Antibodies to calcium/phospholipid binding protein (calelectrin) recognize neurons, astrocytes and schwann cells in the nervous system of rat.

We report on the identification of proteins Mr 32 kDa, 34 kDa, 68 kDa in rat brain or sciatic nerve which cross-react (by immunoblotting) with antibodies to purified Ca2+/phospholipid binding protein calelectrin from Torpedo marmorata. Immunocytochemical staining revealed that anti-calelectrin antibodies labeled cell bodies and processes of cortical neurons and astrocytes in the central nervous system (CNS). In sciatic nerve, calelectrin-like immunoreactivity was expressed in the cytoplasm of Schwann cells of adult as well as newborn rat. Additional staining occurred at periaxonal sites in mature nerve. The localization of calelectrin-related proteins in distinct cell types of the mammalian nervous system suggests a cell-specific role of this new group of proteins in Ca2+-mediated membrane processes involved in neural function