ince the early 1980s, the HIV epidemic has been raging within the S 1
United States and around the world. Drug therapy for HIV infection has
not been curative, prompting the search for alternative strategies to
control HIV infection within infected persons. One potential alterna-
tive to drug therapy is a developing medical technology termed gene
therapy. 2 Gene therapy involves introducing genetic elements into popu-
lations of cells in order to correct or prevent a pathologic process. A
large number of gene therapy strategies have been developed in an at-
tempt to inhibit HIV expression and spread. These strategies fall into
two general categories, genetic modification of cells in order to elicit
an immune response against HIV and genetic modification of the target
cells of HIV infection in order to block HIV expression and
reproduction. In the first strategy, termed genetic immunotherapy by
some, genetic material encoding HIV proteins is introduced into
patient's cells in order to stimulate a cellular immune response above
and beyond 3 5 that stimulated by the viral infection itself. - Two
general genetic im- munotherapy strategies have been developed. Genes
encoding HIV pro- teins have been directly injected into the dermis or
muscle tissue of patients. These genes have been encoded in plasmids or
viral DNA and have been injected either in the form of naked DNA or
complexed with lipids.