Nuclear lamina assembly in the first cell cycle of rat liver regeneration.

Abstract:

:The nuclear lamina is a fibrous structure at the nucleoplasmic surface of the inner nuclear membrane. Its assembly state is regulated by phosphorylation of its protein components, the lamins A, B, and C. The isoprenylation of the lamins is essential for their proper membrane anchoring and functionality. The content and the membrane association of nuclear lamins and the subcellular localization at light and electron microscopical levels were studied at different times of rat liver regeneration. This model for the good synchrony of the first cell cycle is particularly suited for the study of cell-cycle-dependent modifications and is particularly interesting for the increased protein prenylation found in S phase. The biochemical results show an increased lamin content in nuclear proteins in G1 phase and a decreased content in M phase, along with an enhanced cytosolic localization of A and C lamins at later stages. The morphological results show in M phase, also in nondividing cells, a decreased lamin-like immunoreactivity around the nucleus with an apparent nuclear lamina disassembly. These data emphasize the dynamic organization of nuclear lamina not only in mitosis but also in interphase. The reduction and partial solubilization of nuclear lamina in M phase suggest a reorganization of the nuclear envelope also in those cells that do not appear in mitosis but have replicated their DNA content that will result in a higher degree of polyploidy.

journal_name

J Cell Physiol

authors

Bruscalupi G,Di Croce L,Lamartina S,Zaccaria ML,Luzzatto AC,Trentalance A

doi

10.1002/(SICI)1097-4652(199705)171:2<135::AID-JCP3

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

135-42

issue

2

eissn

0021-9541

issn

1097-4652

pii

10.1002/(SICI)1097-4652(199705)171:2<135::AID-JCP3

journal_volume

171

pub_type

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