Impact of uremia on female reproductive cyclicity, ovulation, and luteinizing hormone in the rat.

Abstract:

BACKGROUND:Impaired reproductive function accompanies chronic renal insufficiency (uremia) in both the human and experimental animal. Clinical hypogonadism occurs in both genders. The present studies were designed to investigate possible anti-ovulatory effects of uremia in the female rat, a species that produces multiple ova during the normal estrous cycle. METHODS:Renal insufficiency (uremia) was induced by 5/6 nephrectomy. Two control groups comprised sham-operated animals fed ad libitum (sham) or pair-wise with the uremic animals (pair-fed). Estrous cycles were determined by cytology of vaginal lavage. We examined concomitant changes in the preovulatory luteinizing hormone (LH) surge by radioimmunoassay (RIA), immunoradiometric assay (IRMA), and bioassay. Repetitive LH measurements were made from blood samples taken by intra-atrial catheter throughout the afternoon and evening of proestrus. The following morning (estrus), ovaries were collected, and ova were enumerated per oviduct. RESULTS:Experimentally uremic animals manifested a threefold elevation of plasma creatinine and urea nitrogen and concomitantly a more than 50% impoverishment of ova production. Analyses of a large group of animals (N = 83) by RIA revealed uremia-associated attenuation of the preovulatory LH surge. Further measurements of the preovulatory LH surge by independent IRMA and LH bioassay (N = 26) corroborated this attenuation. Additional experiments indicated that these hormonal changes, but not changes in ovulation, might further reflect modulation of LH release by the anesthesia used in the preparative nephrectomy and catheterization surgeries. When normalized to body weight, the ovaries of uremic rats were found to weigh more than those of either the sham or pair-fed animals. CONCLUSIONS:The present experiments take advantage of an experimental uremic model to document a consistent decrease in the number of ova released during estrus in the uremic animal. Possible disruption of hypothalamic-pituitary-ovarian regulation is further highlighted by attenuation in the preovulatory LH surge. These results provide a basis for further studies of neuroendocrine pathophysiology in a rodent model of uremia-associated ovulatory disruption.

journal_name

Kidney Int

journal_title

Kidney international

authors

Krieg RJ,Tokieda K,Chan JC,Veldhuis JD

doi

10.1046/j.1523-1755.2000.00203.x

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

569-74

issue

2

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)47137-6

journal_volume

58

pub_type

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