Transfer pathways between the ovaries and the uterus in the cebus monkeys (Cebus apella).

Abstract:

:The aim of this work was to study, in the Cebus apella monkey, the developmental changes in the microanatomy of the utero-ovarian ligament (UOL) and whether their vascular and neural elements might be involved in the transfer of signals between the ovaries and uterus. Sections including uterus, UOL, and ovary obtained from two foetuses, two prepubertal, and four cycling monkeys, two of them treated with a neuron-axonal tracer, diamidino yellow (DY) into the corpus luteum (CL) and the remaining two into the endometrium, were analyzed for the expression of neurofilament protein (NFP) and tracer distribution. Eight regularly cycling females were used to investigate the transfer to the CL of pulses of prostaglandin F(2alpha) (PGF(2alpha)) (n=4) or its vehicle (n=4) given intra-uterus. A convoluted artery, in conjunction with various vein channels, passed over the UOL allowing for a direct communication between uterus and ovaries. The artery acquired prominence during adulthood, in a manner well suited with the ovarian status. Immunohistochemical analysis revealed that NFP expression by the oocyte and by the endometrial epithelial cells was a highly conserved feature during development, whereas the appearance of NFP fibers in the ovaries, UOL, and uterus was a late event in the ontogenesis, likely regulated by the hormonal environment. Neurons, as an obvious source for these NFP fibers, were not recognized at any developmental stage, although some neuron-like cells were observed within the CL. The pattern displayed by the tracer DY, further suggested a reciprocal axonal transport among endometrial cells and follicular and luteal cells of both ovaries and between the ovaries themselves. The functionality of the utero-ovarian connection was assessed after injecting PGF(2alpha) intra-uterus. A short exposition to PGF(2alpha) pulses was required for lowering ovarian and peripheral progesterone concentrations causing luteolysis, indicating that transport mechanism operating between uterus and ovary must be very efficient. The results suggest that the vessels and axons contained in the UOL of the Capuchin monkeys might be two combined key pathways underlying the reciprocal transfer of signals controlling utero-ovarian homeostasis.

journal_name

Gen Comp Endocrinol

authors

Nagle CA,Mendizábal AF,Lahoz MM,Porta MM,Torres MI

doi

10.1016/j.ygcen.2005.06.006

keywords:

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

248-56

issue

3

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(05)00182-6

journal_volume

144

pub_type

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