Living cells convert the hydrolytic energy of ATP to heat during various biochemical reactions. Oyama et al. show that thermogenesis increases temperature on the order of 1°C only proximal to the heat source, but not on a global basis in either non-excitable or excitable cells.
Prostaglandin E2 stimulates the epithelial sodium channel (ENaC) in cultured mouse cortical collecting duct cells in an autocrine manner
In murine cortical collecting duct cells, prostaglandin E2 (PGE2) stimulates transepithelial sodium transport mediated by the epithelial sodium channel (ENaC). PGE2 is synthesized and secreted by the cells and acts on basolateral prostaglandin E receptor type 4 (EP4).
Combining endocannabinoids with retigabine for enhanced M-channel effect and improved KV7 subtype selectivity
The anticonvulsant retigabine targets the neuronal M-channel but has adverse clinical effects due to its poor KV7 subtype specificity. Larsson et al. reveal that the selectivity of retigabine is improved by coapplication with the endocannabinoid arachidonoyl-L-serine.
Szanto et al. propose a new gating scheme to explain how the Shaker family of voltage-gated potassium channels are inactivated at negative membrane potentials and how these channels recover from this state.
Kv7 channels are powerfully regulated by a wide variety of physiological and pharmacological signals. Larsson et al. describe the direct modulation of Kv7 channels by endocannabinoids and explore how combinations of Kv7 activators with distinct subtype specificities might lead to effective and selective drug cocktails.