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Cell Growth & Differentiation, Vol 6, Issue 2 131-137, Copyright © 1995 by American Association of Cancer Research


ARTICLES

p53-independent apoptotic and necrotic cell deaths induced by adenovirus infection: suppression by E1B 19K and Bcl-2 proteins

T Subramanian, B Tarodi and G Chinnadurai
Institute for Molecular Virology, St. Louis University Medical Center, Missouri 63110, USA.

Adenovirus E1B 19K protein prevents premature death of adenovirus-infected cells. Viral mutants (19K mutants) defective in the 19K protein induce enhanced cell death, resulting in fragmentation of viral and cellular DNA. The 19K protein can also suppress the effects of certain external cell death-inducing stimuli, such as tumor necrosis factor alpha and various DNA-damaging agents that induce apoptosis. We have examined viral infection of permissive human cells and nonpermissive rat cells to determine if the 19K mutant induces apoptotic or necrotic type of cell death. Infection of normal rat kidney cells with an adenovirus type 2 19K deletion mutant induces internucleosomal DNA fragmentation and condensation of nuclear chromatin. Electron microscopic examination of these cells revealed the presence of condensed subnuclear bodies characteristic of apoptosis. In contrast, infection of human A549 cells induces random DNA fragmentation, and these cells do not exhibit characteristic condensation of the nuclear chromatin but contain enlarged nuclei loaded with virus particles. Therefore, it appears that adenovirus infection induces both apoptotic and necrotic types of cell death, depending on the cell type. Both types of cell death can be suppressed by E1B 19K protein. Similarly, a recombinant adenovirus expressing the human Bcl-2 protein but lacking the E1B proteins can efficiently suppress both apoptotic and necrotic cell death induced by adenovirus infection. The requirement of p53 tumor suppressor protein in adenovirus-induced cell death was investigated by infection of human Saos2 and mouse p53 nullizygous (p53-/-) cells lacking p53 tumor suppressor protein.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1995 by the American Association of Cancer Research.