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Mech Ageing Dev. 2003 Apr;124(4):361-9.

Effects of aging on proliferation and E47 transcription factor activity induced by different stimuli in murine splenic B cells.

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Department of Microbiology and Immunology, University of Miami School of Medicine, RMSB, #3146A, 1600 N.W. 10th Ave, Miami, FL 33136, USA.


In the present paper, we have investigated the effects of aging on the expression and function of the E2A-encoded transcription factor E47 in splenic B lymphocytes, unactivated or activated with different stimuli (LPS, anti-CD40, anti-IgM, alone or in combination with IL-4). Results indicate that unstimulated splenic B cells show very low E47 protein levels as well as E47 DNA-binding activity and that, upon B cell activation, E47 expression and DNA-binding activity are strongly induced in young and, to a significantly lesser extent, in old mice. The level of E47 protein expression in stimulated splenic B cells was found significantly higher in young than in old mice, suggesting that DNA-binding activity correlates with protein expression. These results altogether suggest that the reduced expression of the transcriptional regulator E47 could help explain the reduced B cell functions in aging mice.

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