Regulators of G protein signaling (RGS) proteins modulate heterotrimeric G protein signaling negatively. To broaden an understanding of the roles of RGS proteins in fungal pathogens, we functionally characterized the three RGS protein-encoding genes (rgs1, rgs2 and rgs3) in the phytopathogenic fungus Ustilago maydis. It was found that RGS proteins played distinct roles in the regulation of development and virulence. rgs1 had a minor role in virulence when deleted in a solopathogenic strain. In crosses, rgs1 was dispensable for mating and filamentation, but was required for teliospore production. Haploid rgs2 mutants were affected in cell morphology, growth, mating and were unable to cause disease symptoms in crosses. However, virulence was unaffected when rgs2 was deleted in a solopathogenic strain, suggesting an exclusive involvement in pre-fusion events. These rgs2 phenotypes are likely connected to elevated intracellular cAMP levels. rgs3 mutants were severely attenuated in mating, in their response to pheromone, virulence and formation of mature teliospores. The mating defect could be traced back to reduced expression of the transcription factor rop1. It was speculated that the distinct roles of the three U. maydis RGS proteins were achieved by direct modulation of the Gα subunit-activated signaling pathways as well as through Gα-independent functions.
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http://dx.doi.org/10.1111/mmi.13745 | DOI Listing |
World J Gastroenterol
January 2025
Department of General Surgery, Tianjin Medical University General Hospital, Tianjin Medical University, Tianjin 300052, China.
Background: Regulator of G protein signaling (RGS) proteins participate in tumor formation and metastasis by acting on the α-subunit of heterotrimeric G proteins. The specific effect of RGS, particularly , on the progression of gastric cancer (GC) is not yet clear.
Aim: To explore the role and underlying mechanisms of action of in GC development.
bioRxiv
December 2024
Department of Chemistry, University of Pennsylvania, Philadelphia, PA, USA.
The vasodilator hydralazine (HYZ) has been used clinically for ~ 70 years and remains on the World Health Organization's List of Essential Medicines as a therapy for preeclampsia. Despite its longstanding use and the concomitant progress toward a general understanding of vasodilation, the target and mechanism of HYZ have remained unknown. We show that HYZ selectively targets 2-aminoethanethiol dioxygenase (ADO) by chelating its metal cofactor and alkylating one of its ligands.
View Article and Find Full Text PDFAm J Physiol Heart Circ Physiol
January 2025
Department of Physiology & Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH, 44106.
Regulators of G protein signaling (RGS) proteins finetune signaling via heterotrimeric G proteins to maintain physiologic homeostasis in various organ systems of the human body including the brain, kidney, heart, and the vasculature. Impaired regulation of G protein signaling by RGS proteins is implicated in the pathogenesis of several human diseases including various forms of cardiomyopathy such as hypertrophic cardiomyopathy and dilated cardiomyopathy (DCM). Both genetic and non-genetic changes that impinge on G protein signaling in cardiomyocytes are implicated in the etiology of DCM, and there is accumulating evidence that such genetic and non-genetic changes affecting G protein signaling in cell types other than cardiomyocytes could serve as a DCM trigger in humans.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Obstetrics and Gynecology, Changhai Hospital, Naval Medical University, Shanghai, 200433, China.
Regulator of G protein signaling 1 (RGS1) is known to be highly expressed in various tumors, but its specific effects and regulatory mechanism in ovarian cancer (OC) progression are not well understood. To delve into the tumor biology, a predictive risk model for OC was developed, incorporating RGS1, PRKG2, CD24, and ABCB1, with RGS1 exhibiting the strongest correlation. The model's reliability and validity were confirmed through Kaplan-Meier analysis, receiver operating characteristic (ROC) curve, and principal component analysis (PCA).
View Article and Find Full Text PDFSci Rep
January 2025
Geriatric Center, Affiliated Hospital of Inner Mongolia Medical University, No.1 Tongdao North Street, Huimin District, Hohhot, 010050, China.
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