Calcium-mediated neuronal degeneration following singlet oxygen production.

Abstract:

:NONINVASIVE photolytic injury to targeted neuronal subpopulations in vivo causes unique, slowly progressive neuronal degeneration. To examine the mechanisms of degeneration toward development and transplantation studies, cytosolic calcium levels were measured in vitro from neocortical neurons after incorporation of photoactive nanospheres and laser-activated singlet oxygen production within lysosomes. Cytosolic calcium increased irreversibly, predominantly from extracellular sources through channel-mediated mechanisms and increased membrane porosity. Propidium iodide studies demonstrated gradual loss of membrane integrity over hours to days. The calcium channel blocker nimodipine, or calcium-free medium, partially protected neurons from calcium flux and cell death. Results suggest calcium-dependent and independent mechanisms of neuronal degeneration following singlet oxygen production.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Sheen VL,Dreyer EB,Macklis JD

doi

10.1097/00001756-199208000-00014

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

705-8

issue

8

eissn

0959-4965

issn

1473-558X

journal_volume

3

pub_type

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