SPERMATOGONIAL STEM CELLS THESIS

SPERMATOGONIAL STEM CELLS THESIS

Methods Spermatogonial stem cells were isolated and purified from human testicular biopsies sample consisting of at least , and at most 2,, cells. Pluripotent stem cells derived from adult human testes. In this study, the culture process was evaluated after 52 days of specific human spermatogonial stem cells culture by GPR staining. Then, suspended cells were collected and cultured in SFM with some supplements and growth factors: Culturing human spermatogonial stem cell had not been reported until that Sadri et al were able to propagate the Human Spermatogonial Stem Cells In vitro Human spermatogonial stem cell clusters were observed after 7 to 10 days in specific culture, then after several passages and successful expanding duration of 52 days, the cells were evaluated by three layer immunocytochemistry test LSAB to stain GPR protein as a surface marker in human spermatogonial stem cells.

Differential plating was suggested to enrich spermaogonia in cell suspension derived from testis sample after enzymatic digestion by some articles 9 , Different types of human spermatogonia include progenitor Adark-spermatogonia, progenitor Apale-spermatogonia, committed Apale-spermatogonia, and B-spermatogonia. It should be mentioned that at this stage of studies identifying specific markers, enrichment and isolation undifferentiated spermatogonia from somatic cells and differentiated germ cells were fulfilled by researches. In Chapter 3, I used this knowledge about the phenotype of human spermatogonia to show that the best method to cryopreserve intact human testicular pieces is controlled slow-freezing. The spermatogonial cells, which remained in suspension, were collected before plating 9.

Then, dehydration was performed through a series of graded alcohols. Infertility is an unfortunate side effect of some cancer therapies that impacts the quality of life of survivors who are in their reproductive or pre-reproductive years. Beta 1- and alpha 6-integrin are surface markers on mouse spermatogonial stem cells.

spermatogonial stem cells thesis

Culturing human psermatogonial stem cell had not been reported until that Sadri theais al were able to propagate the Human Spermatogonial Stem Cells In vitro The self-renewal and commitment for differentiation of stem cells occurs from stages X — VIII of seminiferous epithelium. This study is based on 12 biopsy samples taken from different azoospermic patients referred to Avicenna infertility clinic center for operating TESE procedure testicular sperm extraction Next, streptavidin-HRP complex Invitrogen was added to the cells for 30 min and treated by diaminobenzidine DAB as the chromogen and hematoxyline as counterstian.

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Making and using antibodies: After 3 hours examination, we observed many cells that had suspended and the majority of cells transferred with spermatogonia to SFM.

spermatogonial stem cells thesis

After 52 days of culture, the cells were trypsinated and cytospind onto slides for DAB staining GPR protein as surface marker on these cells. Somatic cells attached at the bottom of plastic dish in primary culture of testis cells after collecting the floating media and suspended cells.

In this way, we could prevent excessive loss of cells and restrict proliferation somatic cells by decreasing serum in culture cel,s at last. In culture field, Kanatsu-Shinohara et al cultured mouse SSCs in such a way that these cells propagated themselves on a feeder layer.

They are the sprmatogonial cell type that can repopulate and restore fertility to congenitally infertile recipient mice following transplantation 13 Received Apr 18; Accepted Sep We have also studied differential plating to enrich human spermatogonia on digested cell suspension in two aspects.

The homeostasis of male genitalia in mammals is maintained by a group of stem cells called spermatogonial stem cells SSCs which replenishes worn out cells in the testicular tissue. This study has introduced a method to isolate and enrich human spermatogonial stem cells without common manipulations of the cells clls is usual in cell sorting methods.

For a long-term culture, spermatogonial stem cells cluster could not be supported by gelatin coated dish alone probably after aging fibroblastic cells. Differential plating was suggested to sper,atogonial spermaogonia in cell suspension derived from testis sample after enzymatic digestion by some articles 9 Isolation, characterization, and culture of human spermatogonia.

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Isolation of male germ-line stem cells; influence of GDNF.

National Center for Biotechnology InformationU. He et alisolated GPRpositive spermatogonia from adult human testis, followed by magnetic-activated cell sorting.

Preserving male fertility with spermatogonial stem cells

Human germ cells colonies were attached to laminin coated thesie without fibroblast accompaniment after the second passage. Nevertheless, the plate that related to overnight primary culture showed appropriate somatic cells attachment during this period Figure 1B. Sertoli and myoid cells attached to the culture plates. Slides were fixed in NBF for 10 min.

Isolation and Culture of Human Spermatogonial Stem Cells Derived from Testis Biopsy

On the other hand, we observed that when primary cell count was more than 10 6 cells in digested cell suspension, differential plating, was beneficial to enrich human spermatogonia and decrease disturbing of somatic cells before transferring the cells to SFM.

Assessment of nycodenz gradient on enrichment and culture of perinatal porcine spermatogonial stem cells; [NCSU libraries]: Introduction Today, treating cancer in children has been improved immensely. It should be mentioned that we collected the colonies after 52 days to evaluate the culture system by immonochemistry test. The spermatogonial cells, thrsis remained in suspension, were collected before plating 9.

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Preserving male fertility with spermatogonial stem cells. Two enzymatic digestion steps were performed by 2. The progenitor Adark-spermatogonia apparently are stems or reserve spermatogonia 2.

spermatogonial stem cells thesis