CCR5, or C-C chemokine receptor type 5, is a protein that plays a role in the immune system, particularly in inflammation and the migration of white blood cells. It's also known to be a co-receptor for HIV entry into target cells.

In recent years, there has been some research suggesting a potential link between CCR5 and Alzheimer's disease. One study published in the journal Cell Stem Cell in 2018 found that the gene variant CCR5-Δ32, which results in a truncated, non-functional form of the CCR5 receptor, appeared to confer a protective effect against Alzheimer's disease. Individuals carrying this gene variant were found to have a reduced risk of developing Alzheimer's.

However, it's important to note that the relationship between CCR5 and Alzheimer's disease is still not fully understood, and more research is needed to determine the exact mechanisms involved and whether targeting CCR5 could be a viable therapeutic approach for Alzheimer's disease. Additionally, the field of Alzheimer's research is vast and multifaceted, with many other factors playing a role in the development and progression of the disease.