VEGFA family isoforms regulate spermatogonial stem cell homeostasis in vivo

Kyle C. Caires, Jeanene M. De Avila, Andrea S. Cupp, Derek J. McLean

Research output: Contribution to journalArticle

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Abstract

The objective of the present study was to investigate vascular endothelial growth factor A (VEGFA) isoform regulation of cell fate decisions of spermatogonial stem cells (SSC) in vivo. The expression pattern and cell-specific distribution of VEGF isoforms, receptors, and coreceptors during testis development postnatal d 1-180 suggest a nonvascular function for VEGF regulation of early germ cell homeostasis. Populations of undifferentiated spermatogonia present shortly after birth were positive for VEGF receptor activation as demonstrated by immunohistochemical analysis. Thus, we hypothesized that proangiogenic isoforms of VEGF (VEGFA 164) stimulate SSC self-renewal, whereas antiangiogenic isoforms of VEGF (VEGFA 165b) induce differentiation of SSC. To test this hypothesis, we used transplantation to assay the stem cell activity of SSC obtained from neonatal mice treated daily from postnatal d 3-5 with 1) vehicle, 2) VEGFA 164, 3) VEGFA 165b, 4) IgG control, 5) anti-VEGFA 164, and 6) anti-VEGFA 165b. SSC transplantation analysis demonstrated that VEGFA 164 supports self-renewal, whereas VEGFA 165b stimulates differentiation of mouse SSC in vivo. Gene expression analysis of SSC-associated factors and morphometric analysis of germ cell populations confirmed the effects of treatment on modulating the biological activity of SSC. These findings indicate a nonvascular role for VEGF in testis development and suggest that a delicate balance between VEGFA 164 and VEGFA 165b isoforms orchestrates the cell fate decisions of SSC. Future in vivo and in vitro experimentation will focus on elucidating the mechanisms by which VEGFA isoforms regulate SSC homeostasis.

Original languageEnglish (US)
Pages (from-to)887-890
Number of pages4
JournalEndocrinology
Volume153
Issue number2
DOIs
StatePublished - Feb 1 2012

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Vascular Endothelial Growth Factor A
Protein Isoforms
Homeostasis
Stem Cells
Vascular Endothelial Growth Factor Receptor
Germ Cells
Testis
Colony-Forming Units Assay
Spermatogonia
Stem Cell Factor
Stem Cell Transplantation
Population
Statistical Factor Analysis
Immunoglobulin G
Transplantation

ASJC Scopus subject areas

  • Endocrinology

Cite this

VEGFA family isoforms regulate spermatogonial stem cell homeostasis in vivo. / Caires, Kyle C.; De Avila, Jeanene M.; Cupp, Andrea S.; McLean, Derek J.

In: Endocrinology, Vol. 153, No. 2, 01.02.2012, p. 887-890.

Research output: Contribution to journalArticle

Caires, Kyle C. ; De Avila, Jeanene M. ; Cupp, Andrea S. ; McLean, Derek J. / VEGFA family isoforms regulate spermatogonial stem cell homeostasis in vivo. In: Endocrinology. 2012 ; Vol. 153, No. 2. pp. 887-890.
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