Transforming growth factor-beta family members are regulated during induced luteolysis in cattle

Area of Science:

• Reproductive biology
• Endocrinology
• Molecular biology

Background:

• Transforming growth factors beta (TGFβ) are crucial local ovarian factors regulating follicular development and ovulation.
• The specific roles and regulation of TGFβ signaling during corpus luteum (CL) regression remain largely uncharacterized.

Purpose of the Study:

• To investigate the mRNA regulation of selected TGFβ family ligands and their receptors in the bovine CL during prostaglandin F2α (PGF)-induced luteolysis.
• To understand the temporal expression patterns of TGFβ signaling components during CL regression.

Main Methods:

• Bovine corpus luteum (CL) samples were collected at various time points (0, 2, 12, 24, 48 hours) after PGF administration on day 10 of the estrous cycle.
• Quantitative real-time PCR was used to measure the mRNA levels of specific TGFβ family genes, including activin receptors, AMH, BMPs, BMP receptors, inhibin subunits, and betaglycan.

Main Results:

• mRNA levels of BMP4, BMP6, and INHBA were significantly elevated at 2 hours post-PGF treatment.
• Upregulation of BMP1, BMP2, BMP3, BMP4, BMP6, ACVR1B, INHBA, and INHBB mRNA was observed up to 12 hours after PGF administration.
• A significant decrease in TGFBR3 mRNA abundance was noted at 48 hours post-PGF treatment.

Conclusions:

• The study demonstrates that genes encoding various TGFβ family members are expressed in a time-specific manner in the bovine CL following PGF-induced luteolysis.
• These findings highlight the dynamic involvement of TGFβ signaling in the complex process of CL regression.