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Altered cell-averaged microviscosity of murine peritoneal macrophages undergoing activation in vivo or in vitro.

Abstract：

:The cell-averaged microviscosity of intact murine peritoneal mononuclear phagocytes in various stages of activation was assessed by quantifying fluorescent depolarization of 1,6-diphenyl-1,3,5-hexatriene. Macrophages activated in vivo with Mycobacterium bovis, strain BCG, were significantly more fluid than resident peritoneal macrophages, responsive macrophages elicited with thioglycollate broth, proteose peptone broth, or fetal bovine serum, or primed macrophages elicited with pyran copolymer, MVE-2. Specifically, the cell-averaged microviscosity decreased from a mean of 3.47 +/- .07 eta 25 degrees C (poise) (range of 3.32 to 3.67 p) to 2.62 eta 25 degrees C. Exposure of responsive macrophages in vitro to bacterial endotoxin plus hybridoma supernatants containing macrophage-activating factor or purified recombinant interferon gamma resulted in decreased microviscosity; the largest effect was seen after 24 hr. Macrophages primed in vivo with MVE-2 and treated in vitro with endotoxin also developed decreased microviscosity. Similar changes in microviscosity were observed in a plasma membrane-enriched fraction isolated from macrophages activated in vitro with interferon gamma and endotoxin, thus suggesting that the cell-averaged measurements reflected changes in membrane viscosity. The optimum concentration of MAF-inducing decreased overall microviscosity was identical to that for inducing tumoricidal capacity. Taken together, the data indicate activation of lytic capacity in murine macrophages is closely associated with decreased cell-averaged microviscosity and that this change reflects, at least in part, decreased microviscosity of the plasma membrane of these cells.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Somers SD,Yuli I,Snyderman R,Adams DO

doi

10.1016/0008-8749(87)90026-8

subject

Has Abstract

pub_date

1987-02-01 00:00:00

pages

232-44

issue

2

eissn

0008-8749

issn

1090-2163

pii

0008-8749(87)90026-8

journal_volume

104

pub_type

杂志文章

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