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Du Y, Zhang Y, Jiang Z, Xu L, Ru J, Wei S, Chen W, Dong R, Zhang S, Jia T. Triptolide alleviates acute gouty arthritis caused by monosodium urate crystals by modulating macrophage polarization and neutrophil activity. Immunol Lett 2024; 269:106907. [PMID: 39122094 DOI: 10.1016/j.imlet.2024.106907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 07/16/2024] [Accepted: 08/07/2024] [Indexed: 08/12/2024]
Abstract
The present study focused on the efficacy and role of triptolide (TPL) in relieving symptoms of acute gouty arthritis (AGA) in vivo and in vitro. The effects of TPL in AGA were investigated in monosodium urate (MSU)-treated rat ankles, RAW264.7 macrophages, and neutrophils isolated from mouse peritoneal cavity. Observation of pathological changes in the ankle joint of rats. Enzyme-linked immunosorbent assay and real-time quantitative polymerase chain reaction (RT-qPCR) were performed to detect the expression levels of inflammatory factors and chemokines. The levels of the indicators of macrophage M1/M2 polarization, and the mechanistic targets of Akt and rapamycin complex 2, were determined via western blotting and RT-qPCR. The expression levels of CD86 and CD206 were detected using immunohistochemistry. Neutrophil migration was observed via air pouch experiments in vivo and Transwell cell migration assay in vitro. Myeloperoxidase (MPO) and Neutrophil elastase (NE) release was analyzed by via immunohistochemistry and immunofluorescence. The expression levels of beclin-1, LC3B, Bax, Bcl-2, and cleaved caspase-3 in neutrophils were determined via western blotting and immunofluorescence. Neutrophil apoptosis was detected using the terminal deoxynucleotidyl transferase dUTP nick end labeling assay. Our results suggest that TPL inhibited inflammatory cell infiltration in rat ankle joints and inflammatory factor and chemokine secretion in rat serum, regulated macrophage polarization through the PI3K/AKT signaling pathway, suppressed inflammatory factor and chemokine expression in neutrophils, and inhibited neutrophil migration, neutrophil extracellular trap formation, transitional autophagy, and apoptosis. This suggests that TPL can prevent and treat MSU-induced AGA by regulating macrophage polarization through the PI3K/Akt pathway and modulating neutrophil activity.
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Affiliation(s)
- Yan Du
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Yurong Zhang
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Zhuxin Jiang
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Lianjie Xu
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Jing Ru
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Shanshan Wei
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Wenhui Chen
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China; Yunnan Provincial Key Laboratory of Molecular Biology for Sinomedicine, Kunming, Yunnan 450500, , China; Key Laboratory of Microcosmic Syndrome Differentiation, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 450500, , China
| | - Renjie Dong
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China
| | - Shan Zhang
- Faculty of Basic Medicine, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650500, China; Yunnan Provincial Key Laboratory of Molecular Biology for Sinomedicine, Kunming, Yunnan 450500, , China; Key Laboratory of Microcosmic Syndrome Differentiation, Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 450500, , China.
| | - Tao Jia
- Department of Orthopedics, First Clinical Medical College of Yunnan University of Traditional Chinese Medicine, Kunming, Yunnan 650021, , China.
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Duewell BR, Wilson NE, Bailey GM, Peabody SE, Hansen SD. Molecular dissection of PI3Kβ synergistic activation by receptor tyrosine kinases, GβGγ, and Rho-family GTPases. eLife 2024; 12:RP88991. [PMID: 38713746 PMCID: PMC11076043 DOI: 10.7554/elife.88991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024] Open
Abstract
Phosphoinositide 3-kinase (PI3K) beta (PI3Kβ) is functionally unique in the ability to integrate signals derived from receptor tyrosine kinases (RTKs), G-protein coupled receptors, and Rho-family GTPases. The mechanism by which PI3Kβ prioritizes interactions with various membrane-tethered signaling inputs, however, remains unclear. Previous experiments did not determine whether interactions with membrane-tethered proteins primarily control PI3Kβ localization versus directly modulate lipid kinase activity. To address this gap in our knowledge, we established an assay to directly visualize how three distinct protein interactions regulate PI3Kβ when presented to the kinase in a biologically relevant configuration on supported lipid bilayers. Using single molecule Total Internal Reflection Fluorescence (TIRF) Microscopy, we determined the mechanism controlling PI3Kβ membrane localization, prioritization of signaling inputs, and lipid kinase activation. We find that auto-inhibited PI3Kβ prioritizes interactions with RTK-derived tyrosine phosphorylated (pY) peptides before engaging either GβGγ or Rac1(GTP). Although pY peptides strongly localize PI3Kβ to membranes, stimulation of lipid kinase activity is modest. In the presence of either pY/GβGγ or pY/Rac1(GTP), PI3Kβ activity is dramatically enhanced beyond what can be explained by simply increasing membrane localization. Instead, PI3Kβ is synergistically activated by pY/GβGγ and pY/Rac1 (GTP) through a mechanism consistent with allosteric regulation.
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Affiliation(s)
- Benjamin R Duewell
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of OregonEugeneUnited States
| | - Naomi E Wilson
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of OregonEugeneUnited States
| | - Gabriela M Bailey
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of OregonEugeneUnited States
| | - Sarah E Peabody
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of OregonEugeneUnited States
| | - Scott D Hansen
- Department of Chemistry and Biochemistry, Institute of Molecular Biology, University of OregonEugeneUnited States
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3
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Duewell BR, Wilson NE, Bailey GM, Peabody SE, Hansen SD. Molecular dissection of PI3Kβ synergistic activation by receptor tyrosine kinases, GβGγ, and Rho-family GTPases. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.01.538969. [PMID: 37205345 PMCID: PMC10187233 DOI: 10.1101/2023.05.01.538969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The class 1A phosphoinositide 3-kinase (PI3K) beta (PI3Kβ) is functionally unique in the ability to integrate signals derived from receptor tyrosine kinases (RTKs), heterotrimeric guanine nucleotide-binding protein (G-protein)-coupled receptors (GPCRs), and Rho-family GTPases. The mechanism by which PI3Kβ prioritizes interactions with various membrane tethered signaling inputs, however, remains unclear. Previous experiments have not been able to elucidate whether interactions with membrane-tethered proteins primarily control PI3Kβ localization versus directly modulate lipid kinase activity. To address this gap in our understanding of PI3Kβ regulation, we established an assay to directly visualize and decipher how three distinct protein interactions regulate PI3Kβ when presented to the kinase in a biologically relevant configuration on supported lipid bilayers. Using single molecule Total Internal Reflection Fluorescence (TIRF) Microscopy, we determined the mechanism controlling membrane localization of PI3Kβ, prioritization of signaling inputs, and lipid kinase activation. We find that auto-inhibited PI3Kβ prioritizes interactions with RTK-derived tyrosine phosphorylated (pY) peptides before engaging either GβGγ or Rac1(GTP). Although pY peptides strongly localize PI3Kβ to membranes, stimulation of lipid kinase activity is modest. In the presence of either pY/GβGγ or pY/Rac1(GTP), PI3Kβ activity is dramatically enhanced beyond what can be explained by simply increasing the strength of membrane localization. Instead, PI3Kβ is synergistically activated by pY/GβGγ and pY/Rac1(GTP) through a mechanism consistent with allosteric regulation.
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He S, Song W, Cui S, Li J, Jiang Y, Chen X, Peng L. Modulation of miR-146b by N6-methyladenosine modification remodels tumor-associated macrophages and enhances anti-PD-1 therapy in colorectal cancer. Cell Oncol (Dordr) 2023; 46:1731-1746. [PMID: 37402945 DOI: 10.1007/s13402-023-00839-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/17/2023] [Indexed: 07/06/2023] Open
Abstract
PURPOSE MicroRNA-146b (miR-146b) alleviates experimental colitis in mice by mediating macrophage polarization and the release of inflammatory factors. Our goals were to evaluate the antitumor efficacy of miR-146b in colorectal cancer (CRC) and to investigate the underlying mechanisms. METHODS We used murine models of CRC to evaluate whether miR-146b influenced the progression of tumors independent of tumor-associated macrophages (TAMs). RNA immunoprecipitation, N6-methyladenosine (m6A) RNA immunoprecipitation and in vitro pri-miRNA processing assays were conducted to examine whether m6A mediates the maturation of pri-miR-146b/miR-146b. In a series of in vitro and in vivo experiments, we further defined the molecular mechanisms of methyltransferase-like 3 (METTL3)/miR-146b-mediated antitumor immunity and its efficacy in combination with anti-PD-1 immunotherapy. RESULTS We found that miR-146b deletion supported tumor progression by increasing the number of alternatively activated (M2) TAMs. Mechanistically, the m6A-related "writer" protein METTL3 and "reader" protein HNRNPA2B1 controlled miR-146b maturation by regulating the m6A modification region of pri-miR-146b. Furthermore, miR-146b deletion promoted the polarization of M2-TAMs by enhancing phosphoinositide 3-kinase (PI3K)/AKT signaling, and this effect was mediated by the class IA PI3K catalytic subunit p110β, which reduced T cell infiltration, aggravated immunosuppression and ultimately promoted tumor progression. METTL3 knockdown or miR-146b deletion induced programmed death ligand 1 (PD-L1) production via the p110β/PI3K/AKT pathway in TAMs and consequently augmented the antitumor activity of anti-PD-1 immunotherapy. CONCLUSIONS The maturation of pri-miR-146b is m6A-dependent, and miR-146b deletion-mediated TAM differentiation promotes the development of CRC by activating the PI3K/AKT pathway, which induces upregulation of PD-L1 expression, inhibits T cell infiltration into the TME and enhances the antitumor activity of anti-PD-1 immunotherapy. The findings reveal that targeting miR-146b can serve as an adjuvant to anti-PD-1 immunotherapy.
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Affiliation(s)
- Shuying He
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China
| | - Wen Song
- Dongguan People's Hospital, Dongguan City, Guangdong Province, China
| | - Shudan Cui
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China
| | - Jiating Li
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China
| | - Yonghong Jiang
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China
| | - Xueqing Chen
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China.
| | - Liang Peng
- Department of Gastroenterology, First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, No. 151, Yanjiang West Road, Guangzhou City, 510120, Guangdong Province, China.
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5
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Bou Malham V, Benzoubir N, Vaquero J, Desterke C, Agnetti J, Song PX, Gonzalez-Sanchez E, Arbelaiz A, Jacques S, Di Valentin E, Rahmouni S, Tan TZ, Samuel D, Thiery JP, Sebagh M, Fouassier L, Gassama-Diagne A. Intrinsic cancer cell phosphoinositide 3-kinase δ regulates fibrosis and vascular development in cholangiocarcinoma. Liver Int 2023; 43:2776-2793. [PMID: 37804055 DOI: 10.1111/liv.15751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/06/2023] [Accepted: 09/16/2023] [Indexed: 10/08/2023]
Abstract
BACKGROUND & AIMS The class I- phosphatidylinositol-3 kinases (PI3Ks) signalling is dysregulated in almost all human cancers whereas the isoform-specific roles remain poorly investigated. We reported that the isoform δ (PI3Kδ) regulated epithelial cell polarity and plasticity and recent developments have heightened its role in hepatocellular carcinoma (HCC) and solid tumour progression. However, its role in cholangiocarcinoma (CCA) still lacks investigation. APPROACH & RESULTS Immunohistochemical analyses of CCA samples reveal a high expression of PI3Kδ in the less differentiated CCA. The RT-qPCR and immunoblot analyses performed on CCA cells stably overexpressing PI3Kδ using lentiviral construction reveal an increase of mesenchymal and stem cell markers and the pluripotency transcription factors. CCA cells stably overexpressing PI3Kδ cultured in 3D culture display a thick layer of ECM at the basement membrane and a wide single lumen compared to control cells. Similar data are observed in vivo, in xenografted tumours established with PI3Kδ-overexpressing CCA cells in immunodeficient mice. The expression of mesenchymal and stemness genes also increases and tumour tissue displays necrosis and fibrosis, along with a prominent angiogenesis and lymphangiogenesis, as in mice liver of AAV8-based-PI3Kδ overexpression. These PI3Kδ-mediated cell morphogenesis and stroma remodelling were dependent on TGFβ/Src/Notch signalling. Whole transcriptome analysis of PI3Kδ using the cancer cell line encyclopedia allows the classification of CCA cells according to cancer progression. CONCLUSIONS Overall, our results support the critical role of PI3Kδ in the progression and aggressiveness of CCA via TGFβ/src/Notch-dependent mechanisms and open new directions for the classification and treatment of CCA patients.
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Affiliation(s)
- Vanessa Bou Malham
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
| | - Nassima Benzoubir
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
| | - Javier Vaquero
- Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, INSERM, Paris, France
- Centro de Investigación del Cáncer, Instituto de Biología Molecular y Celular del Cáncer, CSIC-Universidad de Salamanca, Salamanca, Spain
| | | | - Jean Agnetti
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
| | - Pei Xuan Song
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
| | - Ester Gonzalez-Sanchez
- Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, INSERM, Paris, France
- TGF-β and Cancer Group, Oncobell Program, Bellvitge Biomedical Research Institute (IDIBELL), Barcelona, Spain
- Oncology Program, CIBEREHD, National Biomedical Research Institute on Liver and Gastrointestinal Diseases, Instituto de Salud Carlos III, Madrid, Spain
- Inovarion, Paris, France
| | - Ander Arbelaiz
- Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, INSERM, Paris, France
| | - Sophie Jacques
- Laboratory of Animal Genomics, GIGA-Medical Genomics, GIGA-Institute, University of Liège, Liège, Belgium
| | - Emanuel Di Valentin
- Plateforme des vecteurs viraux, Université de Liège, GIGA B34, Liège, Belgium
| | - Souad Rahmouni
- Laboratory of Animal Genomics, GIGA-Medical Genomics, GIGA-Institute, University of Liège, Liège, Belgium
| | - Tuan Zea Tan
- Genomics and Data Analytics Core (GeDaC), Cancer Science Institute of Singapore, National University of Singapore, Singapore, Singapore
| | - Didier Samuel
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
- Centre Hepato-Biliaire, AP-HP Hôpital Paul Brousse, Villejuif, France
| | - Jean Paul Thiery
- Guangzhou Laboratory, International Biological Island Guangzhou, Guangzhou, China
| | - Mylène Sebagh
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
- Laboratoire d'Anatomopathologie, AP-HP Hôpital Paul-Brousse, Villejuif, France
| | - Laura Fouassier
- Centre de Recherche Saint-Antoine, CRSA, Sorbonne Université, INSERM, Paris, France
| | - Ama Gassama-Diagne
- INSERM, Unité 1193, Villejuif, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, France
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Davies RA, Barbee BR, Garcia-Sifuentes Y, Butkovich LM, Gourley SL. Subunit-selective PI3-kinase control of action strategies in the medial prefrontal cortex. Neurobiol Learn Mem 2023; 203:107789. [PMID: 37328026 PMCID: PMC10527156 DOI: 10.1016/j.nlm.2023.107789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 06/07/2023] [Accepted: 06/11/2023] [Indexed: 06/18/2023]
Abstract
PI3-kinase (PI3K) is an intracellular signaling complex that is stimulated upon cocaine exposure and linked with the behavioral consequences of cocaine. We recently genetically silenced the PI3K p110β subunit in the medial prefrontal cortex following repeated cocaine in mice, reinstating the capacity of these mice to engage in prospective goal-seeking behavior. In the present short report, we address two follow-up hypotheses: 1) The control of decision-making behavior by PI3K p110β is attributable to neuronal signaling, and 2) PI3K p110β in the healthy (i.e., drug-naïve) medial prefrontal cortex has functional consequences in the control of reward-related decision-making strategies. In Experiment 1, we found that silencing neuronal p110β improved action flexibility following cocaine. In Experiment 2, we reduced PI3K p110β in drug-naïve mice that were extensively trained to respond for food reinforcers. Gene silencing caused mice to abandon goal-seeking strategies, unmasking habit-based behaviors that were propelled by interactions with the nucleus accumbens. Thus, PI3K control of goal-directed action strategies appears to act in accordance with an inverted U-shaped function, with "too much" (following cocaine) or "too little" (following p110β subunit silencing) obstructing goal seeking and causing mice to defer to habit-like response sequences.
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Affiliation(s)
- Rachel A Davies
- Department of Pediatrics, Emory University School of Medicine, Emory National Primate Research Center, Emory University, Children's Healthcare of Atlanta, USA
| | - Britton R Barbee
- Department of Pediatrics, Emory University School of Medicine, Emory National Primate Research Center, Emory University, Children's Healthcare of Atlanta, USA; Graduate Program in Molecular and Systems Pharmacology, Emory University, USA
| | - Yesenia Garcia-Sifuentes
- Department of Pediatrics, Emory University School of Medicine, Emory National Primate Research Center, Emory University, Children's Healthcare of Atlanta, USA; Graduate Program in Neuroscience, Emory University, USA
| | - Laura M Butkovich
- Department of Pediatrics, Emory University School of Medicine, Emory National Primate Research Center, Emory University, Children's Healthcare of Atlanta, USA
| | - Shannon L Gourley
- Department of Pediatrics, Emory University School of Medicine, Emory National Primate Research Center, Emory University, Children's Healthcare of Atlanta, USA; Graduate Program in Molecular and Systems Pharmacology, Emory University, USA; Graduate Program in Neuroscience, Emory University, USA.
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7
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Masoud AG, Lin J, Zhu LF, Tao K, Ness NW, Kassiri Z, Moore RB, Vanhaesebroeck B, West L, Anderson CC, Oudit GY, Murray AG. Endothelial phosphoinositide 3-kinase-β inactivation confers protection from immune-mediated vascular injury. Am J Transplant 2023; 23:202-213. [PMID: 36804130 DOI: 10.1016/j.ajt.2022.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 10/03/2022] [Accepted: 11/02/2022] [Indexed: 01/06/2023]
Abstract
Heart transplant and recipient survival are limited by immune cell-mediated injury of the graft vasculature. We examined the role of the phosphoinositide 3-kinase-β (PI3Kβ) isoform in endothelial cells (EC) during coronary vascular immune injury and repair in mice. In minor histocompatibility-antigen mismatched allogeneic heart grafts, a robust immune response was mounted to each wild-type, PI3Kβ inhibitor-treated, or endothelial-selective PI3Kβ knockout (ECβKO) graft transplanted to wild-type recipients. However, microvascular EC loss and progressive occlusive vasculopathy only developed in control, but not PI3Kβ-inactivated hearts. We observed a delay in inflammatory cell infiltration of the ECβKO grafts, particularly in the coronary arteries. Surprisingly, this was accompanied by an impaired display of proinflammatory chemokine and adhesion molecules by the ECβKO ECs. In vitro, tumor necrosis factor α-stimulated endothelial ICAM1 and VCAM1 expression was blocked by PI3Kβ inhibition or RNA interference. Selective PI3Kβ inhibition also blocked tumor necrosis factor α-stimulated degradation of inhibitor of nuclear factor kappa Bα and nuclear translocation of nuclear factor kappa B p65 in EC. These data identify PI3Kβ as a therapeutic target to reduce vascular inflammation and injury.
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Affiliation(s)
- Andrew G Masoud
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada; Alberta Transplant Institute, Edmonton, Alberta, Canada
| | - Jiaxin Lin
- Alberta Transplant Institute, Edmonton, Alberta, Canada; Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Lin F Zhu
- Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Kesheng Tao
- Alberta Transplant Institute, Edmonton, Alberta, Canada; Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Nathan W Ness
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada; Alberta Transplant Institute, Edmonton, Alberta, Canada
| | - Zamaneh Kassiri
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
| | - Ronald B Moore
- Alberta Transplant Institute, Edmonton, Alberta, Canada; Department of Surgery, University of Alberta, Edmonton, Alberta, Canada; Department of Oncology, University of Alberta, Edmonton, Alberta, Canada
| | | | - Lori West
- Alberta Transplant Institute, Edmonton, Alberta, Canada; Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada
| | - Colin C Anderson
- Alberta Transplant Institute, Edmonton, Alberta, Canada; Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
| | - Gavin Y Oudit
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada; UCL Cancer Institute, University College London, London, England, UK; Mazankowski Alberta Heart Institute, Edmonton, Alberta, Canada
| | - Allan G Murray
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada; Alberta Transplant Institute, Edmonton, Alberta, Canada.
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8
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Targeting Class I-II-III PI3Ks in Cancer Therapy: Recent Advances in Tumor Biology and Preclinical Research. Cancers (Basel) 2023; 15:cancers15030784. [PMID: 36765741 PMCID: PMC9913247 DOI: 10.3390/cancers15030784] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/15/2023] [Accepted: 01/17/2023] [Indexed: 02/01/2023] Open
Abstract
Phosphatidylinositol-3-kinase (PI3K) enzymes, producing signaling phosphoinositides at plasma and intracellular membranes, are key in intracellular signaling and vesicular trafficking pathways. PI3K is a family of eight enzymes divided into three classes with various functions in physiology and largely deregulated in cancer. Here, we will review the recent evidence obtained during the last 5 years on the roles of PI3K class I, II and III isoforms in tumor biology and on the anti-tumoral action of PI3K inhibitors in preclinical cancer models. The dependency of tumors to PI3K isoforms is dictated by both genetics and context (e.g., the microenvironment). The understanding of class II/III isoforms in cancer development and progression remains scarce. Nonetheless, the limited available data are consistent and reveal that there is an interdependency between the pathways controlled by all PI3K class members in their role to promote cancer cell proliferation, survival, growth, migration and metabolism. It is unknown whether this feature contributes to partial treatment failure with isoform-selective PI3K inhibitors. Hence, a better understanding of class II/III functions to efficiently inhibit their positive and negative interactions with class I PI3Ks is needed. This research will provide the proof-of-concept to develop combination treatment strategies targeting several PI3K isoforms simultaneously.
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9
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Xu J, Cao J, Tan B, Xie S. G protein-coupled bile acid receptor 1 reduced hepatic immune response and inhibited NFκB, PI3K/AKT, and PKC/P38 MAPK signaling pathway in hybrid grouper. J Anim Sci 2023; 101:skad307. [PMID: 37715969 PMCID: PMC10576523 DOI: 10.1093/jas/skad307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Accepted: 09/15/2023] [Indexed: 09/18/2023] Open
Abstract
The mammalian G protein-coupled bile acid receptor 1 (TGR5) is involved in the inflammatory response. However, the functions of TGR5 in the immune response of fish remain unclear. In this study, the full-length sequence of tgr5 from hybrid grouper (Epinephelus fuscoguttatus ♀ × E. lanceolatus ♂) was cloned, and the function of TGR5 in the immune response was explored. The results showed that the ORF of tgr5 gene in hybrid grouper was 1029 bp and encoded 342 amino acids. Activation of TGR5 by INT-777 significantly decreased the activities and mRNA expression of TNFα and IL1β, whereas inhibition of TGR5 by SBI-115 showed the opposite effect. SBI-115 treatment significantly increased the expression of phosphorylated inhibitor κB α (p-IKBα) protein. After the INT-777 treatment, the concentration of protein kinase C (PKC) and expression of the p38 mitogen-activated protein kinases (p38a), p38b and p38c, were significantly decreased in vivo. INT-777 agonist significantly decreased the expression of phosphorylated phosphoinositide 3-kinase (p-PI3K) protein and the ratio of phosphorylated and nonphosphorylated serine/threonine-protein kinase (p-AKT/AKT). In conclusion, activation of hepatic TGR5 inhibited the PKC/P38 MAPK, PI3K/AKT, NFκB signaling pathway and improved hepatic immune responses of hybrid grouper in vivo and in vitro.
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Affiliation(s)
- Jia Xu
- Laboratory of Aquatic Animal Nutrition and Feed, Fisheries College, Guangdong Ocean University, Zhanjiang, China
- Guangxi Key Laboratory of Marine Environmental Science, Guangxi Academy of Marine Sciences, Guangxi Academy of Sciences, Nanning, China
| | - Junming Cao
- Laboratory of Aquatic Animal Nutrition and Feed, Fisheries College, Guangdong Ocean University, Zhanjiang, China
- Key Laboratory of Aquatic, Livestock and Poultry Feed Science and Technology in South China, Ministry of Agriculture, Zhanjiang, China
- Aquatic Animals Precision Nutrition and High Efficiency Feed Engineering Research Center of Guangdong Province, Zhanjiang, China
| | - Beiping Tan
- Laboratory of Aquatic Animal Nutrition and Feed, Fisheries College, Guangdong Ocean University, Zhanjiang, China
- Aquatic Animals Precision Nutrition and High Efficiency Feed Engineering Research Center of Guangdong Province, Zhanjiang, China
| | - Shiwei Xie
- Laboratory of Aquatic Animal Nutrition and Feed, Fisheries College, Guangdong Ocean University, Zhanjiang, China
- Key Laboratory of Aquatic, Livestock and Poultry Feed Science and Technology in South China, Ministry of Agriculture, Zhanjiang, China
- Aquatic Animals Precision Nutrition and High Efficiency Feed Engineering Research Center of Guangdong Province, Zhanjiang, China
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10
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Sánchez-Castillo C, Cuartero MI, Fernández-Rodrigo A, Briz V, López-García S, Jiménez-Sánchez R, López JA, Graupera M, Esteban JA. Functional specialization of different PI3K isoforms for the control of neuronal architecture, synaptic plasticity, and cognition. SCIENCE ADVANCES 2022; 8:eabq8109. [PMID: 36417513 PMCID: PMC9683729 DOI: 10.1126/sciadv.abq8109] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Neuronal connectivity and activity-dependent synaptic plasticity are fundamental properties that support brain function and cognitive performance. Phosphatidylinositol 3-kinase (PI3K) intracellular signaling controls multiple mechanisms mediating neuronal growth, synaptic structure, and plasticity. However, it is still unclear how these pleiotropic functions are integrated at molecular and cellular levels. To address this issue, we used neuron-specific virally delivered Cre expression to delete either p110α or p110β (the two major catalytic isoforms of type I PI3K) from the hippocampus of adult mice. We found that dendritic and postsynaptic structures are almost exclusively supported by p110α activity, whereas p110β controls neurotransmitter release and metabotropic glutamate receptor-dependent long-term depression at the presynaptic terminal. In addition to these separate functions, p110α and p110β jointly contribute to N-methyl-d-aspartate receptor-dependent postsynaptic long-term potentiation. This molecular and functional specialization is reflected in different proteomes controlled by each isoform and in distinct behavioral alterations for learning/memory and sociability in mice lacking p110α or p110β.
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Affiliation(s)
- Carla Sánchez-Castillo
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - María I. Cuartero
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - Alba Fernández-Rodrigo
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - Víctor Briz
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - Sergio López-García
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - Raquel Jiménez-Sánchez
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
| | - Juan A. López
- Proteomics Unit, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV), Instituto de Salud Carlos III, Madrid, Spain
| | - Mariona Graupera
- Endothelial Pathobiology and Microenviroment Group, Josep Carreras Leukaemia Research Institute (IJC), 08916 Badalona, Barcelona, Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Instituto de Salud Carlos III, Madrid, Spain
| | - José A. Esteban
- Department of Molecular Neuropathology, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid, Spain
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11
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Wissmann S, Stolp B, Jímenez AM, Stein JV. DOCK2 and phosphoinositide-3 kinase δ mediate two complementary signaling pathways for CXCR5-dependent B cell migration. Front Immunol 2022; 13:982383. [PMID: 36341455 PMCID: PMC9627044 DOI: 10.3389/fimmu.2022.982383] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 09/29/2022] [Indexed: 01/12/2024] Open
Abstract
Naive B cells use the chemokine receptor CXCR5 to enter B cell follicles, where they scan CXCL13-expressing ICAM-1+ VCAM-1+ follicular dendritic cells (FDCs) for the presence of antigen. CXCL13-CXCR5-mediated motility is mainly driven by the Rac guanine exchange factor DOCK2, which contains a binding domain for phosphoinositide-3,4,5-triphosphate (PIP3) and other phospholipids. While p110δ, the catalytic subunit of the class IA phosphoinositide-3-kinase (PI3K) δ, contributes to CXCR5-mediated B cell migration, the precise interdependency of DOCK2, p110δ, or other PI3K family members during this process remains incompletely understood. Here, we combined in vitro chemotaxis assays and in vivo imaging to examine the contribution of these two factors during murine naïve B cell migration to CXCL13. Our data confirm that p110δ is the main catalytic subunit mediating PI3K-dependent migration downstream CXCR5, whereas it does not contribute to chemotaxis triggered by CXCR4 or CCR7, two other chemokine receptors expressed on naïve B cells. The contribution of p110δ activity to CXCR5-driven migration was complementary to that of DOCK2, and pharmacological or genetic interference with both pathways completely abrogated B cell chemotaxis to CXCL13. Intravital microscopy of control and gene-deficient B cells migrating on FDCs confirmed that lack of DOCK2 caused a profound migration defect, whereas p110δ contributed to cell speed and directionality. B cells lacking active p110δ also displayed defective adhesion to ICAM-1; yet, their migration impairment was maintained on ICAM-1-deficient FDCs. In sum, our data uncover two complementary signaling pathways mediated by DOCK2 and p110δ, which enable CXCR5-driven naïve B cell examination of FDCs.
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Affiliation(s)
- Stefanie Wissmann
- Department of Oncology, Microbiology and Immunology, University of Fribourg, Fribourg, Switzerland
| | - Bettina Stolp
- Department for Infectious Diseases, Integrative Virology, Center for Integrative Infectious Disease Research, University Hospital Heidelberg, Heidelberg, Germany
| | - Ana Marcos Jímenez
- Department of Immunology, Biomedical Research Institute La Princesa Hospital, Madrid, Spain
| | - Jens V. Stein
- Department of Oncology, Microbiology and Immunology, University of Fribourg, Fribourg, Switzerland
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12
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Menko AS, Walker JL. The Pro-Fibrotic Response to Lens Injury Is Signaled in a PI3K Isoform-Specific Manner. Biomolecules 2022; 12:1181. [PMID: 36139020 PMCID: PMC9496593 DOI: 10.3390/biom12091181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Revised: 08/18/2022] [Accepted: 08/23/2022] [Indexed: 12/11/2022] Open
Abstract
The signaling inputs that function to integrate biochemical and mechanical cues from the extracellular environment to alter the wound-repair outcome to a fibrotic response remain poorly understood. Here, using a clinically relevant post-cataract surgery wound healing/fibrosis model, we investigated the role of Phosphoinositide-3-kinase (PI3K) class I isoforms as potential signaling integrators to promote the proliferation, emergence and persistence of collagen I-producing alpha smooth muscle actin (αSMA+) myofibroblasts that cause organ fibrosis. Using PI3K isoform specific small molecule inhibitors, our studies revealed a requisite role for PI3K p110α in signaling the CD44+ mesenchymal leader cell population that we previously identified as resident immune cells to produce and organize a fibronectin-EDA rich provisional matrix and transition to collagen I-producing αSMA+ myofibroblasts. While the PI3K effector Akt was alone insufficient to regulate myofibroblast differentiation, our studies revealed a role for Rac, another potential PI3K effector, in this process. Our studies further uncovered a critical role for PI3K p110α in signaling the proliferation of CD44+ leader cells, which is important to the emergence and expansion of myofibroblasts. Thus, these studies identify activation of PI3K p110α as a critical signaling input following wounding to the development and progression of fibrotic disease.
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Affiliation(s)
- A. Sue Menko
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
- Department of Ophthalmology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Janice L. Walker
- Department of Pathology, Anatomy and Cell Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
- Department of Ophthalmology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
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13
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Agnetti J, Bou Malham V, Desterke C, Benzoubir N, Peng J, Jacques S, Rahmouni S, Di Valentin E, Tan TZ, Samuel D, Thiery JP, Gassama-Diagne A. PI3Kδ activity controls plasticity and discriminates between EMT and stemness based on distinct TGFβ signaling. Commun Biol 2022; 5:740. [PMID: 35879421 PMCID: PMC9314410 DOI: 10.1038/s42003-022-03637-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 06/24/2022] [Indexed: 11/08/2022] Open
Abstract
The stem cells involved in formation of the complex human body are epithelial cells that undergo apicobasal polarization and form a hollow lumen. Epithelial plasticity manifests as epithelial to mesenchymal transition (EMT), a process by which epithelial cells switch their polarity and epithelial features to adopt a mesenchymal phenotype. The connection between the EMT program and acquisition of stemness is now supported by a substantial number of reports, although what discriminates these two processes remains largely elusive. In this study, based on 3D organoid culture of hepatocellular carcinoma (HCC)-derived cell lines and AAV8-based protein overexpression in the mouse liver, we show that activity modulation of isoform δ of phosphoinositide 3-kinase (PI3Kδ) controls differentiation and discriminates between stemness and EMT by regulating the transforming growth factor β (TGFβ) signaling. This study provides an important tool to control epithelial cell fate and represents a step forward in understanding the development of aggressive carcinoma.
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Affiliation(s)
- Jean Agnetti
- INSERM, Unité 1193, Villejuif, F-94800, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France
| | - Vanessa Bou Malham
- INSERM, Unité 1193, Villejuif, F-94800, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France
| | | | - Nassima Benzoubir
- INSERM, Unité 1193, Villejuif, F-94800, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France
| | - Juan Peng
- INSERM, Unité 1193, Villejuif, F-94800, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France
| | - Sophie Jacques
- Laboratory of animal Genomics, GIGA-Medical Genomics, GIGA-institute, Université de Liège, Liège, Belgium
| | - Souad Rahmouni
- Laboratory of animal Genomics, GIGA-Medical Genomics, GIGA-institute, Université de Liège, Liège, Belgium
| | - Emanuel Di Valentin
- Plateforme des vecteurs viraux, GIGA B34, GIGA-institute, Université de Liège, Liège, Belgium
| | - Tuan Zea Tan
- Cancer Science Institute of Singapore National University of Singapore, Center for Translational Medicine, 14 Medical Drive, #12-01, 117599, Singapore, Singapore
| | - Didier Samuel
- INSERM, Unité 1193, Villejuif, F-94800, France
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France
- AP-HP Hôpital Paul Brousse, Centre Hepato-Biliaire, F-94800, Villejuif, France
| | - Jean Paul Thiery
- Guangzhou Laboratory, International biological Island Guangzhou, 510005, Guangzhou, China
| | - Ama Gassama-Diagne
- INSERM, Unité 1193, Villejuif, F-94800, France.
- Université Paris-Saclay, UMR-S 1193, Villejuif, F-94800, France.
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14
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Class I PI3K regulatory subunits control differentiation of dendritic cell subsets and regulate Flt3L mediated signal transduction. Sci Rep 2022; 12:12311. [PMID: 35853935 PMCID: PMC9296662 DOI: 10.1038/s41598-022-16548-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 07/12/2022] [Indexed: 11/18/2022] Open
Abstract
Dendritic cells (DCs) play pivotal roles in initiating and shaping both innate and adaptive immune responses. The spatiotemporal expression of transcription factor networks and activation of specific signal transduction pathways determine the specification, distribution and differentiation of DC subsets. Even though pioneering studies have established indispensable roles for specific catalytic subunits (p110δ and p110γ) in immune cells, functions of the regulatory subunits, particularly of Class I PI3K, within the hematopoietic system remain incompletely understood. In the study presented here, we deleted the key regulatory subunits—p85α and p85β of the Class IA PI3K in hematopoietic cells and studied its impact on DC differentiation. Our studies identify that a deficiency of p85 causes increased differentiation of conventional DC (cDC) 2 and plasmacytoid DC (pDC) subsets in the spleen. On the other hand, DC numbers in the bone marrow (BM), thymus and lymph nodes were decreased in p85 mutant mice. Analysis of DC-specific progenitors and precursors indicated increased numbers in the BM and spleen of p85 deficient mice. In-vitro differentiation studies demonstrated augmented DC-differentiation capacities of p85 deficient BM cells in the presence of GM-CSF and Flt3L. BM chimera studies established that p85 deficiency affects DC development through cell intrinsic mechanisms. Molecular studies revealed increased proliferation of DCs and common DC progenitors (CDPs) in the absence of p85 and altered signal transduction pathways in p85 mutant DC subsets in response to Flt3L. In essence, data presented here, for the first time, unequivocally establish that the P85α subunit of class IA PI3Ks has an indispensable role in the development and maintenance of DCs.
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15
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Zhou H, Wang L, Liu S, Wang W. The role of phosphoinositide 3-kinases in immune-inflammatory responses: potential therapeutic targets for abdominal aortic aneurysm. Cell Cycle 2022; 21:2339-2364. [PMID: 35792922 DOI: 10.1080/15384101.2022.2094577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The pathogenesis of abdominal aortic aneurysm (AAA) includes inflammatory responses, matrix metalloproteinases (MMPs) degradation, VSMC apoptosis, oxidative stress, and angiogenesis, among which the inflammatory response plays a key role. At present, surgery is the only curing treatment, and no effective drug can delay AAA progression in clinical practice. Therefore, searching for a signaling pathway related to the immune-inflammatory response is an essential direction for developing drugs targeting AAA. Recent studies have confirmed that the PI3K family plays an important role in many inflammatory diseases and is involved in regulating various cellular functions, especially in the immune-inflammatory response. This review focuses on the role of each isoform of PI3K in each stage of AAA immune-inflammatory response, making available explorations for a deeper understanding of the mechanism of inflammation and immune response during the formation and development of AAA.
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Affiliation(s)
- Haiyang Zhou
- Department of General &vascular Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Lei Wang
- Department of General &vascular Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Shuai Liu
- Department of General &vascular Surgery, Xiangya Hospital, Central South University, Changsha, China
| | - Wei Wang
- Department of General &vascular Surgery, Xiangya Hospital, Central South University, Changsha, China
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16
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Tariq K, Luikart BW. Striking a balance: PIP 2 and PIP 3 signaling in neuronal health and disease. EXPLORATION OF NEUROPROTECTIVE THERAPY 2022; 1:86-100. [PMID: 35098253 PMCID: PMC8797975 DOI: 10.37349/ent.2021.00008] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Phosphoinositides are membrane phospholipids involved in a variety of cellular processes like growth, development, metabolism, and transport. This review focuses on the maintenance of cellular homeostasis of phosphatidylinositol 4,5-bisphosphate (PIP2), and phosphatidylinositol 3,4,5-trisphosphate (PIP3). The critical balance of these PIPs is crucial for regulation of neuronal form and function. The activity of PIP2 and PIP3 can be regulated through kinases, phosphatases, phospholipases and cholesterol microdomains. PIP2 and PIP3 carry out their functions either indirectly through their effectors activating integral signaling pathways, or through direct regulation of membrane channels, transporters, and cytoskeletal proteins. Any perturbations to the balance between PIP2 and PIP3 signaling result in neurodevelopmental and neurodegenerative disorders. This review will discuss the upstream modulators and downstream effectors of the PIP2 and PIP3 signaling, in the context of neuronal health and disease.
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Affiliation(s)
- Kamran Tariq
- Department of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Bryan W Luikart
- Department of Molecular and Systems Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
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17
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Abstract
Macropinocytosis is a critical route of nutrient acquisition in pancreatic cancer cells. Constitutive macropinocytosis is promoted by mutant KRAS, which activates the PI3Kα lipid kinase and RAC1, to drive membrane ruffling, macropinosome uptake and processing. However, our recent study on the KRASG12R mutant indicated the presence of a KRAS-independent mode of macropinocytosis in pancreatic cancer cell lines, thereby increasing the complexity of this process. We found that KRASG12R-mutant cell lines promote macropinocytosis independent of KRAS activity using PI3Kγ and RAC1, highlighting the convergence of regulation on RAC signaling. While macropinocytosis has been proposed to be a therapeutic target for the treatment of pancreatic cancer, our studies have underscored how little we understand about the activation and regulation of this metabolic process. Therefore, this review seeks to highlight the differences in macropinocytosis regulation in the two cellular subtypes while also highlighting the features that make the KRASG12R mutant atypical.
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Affiliation(s)
- G Aaron Hobbs
- Department of Cell and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, SC, USA.
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, USA.
| | - Channing J Der
- Department of Pharmacology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
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18
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PI3K and AKT at the Interface of Signaling and Metabolism. Curr Top Microbiol Immunol 2022; 436:311-336. [DOI: 10.1007/978-3-031-06566-8_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Class I PI3K Biology. Curr Top Microbiol Immunol 2022; 436:3-49. [DOI: 10.1007/978-3-031-06566-8_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Pungsrinont T, Kallenbach J, Baniahmad A. Role of PI3K-AKT-mTOR Pathway as a Pro-Survival Signaling and Resistance-Mediating Mechanism to Therapy of Prostate Cancer. Int J Mol Sci 2021; 22:11088. [PMID: 34681745 PMCID: PMC8538152 DOI: 10.3390/ijms222011088] [Citation(s) in RCA: 79] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/27/2021] [Accepted: 10/11/2021] [Indexed: 12/12/2022] Open
Abstract
Androgen deprivation therapy (ADT) and androgen receptor (AR)-targeted therapy are the gold standard options for treating prostate cancer (PCa). These are initially effective, as localized and the early stage of metastatic disease are androgen- and castration-sensitive. The tumor strongly relies on systemic/circulating androgens for activating AR signaling to stimulate growth and progression. However, after a certain point, the tumor will eventually develop a resistant stage, where ADT and AR antagonists are no longer effective. Mechanistically, it seems that the tumor becomes more aggressive through adaptive responses, relies more on alternative activated pathways, and is less dependent on AR signaling. This includes hyperactivation of PI3K-AKT-mTOR pathway, which is a central signal that regulates cell pro-survival/anti-apoptotic pathways, thus, compensating the blockade of AR signaling. The PI3K-AKT-mTOR pathway is well-documented for its crosstalk between genomic and non-genomic AR signaling, as well as other signaling cascades. Such a reciprocal feedback loop makes it more complicated to target individual factor/signaling for treating PCa. Here, we highlight the role of PI3K-AKT-mTOR signaling as a resistance mechanism for PCa therapy and illustrate the transition of prostate tumor from AR signaling-dependent to PI3K-AKT-mTOR pathway-dependent. Moreover, therapeutic strategies with inhibitors targeting the PI3K-AKT-mTOR signal used in clinic and ongoing clinical trials are discussed.
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Affiliation(s)
| | | | - Aria Baniahmad
- Institute of Human Genetics, Jena University Hospital, 07747 Jena, Germany; (T.P.); (J.K.)
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21
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Cintas C, Douche T, Dantes Z, Mouton-Barbosa E, Bousquet MP, Cayron C, Therville N, Pont F, Ramos-Delgado F, Guyon C, Garmy-Susini B, Cappello P, Burlet-Schiltz O, Hirsch E, Gomez-Brouchet A, Thibault B, Reichert M, Guillermet-Guibert J. Phosphoproteomics Identifies PI3K Inhibitor-selective Adaptive Responses in Pancreatic Cancer Cell Therapy and Resistance. Mol Cancer Ther 2021; 20:2433-2445. [PMID: 34552006 DOI: 10.1158/1535-7163.mct-20-0981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 05/28/2021] [Accepted: 09/14/2021] [Indexed: 11/16/2022]
Abstract
The PI3K pathway is highly active in human cancers. The four class I isoforms of PI3K are activated by distinct mechanisms leading to a common downstream signaling. Their downstream redundancy is thought to be responsible for treatment failures of PI3K inhibitors. We challenged this concept, by mapping the differential phosphoproteome evolution in response to PI3K inhibitors with different isoform-selectivity patterns in pancreatic cancer, a disease currently without effective therapy. In this cancer, the PI3K signal was shown to control cell proliferation. We compared the effects of LY294002 that inhibit with equal potency all class I isoenzymes and downstream mTOR with the action of inhibitors with higher isoform selectivity toward PI3Kα, PI3Kβ, or PI3Kγ (namely, A66, TGX-221 and AS-252424). A bioinformatics global pathway analysis of phosphoproteomics data allowed us to identify common and specific signals activated by PI3K inhibitors supported by the biological data. AS-252424 was the most effective treatment and induced apoptotic pathway activation as well as the highest changes in global phosphorylation-regulated cell signal. However, AS-252424 treatment induced reactivation of Akt, therefore decreasing the treatment outcome on cell survival. Reversely, AS-252424 and A66 combination treatment prevented p-Akt reactivation and led to synergistic action in cell lines and patient organoids. The combination of clinically approved α-selective BYL-719 with γ-selective IPI-549 was more efficient than single-molecule treatment on xenograft growth. Mapping unique adaptive signaling responses to isoform-selective PI3K inhibition will help to design better combinative treatments that prevent the induction of selective compensatory signals.
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Affiliation(s)
- Célia Cintas
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Thibault Douche
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Zahra Dantes
- Klinik und Poliklinik für Innere Medizin II, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.,Center for Protein Assemblies (CPA), Technische Universität München, Garching, Germany.,German Cancer Consortium (DKTK), partner site Munich, Germany
| | - Emmanuelle Mouton-Barbosa
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS UMR 5089, UPS, Toulouse, France
| | - Marie-Pierre Bousquet
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS UMR 5089, UPS, Toulouse, France
| | - Coralie Cayron
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Nicole Therville
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Frédéric Pont
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France
| | - Fernanda Ramos-Delgado
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Camille Guyon
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | | | - Paola Cappello
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy.,Molecular Biotechnology Center (MBC), Turin, Italy
| | - Odile Burlet-Schiltz
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS UMR 5089, UPS, Toulouse, France
| | - Emilio Hirsch
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy.,Molecular Biotechnology Center (MBC), Turin, Italy
| | - Anne Gomez-Brouchet
- IUCT-O, Institut Claudius Regaud, Hopitaux de Toulouse, Biobank, Toulouse, France
| | - Benoît Thibault
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France.,Labex TouCAN, Toulouse, France
| | - Maximilian Reichert
- Klinik und Poliklinik für Innere Medizin II, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany.,Center for Protein Assemblies (CPA), Technische Universität München, Garching, Germany.,German Cancer Consortium (DKTK), partner site Munich, Germany
| | - Julie Guillermet-Guibert
- INSERM, CNRS, Université Paul Sabatier, U1037, CRCT, Toulouse, France. .,Labex TouCAN, Toulouse, France
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22
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Chen X, Zhabyeyev P, Azad AK, Vanhaesebroeck B, Grueter CE, Murray AG, Kassiri Z, Oudit GY. Pharmacological and cell-specific genetic PI3Kα inhibition worsens cardiac remodeling after myocardial infarction. J Mol Cell Cardiol 2021; 157:17-30. [PMID: 33887328 DOI: 10.1016/j.yjmcc.2021.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND PI3Kα (Phosphoinositide 3-kinase α) regulates multiple downstream signaling pathways controlling cell survival, growth, and proliferation and is an attractive therapeutic target in cancer and obesity. The clinically-approved PI3Kα inhibitor, BYL719, is in further clinical trials for cancer and overgrowth syndrome. However, the potential impact of PI3Kα inhibition on the heart and following myocardial infarction (MI) is unclear. We aim to determine whether PI3Kα inhibition affects cardiac physiology and post-MI remodeling and to elucidate the underlying molecular mechanisms. METHODS AND RESULTS Wildtype (WT) 12-wk old male mice receiving BYL719 (daily, p.o.) for 10 days showed reduction in left ventricular longitudinal strain with normal ejection fraction, weight loss, mild cardiac atrophy, body composition alteration, and prolonged QTC interval. RNASeq analysis showed gene expression changes in multiple pathways including extracellular matrix remodeling and signaling complexes. After MI, both p110α and phospho-Akt protein levels were increased in human and mouse hearts. Pharmacological PI3Kα inhibition aggravated cardiac dysfunction and resulted in adverse post-MI remodeling, with increased apoptosis, elevated inflammation, suppressed hypertrophy, decreased coronary blood vessel density, and inhibited Akt/GSK3β/eNOS signaling. Selective genetic ablation of PI3Kα in endothelial cells was associated with worsened post-MI cardiac function and reduced coronary blood vessel density. In vitro, BYL719 suppressed Akt/eNOS activation, cell viability, proliferation, and angiogenic sprouting in coronary and human umbilical vein endothelial cells. Cardiomyocyte-specific genetic PI3Kα ablation resulted in mild cardiac systolic dysfunction at baseline. After MI, cardiac function markedly deteriorated with increased mortality concordant with greater apoptosis and reduced hypertrophy. In isolated adult mouse cardiomyocytes, BYL719 decreased hypoxia-associated activation of Akt/GSK3β signaling and cell survival. CONCLUSIONS PI3Kα is required for cell survival (endothelial cells and cardiomyocytes) hypertrophic response, and angiogenesis to maintain cardiac function after MI. Therefore, PI3Kα inhibition that is used as anti-cancer treatment, can be cardiotoxic, especially after MI.
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Affiliation(s)
- Xueyi Chen
- Department of Medicine, University of Alberta, Edmonton, Canada; Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada
| | - Pavel Zhabyeyev
- Department of Medicine, University of Alberta, Edmonton, Canada; Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada
| | - Abul K Azad
- Department of Medicine, University of Alberta, Edmonton, Canada
| | | | - Chad E Grueter
- Division of Cardiovascular Medicine, Department of Internal Medicine, Francois M. Abboud Cardiovascular Research Center, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA, USA
| | - Allan G Murray
- Department of Medicine, University of Alberta, Edmonton, Canada
| | - Zamaneh Kassiri
- Department of Physiology, University of Alberta, Edmonton, Canada; Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada
| | - Gavin Y Oudit
- Department of Medicine, University of Alberta, Edmonton, Canada; Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Canada.
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Cuesta C, Arévalo-Alameda C, Castellano E. The Importance of Being PI3K in the RAS Signaling Network. Genes (Basel) 2021; 12:1094. [PMID: 34356110 PMCID: PMC8303222 DOI: 10.3390/genes12071094] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/06/2021] [Accepted: 07/16/2021] [Indexed: 12/12/2022] Open
Abstract
Ras proteins are essential mediators of a multitude of cellular processes, and its deregulation is frequently associated with cancer appearance, progression, and metastasis. Ras-driven cancers are usually aggressive and difficult to treat. Although the recent Food and Drug Administration (FDA) approval of the first Ras G12C inhibitor is an important milestone, only a small percentage of patients will benefit from it. A better understanding of the context in which Ras operates in different tumor types and the outcomes mediated by each effector pathway may help to identify additional strategies and targets to treat Ras-driven tumors. Evidence emerging in recent years suggests that both oncogenic Ras signaling in tumor cells and non-oncogenic Ras signaling in stromal cells play an essential role in cancer. PI3K is one of the main Ras effectors, regulating important cellular processes such as cell viability or resistance to therapy or angiogenesis upon oncogenic Ras activation. In this review, we will summarize recent advances in the understanding of Ras-dependent activation of PI3K both in physiological conditions and cancer, with a focus on how this signaling pathway contributes to the formation of a tumor stroma that promotes tumor cell proliferation, migration, and spread.
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Affiliation(s)
| | | | - Esther Castellano
- Tumour-Stroma Signalling Laboratory, Centro de Investigación del Cáncer, Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Salamanca, Campus Miguel de Unamuno, 37007 Salamanca, Spain; (C.C.); (C.A.-A.)
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24
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Role of PI3K/Akt signaling pathway in cardiac fibrosis. Mol Cell Biochem 2021; 476:4045-4059. [PMID: 34244974 DOI: 10.1007/s11010-021-04219-w] [Citation(s) in RCA: 99] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 06/29/2021] [Indexed: 12/26/2022]
Abstract
Heart failure (HF) is considered as a severe health problem worldwide, while cardiac fibrosis is one of the main driving factors for the progress of HF. Cardiac fibrosis was characterized by changes in cardiomyocytes, cardiac fibroblasts, ratio of collagen (COL) I/III, and the excessive production and deposition of extracellular matrix (ECM), thus forming a scar tissue, which leads to pathological process of cardiac structural changes and systolic as well as diastolic dysfunction. Cardiac fibrosis is a common pathological change of many advanced cardiovascular diseases including ischemic heart disease, hypertension, and HF. Accumulated studies have proven that phosphoinositol-3 kinase (PI3K)/Akt signaling pathway is involved in regulating the occurrence, progression and pathological formation of cardiac fibrosis via regulating cell survival, apoptosis, growth, cardiac contractility and even the transcription of related genes through a series of molecules including mammalian target of rapamycin (mTOR), glycogen synthase kinase 3 (GSK-3), forkhead box proteins O1/3 (FoxO1/3), and nitric oxide synthase (NOS). Thus, the review focuses on the role of PI3K/Akt signaling pathway in the cardiac fibrosis. The information reviewed here should be significant in understanding the role of PI3K/Akt in cardiac fibrosis and contribute to the design of further studies related to PI3K/Akt and the cardiac fibrotic response, as well as sought to shed light on a potential treatment for cardiac fibrosis.
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25
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Di-Luoffo M, Ben-Meriem Z, Lefebvre P, Delarue M, Guillermet-Guibert J. PI3K functions as a hub in mechanotransduction. Trends Biochem Sci 2021; 46:878-888. [PMID: 34112586 DOI: 10.1016/j.tibs.2021.05.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 04/22/2021] [Accepted: 05/12/2021] [Indexed: 01/18/2023]
Abstract
Mammalian cells integrate different types of stimuli that govern their fate. These stimuli encompass biochemical as well as biomechanical cues (shear, tensile, and compressive stresses) that are usually studied separately. The phosphatidylinositol 3-kinase (PI3K) enzymes, producing signaling phosphoinositides at plasma and intracellular membranes, are key in intracellular signaling and vesicular trafficking pathways. Recent evidence in cancer research demonstrates that these enzymes are essential in mechanotransduction. Despite this, the importance of the integration of biomechanical cues and PI3K-driven biochemical signals is underestimated. In this opinion article, we make the hypothesis that modeling of biomechanical cues is critical to understand PI3K oncogenicity. We also identify known/missing knowledge in terms of isoform specificity and molecular pathways of activation, knowledge that is needed for clinical applications.
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Affiliation(s)
- M Di-Luoffo
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Université de Toulouse, Institut National de la Santé et de la Recherche Médicale (Inserm) U1037, Centre National de la Recherche Scientifique (CNRS) U5071, Toulouse, France; Laboratoire D'analyse et D'architectures Des Systems (LAAS)-CNRS (Centre National de la Recherche Scientifique), Toulouse, France
| | - Z Ben-Meriem
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Université de Toulouse, Institut National de la Santé et de la Recherche Médicale (Inserm) U1037, Centre National de la Recherche Scientifique (CNRS) U5071, Toulouse, France; Laboratoire D'analyse et D'architectures Des Systems (LAAS)-CNRS (Centre National de la Recherche Scientifique), Toulouse, France
| | - P Lefebvre
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Université de Toulouse, Institut National de la Santé et de la Recherche Médicale (Inserm) U1037, Centre National de la Recherche Scientifique (CNRS) U5071, Toulouse, France; Laboratoire D'analyse et D'architectures Des Systems (LAAS)-CNRS (Centre National de la Recherche Scientifique), Toulouse, France
| | - M Delarue
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Université de Toulouse, Institut National de la Santé et de la Recherche Médicale (Inserm) U1037, Centre National de la Recherche Scientifique (CNRS) U5071, Toulouse, France; Laboratoire D'analyse et D'architectures Des Systems (LAAS)-CNRS (Centre National de la Recherche Scientifique), Toulouse, France
| | - J Guillermet-Guibert
- Centre de Recherches en Cancérologie de Toulouse (CRCT), Université de Toulouse, Institut National de la Santé et de la Recherche Médicale (Inserm) U1037, Centre National de la Recherche Scientifique (CNRS) U5071, Toulouse, France; TouCAN (Laboratoire d'Excellence Toulouse Cancer), Toulouse, France.
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26
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Shapiro LP, Pitts EG, Li DC, Barbee BR, Hinton EA, Bassell GJ, Gross C, Gourley SL. The PI3-Kinase p110β Isoform Controls Severity of Cocaine-Induced Sequelae and Alters the Striatal Transcriptome. Biol Psychiatry 2021; 89:959-969. [PMID: 33773752 PMCID: PMC8202243 DOI: 10.1016/j.biopsych.2021.01.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 01/04/2021] [Accepted: 01/13/2021] [Indexed: 12/15/2022]
Abstract
BACKGROUND The PI3-kinase (PI3K) complex is a well-validated target for mitigating cocaine-elicited sequelae, but pan-PI3K inhibitors are not viable long-term treatment options. The PI3K complex is composed of p110 catalytic and regulatory subunits, which can be individually manipulated for therapeutic purposes. However, this possibility has largely not been explored in behavioral contexts. METHODS Here, we inhibited PI3K p110β in the medial prefrontal cortex (mPFC) of cocaine-exposed mice. Behavioral models for studying relapse, sensitization, and decision-making biases were paired with protein quantification, RNA sequencing, and cell type-specific chemogenetic manipulation and RNA quantification to determine whether and how inhibiting PI3K p110β confers resilience to cocaine. RESULTS Viral-mediated PI3K p110β silencing reduced cue-induced reinstatement of cocaine seeking by half, blocked locomotor sensitization, and restored mPFC synaptic marker content after exposure to cocaine. Cocaine blocked the ability of mice to select actions based on their consequences, and p110β inhibition restored this ability. Silencing dopamine D2 receptor-expressing excitatory mPFC neurons mimicked cocaine, impairing goal-seeking behavior, and again, p110β inhibition restored goal-oriented action. We verified the presence of p110β in mPFC neurons projecting to the dorsal striatum and orbitofrontal cortex and found that inhibiting p110β in the mPFC altered the expression of functionally defined gene clusters within the dorsal striatum and not orbitofrontal cortex. CONCLUSIONS Subunit-selective PI3K silencing potently mitigates drug seeking, sensitization, and decision-making biases after exposure to cocaine. We suggest that inhibiting PI3K p110β provides neuroprotection against cocaine by triggering coordinated corticostriatal adaptations.
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Affiliation(s)
- Lauren P. Shapiro
- Graduate Program in Molecular and Systems Pharmacology, Emory University,Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center
| | - Elizabeth G. Pitts
- Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center,Graduate Program in Neuroscience, Emory University
| | - Dan C. Li
- Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center,Graduate Program in Neuroscience, Emory University
| | - Britton R. Barbee
- Graduate Program in Molecular and Systems Pharmacology, Emory University,Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center
| | - Elizabeth A. Hinton
- Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center,Graduate Program in Neuroscience, Emory University
| | - Gary J. Bassell
- Graduate Program in Neuroscience, Emory University,Department of Cell Biology, Emory University
| | - Christina Gross
- Division of Neurology, Cincinnati Children’s Hospital Medical Center and Department of Pediatrics, University of Cincinnati College of Medicine
| | - Shannon L. Gourley
- Department of Pediatrics, Emory University School of Medicine; Yerkes National Primate Research Center,Graduate Program in Neuroscience, Emory University,Children’s Healthcare of Atlanta
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27
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Cardiovascular toxicity of PI3Kα inhibitors. Clin Sci (Lond) 2021; 134:2595-2622. [PMID: 33063821 DOI: 10.1042/cs20200302] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/27/2020] [Accepted: 09/30/2020] [Indexed: 02/07/2023]
Abstract
The phosphoinositide 3-kinases (PI3Ks) are a family of intracellular lipid kinases that phosphorylate the 3'-hydroxyl group of inositol membrane lipids, resulting in the production of phosphatidylinositol 3,4,5-trisphosphate from phosphatidylinositol 4,5-bisphosphate. This results in downstream effects, including cell growth, proliferation, and migration. The heart expresses three PI3K class I enzyme isoforms (α, β, and γ), and these enzymes play a role in cardiac cellular survival, myocardial hypertrophy, myocardial contractility, excitation, and mechanotransduction. The PI3K pathway is associated with various disease processes but is particularly important to human cancers since many gain-of-function mutations in this pathway occur in various cancers. Despite the development, testing, and regulatory approval of PI3K inhibitors in recent years, there are still significant challenges when creating and utilizing these drugs, including concerns of adverse effects on the heart. There is a growing body of evidence from preclinical studies revealing that PI3Ks play a crucial cardioprotective role, and thus inhibition of this pathway could lead to cardiac dysfunction, electrical remodeling, vascular damage, and ultimately, cardiovascular disease. This review will focus on PI3Kα, including the mechanisms underlying the adverse cardiovascular effects resulting from PI3Kα inhibition and the potential clinical implications of treating patients with these drugs, such as increased arrhythmia burden, biventricular cardiac dysfunction, and impaired recovery from cardiotoxicity. Recommendations for future directions for preclinical and clinical work are made, highlighting the possible role of PI3Kα inhibition in the progression of cancer-related cachexia and female sex and pre-existing comorbidities as independent risk factors for cardiac abnormalities after cancer treatment.
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28
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Organismal roles for the PI3Kα and β isoforms: their specificity, redundancy or cooperation is context-dependent. Biochem J 2021; 478:1199-1225. [DOI: 10.1042/bcj20210004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/16/2021] [Accepted: 02/22/2021] [Indexed: 02/07/2023]
Abstract
PI3Ks are important lipid kinases that produce phosphoinositides phosphorylated in position 3 of the inositol ring. There are three classes of PI3Ks: class I PI3Ks produce PIP3 at plasma membrane level. Although D. melanogaster and C. elegans have only one form of class I PI3K, vertebrates have four class I PI3Ks called isoforms despite being encoded by four different genes. Hence, duplication of these genes coincides with the acquisition of coordinated multi-organ development. Of the class I PI3Ks, PI3Kα and PI3Kβ, encoded by PIK3CA and PIK3CB, are ubiquitously expressed. They present similar putative protein domains and share PI(4,5)P2 lipid substrate specificity. Fifteen years after publication of their first isoform-selective pharmacological inhibitors and genetically engineered mouse models (GEMMs) that mimic their complete and specific pharmacological inhibition, we review the knowledge gathered in relation to the redundant and selective roles of PI3Kα and PI3Kβ. Recent data suggest that, further to their redundancy, they cooperate for the integration of organ-specific and context-specific signal cues, to orchestrate organ development, physiology, and disease. This knowledge reinforces the importance of isoform-selective inhibitors in clinical settings.
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29
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Gjelaj E, Hamel PA. Distinct epithelial-to-mesenchymal transitions induced by PIK3CA H1047R and PIK3CB. J Cell Sci 2021; 134:jcs.248294. [PMID: 33526718 DOI: 10.1242/jcs.248294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 01/13/2021] [Indexed: 02/01/2023] Open
Abstract
The most common PIK3CA mutation, producing the H1047R mutant of p110α, arises in myriad malignancies and is typically observed in low-grade breast tumours. In contrast, amplification is observed for wild-type PIK3CB, encoding p110β, and occurs at low frequency but in aggressive, high-grade metastatic tumours. We hypothesized that mutant p110αH1047R and wild-type p110β give rise to distinct transformed phenotypes. We show that p110αH1047R and wild-type p110β, but not wild-type p110α, transform MCF-10A cells and constitutively stimulate phosphoinositide 3-kinase (PI3K)-AKT pathway signalling. However, their resultant morphological transformed phenotypes are distinct. p110αH1047R induced an epithelial-to-mesenchymal transition (EMT) commensurate with SNAIL (also known as SNAI1) induction and loss of E-cadherin. Upon p110β expression, however, E-cadherin expression was maintained despite cells readily delaminating from epithelial sheets. Distinct from the prominent filopodia in p110αH1047R-expressing cells, p110β induced formation of lamellipodia, and these cells migrated with significantly greater velocity and decreased directionality. p110β-induced phenotypic alterations were accompanied by hyperactivation of RAC1; the dependency of transformation of p110β-binding to Rac1 revealed using a Rac1-binding mutant of p110β. Thus, PIK3CB amplification induces a transformed phenotype that is dependent upon a p110β-Rac1 signalling loop and is distinct from the transformed phenotype induced by p110αH1047R.
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Affiliation(s)
- Ersa Gjelaj
- Department of Laboratory Medicine & Pathobiology, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Paul A Hamel
- Department of Laboratory Medicine & Pathobiology, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
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30
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Mazloumi Gavgani F, Karlsson T, Tangen IL, Morovicz AP, Arnesen VS, Turcu DC, Ninzima S, Spang K, Krakstad C, Guillermet-Guibert J, Lewis AE. Nuclear upregulation of class I phosphoinositide 3-kinase p110β correlates with high 47S rRNA levels in cancer cells. J Cell Sci 2021; 134:jcs.246090. [PMID: 33536247 DOI: 10.1242/jcs.246090] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 12/24/2020] [Indexed: 12/12/2022] Open
Abstract
The class I phosphoinositide 3-kinase (PI3K) catalytic subunits p110α and p110β are ubiquitously expressed but differently targeted in tumours. In cancer, PIK3CB (encoding p110β) is seldom mutated compared with PIK3CA (encoding p110α) but can contribute to tumorigenesis in certain PTEN-deficient tumours. The underlying molecular mechanisms are, however, unclear. We have previously reported that p110β is highly expressed in endometrial cancer (EC) cell lines and at the mRNA level in primary patient tumours. Here, we show that p110β protein levels are high in both the cytoplasmic and nuclear compartments in EC cells. Moreover, high nuclear:cytoplasmic staining ratios were detected in high-grade primary tumours. High levels of phosphatidylinositol (3,4,5)-trisphosphate [PtdIns(3,4,5)P 3] were measured in the nucleus of EC cells, and pharmacological and genetic approaches showed that its production was partly dependent upon p110β activity. Using immunofluorescence staining, p110β and PtdIns(3,4,5)P 3 were localised in the nucleolus, which correlated with high levels of 47S pre-rRNA. p110β inhibition led to a decrease in both 47S rRNA levels and cell proliferation. In conclusion, these results present a nucleolar role for p110β that may contribute to tumorigenesis in EC.This article has an associated First Person interview with Fatemeh Mazloumi Gavgani, joint first author of the paper.
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Affiliation(s)
| | - Thomas Karlsson
- Department of Biological Sciences, University of Bergen, Bergen 5008, Norway
| | - Ingvild L Tangen
- Centre for Cancer Biomarkers, Department of Clinical Science, University of Bergen, Bergen 5021, Norway.,Department of Gynaecology and Obstetrics, Haukeland University Hospital, Bergen 5021, Norway
| | | | | | - Diana C Turcu
- Department of Biological Sciences, University of Bergen, Bergen 5008, Norway
| | - Sandra Ninzima
- Department of Biological Sciences, University of Bergen, Bergen 5008, Norway
| | - Katharina Spang
- Department of Biological Sciences, University of Bergen, Bergen 5008, Norway
| | - Camilla Krakstad
- Centre for Cancer Biomarkers, Department of Clinical Science, University of Bergen, Bergen 5021, Norway.,Department of Gynaecology and Obstetrics, Haukeland University Hospital, Bergen 5021, Norway
| | - Julie Guillermet-Guibert
- Inserm U1037, Centre de Recherches en Cancérologie de Toulouse (CRCT), Institut National de la Santé et de la Recherche Médicale (INSERM), Université Toulouse III Paul Sabatier, 31037 Toulouse, France
| | - Aurélia E Lewis
- Department of Biological Sciences, University of Bergen, Bergen 5008, Norway
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31
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Muñoz J, Akhavan NS, Mullins AP, Arjmandi BH. Macrophage Polarization and Osteoporosis: A Review. Nutrients 2020; 12:nu12102999. [PMID: 33007863 PMCID: PMC7601854 DOI: 10.3390/nu12102999] [Citation(s) in RCA: 181] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 09/22/2020] [Accepted: 09/28/2020] [Indexed: 12/11/2022] Open
Abstract
Over 200 million people suffer from osteoporosis worldwide. Individuals with osteoporosis have increased rates of bone resorption while simultaneously having impaired osteogenesis. Most current treatments for osteoporosis focus on anti-resorptive methods to prevent further bone loss. However, it is important to identify safe and cost-efficient treatments that not only inhibit bone resorption, but also stimulate anabolic mechanisms to upregulate osteogenesis. Recent data suggest that macrophage polarization may contribute to osteoblast differentiation and increased osteogenesis as well as bone mineralization. Macrophages exist in two major polarization states, classically activated macrophages (M1) and alternatively activated macrophage (M2) macrophages. The polarization state of macrophages is dependent on molecules in the microenvironment including several cytokines and chemokines. Mechanistically, M2 macrophages secrete osteogenic factors that stimulate the differentiation and activation of pre-osteoblastic cells, such as mesenchymal stem cells (MSC’s), and subsequently increase bone mineralization. In this review, we cover the mechanisms by which M2 macrophages contribute to osteogenesis and postulate the hypothesis that regulating macrophage polarization states may be a potential treatment for the treatment of osteoporosis.
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32
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Alarabi AB, Karim ZA, Hinojos V, Lozano PA, Hernandez KR, Montes Ramirez JE, Ali HEA, Khasawneh FT, Alshbool FZ. The G-protein βγ subunits regulate platelet function. Life Sci 2020; 262:118481. [PMID: 32971104 DOI: 10.1016/j.lfs.2020.118481] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/07/2020] [Accepted: 09/14/2020] [Indexed: 10/23/2022]
Abstract
AIMS G-protein coupled receptors (GPCRs) tightly regulate platelet function by interacting with various physiological agonists. An essential mediator of GPCR signaling is the G protein αβγ heterotrimers, in which the βγ subunits are central players in downstream signaling. Herein, we investigated the role of Gβγ subunits in platelet function, hemostasis and thrombogenesis. METHODS To achieve this goal, platelets from both mice and humans were employed in the context of a small molecule inhibitor of Gβγ, namely gallein. We used an aggregometer to examine aggregation and dense granules secretion. We also used flow cytometry for P-selectin and PAC1 to determine the impact of inhibiting Gβγ on α -granule secretion and αIIbβ3 activation. Clot retraction and the platelet spreading assay were used to examine Gβγ role in outside-in platelet signaling, whereas Western blot was employed to examine its role in Akt activation. Finally, we used the bleeding time assay and the FeCl3-induced carotid-artery injury thrombosis model to determine Gβγ contribution to in vivo platelet function. RESULTS We observed that gallein inhibits platelet aggregation and secretion in response to agonist stimulation, in both mouse and human platelets. Furthermore, gallein also exerted inhibitory effects on integrin αIIbβ3 activation, clot retraction, platelet spreading and Akt activation/phosphorylation. Finally, gallein's inhibitory effects manifested in vivo, as documented by its ability to modulate physiological hemostasis and delay thrombus formation. CONCLUSION Our findings demonstrate, for the first time, that Gβγ subunits directly regulate GPCR-dependent platelet function, in vitro and in vivo. Moreover, these data highlight Gβγ as a novel therapeutic target for managing thrombotic disorders.
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Affiliation(s)
- Ahmed B Alarabi
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University, Kingsville, TX 78363, USA
| | - Zubair A Karim
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Victoria Hinojos
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Patricia A Lozano
- Department of Pharmacy Practice, Irma Lerma Rangel College of Pharmacy, Texas A&M University, Kingsville, TX 78363, USA
| | - Keziah R Hernandez
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Jean E Montes Ramirez
- Department of Pharmaceutical Sciences, School of Pharmacy, The University of Texas El Paso, El Paso, TX 79902, USA
| | - Hamdy E A Ali
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University, Kingsville, TX 78363, USA
| | - Fadi T Khasawneh
- Department of Pharmaceutical Sciences, Irma Lerma Rangel College of Pharmacy, Texas A&M University, Kingsville, TX 78363, USA
| | - Fatima Z Alshbool
- Department of Pharmacy Practice, Irma Lerma Rangel College of Pharmacy, Texas A&M University, Kingsville, TX 78363, USA.
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33
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Shorning BY, Dass MS, Smalley MJ, Pearson HB. The PI3K-AKT-mTOR Pathway and Prostate Cancer: At the Crossroads of AR, MAPK, and WNT Signaling. Int J Mol Sci 2020; 21:E4507. [PMID: 32630372 PMCID: PMC7350257 DOI: 10.3390/ijms21124507] [Citation(s) in RCA: 314] [Impact Index Per Article: 78.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/22/2020] [Accepted: 06/22/2020] [Indexed: 12/13/2022] Open
Abstract
Oncogenic activation of the phosphatidylinositol-3-kinase (PI3K), protein kinase B (PKB/AKT), and mammalian target of rapamycin (mTOR) pathway is a frequent event in prostate cancer that facilitates tumor formation, disease progression and therapeutic resistance. Recent discoveries indicate that the complex crosstalk between the PI3K-AKT-mTOR pathway and multiple interacting cell signaling cascades can further promote prostate cancer progression and influence the sensitivity of prostate cancer cells to PI3K-AKT-mTOR-targeted therapies being explored in the clinic, as well as standard treatment approaches such as androgen-deprivation therapy (ADT). However, the full extent of the PI3K-AKT-mTOR signaling network during prostate tumorigenesis, invasive progression and disease recurrence remains to be determined. In this review, we outline the emerging diversity of the genetic alterations that lead to activated PI3K-AKT-mTOR signaling in prostate cancer, and discuss new mechanistic insights into the interplay between the PI3K-AKT-mTOR pathway and several key interacting oncogenic signaling cascades that can cooperate to facilitate prostate cancer growth and drug-resistance, specifically the androgen receptor (AR), mitogen-activated protein kinase (MAPK), and WNT signaling cascades. Ultimately, deepening our understanding of the broader PI3K-AKT-mTOR signaling network is crucial to aid patient stratification for PI3K-AKT-mTOR pathway-directed therapies, and to discover new therapeutic approaches for prostate cancer that improve patient outcome.
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Affiliation(s)
| | | | | | - Helen B. Pearson
- The European Cancer Stem Cell Research Institute, Cardiff University, Hadyn Ellis Building, Maindy Road, Cardiff CF24 4HQ, Wales, UK; (B.Y.S.); (M.S.D.); (M.J.S.)
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Rao L, Mak VCY, Zhou Y, Zhang D, Li X, Fung CCY, Sharma R, Gu C, Lu Y, Tipoe GL, Cheung ANY, Mills GB, Cheung LWT. p85β regulates autophagic degradation of AXL to activate oncogenic signaling. Nat Commun 2020; 11:2291. [PMID: 32385243 PMCID: PMC7210311 DOI: 10.1038/s41467-020-16061-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 04/09/2020] [Indexed: 12/12/2022] Open
Abstract
PIK3R2 encodes the p85β regulatory subunit of phosphatidylinositol 3-kinase and is frequently amplified in cancers. The signaling mechanism and therapeutic implication of p85β are poorly understood. Here we report that p85β upregulates the protein level of the receptor tyrosine kinase AXL to induce oncogenic signaling in ovarian cancer. p85β activates p110 activity and AKT-independent PDK1/SGK3 signaling to promote tumorigenic phenotypes, which are all abolished upon inhibition of AXL. At the molecular level, p85β alters the phosphorylation of TRIM2 (an E3 ligase) and optineurin (an autophagy receptor), which mediate the selective regulation of AXL by p85β, thereby disrupting the autophagic degradation of the AXL protein. Therapeutically, p85β expression renders ovarian cancer cells vulnerable to inhibitors of AXL, p110, or PDK1. Conversely, p85β-depleted cells are less sensitive to these inhibitors. Together, our findings provide a rationale for pharmacological blockade of the AXL signaling axis in PIK3R2-amplified ovarian cancer.
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Affiliation(s)
- Ling Rao
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Victor C Y Mak
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Yuan Zhou
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Dong Zhang
- Knight Cancer Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Xinran Li
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Chloe C Y Fung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Rakesh Sharma
- Proteomics and Metabolomics Core Facility, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Chao Gu
- Department of Obstetrics and Gynecology, Obstetrics and Gynecology Hospital, Fudan University, Shanghai, China
| | - Yiling Lu
- Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - George L Tipoe
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Annie N Y Cheung
- Department of Pathology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong
| | - Gordon B Mills
- Knight Cancer Institute, Oregon Health and Science University, Portland, Oregon, USA
| | - Lydia W T Cheung
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong.
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Marqués M, Tranchant R, Risa-Ebrí B, Suárez-Solís ML, Fernández LC, Carrillo-de-Santa-Pau E, Del Pozo N, Martínez de Villarreal J, Meiller C, Allory Y, Blum Y, Pirker C, Hegedus B, Barry ST, Carnero A, Berger W, Jean D, Real FX. Combined MEK and PI3K/p110β Inhibition as a Novel Targeted Therapy for Malignant Mesothelioma Displaying Sarcomatoid Features. Cancer Res 2020; 80:843-856. [PMID: 31911549 DOI: 10.1158/0008-5472.can-19-1633] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 11/01/2019] [Accepted: 12/18/2019] [Indexed: 11/16/2022]
Abstract
Among malignant mesotheliomas (MM), the sarcomatoid subtype is associated with higher chemoresistance and worst survival. Due to its low incidence, there has been little progress in the knowledge of the molecular mechanisms associated with sarcomatoid MM, which might help to define novel therapeutic targets. In this work, we show that loss of PTEN expression is frequent in human sarcomatoid MM and PTEN expression levels are lower in sarcomatoid MM than in the biphasic and epithelioid subtypes. Combined Pten and Trp53 deletion in mouse mesothelium led to nonepithelioid MM development. In Pten;Trp53-null mice developing MM, the Gαi2-coupled receptor subunit activated MEK/ERK and PI3K, resulting in aggressive, immune-suppressed tumors. Combined inhibition of MEK and p110β/PI3K reduced mouse tumor cell growth in vitro. Therapeutic inhibition of MEK and p110β/PI3K using selumetinib (AZD6244, ARRY-142886) and AZD8186, two drugs that are currently in clinical trials, increased the survival of Pten;Trp53-null mice without major toxicity. This drug combination effectively reduced the proliferation of primary cultures of human pleural (Pl) MM, implicating nonepithelioid histology and high vimentin, AKT1/2, and Gαi2 expression levels as predictive markers of response to combined MEK and p110β/PI3K inhibition. Our findings provide a rationale for the use of selumetinib and AZD8186 in patients with MM with sarcomatoid features. This constitutes a novel targeted therapy for a poor prognosis and frequently chemoresistant group of patients with MM, for whom therapeutic options are currently lacking. SIGNIFICANCE: Mesothelioma is highly aggressive; its sarcomatoid variants have worse prognosis. Building on a genetic mouse model, a novel combination therapy is uncovered that is relevant to human tumors.
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Affiliation(s)
- Miriam Marqués
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain. .,CIBERONC, Madrid, Spain
| | - Robin Tranchant
- Centre de Recherche des Cordeliers, INSERM, Université Paris Descartes, Université Paris Diderot, Sorbonne Université, USPC, Functional Genomics of Solid Tumors Team, Paris, France
| | - Blanca Risa-Ebrí
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain
| | - María L Suárez-Solís
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,Department of Surgical Pathology, Hospital Clínico San Carlos, Madrid, Spain
| | - Luis C Fernández
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,Faculty of Biomedical Sciences and Health, Universidad Europea de Madrid, Madrid, Spain
| | - Enrique Carrillo-de-Santa-Pau
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,Computational Biology Group, Precision Nutrition and Cancer Research Program, IMDEA Food Institute, Madrid, Spain
| | - Natalia Del Pozo
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,CIBERONC, Madrid, Spain
| | | | - Clément Meiller
- Centre de Recherche des Cordeliers, INSERM, Université Paris Descartes, Université Paris Diderot, Sorbonne Université, USPC, Functional Genomics of Solid Tumors Team, Paris, France
| | - Yves Allory
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,Université Paris-Est Créteil, France INSERM, U955, Institut Mondor de Recherche Biomédicales AP-HP, Hôpital Henri Mondor, Department of Pathology, Créteil, France
| | - Yuna Blum
- Programme Cartes d'Identité des Tumeurs (CIT), Ligue Nationale Contre Le Cancer, Paris, France
| | - Christine Pirker
- Institute of Cancer Research and Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria
| | - Balazs Hegedus
- Department of Thoracic Surgery, Medical of University Vienna, Vienna, Austria
| | - Simon T Barry
- IMED Oncology, AstraZeneca, Li Ka Shing Centre, Cambridge, United Kingdom
| | - Amancio Carnero
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain.,CIBERONC, Madrid, Spain.,Instituto de Biomedicina de Sevilla, IBIS/HUVR/Universidad de Sevilla/Consejo Superior de Investigaciones Científicas, Sevilla, Spain
| | - Walter Berger
- Institute of Cancer Research and Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria
| | - Didier Jean
- Centre de Recherche des Cordeliers, INSERM, Université Paris Descartes, Université Paris Diderot, Sorbonne Université, USPC, Functional Genomics of Solid Tumors Team, Paris, France
| | - Francisco X Real
- Epithelial Carcinogenesis Group, Spanish National Cancer Centre-CNIO, Madrid, Spain. .,CIBERONC, Madrid, Spain.,Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Barcelona, Spain
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Galvão Tessaro FH, Ayala TS, Bella LM, Martins JO. Macrophages from a type 1 diabetes mouse model present dysregulated Pl3K/AKT, ERK 1/2 and SAPK/JNK levels. Immunobiology 2019; 225:151879. [PMID: 31812346 DOI: 10.1016/j.imbio.2019.11.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 11/26/2019] [Indexed: 01/03/2023]
Abstract
Diabetes causes dysregulation in signal transduction in immune cells leading to an impaired response to pathogens. Herein, we investigated the impact of type 1 diabetes (T1D) in bone marrow-derived macrophages (BMDM), using male non-diabetic and diabetic C57BL/6 mice (alloxan 60 mg/kg, i.v., CEUA/FCF/USP - 467). Diabetic BMDM expressed impaired phosphoinositide 3-kinase (PI3K), being lower p-PI3K p55 levels and higher levels of PI3K p110 alpha, whereas protein kinase B (PKB/Akt) (Ser-473 and Thr-308), extracellular signal-regulated kinases (ERK 1/2), and stress-activated protein kinase (SAPK/JNK) were enhanced compared to non-diabetic BMDM. Further evaluation of the responsiveness to lipopolysaccharide (LPS; 0.1 and 1 ug/mL), diabetic BMDM and peritoneal macrophage secreted dysregulated levels of tumor necrosis factor (TNF)-α, interleukin (IL)-6, and IL-10 levels. In 24 h, diabetic BMDM stimulated by LPS presented lower metabolic activity, with no differences in cell surveillance. Therefore, LPS re-stimulation (0.1 ug/mL) in diabetic BMDM resulted in higher secretion of TNF-α compared to non-diabetic BMDM. However, diabetic peritoneal macrophages secreted similar IL-6 levels in the first and additional 24 h of LPS stimulation. In general, our results demonstrated that diabetes exerts an impact in both BMDM and peritoneal macrophages ability to secrete cytokine under LPS stimulation.
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Affiliation(s)
- Fernando Henrique Galvão Tessaro
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences - University of Sao Paulo (FCF/USP), São Paulo, Brazil
| | - Thais Soprani Ayala
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences - University of Sao Paulo (FCF/USP), São Paulo, Brazil
| | - Leonardo Mendes Bella
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences - University of Sao Paulo (FCF/USP), São Paulo, Brazil
| | - Joilson Oliveira Martins
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analysis, School of Pharmaceutical Sciences - University of Sao Paulo (FCF/USP), São Paulo, Brazil.
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Tian G, Chen J, Luo Y, Yang J, Gao T, Shi J. Ethanol extract of Ligustrum lucidum Ait. leaves suppressed hepatocellular carcinoma in vitro and in vivo. Cancer Cell Int 2019; 19:246. [PMID: 31572063 PMCID: PMC6761729 DOI: 10.1186/s12935-019-0960-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 09/13/2019] [Indexed: 12/15/2022] Open
Abstract
Background The present study investigated the pharmacological activity and mechanism of ethanol extract of Ligustrum lucidum Ait. leaves (EEL) on HCC. Methods Cell viability was determined using cell counting kit-8 (CCK-8) assay. The effects of EEL on cellular biological activities were analyzed by flow cytometry (FCM), cell wound scratch assay and transwell assay. The expression levels of related mRNA and protein were determined by performing quantitative real-time PCR (qRT-PCR), Western blotting assay and immunocytochemistry. Methylation-specific PCR (MSP) was carried out to investigate the possible mechanism underlying the DNA methylation of PTEN. Results EEL showed cytotoxicity to both Bel-7402 and Huh-7 cell lines. We also found that EEL enhanced the apoptosis of Bel-7402 and Huh-7 cells by regulating the expressions of Bcl-2 associated X (Bax), B cell lymphoma 2 (Bcl-2) and Cytochrome-C and the activity of caspase-3 and therefore promoted cell cycle arrest. Moreover, EEL also suppressed cell migration and invasion. EEL increased the expression of tissue inhibitor of metalloproteinases 2 (TIMP2) but decreased the expressions of matrix metalloproteinase2 (MMP2) and MMP9. Furthermore, EEL inhibited the phosphorylation of PI3K/Akt pathway. MSP results showed that EEL promoted the demethylation of PTEN, suggesting that the inactivation of PI3K/Akt may be related to DNA de-methylation of PTEN. In addition, EEL inhibited the tumor growth of HCC in vivo. Conclusions EEL exerted anti-tumor effect on HCC in vitro and in vivo. EEL mediated by the inhibition of PI3K/Akt may be closely related to DNA de-methylation of PTEN. Thus, EEL could be used as a potential anti-cancer therapeutic agent of HCC.
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Affiliation(s)
- Guoyan Tian
- 1Department of Oncology and Hematology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang Province China
| | - Jin Chen
- 2The Fourth Clinical Medical College, Zhejiang Chinese Medicine University, Hangzhou, Zhejiang Province China
| | - Yan Luo
- 3Institute of Translational Medicine, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang Province China
| | - Jin Yang
- 3Institute of Translational Medicine, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang Province China
| | - Tao Gao
- 4TCM Gynecology, Hangzhou Hospital of Traditional Chinese Medicine, Hangzhou, Zhejiang Province China
| | - Junping Shi
- 5Department of Liver Diseases, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang Province China
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Human PI3Kγ deficiency and its microbiota-dependent mouse model reveal immunodeficiency and tissue immunopathology. Nat Commun 2019; 10:4364. [PMID: 31554793 PMCID: PMC6761123 DOI: 10.1038/s41467-019-12311-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 08/30/2019] [Indexed: 02/08/2023] Open
Abstract
Phosphatidylinositol 3-kinase-gamma (PI3Kγ) is highly expressed in leukocytes and is an attractive drug target for immune modulation. Different experimental systems have led to conflicting conclusions regarding inflammatory and anti-inflammatory functions of PI3Kγ. Here, we report a human patient with bi-allelic, loss-of-function mutations in PIK3CG resulting in absence of the p110γ catalytic subunit of PI3Kγ. She has a history of childhood-onset antibody defects, cytopenias, and T lymphocytic pneumonitis and colitis, with reduced peripheral blood memory B, memory CD8+ T, and regulatory T cells and increased CXCR3+ tissue-homing CD4 T cells. PI3Kγ-deficient macrophages and monocytes produce elevated inflammatory IL-12 and IL-23 in a GSK3α/β-dependent manner upon TLR stimulation. Pik3cg-deficient mice recapitulate major features of human disease after exposure to natural microbiota through co-housing with pet-store mice. Together, our results emphasize the physiological importance of PI3Kγ in restraining inflammation and promoting appropriate adaptive immune responses in both humans and mice.
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Buchanan CM, Lee KL, Shepherd PR. For Better or Worse: The Potential for Dose Limiting the On-Target Toxicity of PI 3-Kinase Inhibitors. Biomolecules 2019; 9:biom9090402. [PMID: 31443495 PMCID: PMC6770514 DOI: 10.3390/biom9090402] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 08/15/2019] [Accepted: 08/21/2019] [Indexed: 02/07/2023] Open
Abstract
The hyper-activation of the phosphoinositide (PI) 3-kinase signaling pathway is a hallmark of many cancers and overgrowth syndromes, and as a result, there has been intense interest in the development of drugs that target the various isoforms of PI 3-kinase. Given the key role PI 3-kinases play in many normal cell functions, there is significant potential for the disruption of essential cellular functions by PI 3-kinase inhibitors in normal tissues; so-called on-target drug toxicity. It is, therefore, no surprise that progress within the clinical development of PI 3-kinase inhibitors as single-agent anti-cancer therapies has been slowed by the difficulty of identifying a therapeutic window. The aim of this review is to place the cellular, tissue and whole-body effects of PI 3-kinase inhibition in the context of understanding the potential for dose limiting on-target toxicities and to introduce possible strategies to overcome these.
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Affiliation(s)
- Christina M Buchanan
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Kate L Lee
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
| | - Peter R Shepherd
- Department of Molecular Medicine and Pathology, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Salloum G, Jakubik CT, Erami Z, Heitz SD, Bresnick AR, Backer JM. PI3Kβ is selectively required for growth factor-stimulated macropinocytosis. J Cell Sci 2019; 132:jcs.231639. [PMID: 31409694 DOI: 10.1242/jcs.231639] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 07/16/2019] [Indexed: 12/16/2022] Open
Abstract
Macropinocytosis is an actin-dependent but clathrin-independent endocytic process by which cells nonselectively take up large aliquots of extracellular material. Macropinocytosis is used for immune surveillance by dendritic cells, as a route of infection by viruses and protozoa, and as a nutrient uptake pathway in tumor cells. In this study, we explore the role of class I phosphoinositide 3-kinases (PI3Ks) during ligand-stimulated macropinocytosis. We find that macropinocytosis in response to receptor tyrosine kinase activation is strikingly dependent on a single class I PI3K isoform, namely PI3Kβ (containing the p110β catalytic subunit encoded by PIK3CB). Loss of PI3Kβ expression or activity blocks macropinocytosis at early steps, before the formation of circular dorsal ruffles, but also plays a role in later steps, downstream from Rac1 activation. PI3Kβ is also required for the elevated levels of constitutive macropinocytosis found in tumor cells that are defective for the PTEN tumor suppressor. Our data shed new light on PI3K signaling during macropinocytosis, and suggest new therapeutic uses for pharmacological inhibitors of PI3Kβ.
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Affiliation(s)
- Gilbert Salloum
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Charles T Jakubik
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Zahra Erami
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Samantha D Heitz
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Anne R Bresnick
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Jonathan M Backer
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA .,Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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p110γ deficiency protects against pancreatic carcinogenesis yet predisposes to diet-induced hepatotoxicity. Proc Natl Acad Sci U S A 2019; 116:14724-14733. [PMID: 31266893 DOI: 10.1073/pnas.1813012116] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is notorious for its poor survival and resistance to conventional therapies. PI3K signaling is implicated in both disease initiation and progression, and specific inhibitors of selected PI3K p110 isoforms for managing solid tumors are emerging. We demonstrate that increased activation of PI3K signals cooperates with oncogenic Kras to promote aggressive PDAC in vivo. The p110γ isoform is overexpressed in tumor tissue and promotes carcinogenesis via canonical AKT signaling. Its selective blockade sensitizes tumor cells to gemcitabine in vitro, and genetic ablation of p110γ protects against Kras-induced tumorigenesis. Diet/obesity was identified as a crucial means of p110 subunit up-regulation, and in the setting of a high-fat diet, p110γ ablation failed to protect against tumor development, showing increased activation of pAKT and hepatic damage. These observations suggest that a careful and judicious approach should be considered when targeting p110γ for therapy, particularly in obese patients.
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Chen X, Zhabyeyev P, Azad AK, Wang W, Minerath RA, DesAulniers J, Grueter CE, Murray AG, Kassiri Z, Vanhaesebroeck B, Oudit GY. Endothelial and cardiomyocyte PI3Kβ divergently regulate cardiac remodelling in response to ischaemic injury. Cardiovasc Res 2019; 115:1343-1356. [PMID: 30496354 PMCID: PMC6587920 DOI: 10.1093/cvr/cvy298] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 11/08/2018] [Accepted: 11/27/2018] [Indexed: 12/13/2022] Open
Abstract
AIMS Cardiac remodelling in the ischaemic heart determines prognosis in patients with ischaemic heart disease (IHD), while enhancement of angiogenesis and cell survival has shown great potential for IHD despite translational challenges. Phosphoinositide 3-kinase (PI3K)/Akt signalling pathways play a critical role in promoting angiogenesis and cell survival. However, the effect of PI3Kβ in the ischaemic heart is poorly understood. This study investigates the role of endothelial and cardiomyocyte (CM) PI3Kβ in post-infarct cardiac remodelling. METHODS AND RESULTS PI3Kβ catalytic subunit-p110β level was increased in infarcted murine and human hearts. Using cell type-specific loss-of-function approaches, we reported novel and distinct actions of p110β in endothelial cells (ECs) vs. CMs in response to myocardial ischaemic injury. Inactivation of endothelial p110β resulted in marked resistance to infarction and adverse cardiac remodelling with decreased mortality, improved systolic function, preserved microvasculature, and enhanced Akt activation. Cultured ECs with p110β knockout or inhibition displayed preferential PI3Kα/Akt/endothelial nitric oxide synthase signalling that consequently promoted protective signalling and angiogenesis. In contrast, mice with CM p110β-deficiency exhibited adverse post-infarct ventricular remodelling with larger infarct size and deteriorated cardiac function, which was due to enhanced susceptibility of CMs to ischaemia-mediated cell death. Disruption of CM p110β signalling compromised nuclear p110β and phospho-Akt levels leading to perturbed gene expression and elevated pro-cell death protein levels, increasing the susceptibility to CM death. A similar divergent response of PI3Kβ endothelial and CM mutant mice was seen using a model of myocardial ischaemia-reperfusion injury. CONCLUSION These data demonstrate novel, differential, and cell-specific functions of PI3Kβ in the ischaemic heart. While the loss of endothelial PI3Kβ activity produces cardioprotective effects, CM PI3Kβ is protective against myocardial ischaemic injury.
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Affiliation(s)
- Xueyi Chen
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Pavel Zhabyeyev
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Abul K Azad
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Wang Wang
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
| | - Rachel A Minerath
- Division of Cardiovascular Medicine, Department of Internal Medicine, Francois M. Abboud Cardiovascular Research Center, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA, USA
| | - Jessica DesAulniers
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Chad E Grueter
- Division of Cardiovascular Medicine, Department of Internal Medicine, Francois M. Abboud Cardiovascular Research Center, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa City, IA, USA
| | - Allan G Murray
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Zamaneh Kassiri
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
- Department of Physiology, University of Alberta, Edmonton, Alberta, Canada
| | - Bart Vanhaesebroeck
- University College London Cancer Institute, University College London, London, UK
| | - Gavin Y Oudit
- Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
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Potential Roles of miR-374a-5p in Mediating Neuroprotective Effects and Related Molecular Mechanism. J Mol Neurosci 2019; 69:123-132. [DOI: 10.1007/s12031-019-01340-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 05/16/2019] [Indexed: 12/14/2022]
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44
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Castillo SD, Baselga E, Graupera M. PIK3CA mutations in vascular malformations. Curr Opin Hematol 2019; 26:170-178. [DOI: 10.1097/moh.0000000000000496] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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45
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De Santis MC, Gulluni F, Campa CC, Martini M, Hirsch E. Targeting PI3K signaling in cancer: Challenges and advances. Biochim Biophys Acta Rev Cancer 2019; 1871:361-366. [DOI: 10.1016/j.bbcan.2019.03.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/14/2019] [Accepted: 03/15/2019] [Indexed: 12/19/2022]
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46
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Bresnick AR, Backer JM. PI3Kβ-A Versatile Transducer for GPCR, RTK, and Small GTPase Signaling. Endocrinology 2019; 160:536-555. [PMID: 30601996 PMCID: PMC6375709 DOI: 10.1210/en.2018-00843] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/20/2018] [Indexed: 12/17/2022]
Abstract
The phosphoinositide 3-kinase (PI3K) family includes eight distinct catalytic subunits and seven regulatory subunits. Only two PI3Ks are directly regulated downstream from G protein-coupled receptors (GPCRs): the class I enzymes PI3Kβ and PI3Kγ. Both enzymes produce phosphatidylinositol 3,4,5-trisposphate in vivo and are regulated by both heterotrimeric G proteins and small GTPases from the Ras or Rho families. However, PI3Kβ is also regulated by direct interactions with receptor tyrosine kinases (RTKs) and their tyrosine phosphorylated substrates, and similar to the class II and III PI3Ks, it binds activated Rab5. The unusually complex regulation of PI3Kβ by small and trimeric G proteins and RTKs leads to a rich landscape of signaling responses at the cellular and organismic levels. This review focuses first on the regulation of PI3Kβ activity in vitro and in cells, and then summarizes the biology of PI3Kβ signaling in distinct tissues and in human disease.
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Affiliation(s)
- Anne R Bresnick
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York
| | - Jonathan M Backer
- Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York
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47
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Li YY, Zheng G, Liu L. Bioinformatics Based Therapeutic Effects of Sinomenium Acutum. Chin J Integr Med 2019; 25:122-130. [PMID: 29564801 DOI: 10.1007/s11655-018-2796-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/09/2016] [Indexed: 01/07/2023]
Abstract
OBJECTIVE To decipher the possible mechanisms of Sinomenium Acutum (SA) in treating diseases by a bioinformatics method. METHODS SA ingredients were searched according to Chinese Pharmacopoeia, Chinese Medicine Dictionary and Traditional Chinese Medicines Database (TCMD). Active compounds and target proteins of SA were acquired through the Pubchem platform. Pathway, network and function analyses of SA were performed with ingenuity pathway analysis (IPA), a bioinformatics analysis platform. Disease, biofunction-target networks were established with Cytoscape. RESULTS Eighteen ingredients from SA were obtained. Seven active ingredients with 31 active target proteins were acquired according to PubChem Bioassay test. By IPA analysis, 277 canonical pathways belonging to 17 function categories were collected, 23 kinds of diseases, 21 categories bio-functions were obtained. Based on P value, calculated by IPA, the top 5 significant pathway of SA targets include phosphatidylinositol 3 kinase/Akt (PI3K/Akt) signaling, prostate cancer signaling, macrophage migration inhibitory factor (MIF) regulation of innate immunity, Guanosine-binding protein coupled receptor (GPCR) signaling, and ataxia telangiectasia mutated protein (ATM) signaling. Disease and bio-function network analysis indicated that mitogen activated protein kinase 1 (MAPK1), MAPK3, p65 nuclear factor κB (RELA), nuclear factor of κB inhibitor alpha (NFκBIA), interleukin 1β(IL-1β), prostaglandin G/H synthase 2 (PTGS2) and tumor protein 53 (TP53) were the critical targets in various diseases treated by SA. CONCLUSION In the different view of target, pathway, disease and bio-function, inflammation was found to be a central theme in many chronic conditions. SA could be used not only as an anti-inflammatory agent, but also for the treatment of cancers, neurological diseases, psychological disorders and metabolic diseases.
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Affiliation(s)
- Yu-Yan Li
- Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, 999078, China.,Department of Nephrology, Shenzhen Traditional Chinese Medicine Hospital, Shenzhen, 518033, China
| | - Guang Zheng
- School of Information Science and Engineering, Lanzhou University, Lanzhou, 730000, China
| | - Liang Liu
- Faculty of Chinese Medicine, Macau University of Science and Technology, Macau, 999078, China.
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48
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Gurska LM, Ames K, Gritsman K. Signaling Pathways in Leukemic Stem Cells. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1143:1-39. [PMID: 31338813 PMCID: PMC7249489 DOI: 10.1007/978-981-13-7342-8_1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Hematopoietic stem cells (HSCs) and leukemic stem cells (LSCs) utilize many of the same signaling pathways for their maintenance and survival. In this review, we will focus on several signaling pathways whose roles have been extensively studied in both HSCs and LSCs. Our main focus will be on the PI3K/AKT/mTOR pathway and several of its regulators and downstream effectors. We will also discuss several other signaling pathways of particular importance in LSCs, including the WNT/β-catenin pathway, the NOTCH pathway, and the TGFβ pathway. For each of these pathways, we will emphasize differences in how these pathways operate in LSCs, compared to their function in HSCs, to highlight opportunities for the specific therapeutic targeting of LSCs. We will also highlight areas of crosstalk between multiple signaling pathways that may affect LSC function.
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Affiliation(s)
- Lindsay M Gurska
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Kristina Ames
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Kira Gritsman
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA.
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, USA.
- Department of Medical Oncology, Montefiore Hospital, Bronx, New York, USA.
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49
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Pilling D, Chinea LE, Consalvo KM, Gomer RH. Different Isoforms of the Neuronal Guidance Molecule Slit2 Directly Cause Chemoattraction or Chemorepulsion of Human Neutrophils. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2019; 202:239-248. [PMID: 30510066 PMCID: PMC6310129 DOI: 10.4049/jimmunol.1800681] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 11/02/2018] [Indexed: 12/11/2022]
Abstract
The movement of neutrophils between blood and tissues appears to be regulated by chemoattractants and chemorepellents. Compared with neutrophil chemoattractants, relatively little is known about neutrophil chemorepellents. Slit proteins are endogenously cleaved into a variety of N- and C-terminal fragments, and these fragments are neuronal chemorepellents and inhibit chemoattraction of many cell types, including neutrophils. In this report, we show that the ∼140-kDa N-terminal Slit2 fragment (Slit2-N) is a chemoattractant and the ∼110-kDa N-terminal Slit2 fragment (Slit2-S) is a chemorepellent for human neutrophils. The effects of both Slit2 fragments were blocked by Abs to the Slit2 receptor Roundabout homolog 1 or the Slit2 coreceptor Syndecan-4. Slit2-N did not appear to activate Ras but increased phosphatidylinositol 3,4,5-triphosphate levels. Slit2-N-induced chemoattraction was unaffected by Ras inhibitors, reversed by PI3K inhibitors, and blocked by Cdc42 and Rac inhibitors. In contrast, Slit2-S activated Ras but did not increase phosphatidylinositol 3,4,5-triphosphate levels. Slit2-S-induced chemorepulsion was blocked by Ras and Rac inhibitors, not affected by PI3K inhibitors, and reversed by Cdc42 inhibitors. Slit2-N, but not Slit2-S, increased neutrophil adhesion, myosin L chain 2 phosphorylation, and polarized actin formation and single pseudopods at the leading edge of cells. Slit2-S induced multiple pseudopods. These data suggest that Slit2 isoforms use similar receptors but different intracellular signaling pathways and have different effects on the cytoskeleton and pseudopods to induce neutrophil chemoattraction or chemorepulsion.
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Affiliation(s)
- Darrell Pilling
- Department of Biology, Texas A&M University, College Station, TX 77843-3474
| | - Luis E Chinea
- Department of Biology, Texas A&M University, College Station, TX 77843-3474
| | - Kristen M Consalvo
- Department of Biology, Texas A&M University, College Station, TX 77843-3474
| | - Richard H Gomer
- Department of Biology, Texas A&M University, College Station, TX 77843-3474
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50
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Patel VB, Zhabyeyev P, Chen X, Wang F, Paul M, Fan D, McLean BA, Basu R, Zhang P, Shah S, Dawson JF, Pyle WG, Hazra M, Kassiri Z, Hazra S, Vanhaesebroeck B, McCulloch CA, Oudit GY. PI3Kα-regulated gelsolin activity is a critical determinant of cardiac cytoskeletal remodeling and heart disease. Nat Commun 2018; 9:5390. [PMID: 30568254 PMCID: PMC6300608 DOI: 10.1038/s41467-018-07812-8] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Accepted: 11/28/2018] [Indexed: 12/21/2022] Open
Abstract
Biomechanical stress and cytoskeletal remodeling are key determinants of cellular homeostasis and tissue responses to mechanical stimuli and injury. Here we document the increased activity of gelsolin, an actin filament severing and capping protein, in failing human hearts. Deletion of gelsolin prevents biomechanical stress-induced adverse cytoskeletal remodeling and heart failure in mice. We show that phosphatidylinositol (3,4,5)-triphosphate (PIP3) lipid suppresses gelsolin actin-severing and capping activities. Accordingly, loss of PI3Kα, the key PIP3-producing enzyme in the heart, increases gelsolin-mediated actin-severing activities in the myocardium in vivo, resulting in dilated cardiomyopathy in response to pressure-overload. Mechanical stretching of adult PI3Kα-deficient cardiomyocytes disrupts the actin cytoskeleton, which is prevented by reconstituting cells with PIP3. The actin severing and capping activities of recombinant gelsolin are effectively suppressed by PIP3. Our data identify the role of gelsolin-driven cytoskeletal remodeling in heart failure in which PI3Kα/PIP3 act as negative regulators of gelsolin activity.
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Affiliation(s)
- Vaibhav B Patel
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology and Pharmacology and Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, HMRB-71, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
| | - Pavel Zhabyeyev
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
| | - Xueyi Chen
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
| | - Faqi Wang
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
| | - Manish Paul
- Department of Biotechnology, North Orissa University, Baripada, 757003, Odisha, India
| | - Dong Fan
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada
| | - Brent A McLean
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada
| | - Ratnadeep Basu
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada
| | - Pu Zhang
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada
| | - Saumya Shah
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
| | - John F Dawson
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, N1G 2W1, Canada
- Centre of Cardiovascular Investigations, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - W Glen Pyle
- Centre of Cardiovascular Investigations, University of Guelph, Guelph, ON, N1G 2W1, Canada
- Department of Biomedical Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Mousumi Hazra
- Department of Botany and Microbiology, Gurukula Kangri University, Haridwar, 249404, Uttarakhand, India
| | - Zamaneh Kassiri
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada
| | - Saugata Hazra
- Department of Biotechnology, Indian Institute of Technology, Roorkee, 247667, Uttarakhand, India
- Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee, 247667, Uttarakhand, India
| | - Bart Vanhaesebroeck
- UCL Cancer Institute, University College London, London, WC1E 6BT, England, UK
| | - Christopher A McCulloch
- Matrix Dynamics Group, Faculty of Dentistry, University of Toronto, Toronto, ON, M5S 3E2, Canada
| | - Gavin Y Oudit
- Division of Cardiology, Department of Medicine, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada.
- Mazankowski Alberta Heart Institute, University of Alberta, 2C2, 8440-112 St, Edmonton, AB T6G 2B7, Canada.
- Department of Physiology, University of Alberta, HMRC-407, 116 St 85 Ave, Edmonton, AB T6G 2S2, Canada.
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