providing valuable insights into both developmental biology and potential therapeutic applications.
Result: The tissue samples were prepared for HE staining by staining with hematoxylin and a blue-black background with ammonia after rehydration. Eosin was used as a counterstain for alkaline substances. The sections were then dehydrated, mounted with neutral resin, and interpreted using the M8 microscope and scanner.
@article{nokey,
title = {Galectin-1 promotes angiogenesis and chondrogenesis during antler regeneration},
author = {Li and X. and Shi and W. and Wei and G. and Lv and J. and Wang and D. and Xing and B. and Zhou and J. and Zhao and J. and & Sun and H.},
url = {https://cmbl.biomedcentral.com/articles/10.1186/s11658-023-00456-7},
doi = {10.1186/s11658-023-00456-7},
year = {2023},
date = {2023-05-15},
journal = {In Cellular & Molecular Biology Letters},
volume = {28},
issue = {1},
abstract = {Background
Deer antlers are the only known mammalian structure that undergoes full regeneration. In addition, it is peculiar because when growing, it contains vascularized cartilage. The differentiation of antler stem cells (ASCs) into chondrocytes while inducing endochondral extension of blood vessels is necessary to form antler vascularized cartilage. Therefore, antlers provide an unparalleled opportunity to investigate chondrogenesis, angiogenesis, and regenerative medicine. A study found that Galectin-1 (GAL-1), which can be used as a marker in some tumors, is highly expressed in ASCs. This intrigued us to investigate what role GAL-1 could play in antler regeneration.
Methods
We measured the expression level of GAL-1 in antler tissues and cells by immunohistochemistry, WB and QPCR. We constructed antlerogenic periosteal cells (APCs, one cell type of ASCs) with the GAL-1 gene knocked out (APCGAL-1−/−) using CRISPR-CAS9 gene editing system. The effect of GAL-1 on angiogenesis was determined by stimulating human umbilical vein endothelial cells (HUVECs) using APCGAL-1−/− conditioned medium or adding exogenous deer GAL-1 protein. The effect of APCGAL-1−/− on chondrogenic differentiation was evaluated compared with the APCs under micro-mass culture. The gene expression pattern of APCGAL-1−/− was analyzed by transcriptome sequencing.
Results
Immunohistochemistry revealed that GAL-1 was widely expressed in the antlerogenic periosteum (AP), pedicle periosteum (PP) and antler growth center. Western blot and qRT-PCR analysis using deer cell lines further supports this result. The proliferation, migration, and tube formation assays of human umbilical vein endothelial cells (HUVECs) showed that the proangiogenic activity of APCGAL-1−/− medium was significantly decreased (P < 0.05) compared with the APCs medium. The proangiogenic activity of deer GAL-1 protein was further confirmed by adding exogenous deer GAL-1 protein (P < 0.05). The chondrogenic differentiation ability of APCGAL-1−/− was impeded under micro-mass culture. The terms of GO and KEGG enrichment of the differentially expressed genes (DEGs) of APCGAL-1−/− showed that down-regulated expression of pathways associated with deer antler angiogenesis, osteogenesis and stem cell pluripotency, such as the PI3K-AKT signaling pathway, signaling pathways regulating pluripotency of stem cells and TGF-β signaling pathway.
Conclusions
Deer GAL-1, has strong angiogenic activity, is widely and highly expressed in deer antler. The APCs can induce angiogenesis by secreting GAL-1. The knockout of GAL-1 gene of APCs damaged its ability to induce angiogenesis and differentiate into chondrocytes. This ability is crucial to the formation of deer antler vascularized cartilage. Moreover, Deer antlers offer a unique model to explore explore how angiogenesis at high levels of GAL-1 expression can be elegantly regulated without becoming cancerous.},
keywords = {M8},
pubstate = {published},
tppubtype = {article}
}
Deer antlers are the only known mammalian structure that undergoes full regeneration. In addition, it is peculiar because when growing, it contains vascularized cartilage. The differentiation of antler stem cells (ASCs) into chondrocytes while inducing endochondral extension of blood vessels is necessary to form antler vascularized cartilage. Therefore, antlers provide an unparalleled opportunity to investigate chondrogenesis, angiogenesis, and regenerative medicine. A study found that Galectin-1 (GAL-1), which can be used as a marker in some tumors, is highly expressed in ASCs. This intrigued us to investigate what role GAL-1 could play in antler regeneration.
Methods
We measured the expression level of GAL-1 in antler tissues and cells by immunohistochemistry, WB and QPCR. We constructed antlerogenic periosteal cells (APCs, one cell type of ASCs) with the GAL-1 gene knocked out (APCGAL-1−/−) using CRISPR-CAS9 gene editing system. The effect of GAL-1 on angiogenesis was determined by stimulating human umbilical vein endothelial cells (HUVECs) using APCGAL-1−/− conditioned medium or adding exogenous deer GAL-1 protein. The effect of APCGAL-1−/− on chondrogenic differentiation was evaluated compared with the APCs under micro-mass culture. The gene expression pattern of APCGAL-1−/− was analyzed by transcriptome sequencing.
Results
Immunohistochemistry revealed that GAL-1 was widely expressed in the antlerogenic periosteum (AP), pedicle periosteum (PP) and antler growth center. Western blot and qRT-PCR analysis using deer cell lines further supports this result. The proliferation, migration, and tube formation assays of human umbilical vein endothelial cells (HUVECs) showed that the proangiogenic activity of APCGAL-1−/− medium was significantly decreased (P < 0.05) compared with the APCs medium. The proangiogenic activity of deer GAL-1 protein was further confirmed by adding exogenous deer GAL-1 protein (P < 0.05). The chondrogenic differentiation ability of APCGAL-1−/− was impeded under micro-mass culture. The terms of GO and KEGG enrichment of the differentially expressed genes (DEGs) of APCGAL-1−/− showed that down-regulated expression of pathways associated with deer antler angiogenesis, osteogenesis and stem cell pluripotency, such as the PI3K-AKT signaling pathway, signaling pathways regulating pluripotency of stem cells and TGF-β signaling pathway.
Conclusions
Deer GAL-1, has strong angiogenic activity, is widely and highly expressed in deer antler. The APCs can induce angiogenesis by secreting GAL-1. The knockout of GAL-1 gene of APCs damaged its ability to induce angiogenesis and differentiate into chondrocytes. This ability is crucial to the formation of deer antler vascularized cartilage. Moreover, Deer antlers offer a unique model to explore explore how angiogenesis at high levels of GAL-1 expression can be elegantly regulated without becoming cancerous.
Izquierdo,; A., M.; Dederichs,; M., T.; Cargnelutti,; F.,; & Michalik,; P.,
Fritz Slide Scanner Used to Study the Copulatory Behavior and Genital Mechanisms of Sperm Allocation in a Pholcid Spider
Researchers employed advanced techniques and a multidisciplinary approach to explore the reproductive behavior and copulatory mechanics of Gertschiola neuquena Huber, 2000, a small ground-dwelling spider found in the arid regions of southern Argentina. Utilizing the Fritz slide scanner, the team conducted in-depth investigations through mating trials, cryofixation, histology, micro-computed tomography, three-dimensional surface reconstruction, and scanning electron microscopy (SEM). Their comprehensive study delved into various aspects, including the general morphology of male and female genitalia, courtship and mating behavior, genital locking mechanisms, genital coupling, and the intricate interaction between male and female genital structures during copulation. This research shed light on the nuanced reproductive mechanisms of this unique spider species inhabiting the dry landscapes of southern Argentina.
Result: Sections of the specimens for histological analysis were digitized using a Fritz slide scanner. Researchers showed that the species copulates with one pedipalp, making this behavior astonishing among pholcids.
@article{nokey,
title = {Copulatory behaviour and genital mechanics suggest sperm allocation by a non-intromittent sclerite in a pholcid spider},
author = {Izquierdo and M. A. and Dederichs and T. M. and Cargnelutti and F. and & Michalik and P.},
url = {https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.230263},
doi = {10.1098/rsos.230263},
year = {2023},
date = {2023-05-02},
journal = {Royal Society Open Science},
volume = {10},
issue = {5},
abstract = {The male genitalia of pholcid spiders, which is one of the most species-rich spider families, are characterized by a procursus, which is a morphologically diverse projection of the copulatory organ. It has been shown that the procursus interacts with the female genitalia during copulation. Here, we investigate the function of the procursus in Gertschiola neuquena, a species belonging to the early branched and understudied subfamily Ninetinae, using behavioural and morphological data. Although many aspects of the copulatory behaviour of G. neuquena follow the general pattern described for the family, males use only one pedipalp during each copulation. Based on our micro-CT analysis of cryofixed mating pairs using virgin females, we can show that the long and filiform procursus is inserted deeply into the unpaired convoluted female spermatheca, and the intromittent sclerite, the embolus, is rather short and stout only reaching the most distal part of the female sperm storage organ. Histological data revealed that sperm are present in the most proximal part of the spermatheca, suggesting that the procursus is used to allocate sperm deeply into the female sperm storage organ. This represents the first case of a replacement of the sperm allocation function of the intromittent sclerite in spiders.},
keywords = {Fritz},
pubstate = {published},
tppubtype = {article}
}
Mealey-Farr, Robert; Jeong, Jinho; Park, Juhyung; Liu, Shuo; Hausmann, Simone; Francis, Joel W.; Ibanez, Maria Angulo; Cho, Joonseok; Chua, Katrin; Mazur, Pawel K.; Gozani, Or
M8 Microscope and Scanner Aids Discover Distinct Lysine Methylation Events on eEF1A Influence mRNA Translation Elongation Dynamics
Leveraging the precision of the M8 microscope and scanner, researchers dove into the complexities of gene expression, focusing on the fundamental process of protein synthesis. Modulation of mRNA translation at the elongation step is a key regulatory node shaping cellular proteomes. In this context, they explored the impact of five distinct lysine methylation events on eukaryotic elongation factor 1A (eEF1A). Despite its significance, progress in understanding eEF1A lysine methylation was hindered by a lack of affinity tools. Through the development and characterization of a suite of selective antibodies, researchers uncovered subtle cell-to-cell variability and active crosstalk between different methylation sites on eEF1A. The findings revealed declining eEF1A methylation levels in aged tissues, particularly in muscle. The research provided insights into eEF1A methylation-related functions and highlighted its role in aging biology through protein synthesis regulation.
Result: Researchers used eEF1A methylation-specific antibodies, which were diluted at a ratio of 1:200. To develop the IHC, they employed DAB as the detection system, and hematoxylin was used to counterstain the samples. Researchers captured and interpreted images of the samples using the M8 microscope and scanner equipped with ViewPoint software.
@bachelorthesis{nokeyx,
title = {Antibody toolkit to investigate eEF1A methylation dynamics in mRNA translation elongation},
author = {Robert Mealey-Farr and Jinho Jeong and Juhyung Park and Shuo Liu and Simone Hausmann and Joel W. Francis and Maria Angulo Ibanez and Joonseok Cho and Katrin Chua and Pawel K. Mazur and Or Gozani},
url = {DOI:https://doi.org/10.1016/j.jbc.2023.104747},
doi = {10.1016/j.jbc.2023.104747},
year = {2023},
date = {2023-04-23},
urldate = {2023-04-23},
journal = {Journal of Biological Chemistry},
volume = {299},
issue = {6},
abstract = {Protein synthesis is a fundamental step in gene expression, with modulation of mRNA translation at the elongation step emerging as an important regulatory node in shaping cellular proteomes. In this context, five distinct lysine methylation events on eukaryotic elongation factor 1A (eEF1A), a fundamental nonribosomal elongation factor, are proposed to influence mRNA translation elongation dynamics. However, a lack of affinity tools has hindered progress in fully understanding how eEF1A lysine methylation impacts protein synthesis. Here we develop and characterize a suite of selective antibodies to investigate eEF1A methylation and provide evidence that methylation levels decline in aged tissue. Determination of the methyl state and stoichiometry on eEF1A in various cell lines by mass spectrometry shows modest cell-to-cell variability. We also find by Western blot analysis that knockdown of individual eEF1A-specific lysine methyltransferases leads to depletion of the cognate lysine methylation event and indicates active crosstalk between different sites. Further, we find that the antibodies are specific in immunohistochemistry applications. Finally, application of the antibody toolkit suggests that several eEF1A methylation events decrease in aged muscle tissue. Together, our study provides a roadmap for leveraging methyl state and sequence-selective antibody reagents to accelerate discovery of eEF1A methylation-related functions and suggests a role for eEF1A methylation, via protein synthesis regulation, in aging biology.
},
keywords = {M8, ViewPoint},
pubstate = {published},
tppubtype = {bachelorthesis}
}