CD4 and HIV

Stephen Hall shall at
Fri Feb 3 21:52:15 EST 1995

In article <3gs88r$hrd at>, rbbatchu at wrote:

> In article <1995Jan28.170235.1 at>, camplte1 at
> >Can anybody out there tell me what, if any, research has been done
> >using CD4 as a cure or attempted cure for AIDS.
> >
> >Thank you.
> >
> >Please send any information by E-mail.
> >
> >Troy Camplin
> >camplte1 at
> Please refer to the following
> Morgan, R. A. et al. (1990) AIDS Res. Hum. Retrovir. 6, 183-191.
> Using a soluble form of the CD4, gene therapy cure for HIV is being 
> persued in many laboratories.  

That type of blocking experiment with soluble CD4 has some success in in 
vitro studies, but simply does not work well in clinical trials.  The lab 
isolates of HIV behave quite differently from the more complex primary
isolates.  Also, CD4 functions not only as the HIV receptor, but primarily

as a heterophilic cell adhesion molecule.  Exogenous soluble CD4 causes
numerous problems.

Some citations regarding other problems involving gene therapy with CD4:

-HIV has been shown to down regulate MHC molecules and/or alter expression
of CAMs. 

Schrier et al. (1983) Nature 305: 771-775, Signas et al. (1982)
Nature 299: 175-178.

-Transfusing with CD4+ peripheral blood lymphocytes causes no positive 
effect on cells such as dendritic and central nervous system cells. 
Mitogenic activation required for transduction could increase HIV
infection. Other issues regarding treating AIDS with gene therapy are
discussed.  A good review. 

Gilboa and Smith (1994) Trends in Genetics 10: 139-144.

Stephen Hall
Executive Committee
Purdue University Neuroscience Program
Purdue University
West Lafayette, IN 47907-1392

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