Modulation of the rat angiotensin type 1a receptor by an upstream short open reading frame

•A highly conserved short open reading frame (sORF) is present in exon 2 upstream of the angiotensin (Ang II) 1a receptor (AT1aR) coding region.•This sORF has no effect on rate of AT1aR internalization.•This sORF decreases ligand potency for Ang II activation of extracellular signal-related kinases...

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Veröffentlicht in:Peptides (New York, N.Y. : 1980) N.Y. : 1980), 2021-06, Vol.140, p.170529-170529, Article 170529
Hauptverfasser: Kadam, Parnika S., Mueller, Susette C., Ji, Hong, Liu, Jun, Pai, Amrita V., Ma, Junfeng, Speth, Robert C., Sandberg, Kathryn
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container_issue
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container_title Peptides (New York, N.Y. : 1980)
container_volume 140
creator Kadam, Parnika S.
Mueller, Susette C.
Ji, Hong
Liu, Jun
Pai, Amrita V.
Ma, Junfeng
Speth, Robert C.
Sandberg, Kathryn
description •A highly conserved short open reading frame (sORF) is present in exon 2 upstream of the angiotensin (Ang II) 1a receptor (AT1aR) coding region.•This sORF has no effect on rate of AT1aR internalization.•This sORF decreases ligand potency for Ang II activation of extracellular signal-related kinases (ERK)1/2.•Inhibition of protein kinase C fully blocks Ang II-induced ERK1/2 activation.•This sORF improves cell survival. The rat angiotensin type 1a receptor (AT1aR) is a peptide hormone G protein-coupled receptor (GPCR) that plays a key role in electrolyte homeostasis and blood pressure control. There is a highly conserved short open reading frame (sORF) in exon 2 (E2) that is downstream from exon 1 (E1) and upstream of the AT1aR coding region located in exon 3 (E3). To determine the role of this E2 sORF in AT1aR signaling, human embryonic kidney-293 (HEK293) cells were transfected with plasmids containing AT1aR cDNA with either an intact or disrupted E2 sORF. The intact sORF attenuated the efficacy of angiotensin (Ang) II (p < 0.001) and sarcosine1,Ile4,Ile8-Ang II (SII), (p < 0.01) to activate AT1aR signaling through extracellular signal-related kinases 1/2 (ERK1/2). A time-course showed agonist-induced AT1aR-mediated ERK1/2 activation was slower in the presence of the intact compared to the disrupted sORF [Ang II: p < 0.01 and SII: p < 0.05]. Ang II-induced ERK1/2 activation was completely inhibited by the protein kinase C (PKC) inhibitor Ro 31–8220 regardless of whether the sORF was intact or disrupted. Flow cytometric analyses suggested the intact sORF improved cell survival; the percentage of live cells increased (p < 0.05) while the percentage of early apoptotic cells decreased (p < 0.01) in cells transfected with the AT1aR plasmid containing the intact sORF. These findings have implications for the regulation of AT1Rs in physiological and pathological conditions and warrant investigation of sORFs in the 5′ leader sequence (5′LS) of other GPCRs.
doi_str_mv 10.1016/j.peptides.2021.170529
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The rat angiotensin type 1a receptor (AT1aR) is a peptide hormone G protein-coupled receptor (GPCR) that plays a key role in electrolyte homeostasis and blood pressure control. There is a highly conserved short open reading frame (sORF) in exon 2 (E2) that is downstream from exon 1 (E1) and upstream of the AT1aR coding region located in exon 3 (E3). To determine the role of this E2 sORF in AT1aR signaling, human embryonic kidney-293 (HEK293) cells were transfected with plasmids containing AT1aR cDNA with either an intact or disrupted E2 sORF. The intact sORF attenuated the efficacy of angiotensin (Ang) II (p < 0.001) and sarcosine1,Ile4,Ile8-Ang II (SII), (p < 0.01) to activate AT1aR signaling through extracellular signal-related kinases 1/2 (ERK1/2). A time-course showed agonist-induced AT1aR-mediated ERK1/2 activation was slower in the presence of the intact compared to the disrupted sORF [Ang II: p < 0.01 and SII: p < 0.05]. Ang II-induced ERK1/2 activation was completely inhibited by the protein kinase C (PKC) inhibitor Ro 31–8220 regardless of whether the sORF was intact or disrupted. Flow cytometric analyses suggested the intact sORF improved cell survival; the percentage of live cells increased (p < 0.05) while the percentage of early apoptotic cells decreased (p < 0.01) in cells transfected with the AT1aR plasmid containing the intact sORF. 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The rat angiotensin type 1a receptor (AT1aR) is a peptide hormone G protein-coupled receptor (GPCR) that plays a key role in electrolyte homeostasis and blood pressure control. There is a highly conserved short open reading frame (sORF) in exon 2 (E2) that is downstream from exon 1 (E1) and upstream of the AT1aR coding region located in exon 3 (E3). To determine the role of this E2 sORF in AT1aR signaling, human embryonic kidney-293 (HEK293) cells were transfected with plasmids containing AT1aR cDNA with either an intact or disrupted E2 sORF. The intact sORF attenuated the efficacy of angiotensin (Ang) II (p < 0.001) and sarcosine1,Ile4,Ile8-Ang II (SII), (p < 0.01) to activate AT1aR signaling through extracellular signal-related kinases 1/2 (ERK1/2). A time-course showed agonist-induced AT1aR-mediated ERK1/2 activation was slower in the presence of the intact compared to the disrupted sORF [Ang II: p < 0.01 and SII: p < 0.05]. 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The rat angiotensin type 1a receptor (AT1aR) is a peptide hormone G protein-coupled receptor (GPCR) that plays a key role in electrolyte homeostasis and blood pressure control. There is a highly conserved short open reading frame (sORF) in exon 2 (E2) that is downstream from exon 1 (E1) and upstream of the AT1aR coding region located in exon 3 (E3). To determine the role of this E2 sORF in AT1aR signaling, human embryonic kidney-293 (HEK293) cells were transfected with plasmids containing AT1aR cDNA with either an intact or disrupted E2 sORF. The intact sORF attenuated the efficacy of angiotensin (Ang) II (p < 0.001) and sarcosine1,Ile4,Ile8-Ang II (SII), (p < 0.01) to activate AT1aR signaling through extracellular signal-related kinases 1/2 (ERK1/2). A time-course showed agonist-induced AT1aR-mediated ERK1/2 activation was slower in the presence of the intact compared to the disrupted sORF [Ang II: p < 0.01 and SII: p < 0.05]. Ang II-induced ERK1/2 activation was completely inhibited by the protein kinase C (PKC) inhibitor Ro 31–8220 regardless of whether the sORF was intact or disrupted. Flow cytometric analyses suggested the intact sORF improved cell survival; the percentage of live cells increased (p < 0.05) while the percentage of early apoptotic cells decreased (p < 0.01) in cells transfected with the AT1aR plasmid containing the intact sORF. These findings have implications for the regulation of AT1Rs in physiological and pathological conditions and warrant investigation of sORFs in the 5′ leader sequence (5′LS) of other GPCRs.]]></abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>33744369</pmid><doi>10.1016/j.peptides.2021.170529</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0003-2967-8336</orcidid></addata></record>
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ispartof Peptides (New York, N.Y. : 1980), 2021-06, Vol.140, p.170529-170529, Article 170529
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subjects Angiotensin II - metabolism
Angiotensin II - pharmacology
Animals
Biased agonist
Blood Pressure - physiology
Cell Line
Cell Survival - physiology
Endocytosis
Humans
MAP Kinase Signaling System - drug effects
Open Reading Frames - genetics
PEP7
Phosphorylation
Posttranscriptional regulation
Rats
Receptor internalization
Receptor, Angiotensin, Type 1 - chemistry
Receptor, Angiotensin, Type 1 - genetics
Receptor, Angiotensin, Type 1 - metabolism
Signal Transduction
Transfection - methods
β-arrestin
title Modulation of the rat angiotensin type 1a receptor by an upstream short open reading frame
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