6533b871fe1ef96bd12d1a8a

RESEARCH PRODUCT

Cellular and tissue expression of DAPIT, a phylogenetically conserved peptide

Juha J. HulmiHeikki KainulainenHeidi KontroP. Rahkila

subject

HistologyCellular respirationProtein subunitBiophysicsPeptideV-ATPaseBiologyMitochondrionAntibodiesMitochondrial ProteinsHuman Umbilical Vein Endothelial CellsV-ATPaseAnimalsHumansmitochondrionta315lcsh:QH301-705.5PhylogenyDAPIT mitochondrion V-ATPase type 1 diabeteschemistry.chemical_classificationRegulation of gene expressionOriginal Papertype 1 diabetes.HEK 293 cellsMembrane ProteinsCell BiologyProton PumpsCell biologyMitochondriaRatsHEK293 CellsMembrane proteinchemistryBiochemistryGene Expression Regulationlcsh:Biology (General)Organ SpecificityLysosomesDAPIT

description

DAPIT (Diabetes Associated Protein in Insulin-sensitive Tissues) is a small, phylogenetically conserved, 58 amino acid peptide that was previously shown to be down-regulated at mRNA level in insulin-sensitive tissues of type 1 diabetes rats. In this study we characterize a custom made antibody against DAPIT and confirm the mitochondrial presence of DAPIT on cellular level. We also show that DAPIT is localized in lysosomes of HUVEC and HEK 293T cells. In addition, we describe the histological expression of DAPIT in several tissues of rat and man and show that it is highly expressed especially in cells with high aerobic metabolism and epithelial cells related to active transport of nutrients and ions. We propose that DAPIT, in addition to indicated subunit of mitochondrial F-ATPase, is also a subunit of lysosomal V-ATPase suggesting that it is a common component in different proton pumps.

10.4081/ejh.2012.18http://www.ejh.it/index.php/ejh/article/view/1996