Chang SY, Tsai MY, Huang FJ, Kung FT. Expression of insulin-like growth factor (IGF),
IGF receptor, and IGF-binding protein messenger ribonucleic acids in luteinized granulosa cells from different size follicles after controlled ovarian hyperstimulation.
J Assist Reprod Genet 2002;
19:121-6. [PMID:
12005306 PMCID:
PMC3468256 DOI:
10.1023/a:1014732704218]
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Abstract
PURPOSE
This study was conducted to determine the gene expression of insulin-like growth factors (IGFs), their receptors, and binding proteins (IGFBPs) in human luteinized granulosa cells collected during ovum retrieval.
METHODS
cDNA probes were used to analyze the gene expression of IGF-I, IGF-II, IGF type 1 receptor (IGFR-1), IGF type 2 receptor (IGFR-2), and IGFBP-1 to -6 in luteinized granulosa cells.
RESULTS
The levels of IGFBP-5 transcripts of the luteinized granulosa cells increased with increasing follicular fluid (FF) volume when follicles were grouped into 3 volume catagories of < or = 1.5 mL: > 1.5 mL but < or = 4.5 mL; and > 4.5 mL (0.28 +/- 0.64 vs. 0.41 +/- 0.76 vs. 0.46 +/- 0.92, p = 0.037).
CONCLUSIONS
The increased levels of IGFBP-5 transcripts in luteinized granulosa cells found with increased follicular fluid volume after COH may favor a shift toward diminished action of IGFs in larger follicles immediately prior to ovulation.
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