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Titolo:
Osteoblast fibronectin mRNA, protein synthesis, and matrix are unchanged after exposure to microgravity
Autore:
Hughes-Fulford, M; Gilbertson, V;
Indirizzi:
VetAAdm Med Ctr, Lab Cell Growth & Differentiat, San Francisco, CA 94121 US Vet Adm Med Ctr San Francisco CA USA 94121 at, San Francisco, CA 94121 US Univ Calif San Francisco, Med Ctr, San Francisco, CA 94121 USA Univ Calif San Francisco San Francisco CA USA 94121 ancisco, CA 94121 USA
Titolo Testata:
FASEB JOURNAL
, volume: 13, anno: 1999, supplemento:, S
pagine: S121 - S127
SICI:
0892-6638(1999)13:<S121:OFMPSA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
MESSENGER-RNA EXPRESSION; GENE-EXPRESSION; SHAPE CHANGES; CELL-SHAPE; DIFFERENTIATION; BONE;
Keywords:
growth activation; spaceflight; mRNA expression;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Hughes-Fulford, M Vet4121 Med Ctr, Lab Cell Growth 151F, 4150 Clement St, San Francisco, CA 9 Vet Adm Med Ctr 4150 Clement St San Francisco CA USA 94121
Citazione:
M. Hughes-Fulford e V. Gilbertson, "Osteoblast fibronectin mRNA, protein synthesis, and matrix are unchanged after exposure to microgravity", FASEB J, 13, 1999, pp. S121-S127

Abstract

The well-defined osteoblast line, MC3T3-E1 was used to examine fibronectin(FN) mRNA levels, protein synthesis, and extracellular FN matrix accumulation after growth activation in spaceflight. These osteoblasts produce FN extracellular matrix (ECM) known to regulate adhesion, differentiation, and function in adherent cells. Changes in bone ECM and osteoblast cell shape occur in spaceflight. To determine whether altered FN matrix is a factor in causing these changes in spaceflight, quiescent osteoblasts were launched into microgravity and were then sera activated with and without a 1-gravity field. Synthesis of FN mRNA, protein, and matrix were measured after activation in microgravity, FN mRNA synthesis is significantly reduced in microgravity (0-G) when compared to ground (GR) osteoblasts flown in a centrifuge simulating earth's gravity (1-G) field 2.5 h after activation. However, 27.5h after activation there were no significant differences in mRNA synthesis. A small but significant reduction of FN protein was found in the 0-G samples 2.5 h after activation. Total FN protein 27.5 h after activation showedno significant difference between any of the gravity conditions, however, there was a fourfold increase in absolute amount of protein synthesized during the incubation. Using immunofluorescence, we found no significant differences in the amount or in the orientation of the FN matrix after 27.5 h inmicrogravity, These results demonstrate that FN is made by sera-activated osteoblasts even during exposure to microgravity. These data also suggest that after a total period of 43 h of spaceflight FN transcription, translation, or altered matrix assembly is not responsible for the altered cell shape or altered matrix formation of osteoblasts.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/21 alle ore 01:08:38