Placental glycogen metabolism changes during walker tumour growth.

Abstract:

:The placenta provides all energy and nutrient requirements for healthy fetal development. The placenta in rats is capable of storing glycogen, although the placenta cells must therefore mobilize stored glycogen to its own glucose supply. Moreover, maternal glucose and/or placental lactate furnished the fetal growth. Adult female Wistar rats were divided into three groups: Control-C, tumour bearing-W; injected ascitic fluid-A. The rats were sacrificed on the 16th, 19th or 21st day of gestation, analysing the placenta and fetus weights and placental tissue samples was aliquoted for biochemical assays of glycogen and protein content and alkaline phosphatase activity. Placental sections were morphometrically analysed and glycogen positive cells were counted. The placental and fetal weight were significantly reduced in both W and A rats from 16th up to 21st day of gestation, which showed high levels of fetal reabsorption sites. Significant reduction in labyrinth zone at day 21 in both tumour bearing and ascitic fluid injected groups was shown, suggesting less substrate exchange at the maternal/fetal surface. The alkaline phosphatase activity as well total protein content were found to be reduced in W and A group. The total placental glycogen and glycogen cells decreased during tumour bearing and ascitic fluid injection, suggesting reduction in its own stored energy. Ascitic fluid injected group, representing an indirect tumour effect, presented similar reduction changes in the placenta to the tumour-bearing group. In conclusion, the tumour growth and, especially, ascitic fluid injection promoted irreversible placental tissue damage altering homeostasis and compromising fetal development.

journal_name

Placenta

journal_title

Placenta

authors

Toledo MT,Gomes Marcondes MC

doi

10.1016/j.placenta.2003.11.005

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

456-62

issue

5

eissn

0143-4004

issn

1532-3102

pii

S0143400403003047

journal_volume

25

pub_type

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