Accumulation of exogenous 45Ca after middle cerebral artery occlusion in rats.

Abstract:

:The distribution of exogenous 45Ca in the focal ischemia rat model (middle cerebral artery occlusion) was studied using 45Ca autoradiography. High 45Ca accumulations were observed in the frontal cortex and caudate-putamen corresponding with morphological damage shown by HE staining. Regional 45Ca concentrations were calculated from the optical density on the 45Ca autoradiograms. Rapid uptake of 45Ca in the ischemic brain occurred during the first 5 hours, and continued more slowly between 5 and 24 hours after ischemia. The area of 45Ca accumulation was also expanded between 5 and 24 hours. An area of low 45Ca concentration around the area of high accumulation developed 5 hours after ischemia, which presumably accumulated 45Ca between 5 and 24 hours after ischemia. The lower concentration of 45Ca in the periphery of ischemia may result from: 1) a decrease in the total amount of calcium due to narrowing of extracellular space accompanied by cytotoxic edema, and 2) delayed accumulation of exogenous 45Ca due to reduced clearance of extracellular fluid.

authors

Tomabechi M,Sako K,Yonemasu Y

doi

10.2176/nmc.34.76

subject

Has Abstract

pub_date

1994-02-01 00:00:00

pages

76-80

issue

2

eissn

0470-8105

issn

1349-8029

pii

JST.Journalarchive/nmc1959/34.76

journal_volume

34

pub_type

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