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Cold‐stress response in the amphibian oocyte: changes in synthesis and nucleocytoplasmic distribution of some proteins
Author(s) -
Moreau Nicole,
Lautredou Nicole,
N'Da Éléonore,
Angelier Nicole
Publication year - 1991
Publication title -
biology of the cell
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 85
eISSN - 1768-322X
pISSN - 0248-4900
DOI - 10.1016/0248-4900(91)90056-s
Subject(s) - pleurodeles , biology , cytoplasm , oocyte , nucleus , microbiology and biotechnology , actin , biochemistry , protein biosynthesis , amphibian , embryo , ecology
Summary— In vivo cold stress was found to induce characteristic changes in the protein synthesis pattern of Pleurodeles waltl oocytes, as analyzed by two‐dimensional gel electrophoresis. The nature of the response varied with the duration and intensity of stress. After a short period of cold stress (12 h at 8°C), synthesis and intracellular distribution of polypeptides were dramatically disturbed. There occured: 1) a reduction in synthesis of several polypeptides, including two major polypeptides (54‐kDa and 47‐kDa); 2) changes in distribution of polypeptides in oocyte, ie some polypeptides (185‐ and 96‐kDa) were blocked in the cytoplasm, while other polypeptides (82‐, 74‐, 72‐ and 68‐kDa, actin and nucleoplasmin) continued to enter the nucleus, but were quantitatively reduced; 3) no changes in the distribution of two nuclear polypeptides (53‐ and 43‐kDa); 4) changes in the relative quantities of β‐ and γ‐actin and preferential migration of γ‐actin towards the nucleus. After a long period of in vivo cold stress (5 days at 8°C), we noted a partial recuperation of synthesis and nuclear migration (except for a 96‐kDa polypeptide), but a persistent perturbation at the level of actin. For more drastic stress conditions (4°C), such a recuperation of protein synthesis was never observed.