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[D-Pen2,D-Pen5]enkephalin, a delta opioid agonist reduces endogenous aluminum content in the rat central nervous system.

Abstract：

:The in vivo effects of [D-Pen2,D-Pen5]enkephalin, a cyclic peptide agonist with high affinity and selectivity for the delta opioid receptors, on the endogenous aluminum content of selected areas of rat brain and spinal cord were studied by means of atomic absorption spectrophotometry. Intracerebroventricular injection of a subanalgesic dose of [D-Pen2,D-Pen5]enkephalin (0.2 microgram/3 microliters) produced a transient, time-dependent reduction of the aluminum content. This effect was statistically significant in the frontal cortex, hippocampus and striatum, but did not reach the level of significance in the medulla and thoracic spinal cord. The partial depleting effect of [D-Pen2,D-Pen5]enkephalin on aluminum content, in the range of 0.2-1.0 micrograms/3 microliters, was dose-dependent and could be reversed by naloxone pretreatment. Serum aluminum levels were unchanged after [D-Pen2,D-Pen5]enkephalin treatment. Chronic (five weeks), systemic AlCl3 treatment increased the endogenous aluminum content in all central nervous system areas examined. Interestingly, [D-Pen2,D-Pen5]enkephalin i.c.v. produced a slight depletion of this elevated metal level in these areas to values not significantly different from those of the respective control values. Chronic in vivo, as well as in vitro, effects of aluminum on opioid receptor binding characteristics were also studied. Neither the specific binding of [3H][D-Pen2,D-Pen5]enkephalin nor [3H]Tyr-D-Ala-Gly-NMePhe-Gly-ol to membranes of frontal or parietal cortices, striatum or hippocampus, prepared from rats chronically treated with AlCl3, were affected.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Neuroscience

journal_title

Neuroscience

authors

Gulya K,Szikra J,Kása P

doi

10.1016/0306-4522(94)00575-p

subject

Has Abstract

pub_date

1995-05-01 00:00:00

pages

499-506

issue

2

eissn

0306-4522

issn

1873-7544

pii

0306-4522(94)00575-P

journal_volume

66

pub_type

杂志文章

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