Title
Caprine ovarian follicle requirements differ between preantral and early antral stages after IVC in medium supplemented with GH and VEGF alone or in combination
Date Issued
01 January 2017
Access level
open access
Resource Type
journal article
Author(s)
Cadenas J.
Vieira L.A.
Apolloni L.B.
Aguiar F.L.N.
Alves B.G.
Lobo C.H.
Rodrigues A.P.R.
Apgar G.A.
Smitz J.
Figueiredo J.R.
Maside C.
State University of Ceará
Publisher(s)
Elsevier Inc.
Abstract
The aim of the present study was to evaluate the effect of growth hormone (GH) and vascular endothelial growth factor (VEGF) added alone, sequentially or in combination, in the presence of insulin at physiological concentration (10 ng/mL) on the IVC of two different follicular categories: preantral (experiment 1; Exp.1) and early antral (experiment 2; Exp.2). Isolated follicles were individually cultured for 24 (Exp.1) and 18 days (Exp.2) in the following treatments: αMEM+ (Control), or Control medium supplemented with 50 ng/mL GH (GH), 100 ng/mL VEGF (VEGF), the combination of both (GH + VEGF), GH during the first 12 days and VEGF from Day 12 until the end of the culture (GH/VEGF) and vice versa (VEGF/GH). At the end of the culture, cumulus-oocyte complexes from in vitro–grown follicles were recovered and subjected to IVM. The following end points were evaluated: Follicle morphology, growth rates and antrum formation, production of estradiol, progesterone and testosterone, oocyte viability and meiotic stage, as well as relative expression of LHR, Amh, HAS2, PTGS2, CYP17, CYP19A1, and 3βHSD. A considerable amount of viable fully grown oocytes were recovered after the IVC of early antral follicles in all treatments. Nevertheless, the GH treatment presented the highest percentage of fully grown oocytes (60%), mean oocyte diameter (117.74 ± 2.61 μm), and meiotic resumption (50%). Furthermore, GH treatment produced higher (P < 0.05) rates of metaphase II oocytes than all the other treatments, and similar LHR, Amh, and PTGS2 transcript levels to in vivo. Contrary to early antral follicles, preantral follicles were not affected by medium supplementation. In conclusion, the addition of GH to a culture medium containing physiological concentrations of insulin improves oocyte growth and maturation after the IVC of goat early antral follicles.
Start page
321
End page
332
Volume
87
Language
English
OCDE Knowledge area
Ciencia veterinaria
Biología reproductiva
Subjects
Scopus EID
2-s2.0-84992200191
PubMed ID
Source
Theriogenology
ISSN of the container
0093691X
Sponsor(s)
This research was supported by grants from the National Council for Scientific and Technological Development (CNPq-79/2013 linha 3—Rede Nordeste de Biotecnologia [Rede de pesquisa do ovário artificial]—Processo No 407594/2013-2 ). J. Cadenas is the recipient of a grant from FUNCAP/CE (Brazil). The authors thank Dr. Johan Smitz for contribution in hormonal assay and Dr. Gary A. Apgar for assistance in manuscript preparation.
Sources of information:
Directorio de Producción Científica
Scopus