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Transcription profile of the insulin-like growth factor signaling pathway during human ovarian follicular development.

Abstract：

PURPOSE:The IGF signaling cascade exerts important regulatory functions in human ovarian folliculogenesis. The scope of this study was to evaluate the transcription profile of insulin-like growth factor (IGF) genes during human ovarian follicle development and to analyze follicle fluid levels of key IGF proteins. METHODS:Gene expression profiling was performed with microarray gene analysis. The analysis was assessed from ovarian follicles and granulosa cells (GCs) obtained from isolated stage-specific human ovarian follicles, including preantral follicles, small antral follicles, and preovulatory follicles. Numerous genes involved in the IGF signaling pathway was evaluated and key genes were validated by qPCR from GCs. Protein levels of various IGF components of human follicular fluid (FF) were measured by ELISA and time-resolved immunofluorometric assays (TRIFMA). RESULTS:The gene expression levels of PAPPA, IGF2, IGF receptors and intracellular IGF-activated genes increased with increasing follicle size. This was especially prominent in the late preovulatory stage where IGF2 expression peaked. Protein levels of intact IGF binding protein-4 decreased significantly in FF from large preovulatory follicles compared with small antral follicles concomitant with higher protein levels of PAPP-A. The IGF modulators IGF-2 receptor, IGFBPs, stanniocalcins, and IGF-2 mRNA binding proteins were all observed to be expressed in the different follicle stages. CONCLUSIONS:This study confirms and highlights the importance of PAPP-A regulating bioactive IGF levels throughout folliculogenesis and especially for the high rate of granulosa cell proliferation and expression of key ovarian hormones important in the last part of the follicular phase of the menstrual cycle.

journal_name

J Assist Reprod Genet

journal_title

Journal of assisted reproduction and genetics

authors

Bøtkjær JA,Pors SE,Petersen TS,Kristensen SG,Jeppesen JV,Oxvig C,Andersen CY

doi

10.1007/s10815-019-01432-x

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

889-903

issue

5

eissn

1058-0468

issn

1573-7330

pii

10.1007/s10815-019-01432-x

journal_volume

36

pub_type

杂志文章

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