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Journal of Ovarian Research

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Open Access 01-12-2015 | Research

Very small embryonic-like stem cells are the elusive mouse endometrial stem cells- a pilot study

Authors: Pranesh Gunjal, Deepa Bhartiya, Siddhanath Metkari, Dhananjay Manjramkar, Hiren Patel

Published in: Journal of Ovarian Research | Issue 1/2015

Abstract

Background

Endometrium undergoes dramatic growth, breakdown and regeneration throughout reproductive period in mammals. Stem cells have been implicated in the process however their origin, nature, anatomical localization and characterization still remain obscure. Classical concept of presence of stem cells in the basal layer of endometrium was recently challenged when side population and label retaining cells were found to be distributed throughout endometrium. We have earlier reported very small embryonic-like stem cells (VSELs) in adult mammalian ovary and testis as a small population of cells with nuclear OCT-4 along with progenitors (spermatogonial stem cells and ovarian germ stem cells) with cytoplasmic OCT-4. Present study was undertaken to gauge presence of VSELs in bilaterally ovariectomized mouse uterus and their modulation by hormones.

Methods

Bilaterally ovariectomized mice were subjected to sequential estradiol and progesterone treatment in order to induce proliferation, differentiation and remodeling (regeneration). Stem cells were studied in tissue smears after H & E staining and after sorting using SCA-1 by immuno-localization and qRT-PCR studies (Oct-4A, Nanog and Sca-1). Flow cytometry studies were also undertaken to confirm the presence of VSELs in mouse uterus.

Results

Two distinct populations of stem cells with dark stained nucleus and high nucleo-cytoplasmic ratio were detected in ovariectomized mouse uterus. These cells were sorted using SCA-1 and comprised smaller VSELs with nuclear expression of OCT-4 and slightly bigger, more abundant progenitors termed as endometrial stem cells (EnSCs) with cytoplasmic OCT-4. RT-PCR studies showed presence of pluripotent transcripts (Oct-4, Sca-1) and flow cytometry confirmed the presence of 0.069% of LIN-/CD45-/SCA-1+ VSELs. These stem cells were distinctly regulated during endometrial growth, differentiation and regeneration as evidenced by qRT-PCR results.

Conclusions

VSELs are present in normal uterus and also under conditions of atrophy induced by bilateral ovariectomy. Marked increase in EnSCs is associated with endometrial growth and regeneration. Further studies are warranted to define the niche for these stem cells and whether EnSCs arising from the pluripotent VSELs are common progenitors for epithelial and stromal cells or not remains to be addressed. Results of the present study will help in better understanding of endometrial pathologies and their management in the future.

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Title: Very small embryonic-like stem cells are the elusive mouse endometrial stem cells- a pilot study
Authors: Pranesh Gunjal
Deepa Bhartiya
Siddhanath Metkari
Dhananjay Manjramkar
Hiren Patel
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Journal of Ovarian Research / Issue 1/2015
Electronic ISSN: 1757-2215
DOI: https://doi.org/10.1186/s13048-015-0138-2

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Very small embryonic-like stem cells are the elusive mouse endometrial stem cells- a pilot study

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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