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HIV expression in surgical specimens.

We determined the HIV-1 RNA and Gag p24 protein expression in gastrointestinal tract-associated lymphoid tissue (GALT), deep lymph nodes (LNs), and inflammatory lesions, acquired during surgery on HIV-infected patients. Surgically excised gastrointestinal tract specimens, LNs, and cervices removed from HIV-1-infected patients for various clinical conditions were studied by immunohistochemistry (IHC) for Gag p24 HIV protein and in situ hybridization (ISH) for HIV-specific RNA. Fragments of some specimens were also submitted in glutaraldehyde for TEM analysis. Germinal centers (GC) in the GALT had at least as much HIV RNA and p24 protein deposited on their follicular dendritic cell (FDC) networks as did GC in LNs draining or associated with areas of inflammation or ulceration. The level of viral expression in the deep LNs, e.g., mesenteric and retroperitoneal, was at least equivalent to that seen in superficial LNs, i.e., inguinal, axillary, and cervical, and tonsils and adenoids. HIV expressing T and B lymphocytes and macrophages were seen in GALT and LNs. Virus-expressing mononuclear cells (MNC) were also seen in inflammatory lesions such as gastrointestinal ulcers and acute appendicitis. Abundant virus was seen in the cervix of patients with and without cancer and in LNs of patients with metastatic cancer. Individual and clusters of mature HIV particles were identified by TEM in LN GC and in GALT. Gastrointestinal tract lymphoid tissue, inflammatory lesions, and deep LNs showed levels of HIV RNA and Gag p24 protein expression in the range seen in superficial LNs.