New research on signaling pathways in immune cells bolsters evidence of connections between the central nervous system and the immune system.
The findings may also advance the scientific foundation for a potential HIV treatment that may block the virus that causes AIDS.
The cell culture study by a research team from The Children's Hospital of Philadelphia and the University of Pennsylvania appears in the Proceedings of the National Academy of Sciences.
The team, led by Steven D. Douglas, M.D., chief of the Section of Immunology at The Children's Hospital of Philadelphia, analyzed neurokinin-1 receptors found on the surfaces of monocytes, immune cells that develop into macrophages. The neurokinin-1 receptors (NK-1R) are docking sites for substance P, a well-known neurotransmitter that plays important roles in both immune function and the nervous system.
In the current study, the Douglas team investigated two forms of NK-1R in a human monocyte/macrophage cell line. One was a full-length receptor, the other a shortened version with fewer amino acids. When the researchers added substance P to cell cultures with the receptors, both responded with an increase in calcium ions, but used distinct signaling pathways.
The truncated NK-IR did not respond directly to substance P, but worked through another signaling molecule, the chemokine RANTES, to increase the calcium flow. The RANTES molecule is important because it binds to another cell receptor, CCR5, which is crucial in allowing common strains of HIV (R5 strains) to infect immune cells.
Significantly, when the investigators added the drug aprepitant, which binds to NK-1R, to their cell cultures, it inhibited signaling from both the full-length and short form of the receptors.