Casein, actin, and tubulin expression during early involution in bovine and murine mammary tissue.
J Dairy Sci
; 75(7): 1857-69, 1992 Jul.
Article
em En
| MEDLINE
| ID: mdl-1500582
ABSTRACT
Hybridization methods and in vitro translation were used to examine the expression and functional condition of messenger RNA encoding caseins and cytoskeletal proteins in the mammary gland during early involution. In the mouse, steady state mRNA levels for alpha-, beta-, and gamma-caseins coordinately decreased to 20% of initial levels between 12 and 72 h after pup removal. In vitro translatability of mouse casein mRNA, as determined by immunoprecipitation, electrophoresis, and gel slice counting, revealed a pattern that closely paralleled mRNA expression. In contrast, bovine casein mRNA levels were only slightly reduced by 72 h postmilking, whereas in vitro translatability decreased by about one-half. Northern blot analysis of total mouse mammary RNA that were hybridized with probes to cytoskeletal proteins showed a gradual decrease of alpha-tubulin mRNA, but an increase in beta-actin mRNA during early involution. Two-dimensional gel analysis of in vitro translated products indicated a concordant increase in beta-gamma-actin. In the cow, beta-actin mRNA at 72 h of involution was equal to or greater than that during lactation. These results demonstrate the generally slower involution response in the cow and suggest that differing regulations are involved. Early events of cellular involution may be related to a reorganization of the cytoskeleton.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
RNA Mensageiro
/
Bovinos
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Regulação da Expressão Gênica
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Glândulas Mamárias Animais
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Proteínas do Leite
Limite:
Animals
Idioma:
En
Revista:
J Dairy Sci
Ano de publicação:
1992
Tipo de documento:
Article