CCR5 as a Coreceptor for Human Immunodeficiency Virus and Simian Immunodeficiency Viruses: A Prototypic Love-Hate Affair.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic and evolutionary biological literature without original empirical data or systematic methodology.
PubMed 35154162 · doi:10.3389/fimmu.2022.835994
What was done
This narrative review synthesizes literature regarding the role of the chemokine receptor CCR5 as an entry coreceptor for human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV). It examines natural resistance mechanisms in humans and over 40 African non-human primate species, as well as therapeutic strategies developed from these biological mechanisms.
What was found
The abstract provides no quantitative metrics or statistical values. It details several qualitative biological mechanisms: - Homozygous carriage of the human CCR5-Δ32 loss-of-function mutation abrogates cell-surface expression and confers resistance to HIV-1 infection. - Natural SIV hosts avoid disease progression through CCR5-modulating adaptations, including deletion mutations, downregulation of CCR5 expression on mucosal and memory CD4+ T cells, and delayed ontogenetic onset of CCR5 expression on CD4+ T cells to reduce vertical transmission. - SIV evolved to utilize alternative coreceptors on distinct CD4+ T-cell subpopulations, allowing viral replication without compromising host immune homeostasis.
Why it matters
Comparative biological mechanisms of CCR5 modulation in natural hosts directly inform clinical HIV strategies, such as pharmacological coreceptor blockade and gene editing or silencing targeting CCR5.
Limits
The abstract is a qualitative summary of evolutionary and mechanistic concepts; it contains no original empirical data, systematic search criteria, or pooled effect estimates. The broader clinical consequences and safety trade-offs of disrupting the pleiotropic functions of CCR5 across non-infectious conditions are noted conceptually rather than quantitatively analyzed.
Cited by
- supports Naturally occurring mutations in the CCR5 gene confer resistance to HIV infection.