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Growth and paracrine factors regulating follicular formation and cellular function
K P McNatty1, A E Fidler, J L Juengel
1AgResearch, Wallaceville Animal Research Centre, PO Box 40063, Centre Ward Street, Upper Hutt, New Zealand. mcnattyk@agresearch.cri.nz
Molecular and Cellular Endocrinology
|August 30, 2000
Summary
Fetal sheep ovaries develop follicles through mesonephric cell colonization and somatic cell-streams interacting with oocytes. Growth factors, particularly from the TGFbeta superfamily, are crucial for early ovarian development and follicular formation.
Area of Science:
- Reproductive biology
- Developmental biology
- Endocrinology
Background:
- Ovarian development involves complex cellular interactions and signaling pathways.
- Understanding early follicular formation is key to reproductive health.
Purpose of the Study:
- To review ovarian development and follicular formation in fetal sheep.
- To identify growth and paracrine factors involved in this process.
Main Methods:
- Utilized fetal sheep as an animal model.
- Examined mesonephric cell colonization and somatic cell-stream development.
- Analyzed expression of key steroidogenic factors (SF-1, StAR, 3beta-HSD, P450scc, P450aromatase).
- Identified growth factors and receptors in newly formed and growing follicles.
Main Results:
- Mesonephric cells colonize the fetal ovary, differentiating into follicular cells.
- Somatic 'cell-streams' expressing steroidogenic factors associate with oocytes to form primordial follicles.
- Follicles (Type 1 and 1a) form with 3-57 granulosa cells and oocytes (23-52 microm).
- Growth factors, notably from the TGFbeta superfamily, are expressed in a cell- and stage-specific manner.
Conclusions:
- Mesonephric cell-derived somatic cells are essential precursors for follicular cells.
- Specific growth factors regulate early ovarian follicular development in a precise manner.
- The fetal sheep model provides insights into conserved mechanisms of mammalian ovarian development.