Caloxin 2A1 TFA is an extracellular plasma membrane Ca2+-ATPase (PMCA) peptide inhibitor. Caloxin 2A1 TFA does not affect basal Mg2+-ATPase or Na+-K+-ATPase[1].
Caloxin 2A1 TFA inhibits Ca2+-Mg2+-ATPase in human erythrocyte leaky ghosts, but it does not affect basal Mg2+-ATPase or Na+-K+-ATPase in the ghosts or Ca2+-Mg2+-ATPase in the skeletal muscle sarcoplasmic reticulum. Caloxin 2A1 TFA also inhibits Ca2+-dependent formation of the 140-kDa acid-stable acylphosphate[1].Caloxin 2A1 TFA increases airway smooth muscle cells (ASMCs) apoptosis[2].
[1]. J Chaudhary, et al. Caloxin: a novel plasma membrane Ca2+ pump inhibitor. Am J Physiol Cell Physiol. 2001 Apr;280(4):C1027-30.
[2]. Yi-fei Chen, et al. Plasma membrane Ca2+-ATPase regulates Ca2+ signaling and the proliferation of airway smooth muscle cells. Eur J Pharmacol. 2014 Oct 5;740:733-41.