Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Vasoactive intestinal peptide (VIP) receptor 2 (VIPR2) is a G protein-coupled receptor that binds to Gαs, Gαi, and Gαq proteins to regulate various downstream signaling molecules, such as protein kinase A (PKA), phosphatidylinositol 3-kinase (PI3K), and phospholipase C. In this study, we examined the role of VIPR2 in cell cycle progression. KS-133, a newly developed VIPR2-selective antagonist peptide, attenuated VIP-induced cell proliferation in MCF-7 cells. The percentage of cells in the S-M phase was decreased in MCF-7 cells treated with KS-133. KS-133 in the presence of VIP decreased the phosphorylation of extracellular signal-regulated kinase (ERK), AKT, and glycogen synthase kinase-3β (GSK3β), resulting in a decrease in cyclin D1 levels. In MCF-7 cells stably-expressing VIPR2, KS-133 decreased PI3K activity and cAMP levels. Treatment with the ERK-specific kinase (MEK) inhibitor U0126 and the class I PI3K inhibitor ZSTK474 decreased the percentage of cells in the S phase. KS-133 reduced the percentage of cells in the S phase more than treatment with U0126 or ZSTK474 alone and did not affect the effect of the mixture of these inhibitors. Our findings suggest that VIPR2 signaling regulates cyclin D1 levels through the cAMP/PKA/ERK and PI3K/AKT/GSK3β pathways, and mediates the G1/S transition to control cell proliferation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jphs.2024.01.002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The ability of the polysaccharide extract Cissus sicyoides L. leaves to maintain normal follicle structure in ovarian tissue culture.
In Vitro Cell Dev Biol Anim
September 2025
Postgraduate Program in Physiological Sciences (PPGCF), State University of Ceará (UECE), Fortaleza, CE, Brazil.
The present study aimed to (1) evaluate the effects of different concentrations of the polysaccharide extract of Cissus sicyoides (PE-Cs) during in vitro culture of preantral follicles included in goat ovarian tissue on (i) follicular morphology and activation, (ii) ovarian stromal density, (iii) follicular and oocyte diameters, (iv) antioxidant enzymes activity (SOD, CAT, and GPx), (v) quantification of MDA, thiol, and nitrite levels; as well as to (2) measure the total antioxidant capacity of the extract. The ovarian cortex fragments were cultured at 39 °C in a humidified atmosphere with 5% CO for 6 d in alpha-modified minimum essential medium (αMEM) supplemented with insulin, transferrin, and selenium; hypoxanthine; glutamine; and bovine serum albumin, which was called αMEM alone or added of PE-Cs at 20, 40, or 80 µg/mL. At the end of the culture period, a reduction in the percentage of normal follicles in all treatments using PE-Cs compared to fresh control and αMEM.
View Article and Find Full Text PDFPrescription and self-reported use of endocrine therapy among black hormone receptor-positive breast cancer survivors in the Detroit Research on Cancer Survivors cohort.
Breast Cancer Res Treat
September 2025
Department of Oncology, Wayne State University School of Medicine, Detroit, MI, USA.
Purpose: Black women with hormone receptor-positive (HR +) breast cancer are twice as likely as White women to have weakly HR + tumors (1-10% positive cells). Patients with weakly HR + tumors are less frequently prescribed ET and have 60% higher mortality than strongly HR + tumors (> 10% positive cells). We evaluated factors associated with ET prescription and self-reported use among Black women with HR + breast cancer.
View Article and Find Full Text PDFFabrication and production of conjugated neurotensin-silver nanoparticles and evaluation of its effect on pathophysiology of allergic asthma.
Allergol Immunopathol (Madr)
September 2025
Department of Immunology, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran;
Asthma, a respiratory tract disease, is characterized by inflammation and obstruction of airway. Inflammatory cells play a significant role in allergic asthma, and there is no complete cure for asthma. One of the new approaches in medicines is nanoparticle-base treatment.
View Article and Find Full Text PDFOptimization of Culture Conditions for Human Ovarian Stem Cells Using Gelatin-Coated Surfaces.
Cureus
August 2025
Stem Cell and Regenerative Biology Laboratory, Sri Ramachandra Institute of Higher Education and Research, Chennai, IND.
Introduction: The presence of stem cells in the ovary has been a topic of discussion due to their questionable existence. Isolation of stem cells has been possible by enzymatic digestion; however, the percentage of cells harvested and expanded has not been satisfactory. This could be due to the lack of optimal adhesion provided by the standard commercial culture dishes, which affects the initial attachment and further growth of cells.
View Article and Find Full Text PDFPI3K Signaling Pathway Inhibitor Affects Myeloma Cells in a Culture-Dependent Manner.
Adv Pharm Bull
July 2025
Department of Hematology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran.
Purpose: The survival and progression of multiple myeloma (MM) cells rely heavily on supportive factors and cells within the MM microenvironment, notably macrophages. The PI3K signaling pathway plays a crucial role in both myeloma cells survival and macrophage polarity, making it a potential target for altering the MM microenvironment dynamics.
Methods: In this study, the impact of LY294002, a PI3K signaling pathway inhibitor, on the viability of U266 myeloma cells in mono-culture and MM patient-derived bone marrow mononuclear cells (BM-MNCs) in co-culture was investigated.