Characterization of zinc-induced neuronal death in primary cultures of rat cerebellar granule cells.

Abstract:

:Although zinc is essential for the activity of numerous biological systems, and zinc deficiency has been associated with various pathologies, this metal can also exert direct neurotoxic action. In primary cultures of rat cerebellar granule neurons, a brief, 15- to 30-min exposure to zinc (100-500 microM) resulted in concentration-dependent delayed neuronal death. The toxicity of zinc depended on the maturity of the neuronal cultures-it was not apparent prior to Day 5 and it reached a plateau at about 9-10 days in vitro. We assayed cell injury by measuring mitochondrial functioning (MTT assay) and cell death with the trypan blue exclusion assay. Apoptosis was assayed by the morphological appearance of cells following fluorescence staining with propidium iodide and by the in situ TUNEL technique. Mitochondrial injury was an early result of zinc treatment. Actinomycin D, an inhibitor of macromolecular synthesis, attenuated delayed cell death. The calcium channel blockers nimodipine and amlodipine reduced both mitochondrial injury and cell death; the blockade of ionotropic glutamate receptors with MK-801 or CNQX was ineffective. These results suggest that calcium channel-blocker-sensitive mitochondrial injury and DNA damage are operative in the protein-synthesis-dependent neurotoxicity of zinc. An imbalance of zinc homeostasis might play a role in the pathophysiology of apoptosis-associated neurodegenerative disorders.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Manev H,Kharlamov E,Uz T,Mason RP,Cagnoli CM

doi

10.1006/exnr.1997.6510

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

171-8

issue

1

eissn

0014-4886

issn

1090-2430

pii

S0014-4886(97)96510-9

journal_volume

146

pub_type

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