Identification of dipeptidyl peptidase 3 as the Angiotensin-(1-7) degrading peptidase in human HK-2 renal epithelial cells.
Angiotensin-(1-7) (Ang-(1-7)) is expressed within the kidney and exhibits renoprotective actions that antagonize the inflammatory, fibrotic and pro-oxidant effects of the Ang II-AT1 receptor axis. We previously identified a peptidase activity from sheep brain, proximal tubules and human HK-2 proximal tubule cells that metabolized Ang-(1-7); thus, the present study isolated and identified the Ang-(1-7) peptidase. Utilizing ion exchange and hydrophobic interaction chromatography, a single 80kDa protein band on SDS-PAGE was purified from HK-2 cells. The 80kDa band was excised, the tryptic digest peptides analyzed by LC-MS and a protein was identified as the enzyme dipeptidyl peptidase 3 (DPP 3, EC: 3.4.14.4). A human DPP 3 antibody identified a single 80kDa band in the purified enzyme preparation identical to recombinant human DPP 3. Both the purified Ang-(1-7) peptidase and DPP 3 exhibited an identical hydrolysis profile of Ang-(1-7) and both activities were abolished by the metallopeptidase inhibitor JMV-390. DPP 3 sequentially hydrolyzed Ang-(1-7) to Ang-(3-7) and rapidly converted Ang-(3-7) to Ang-(5-7). Kinetic analysis revealed that Ang-(3-7) was hydrolyzed at a greater rate than Ang-(1-7) [17.9 vs. 5.5 nmol/min/μg protein], and the Km for Ang-(3-7) was lower than Ang-(1-7) [3 vs. 12μM]. Finally, chronic treatment of the HK-2 cells with 20nM JMV-390 reduced intracellular DPP 3 activity and tended to augment the cellular levels of Ang-(1-7). We conclude that DPP 3 may influence the cellular expression of Ang-(1-7) and potentially reflect a therapeutic target to augment the actions of the peptide.
Department of Surgery, Hypertension & Vascular Research, Cardiovascular Sciences Center, Wake Forest University School of Medicine, Winston-Salem, NC, United States.
Nildris
N
Cruz-Diaz
Department of Surgery, Hypertension & Vascular Research, Cardiovascular Sciences Center, Wake Forest University School of Medicine, Winston-Salem, NC, United States.
Bryan A
BA
Wilson
Department of Surgery, Hypertension & Vascular Research, Cardiovascular Sciences Center, Wake Forest University School of Medicine, Winston-Salem, NC, United States.
Nancy T
NT
Pirro
Department of Surgery, Hypertension & Vascular Research, Cardiovascular Sciences Center, Wake Forest University School of Medicine, Winston-Salem, NC, United States.
K Bridget
KB
Brosnihan
TKL Research Inc., Fairlawn, NJ, United States.
Allyson C
AC
Marshall
Department of Surgery, Hypertension & Vascular Research, Cardiovascular Sciences Center, Wake Forest University School of Medicine, Winston-Salem, NC, United States. Electronic address: mchappel@wakehealth.edu.
Mark C
MC
Chappell
D000803:Angiotensin I / Q000235:genetics* / Q000378:metabolism; D000804:Angiotensin II / Q000235:genetics / Q000378:metabolism*; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000235:genetics* / Q000378:metabolism; D004847:Epithelial Cells / Q000378:metabolism; D006801:Humans; D006868:Hydrolysis; D007668:Kidney / Q000187:drug effects / Q000378:metabolism*; D009842:Oligopeptides / Q000008:administration & dosage; D010446:Peptide Fragments / Q000235:genetics* / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism
D009842:Oligopeptides; D010446:Peptide Fragments; D017382:Reactive Oxygen Species; D000804:Angiotensin II; C078372:JMV 390-1; D000803:Angiotensin I; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; C539603:DPP3 protein, human; C118790:angiotensin I (1-7)
Angiotensin-(1–7); DPP 3; HK-2 cells; Renin angiotensin system