Aged and post-mitotic cells share a very stable higher-order structure in the cell nucleus in vivo

作者：Alva Medina Janeth; Dent Myrna A R; Aranda Anzaldo Armando^*

来源：Biogerontology, 2010, 11(6): 703-716.

DOI：10.1007/s10522-010-9285-4

• DNA loops
• Hepatocytes
• Neurons
• Nuclear matrix
• Replicative senescence
• Tensegrity

In the mammalian liver the quiescent primary hepatocytes preserve a proliferating potential in vivo, yet natural aging correlates with loss of proliferating potential and progression towards terminal differentiation of the hepatocytes. Thus aged, terminally-differentiated hepatocytes may survive in a de facto post-mitotic state, similarly to early post-mitotic cells, like neurons, suggesting that there might be a common factor linking both cellular states. In the interphase of metazoan cells the nuclear DNA is organized in supercoiled loops anchored to a protein-aceous substructure known as the nuclear matrix (NM). The DNA-NM interactions define a higher-order structure in the cell nucleus (NHOS). Natural aging of the rat liver correlates with a progressive strengthening of the NM framework and the stabilization of the DNA-NM interactions in the hepatocytes indicating that the NHOS becomes highly stable with age. We compared the NHOS of post-mitotic rat neurons with that of aged rat hepatocytes. Our results indicate that a very stable NHOS is a common feature of both aged and post-mitotic cells in vivo.

• 出版日期2010-12