Caloxin 2A1 (trifluoroacetate salt)

Caloxin 2A1 is a peptide plasma membrane Ca²⁺/Mg²⁺-ATPase inhibitor (IC₅₀ = 0.4 mM in erythrocyte leaky ghosts).¹ It is selective for the plasma membrane Ca²⁺/Mg²⁺-ATPase over the erythrocyte ghost Mg²⁺- and Na⁺/K⁺-ATPases and the skeletal muscle sarcoplasmic reticulum Ca²⁺/Mg²⁺-ATPase at 0.9 mM. Caloxin 2A1 (0.34 mM) induces relaxation in precontracted rat aortic rings, an effect that can be reversed by the nitric oxide synthase inhibitor L-NAME .

1.Chaudhary, J., Walia, M., Matharu, J., et al.Caloxin: A novel plasma membrane Ca2+ pump inhibitorAm. J. Physiol. Cell Physiol.280(4)C1027-C1030(2001)