TRPV4, Transient receptor potential cation channel subfamily V member 4
Also Known as
TRPV4_HUMAN, TRPV4, VRL2, VROAC
Non-selective calcium permeant cation channel involved in osmotic sensitivity and mechanosensitivity. Activation by exposure to hypotonicity within the physiological range exhibits an outward rectification (PubMed:18826956, PubMed:18695040). Also activated by heat, low pH, citrate and phorbol esters (PubMed:16293632, PubMed:18826956, PubMed:18695040, PubMed:25256292, PubMed:20037586, PubMed:21964574). Increase of intracellular Ca(2+) potentiates currents. Channel activity seems to be regulated by a calmodulin-dependent mechanism with a negative feedback mechanism (PubMed:12724311, PubMed:18826956). Promotes cell-cell junction formation in skin keratinocytes and plays an important role in the formation and/or maintenance of functional intercellular barriers (By similarity). Acts as a regulator of intracellular Ca(2+) in synoviocytes (PubMed:19759329). Plays an obligatory role as a molecular component in the nonselective cation channel activation induced by 4-alpha-phorbol 12,13-didecanoate and hypotonic stimulation in synoviocytes and also regulates production of IL-8 (PubMed:19759329). Together with PKD2, forms mechano- and thermosensitive channels in cilium (PubMed:18695040). Negatively regulates expression of PPARGC1A, UCP1, oxidative metabolism and respiration in adipocytes (By similarity). Regulates expression of chemokines and cytokines related to proinflammatory pathway in adipocytes (By similarity). Together with AQP5, controls regulatory volume decrease in salivary epithelial cells (By similarity). Required for normal development and maintenance of bone and cartilage (PubMed:26249260)., Isoform 5: Non-selective calcium permeant cation channel involved in osmotic sensitivity and mechanosensitivity. Activation by exposure to hypotonicity within the physiological range exhibits an outward rectification. Also activated by phorbol esters. Has the same channel activity as isoform 1, and is activated by the same stimuli., Isoform 2: Lacks channel activity, due to impaired oligomerization and intracellular retention., Isoform 4: Lacks channel activity, due to impaired oligomerization and intracellular retention., Isoform 6: Lacks channel activity, due to impaired oligomerization and intracellular retention. Homotetramer (Probable). Self-associates in an isoform-specific manner (PubMed:16293632). Isoform 1 and isoform 5 can oligomerize, but isoform 2, isoform 4 and isoform 6 cannnot oligomerize (PubMed:16293632). Interacts with calmodulin (PubMed:12724311). Interacts with Map7 and Src family Tyr protein kinases LYN, SRC, FYN, HCK, LCK and YES (By similarity). Interacts with CTNNB1 (By similarity). The TRPV4 and CTNNB1 complex can interact with CDH1 (By similarity). Interacts with PACSIN1, PACSIN2 and PACSIN3 (via SH3 domain) (By similarity). Part of a complex containing MLC1, AQP4, HEPACAM and ATP1B1 (PubMed:22328087). Interacts with ITPR3 (PubMed:18826956). Interacts with AQP5; the interaction is probably indirect and regulates TRPV4 activation by hypotonicity (By similarity). Interacts with ANO1 (By similarity). Interacts (via C-terminus) with PKD2 (via C-terminus) (PubMed:18695040).