Functional and molecular evidence for expression of the renin angiotensin system and ADAM17-mediated ACE2 shedding in COS7 cells.
The renin angiotensin system (RAS) plays a vital role in the regulation of the cardiovascular and renal functions. COS7 is a robust and easily transfectable cell line derived from the kidney of the African green monkey, Cercopithecus aethiops. The aims of this study were to 1) demonstrate the presence of an endogenous and functional RAS in COS7, and 2) investigate the role of a disintegrin and metalloproteinase-17 (ADAM17) in the ectodomain shedding of angiotensin converting enzyme-2 (ACE2). Reverse transcription coupled to gene-specific polymerase chain reaction demonstrated expression of ACE, ACE2, angiotensin II type 1 receptor (AT1R), and renin at the transcript levels in total RNA cell extracts. Western blot and immunohistochemistry identified ACE (60 kDa), ACE2 (75 kDa), AT1R (43 kDa), renin (41 kDa), and ADAM17 (130 kDa) in COS7. At the functional level, a sensitive and selective mass spectrometric approach detected endogenous renin, ACE, and ACE2 activities. ANG-(1-7) formation (m/z 899) from the natural substrate ANG II (m/z 1,046) was detected in lysates and media. COS7 cells stably expressing shRNA constructs directed against endogenous ADAM17 showed reduced ACE2 shedding into the media. This is the first study demonstrating endogenous expression of the RAS and ADAM17 in the widely used COS7 cell line and its utility to study ectodomain shedding of ACE2 mediated by ADAM17 in vitro. The transfectable nature of this cell line makes it an attractive cell model for studying the molecular, functional, and pharmacological properties of the renal RAS.
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Nadja
N
Grobe
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Mauricio
M
Di Fulvio
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Nada
N
Kashkari
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Harshita
H
Chodavarapu
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Hari K
HK
Somineni
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio.
Richa
R
Singh
Department of Pharmacology and Toxicology, Wright State University Boonshoft School of Medicine, Dayton, Ohio khalid.elased@wright.edu.
Khalid M
KM
Elased
D051722:ADAM Proteins / Q000235:genetics / Q000378:metabolism*; D000072198:ADAM17 Protein; D000803:Angiotensin I / Q000378:metabolism; D000804:Angiotensin II / Q000235:genetics / Q000378:metabolism; D000085962:Angiotensin-Converting Enzyme 2; D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D002522:Chlorocebus aethiops; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000378:metabolism; D007703:Peptidyl-Dipeptidase A / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics / Q000378:metabolism; D012083:Renin / Q000235:genetics / Q000378:metabolism; D012084:Renin-Angiotensin System / Q000235:genetics; D014158:Transcription, Genetic; D014162:Transfection
D010446:Peptide Fragments; D012333:RNA, Messenger; D044140:Receptor, Angiotensin, Type 1; D000804:Angiotensin II; D000803:Angiotensin I; D007703:Peptidyl-Dipeptidase A; D000085962:Angiotensin-Converting Enzyme 2; D012083:Renin; D051722:ADAM Proteins; D000072198:ADAM17 Protein; C118790:angiotensin I (1-7)
ACE2 shedding; ADAM17; COS7; renin angiotensin system