Biomaterial Database

Rapamycin inhibits protein kinase C activity and stimulates Na+ transport in A6 cells. 1996

M D Rokaw, and M West, and J P Johnson

University of Pittsburgh School of Medicine, Laboratory of Epithelial Cell Biology, Renal-Electrolyte Division, and Veterans Affairs Medical Center, Pittsburgh, Pennsylvania 15213-2550, USA. Rokaw@novell1.dept-med.pitt.edu

Rapamycin and FK506 have unique cellular effects despite the fact that they bind to the same set of immunophilins, the FK506 binding proteins (FKBP). We have previously reported that rapamycin (RAP) stimulates sodium transport in A6 cells. FK506 did not stimulate sodium transport but did inhibit the stimulation seen in RAP-treated cells. Since FKBP12 has been shown to have sequence homology with an endogenous inhibitor of protein kinase C (PKC) and PKC inhibition has been shown to increase Na+ channel activity in A6 cells, studies to determine the effect of RAP on PKC activity and its relationship to sodium transport were performed. Here we report that RAP stimulates sodium transport, and the effect is not additive to that seen with a cell-permeant inhibitor of PKCalpha and -beta subtypes. RAP significantly inhibits endogenous PKC activity in A6 cells both in membrane and cytosolic preparations. There is a strong correlation between the degree of inhibition of PKC activity and the stimulation of sodium transport by RAP. RAP has no effect on Na+/K+-ATPase activity over this time course. Purified recombinant FKBP12 with or without FK506 has no effect on PKC activity when incubated with a rat brain-derived PKC preparation of known activity. By contrast, RAP plus FKBP12 significantly inhibits PKC activity. RAP plus FKBP12 inhibits the PKCalpha and not the -beta subtype. The results demonstrate inhibition of PKC activity by RAP and not FK506 through its binding to FKBP12. The inhibition of PKC activity by RAP stimulates sodium transport in A6. The results therefore imply the existence of an endogenous RAP-like ligand which when bound to FKBP12 could regulate Na+ channel activity through this mechanism.

UI	MeSH Term	Description	Entries
D007328	Insulin	A 51-amino acid pancreatic hormone that plays a major role in the regulation of glucose metabolism, directly by suppressing endogenous glucose production (GLYCOGENOLYSIS; GLUCONEOGENESIS) and indirectly by suppressing GLUCAGON secretion and LIPOLYSIS. Native insulin is a globular protein comprised of a zinc-coordinated hexamer. Each insulin monomer containing two chains, A (21 residues) and B (30 residues), linked by two disulfide bonds. Insulin is used as a drug to control insulin-dependent diabetes mellitus (DIABETES MELLITUS, TYPE 1).	Iletin,Insulin A Chain,Insulin B Chain,Insulin, Regular,Novolin,Sodium Insulin,Soluble Insulin,Chain, Insulin B,Insulin, Sodium,Insulin, Soluble,Regular Insulin
D011090	Polyenes	Hydrocarbons with more than one double bond. They are a reduced form of POLYYNES.	Cumulenes
D011493	Protein Kinase C	An serine-threonine protein kinase that requires the presence of physiological concentrations of CALCIUM and membrane PHOSPHOLIPIDS. The additional presence of DIACYLGLYCEROLS markedly increases its sensitivity to both calcium and phospholipids. The sensitivity of the enzyme can also be increased by PHORBOL ESTERS and it is believed that protein kinase C is the receptor protein of tumor-promoting phorbol esters.	Calcium Phospholipid-Dependent Protein Kinase,Calcium-Activated Phospholipid-Dependent Kinase,PKC Serine-Threonine Kinase,Phospholipid-Sensitive Calcium-Dependent Protein Kinase,Protein Kinase M,Calcium Activated Phospholipid Dependent Kinase,Calcium Phospholipid Dependent Protein Kinase,PKC Serine Threonine Kinase,Phospholipid Sensitive Calcium Dependent Protein Kinase,Phospholipid-Dependent Kinase, Calcium-Activated,Serine-Threonine Kinase, PKC
D002352	Carrier Proteins	Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes.	Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D002462	Cell Membrane	The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.	Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D003600	Cytosol	Intracellular fluid from the cytoplasm after removal of ORGANELLES and other insoluble cytoplasmic components.	Cytosols
D004268	DNA-Binding Proteins	Proteins which bind to DNA. The family includes proteins which bind to both double- and single-stranded DNA and also includes specific DNA binding proteins in serum which can be used as markers for malignant diseases.	DNA Helix Destabilizing Proteins,DNA-Binding Protein,Single-Stranded DNA Binding Proteins,DNA Binding Protein,DNA Single-Stranded Binding Protein,SS DNA BP,Single-Stranded DNA-Binding Protein,Binding Protein, DNA,DNA Binding Proteins,DNA Single Stranded Binding Protein,DNA-Binding Protein, Single-Stranded,Protein, DNA-Binding,Single Stranded DNA Binding Protein,Single Stranded DNA Binding Proteins
D004848	Epithelium	The layers of EPITHELIAL CELLS which cover the inner and outer surfaces of the cutaneous, mucus, and serous tissues and glands of the body.	Mesothelium,Epithelial Tissue,Mesothelial Tissue,Epithelial Tissues,Mesothelial Tissues,Tissue, Epithelial,Tissue, Mesothelial,Tissues, Epithelial,Tissues, Mesothelial
D006360	Heat-Shock Proteins	Proteins which are synthesized in eukaryotic organisms and bacteria in response to hyperthermia and other environmental stresses. They increase thermal tolerance and perform functions essential to cell survival under these conditions.	Stress Protein,Stress Proteins,Heat-Shock Protein,Heat Shock Protein,Heat Shock Proteins,Protein, Stress
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia