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Age-related activation of microglia and astrocytes: in vitro studies show persistent phenotypes of aging, increased proliferation, and resistance to down-regulation.

Abstract：

:Astrocytes and microglia from cerebral cortex of 3-, 6-, 12-, and 24-month-old F344 male rat donors showed progressively greater proliferation during primary culture. Microglia from aging donor brains exhibited an amoeboid-like morphology and express antigens characteristic of an activated state (e.g., major histocompatibility complex class II). Moreover, microglia from aging donors were less sensitive to several types of regulators. Granulocyte-macrophage colony stimulating factor stimulated proliferation in microglia from young, but not aging brains. Transforming growth factor (TGF)-beta1 inhibited astrocytic and microglial proliferation in cultures from young, but not aging donors. Similarly, the inhibition of lipopolysaccharide-induced NO production by TGF-beta1 in microglia was impaired in cultures from 12-month (middle-age) brains. Another aging change detected by middle age, increased glial fibrillary acidic protein (GFAP) expression, also persisted in astrocytes from 12- to 24-month-old brains, as evaluated by increased activity of a 5'-upstream GFAP promoter construct. Thus, both microglia and astrocytes originated from aging cerebral cortex maintain in vitro at least some of the activated phenotypes of aging glia that are observed in vivo. This new in vitro cell model may allow efficient analysis of glial age changes.

journal_name

Neurobiol Aging

journal_title

Neurobiology of aging

authors

Rozovsky I,Finch CE,Morgan TE

doi

10.1016/s0197-4580(97)00169-3

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

97-103

issue

1

eissn

0197-4580

issn

1558-1497

pii

S0197-4580(97)00169-3

journal_volume

19

pub_type

杂志文章

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