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Ribosomal s6 kinase (RSK) is a mediator of aquaporin-2 S256 phosphorylation and membrane accumulation after EGFR inhibition with erlotinib.
Am J Physiol Renal Physiol
January 2025
Division of Nephrology, Program in Membrane Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts, USA.
Vasopressin (VP) activates protein kinase A (PKA), resulting in phosphorylation events and membrane accumulation of aquaporin-2 (AQP2). Epidermal growth factor receptor (EGFR) inhibition with erlotinib also induces AQP2 membrane trafficking with a phosphorylation pattern similar to VP, but without increasing PKA activity. Here, we identify the ribosomal s6 kinase (RSK) as a major mediator phosphorylating AQP2 in this novel, erlotinib-induced pathway.
View Article and Find Full Text PDFDonation After Circulatory Death Liver Transplantation: Impact of Normothermic Machine Perfusion on Key Variables.
Anesth Analg
September 2024
From the Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Phoenix, Arizona.
Background: During orthotopic liver transplantation, allograft reperfusion is a dynamic point in the operation and often requires vasoactive medications and blood transfusions. Normothermic machine perfusion (NMP) of liver allografts has emerged to increase the number of transplantable organs and may have utility during donation after circulatory death (DCD) liver transplantation in reducing transfusion burden and vasoactive medication requirements.
Methods: This is a single-center retrospective study involving 226 DCD liver transplant recipients who received an allograft transported with NMP (DCD-NMP group) or with static cold storage (DCD-SCS group).
A lipidated peptide derived from the C-terminal tail of the vasopressin 2 receptor shows promise as a new β-arrestin inhibitor.
Pharmacol Res
January 2025
Department of Pharmacology-Physiology, Faculty of Medicine and Health Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada; Institut de Pharmacologie de Sherbrooke, Université de Sherbrooke, Sherbrooke, QC, Canada; RECITAL International Partnership Lab, Université de Caen-Normandie, Caen, France & Université de Sherbrooke, Sherbrooke, QC, Canada. Electronic address:
β-arrestins play pivotal roles in seven transmembrane receptor (7TMR) signalling and trafficking. To study their functional role in regulating specific receptor systems, current research relies mainly on genetic tools, as few pharmacological options are available. To address this issue, we designed and synthesised a novel lipidated phosphomimetic peptide inhibitor targeting β-arrestins, called ARIP, which was developed based on the C-terminal tail (A343-S371) of the vasopressin V2 receptor.
View Article and Find Full Text PDF[Revisiting the vasopressin V2 receptor].
Sheng Li Xue Bao
December 2024
Department of Physiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China.
Arginine vasopressin (AVP) plays a crucial role in various physiological processes including water reabsorption, cardiovascular homeostasis, hormone secretion, and social behavior. AVP acts through three distinct receptor subtypes, i.e.
View Article and Find Full Text PDFPutative biomarkers of hepatic dysfunction in critically ill sepsis patients.
Clin Exp Med
January 2025
Pediatrics, Western University, London, ON, Canada.
Sepsis is a major cause of morbidity and mortality worldwide. Among the various types of end-organ damage associated with sepsis, hepatic injury is linked to significantly higher mortality rates compared to dysfunction in other organ systems. This study aimed to investigate potential biomarkers of hepatic injury in sepsis patients through a multi-center, case-control approach.
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