that submicromolar Ca2+ signals cannot induce mitochondrial Ca2+ uptake. The close
apposition of the plasma membrane or the endoplamic reticulum (ER) to the mitochondria
and the limited Ca2+ diffusion in the cytoplasm result in the formation of perimitochondrial
high-Ca2+ microdomains (HCMDs) capable of activating mitochondrial Ca2+ uptake. The
possibility of mitochondrial Ca2+ uptake at low submicromolar [Ca2+] c has not yet been …