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Spermatogonia stem cell

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https://www.readbyqxmd.com/read/27869554/genome-wide-deletion-screening-with-the-array-cgh-method-in-mouse-offspring-derived-from-irradiated-spermatogonia-indicates-that-mutagenic-responses-are-highly-variable-among-genes
#1
Jun-Ichi Asakawa, Mieko Kodaira, Akiko Miura, Takanori Tsuji, Yoshiko Nakamoto, Masaaki Imanaka, Jun Kitamura, Harry Cullings, Mayumi Nishimura, Yoshiya Shimada, Nori Nakamura
Until the end of the 20th century, mouse germ cell data on induced mutation rates, which were collected using classical genetic methods at preselected specific loci, provided the principal basis for estimates of genetic risks from radiation in humans. The work reported on here is an extension of earlier efforts in this area using molecular methods. It focuses on validating the use of array comparative genomic hybridization (array CGH) methods for identifying radiation-induced copy number variants (CNVs) and specifically for DNA deletions...
November 21, 2016: Radiation Research
https://www.readbyqxmd.com/read/27862128/regulation-of-crucial-lncrnas-in-differentiation-of-chicken-embryonic-stem-cells-to-spermatogonia-stem-cells
#2
D Li, Y Ji, F Wang, Y Wang, M Wang, C Zhang, W Zhang, Z Lu, C Sun, M F Ahmed, N He, K Jin, S Cheng, Y Wang, Y He, J Song, Y Zhang, B Li
Regulation of crucial lncRNAs involved in differentiation of chicken embryonic stem cells (ESCs) to spermatogonia stem cells (SSCs) was explored by sequencing the transcriptome of ESCs, primordial germ cells (PGCs) and SSCs with RNA-Seq; analytical bioinformatic methods were used to excavate candidate lncRNAs. We detected expression of candidate lncRNAs in ESCs, PGCs and SSCs and forecasted related target genes. Utilizing wego, david and string, function and protein-protein interactions of target genes were analyzed...
November 14, 2016: Animal Genetics
https://www.readbyqxmd.com/read/27861152/rad9a-is-required-for-spermatogonia-differentiation-in-mice
#3
Lin Huang, Zhen-Bo Wang, Shu-Tao Qi, Xue-Shan Ma, Qiu-Xia Liang, Guo Lei, Tie-Gang Meng, Li-Feng Liang, Ye-Xin Xian, Yi Hou, Xiao-Fang Sun, Yong Zhao, Wei-Hua Wang, Qing-Yuan Sun
Spermatogenesis in testes requires precise spermatogonia differentiation. Spermatocytes lacking the Rad9a gene are arrested in pachytene prophase, implying a possible role for RAD9A in spermatogonia differentiation. However, numerous RAD9A-positive pachytene spermatocytes are still observed in mouse testes following Rad9a excision using the Stra8-Cre system, and it is unclear whether Rad9a deletion in spermatogonia interrupts differentiation. Here, we generated a mouse model in which Rad9a was specifically deleted in spermatogonial stem cells (SSCs) using Cre recombinase expression driven by the germ cell-specific Vasa promoter...
November 16, 2016: Oncotarget
https://www.readbyqxmd.com/read/27834666/proliferation-in-culture-of-primordial-germ-cells-derived-from-embryonic-stem-cell-induction-by-retinoic-acid
#4
Zohreh Makoolati, Mansoureh Movahedin, Mehdi Forouzandeh-Moghadam
An in vitro system that supports primordial germ cells (PGCs) survival and proliferation is useful for enhancement of these cells and efficient transplantation in infertility disorders. One approach is cultivation of PGCs under proper conditions that allow self-renewal and proliferation of PGCs. For this purpose, we compared the effects of different concentrations of retinoic acid (RA), and the effect of PGCs co-culture with STO cells on the proliferation of embryonic stem cells (ESCs)- derived PGCs. One-day-old embryoid body (EB) was cultured for 4 days in simple culture system at the presence of 5 ng/ml BMP4 (SCB group) for PGC induction...
November 10, 2016: Bioscience Reports
https://www.readbyqxmd.com/read/27827452/gdnf-expressing-sto-feeder-layer-supports-the-long-term-propagation-of-undifferentiated-mouse-spermatogonia-with-stem-cell-properties
#5
Xiang Wei, Yuanyuan Jia, Yuanyuan Xue, Lei Geng, Min Wang, Lufan Li, Mei Wang, Xuemei Zhang, Xin Wu
The development of a stem cell culture system would expedite our understanding of the biology of tissue regeneration. Spermatogonial stem cell (SSC) is the foundation for lifelong male spermatogenesis and the SSC culture has been optimized continuously in recent years. However, there have been many inconveniences to reconstruct SSC self-renewal and proliferation in vitro, such as the frequent refreshment of recombinant cytokines, including GDNF, the essential growth factor for SSC maintenance. In the present study, we observed that both STO and MEF cells, which were previously used as feeders for SSC growth, did not express GDNF, but a GDNF-expressing STO feeder could support undifferentiated mouse spermatogonia propagation in vitro for three months without the refreshment of recombinant growth factor GDNF...
November 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27822884/lncrna-ak015322-promotes-proliferation-of-spermatogonial-stem-cell-c18-4-by-acting-as-a-decoy-for-microrna-19b-3p
#6
Ke Hu, Jing Zhang, Meng Liang
Long noncoding RNAs (lncRNAs) have been reported to play important roles in male reproduction. In our previous research, we studied the expression profile of lncRNAs in mouse male germ cells including spermatogonial stem cell, type A spermatogonia, pachytene spermatocyte, and round spermatid by microarray method, which showed that testis-enriched lncRNA AK015322 is highly expressed in spermatogonial stem cell. In this study, we found that AK015322 promotes proliferation of mouse spermatogonial stem cell line C18-4 in vitro...
November 7, 2016: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/27821019/molecular-signatures-of-primary-human-spermatogonial-progenitors-and-its-neighboring-peritubular-stromal-compartment
#7
Abhishek Harichandan, Kavitha Sivasubramaniyan, Joerg Hennenlotter, Sven Poths, Jens Bedke, Stephan Kruck, Arnulf Stenzl, Hans-Jörg Bühring
In depth understanding of human spermatogenesis requires studying specific molecular signatures and interactions of spermatogonia with other testicular cell populations, for which isolation of pure populations of different cell types is crucial. Here we describe a technique to simultaneously enrich pure, multiple testicular cell populations including spermatogonia, endothelial (TECs) and perivascular mesenchymal stem/stromal cells (TMSCs) from testicular tissue by flow cytometry using a combination of defined markers...
November 7, 2016: Stem Cells and Development
https://www.readbyqxmd.com/read/27819720/male-idiopathic-infertility-and-the-tp53-polymorphism-in-codon-72
#8
M P de Morais, R F Curado, K S F E Silva, K K V O Moura, J T Arruda
Many environmental agents affect the development of male germ cells at different stages. Apoptosis is common during normal spermatogenesis; it plays an important role in controlling the number of germ cells and the disposal of defective stem cells to produce functional sperm. The presence of p53 in primary spermatocytes suggests that it plays a role in the prophase of meiosis. p53 is expressed in the testis in both spermatocytes and spermatogonia. This suggests that the p53 gene (TP53) is important for apoptosis regulation during spermatogenesis, and may be associated with male infertility...
November 3, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27798668/the-lin28-expression-in-stallion-testes
#9
Geumhui Lee, Heejun Jung, Minjung Yoon
The molecular markers for specific germ cell stages can be utilized for identifying, monitoring, and separating a particular stage of germ cells. The RNA-binding protein Lin28 is expressed in gonocytes of human fetal testes. The Lin28 expression is restricted to a very small population of spermatogonial cells in human, mice, and monkey. The main objective of this study was to investigate the expression pattern of Lin28 in stallion testes at different reproductive stages. Based on the presence or absence of full spermatogenesis and lumina in seminiferous tubules, the testicular samples were categorized into two reproductive stages pre-pubertal and post-pubertal...
2016: PloS One
https://www.readbyqxmd.com/read/27795714/bmp4-cooperates-with-retinoic-acid-to-induce-the-expression-of-differentiation-markers-in-cultured-mouse-spermatogonia
#10
Yongguang Yang, Yanmin Feng, Xue Feng, Shangying Liao, Xiuxia Wang, Haiyun Gan, Lixian Wang, Xiwen Lin, Chunsheng Han
Spermatogenesis is sustained by the proliferation and differentiation of spermatogonial stem cells (SSCs). However, the molecules controlling these processes remain largely unknown. Here, we developed a simplified high concentration serum-containing system for the culture of mouse SSCs. Analysis of SSCs markers and transplantation results revealed that the cultured spermatogonia retained stem cell characteristics after long-term in vitro propagation. Using this culture system, the expression and function of bone morphogenetic protein 4 (BMP4) were explored...
2016: Stem Cells International
https://www.readbyqxmd.com/read/27774720/immunolocalization-of-proteins-in-the-spermatogenesis-process-of-canine
#11
Ncg Pieri, A F Souza, Acf Mançanares, Kcs Roballo, J B Casals, C E Ambrosio, D S Martins
Spermatogenesis is a process in which differentiated cells are produced and the adult stem cell population-known as spermatogonial stem cells (SSCs)-is continuously replenished. However, the molecular mechanisms underlying these processes are not fully understood in the canine species. We addressed this in this study by analysing the expression of specific markers in spermatogonia of seminiferous tubules of canine testes. SSCs at different stages of reproductive development (prepubertal and adult) were examined by immunohistochemistry and flow cytometry...
October 23, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27769051/melatonin-promotes-goat-spermatogonia-stem-cells-sscs-proliferation-by-stimulating-glial-cell-line-derived-neurotrophic-factor-gdnf-production-in-sertoli-cells
#12
Bowen Niu, Bo Li, Chongyang Wu, Jiang Wu, Yuan Yan, Rui Shang, Chunling Bai, Guangpeng Li, Jinlian Hua
Melatonin has been reported to be an important endogenous hormone for regulating neurogenesis, immunityand the biological clock. Recently, the effects of melatonin on neural stem cells (NSCs), mesenchymal stem cells(MSCs), and induced pluripotent stem cells(iPSCs) have been reported; however, the effects of melatonin on spermatogonia stem cells (SSCs) are not clear. Here, 1μM and 1nM melatonin was added to medium when goat SSCs were cultured in vitro, the results showed that melatonin could increase the formation and size of SSC colonies...
October 18, 2016: Oncotarget
https://www.readbyqxmd.com/read/27768780/over-expression-of-nanos3-and-dazl-in-human-embryonic-stem-cells
#13
Sarita Panula, Ahmed Reda, Jan-Bernd Stukenborg, Cyril Ramathal, Meena Sukhwani, Halima Albalushi, Daniel Edsgärd, Michiko Nakamura, Olle Söder, Kyle E Orwig, Shinya Yamanaka, Renee A Reijo Pera, Outi Hovatta
The mechanisms underlying human germ cell development are largely unknown, partly due to the scarcity of primordial germ cells and the inaccessibility of the human germline to genetic analysis. Human embryonic stem cells can differentiate to germ cells in vitro and can be genetically modified to study the genetic requirements for germ cell development. Here, we studied NANOS3 and DAZL, which have critical roles in germ cell development in several species, via their over expression in human embryonic stem cells using global transcriptional analysis, in vitro germ cell differentiation, and in vivo germ cell formation assay by xenotransplantation...
2016: PloS One
https://www.readbyqxmd.com/read/27734357/rattus-norvegicus-spermatogenesis-colony-forming-assays
#14
F Kent Hamra
Knowledge gaps persist on signaling pathways and metabolic states in germ cells sufficient to support spermatogenesis independent of a somatic environment. Consequently, methods to culture mammalian stem cells through spermatogenesis in defined systems have not been established. Lack of success at culturing mammalian stem cells through spermatogenesis in defined systems reflects an inability to experimentally recapitulate biochemical events that develop in germ cells during a seminiferous epithelial cycle. Complex germ and somatic cell associations that develop each seminiferous epithelial cycle support such a hypothesis, conceivably explaining why highly pure mammalian spermatogonia have not developed into meiosis, much less through meiosis without somatic cells...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27734355/transplantation-as-a-quantitative-assay-to-study-mammalian-male-germline-stem-cells
#15
Aileen R Helsel, Jon M Oatley
In mammals, the activities of spermatogonial stem cells (SSCs) provide the foundation for continual spermatogenesis throughout a male's reproductive lifetime. At present, the defining characteristics of SSCs and mechanisms controlling their fate decisions are not well understood. Transplantation is a definitive functional measure of stem cell capacity for male germ cells that can be used as an assay to provide an unequivocal quantification of the SSC content in an experimental cell population. Here, we discuss the procedure for mice and provide protocols for preparing donor germ cell suspensions from testes directly or primary cultures of spermatogonia for transplantation, enriching for SSCs, preparing recipient males, microinjection into recipient testes, and considerations for experimental design...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27734354/visualization-and-lineage-tracing-of-pax7-spermatogonial-stem-cells-in-the-mouse
#16
Gina M Aloisio, Ileana Cuevas, Yuji Nakada, Christopher G Peña, Diego H Castrillon
The precise identity of spermatogonial stem cells-the germline stem cell of the adult testis-remains a controversial topic. Technical limitations have included the lack of specific markers and methods for lineage tracing of Asingle spermatogonia and their subsets. Immunolocalization of proteins in tissue sections has been a standard tool for the in situ identification and visualization of rare cellular subsets. However, these studies are limited by the need for faithful and reliable protein markers to define these cell types, as well as the availability of specific antibodies to these markers...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27733379/tspan8-expression-distinguishes-spermatogonial-stem-cells-in-the-prepubertal-mouse-testis
#17
Kazadi Mutoji, Anukriti Singh, Thu Nguyen, Heidi Gildersleeve, Amy V Kaucher, Melissa J Oatley, Jon M Oatley, Ellen K Velte, Christopher B Geyer, Keren Cheng, John R McCarrey, Brian P Hermann
Precise separation of spermatogonial stem cells (SSCs) from progenitor spermatogonia that lack stem cell activity and are committed to differentiation remains a challenge. To distinguish between these spermatogonial subtypes, we identified genes that exhibited bimodal mRNA levels at the single-cell level among undifferentiated spermatogonia from Postnatal Day 6 mouse testes, including Tspan8, Epha2, and Pvr, each of which encode cell surface proteins useful for cell selection. Transplantation studies provided definitive evidence that a TSPAN8-high subpopulation is enriched for SSCs...
December 2016: Biology of Reproduction
https://www.readbyqxmd.com/read/27725702/dynamin-2-is-essential-for-mammalian-spermatogenesis
#18
Kate A Redgrove, Ilana R Bernstein, Victoria J Pye, Bettina P Mihalas, Jessie M Sutherland, Brett Nixon, Adam McCluskey, Phillip J Robinson, Janet E Holt, Eileen A McLaughlin
The dynamin family of proteins play important regulatory roles in membrane remodelling and endocytosis, especially within brain and neuronal tissues. In the context of reproduction, dynamin 1 (DNM1) and dynamin 2 (DNM2) have recently been shown to act as key mediators of sperm acrosome formation and function. However, little is known about the roles that these proteins play in the developing testicular germ cells. In this study, we employed a DNM2 germ cell-specific knockout model to investigate the role of DNM2 in spermatogenesis...
October 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27709383/effect-of-granulocyte-colony-stimulating-factor-immobilized-by-the-electron-beam-synthesis-nanotechnology-on-reparative-regeneration-of-spermatogenous-tissue
#19
T G Borovskaya, A M Dygai, Yu A Shchemerova, S I Kamalova, V A Mashanova, A V Vychuzhanina, M E Poluektova, P G Madonov, D N Kinsht, V E Goldberg
Effectiveness of the granulocyte colony-stimulating factor immobilized by using electronbeam synthesis nanotechnology was investigated on the model of experimental testicular failure caused by the toxic effect on stem spermatogonia. Administration of the drug to experimental paclitaxel-treated animals increased the number of sources of the proliferative pool of spermatogenesis and its productivity. The effectiveness of immobilized granulocyte colony-stimulating factor was based on its ability to stimulate reparative regeneration of the spermatogenic tissue, which manifested in a decrease in spermatogenic layer maturity and increase in the number of microenvironment cells...
September 2016: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27702397/isolation-characterization-and-in-vitro-culturing-of-spermatogonial-stem-cells-in-japanese-quail-coturnix-japonica
#20
Ravindran Kumar Pramod, Bo Ram Lee, Young Min Kim, Hong Jo Lee, Young Hyun Park, Tamao Ono, Jeong Mook Lim, Jae Yong Han
We reported previously testis-mediated germline chimera production and characterization of germline stem cell-like cells from chicken testes. The present study aimed to establish an in vitro system for culture of quail spermatogonial stem cells (SSCs) for practical applications in germline preservation and transgenesis. Testicular cells (TCs) from juvenile (4 weeks old) or adult (8 weeks old) quail testis were isolated using sequential enzymatic digestion. The percentages of viability of isolated TCs were 91...
October 3, 2016: Stem Cells and Development
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