2012 ©
             Publication
Journal Publication
Research Title Associations of the bovine follicular health, mitotic activity and intrafollicular amounts of IGFBP-4 on 5 or 6 of the first follicular wave 
Date of Distribution 7 August 2010 
Conference
     Title of the Conference 8th International Ruminant Reproduction Symposium 
     Organiser Society of Reproduction in Domestic Ruminants 
     Conference Place Hilton Hotel 
     Province/State Anchorage 
     Conference Date 3 August 2010 
     To 7 August 2010 
Proceeding Paper
     Volume 2010 
     Issue 67 
     Page 123 
     Editors/edition/publisher Nottingham University Press 
     Abstract Insulin-like growth factor (IGF)-I and IGF binding proteins (IGFBPs) have been found to play a crucial role in the selection of bovine dominant follicles. Dominant follicles are characterized by greater mitotic activity and lower amounts of IGFBP-4 whereas atretic follicles are characterized by apoptosis of granulosa cells. No associations have yet been made, however, between mitotic activity, follicular health and intrafollicular amounts of IGFBP-4. The aim of the study, therefore, was to investigate the interactions of mitotic activity, follicular health and intrafollicular of IGFBP-4. Eight mature Thai native crossbred beef cows (60±7 mo of age; 461±14 kg BW) received two injections (11 d apart) of a PGF2a analogue (Estrumate®) to synchronize estrus. Ovaries were collected from a slaughterhouse on d 5 or 6 of the subsequent estrous cycle. Surface diameter of all follicles > 3 mm was determined. Follicular fluid was gently aspirated and stored at -20°C until determination of protein and IGFBP-4 by Bradford and Western blot analysis as previously described1. Follicular health was determined morphologically and classified as previously described2. Mitotic activity of granulosa and theca cells was evaluated by immmunohistochemistry using a monoclonal PCNA antibody (Cell Signaling Technology, CA, USA). The labeling index was calculated as the number of PCNA labeled nuclei expressed as percentage of total nuclei3. A total of 19 healthy and 10 unhealthy follicles were analyzed. Follicular diameters in healthy follicles were smaller than unhealthy follicles (6.9±0.7 vs. 9.6±1.5 mm; P<0.01). Regardless of follicular health, labeling index (%) of granulosa and theca cells were greatest (34.0±3.5 and 29.2±2.3; P<0.05) in small follicles (3 to 6 mm) compared with large follicles (>10 mm; 22.1±2.9 and 19.4±3.3) but were not different when compared with medium size follicles (7 to 10 mm; 31.7±3.9 and 26.4±3.0). Intrafollicular amounts of IGFBP-4 quantitated by densitometry were expressed arbitrarily in units. Follicular fluid amounts of IGFBP-4 were less (P<0.05) in healthy follicles regardless of follicular size. The interaction of mitotic activity and intrafollicular amounts of IGFBP-4 may play significant roles in follicular growth and atresia. 
Author
517030009-9 Mr. TOSSAPOL MOONMANEE [Main Author]
Agriculture Doctoral Degree

Peer Review Status มีผู้ประเมินอิสระ 
Level of Conference นานาชาติ 
Type of Proceeding Abstract 
Type of Presentation Oral 
Part of thesis true 
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