Intracellular histamine binding site (HIC) (HIC)

Intracellular histamine binding sites (HIC) are distinct, non-G-protein coupled receptor sites located within the cell, primarily associated with the endoplasmic reticulum and microsomal membranes (Brandes et al., 1990, PubMed: 2160110). These sites are biochemically linked to the cytochrome P450 superfamily, specifically the CYP2D6 isoform, and serve as targets for intracellular histamine which acts as a second messenger (PubChem CID 3102). HIC sites play a significant role in regulating cell proliferation, platelet aggregation, and the mediation of certain inflammatory responses (Hegyesi et al., 2005, PubMed: 15655102). In oncology, these sites are targeted to inhibit the growth of various cancers, including breast and prostate malignancies, by disrupting histamine-mediated growth signaling (ClinicalTrials.gov: NCT00003113). The small molecule Tesmilifene (DPPE) is the prototypical antagonist for HIC, demonstrating the ability to enhance the cytotoxicity of anthracyclines and other chemotherapeutic agents (National Cancer Institute). Beyond cancer, HIC sites are involved in the regulation of intracellular calcium levels and the modulation of cytochrome P450-dependent metabolism (Journal of Biological Chemistry, 1992). Research suggests that these sites may also be involved in the mechanism of action of certain antidepressants and antipsychotics that exhibit high-affinity binding to HIC (PubMed: 2160110).

Other names

HICH(IC)Intracellular histamine receptorMicrosomal histamine binding siteDPPE-binding site

Antagonism of intracellular histamine binding to microsomal proteins (HIC), which inhibits histamine-mediated cell signaling and proliferation.