Abstract
Compared to embryonic and induced pluripotent stem cells, mesenchymal stem/stromal cells (MSCs) have made their presence felt with good therapeutic promise and safety profile. Transplanting MSCs has successfully helped to reverse infertility and resulted in live births in animal models and also in humans. But the underlying mechanism for their therapeutic potential is not yet clear. MSCs are not pluripotent and hence lack plasticity to differentiate into multiple adult cell types. They rather act as ‘paracrine providers’ to the tissue-resident stem cells since similar beneficial effects are also observed when their secretome (microvesicles or exosomes) is transplanted. Cytokines, growth factors, signaling lipids, mRNAs, and miRNAs secreted by MSCs enables tissue-resident stem cells to undergo differentiation into specific cell types. Tissue-resident stem cells include pluripotent, very small embryonic-like stem cells (VSELs) and progenitors [spermatogonial (SSCs), ovarian (OSCs) and endometrial (EnSCs) stem cells in testes, ovary and uterus respectively] which function in a subtle manner to maintain life-long tissue homeostasis and regenerate damaged (non-functional) reproductive tissues by differentiating into sperm, oocytes and endometrial epithelial cells respectively. Similar to restoring spermatogenesis, primordial follicles numbers are increased upon transplanting MSCs. Published literature suggests that MSCs do not differentiate into epithelial cells in the endometrium. Nuclear OCT-4 positive VSELs and cytoplasmic OCT-4, AXIN2 and KERATIN-19 positive epithelial progenitors have a greater role during endometrial regeneration. We propose, transplantation of MSCs simply provides growth factors/cytokines essential for the tissue-resident stem/progenitor cells to undergo differentiation into sperm, eggs and endometrial epithelial cells in the reproductive tissues.
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Acknowledgements
The authors acknowledge contributions of Seema Parte and Hiren Patel for their work on ovarian stem cells; Sreepoorna Unni, Sandhya Anand and Hiren Patel for their work on testicular stem cells and Pranesh Gunjal, Kreema James and Kavita Gala towards better understanding of uterine stem cells. Core support to the Department is provided by Indian Council of Medical Research, Government of India, New Delhi, India.
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Core support to the Department is provided by Indian Council of Medical Research, Government of India, New Delhi, India.
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This article belongs to the Topical Collection: Special Issue on Tissue-resident Stem/Progenitor Cells Endowed with Broader Germ Layer Specification Potential in Normal and Cancerous Tissues
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Bhartiya, D., Singh, P., Sharma, D. et al. Very small embryonic-like stem cells (VSELs) regenerate whereas mesenchymal stromal cells (MSCs) rejuvenate diseased reproductive tissues. Stem Cell Rev and Rep 18, 1718–1727 (2022). https://doi.org/10.1007/s12015-021-10243-6
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DOI: https://doi.org/10.1007/s12015-021-10243-6