How HIV-1 Enters Cells in the Vaginal Epithelium
Author Information
Author(s): Hladik Florian, Sakchalathorn Polachai, Ballweber Lamar, Lentz Gretchen, Fialkow Michael, Eschenbach David, McElrath M. Juliana
Primary Institution: Fred Hutchinson Cancer Research Center
Hypothesis
What are the initial events in the establishment of vaginal entry and infection by HIV-1?
Conclusion
HIV-1 efficiently enters both CD4+ T cells and Langerhans cells in the vaginal epithelium, but productive infection occurs primarily in CD4+ T cells.
Supporting Evidence
- HIV-1 entered CD4+ T cells almost exclusively by CD4 and CCR5 receptor-mediated direct fusion.
- HIV-1 entered CD1a+ Langerhans cells primarily by endocytosis.
- Productive infection was readily observed in CD4+ T cells but not in Langerhans cells.
Takeaway
When HIV-1 comes into contact with the vagina, it can quickly get inside special immune cells called CD4+ T cells and Langerhans cells, but it mostly makes copies of itself in the T cells.
Methodology
The study used an ex vivo human organ culture system to observe HIV-1 entry into vaginal epithelial cells.
Potential Biases
Potential bias in the interpretation of results due to the limited sample size and specific donor characteristics.
Limitations
The study could not definitively identify the infected cell type(s) in PCR assays due to low numbers of individual Langerhans cells.
Participant Demographics
Adult women undergoing vaginal repair surgeries.
Statistical Information
P-Value
p = 0.007
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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