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The exposure to human immunodeficiency virus type 1 (HIV-1) does not always result in infection. Indeed, there are individuals who have been repeatedly exposed to HIV-1 but do not exhibit clinical or serological evidence of infection; they are known as HIV-exposed seronegative individuals (HESN). To determine if secretory leukocyte protease inhibitor (SLPI), a soluble factor secreted by epithelial cells lining mucosal surfaces that showed anti-HIV activity in vitro, was associated with natural resistance to HIV infection, we measured by real time RT-PCR the expression of SLPI in oral mucosa of a cohort of Colombian HESN, in chronically HIV-1-infected individuals and in healthy controls. The HESN expressed significantly higher levels of SLPI mRNA than healthy controls (p=0.033) and chronically infected subjects (p=0.011). These findings suggest an association between SLPI expression and the natural resistance to HIV-1 infection exhibited by our HESN cohort.

aids research and human retroviruses

Short Communication: Increased Expression of Secretory Leukocyte Protease Inhibitor in Oral Mucosa of Colombian HIV Type 1-Exposed Seronegative Individuals