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Buddington KK, Pierzynowski SG, Holmes WE, Buddington RK. Selective and Concentrative Enteropancreatic Recirculation of Antibiotics by Pigs. Antibiotics (Basel) 2023; 13:12. [PMID: 38275322 PMCID: PMC10812520 DOI: 10.3390/antibiotics13010012] [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: 10/31/2023] [Revised: 12/13/2023] [Accepted: 12/16/2023] [Indexed: 01/27/2024] Open
Abstract
Antibiotics that are efficacious for infectious pancreatitis are present in pancreatic exocrine secretion (PES) after intravenous administration and above minimal inhibitory concentrations. We measured concentrations of four antibiotics by tandem liquid chromatography-mass spectroscopy in plasma and PES after enteral administration to juvenile pigs with jugular catheters and re-entrant pancreatic-duodenal catheters. Nystatin, which is not absorbed by the intestine nor used for infectious pancreatitis (negative control), was not detected in plasma or PES. Concentrations of amoxicillin increased in plasma after administration (p = 0.035), but not in PES (p = 0.51). Metronidazole and enrofloxacin that are used for infectious pancreatitis increased in plasma after enteral administration and even more so in PES, with concentrations in PES averaging 3.1 (±0.5)- and 2.3 (±0.6)-fold higher than in plasma, respectively (p's < 0.001). The increase in enrofloxacin in PES relative to plasma was lower after intramuscular administration (1.8 ± 0.5; p = 0.001). The present results demonstrate the presence of a selective and concentrative enteropancreatic pathway of secretion for some antibiotics. Unlike the regulated secretion of bile, the constitutive secretion of PES and intestinal reabsorption may provide a continuous exposure of pancreas tissue and the small intestine to recirculated antibiotics and potentially other therapeutic molecules. There is a need to better understand the enteropancreatic recirculation of antibiotics and the associated mechanisms.
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Affiliation(s)
| | - Stefan G. Pierzynowski
- Department of Biology, Lund University, Sölvegatan 35, 22362 Lund, Sweden;
- Department of Medical Biology, IMW, Jaczewskiego 2, 20-950 Lublin, Poland
| | - William E. Holmes
- Department of Chemical Engineering, University of Louisiana, Lafayette, LA 70503, USA;
| | - Randal K. Buddington
- Department of Health Sciences, University of Memphis, Memphis, TN 38152, USA
- Stonewall Research Facility, LSU Health Sciences, Stonewall, LA 71078, USA
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Bartram T, Schütte P, Möricke A, Houlston RS, Ellinghaus E, Zimmermann M, Bergmann A, Löscher BS, Klein N, Hinze L, Junk SV, Forster M, Bartram CR, Köhler R, Franke A, Schrappe M, Kratz CP, Cario G, Stanulla M. Genetic Variation in ABCC4 and CFTR and Acute Pancreatitis during Treatment of Pediatric Acute Lymphoblastic Leukemia. J Clin Med 2021; 10:jcm10214815. [PMID: 34768335 PMCID: PMC8584334 DOI: 10.3390/jcm10214815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/17/2021] [Accepted: 10/18/2021] [Indexed: 12/12/2022] Open
Abstract
Background: Acute pancreatitis (AP) is a serious, mechanistically not entirely resolved side effect of L-asparaginase-containing treatment for acute lymphoblastic leukemia (ALL). To find new candidate variations for AP, we conducted a genome-wide association study (GWAS). Methods: In all, 1,004,623 single-nucleotide variants (SNVs) were analyzed in 51 pediatric ALL patients with AP (cases) and 1388 patients without AP (controls). Replication used independent patients. Results: The top-ranked SNV (rs4148513) was located within the ABCC4 gene (odds ratio (OR) 84.1; p = 1.04 × 10−14). Independent replication of our 20 top SNVs was not supportive of initial results, partly because rare variants were neither present in cases nor present in controls. However, results of combined analysis (GWAS and replication cohorts) remained significant (e.g., rs4148513; OR = 47.2; p = 7.31 × 10−9). Subsequently, we sequenced the entire ABCC4 gene and its close relative, the cystic fibrosis associated CFTR gene, a strong AP candidate gene, in 48 cases and 47 controls. Six AP-associated variants in ABCC4 and one variant in CFTR were detected. Replication confirmed the six ABCC4 variants but not the CFTR variant. Conclusions: Genetic variation within the ABCC4 gene was associated with AP during the treatment of ALL. No association of AP with CFTR was observed. Larger international studies are necessary to more conclusively assess the risk of rare clinical phenotypes.
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Affiliation(s)
- Thies Bartram
- Department of Pediatrics, University Hospital Schleswig-Holstein, 24105 Kiel, Germany; (T.B.); (A.M.); (M.S.); (G.C.)
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Peter Schütte
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Anja Möricke
- Department of Pediatrics, University Hospital Schleswig-Holstein, 24105 Kiel, Germany; (T.B.); (A.M.); (M.S.); (G.C.)
| | - Richard S. Houlston
- Division of Genetics and Epidemiology, Institute of Cancer Research, Sutton SM2 5NG, UK;
| | - Eva Ellinghaus
- Institute of Clinical Molecular Biology, Kiel University, 24118 Kiel, Germany; (E.E.); (B.-S.L.); (M.F.); (A.F.)
| | - Martin Zimmermann
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Anke Bergmann
- Department of Human Genetics, Hannover Medical School, 30625 Hannover, Germany;
| | - Britt-Sabina Löscher
- Institute of Clinical Molecular Biology, Kiel University, 24118 Kiel, Germany; (E.E.); (B.-S.L.); (M.F.); (A.F.)
| | - Norman Klein
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Laura Hinze
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Stefanie V. Junk
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Michael Forster
- Institute of Clinical Molecular Biology, Kiel University, 24118 Kiel, Germany; (E.E.); (B.-S.L.); (M.F.); (A.F.)
| | - Claus R. Bartram
- Department of Human Genetics, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.R.B.); (R.K.)
| | - Rolf Köhler
- Department of Human Genetics, University Hospital Heidelberg, 69120 Heidelberg, Germany; (C.R.B.); (R.K.)
| | - Andre Franke
- Institute of Clinical Molecular Biology, Kiel University, 24118 Kiel, Germany; (E.E.); (B.-S.L.); (M.F.); (A.F.)
| | - Martin Schrappe
- Department of Pediatrics, University Hospital Schleswig-Holstein, 24105 Kiel, Germany; (T.B.); (A.M.); (M.S.); (G.C.)
| | - Christian P. Kratz
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
| | - Gunnar Cario
- Department of Pediatrics, University Hospital Schleswig-Holstein, 24105 Kiel, Germany; (T.B.); (A.M.); (M.S.); (G.C.)
| | - Martin Stanulla
- Department of Pediatric Hematology and Oncology, Hannover Medical School, 30625 Hannover, Germany; (P.S.); (M.Z.); (N.K.); (L.H.); (S.V.J.); (C.P.K.)
- Correspondence: ; Tel.: +49-511-532-7978
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Pulmonary Arterial Hypertension Due to NPR-C Mutation: A Novel Paradigm for Normal and Pathologic Remodeling? Int J Mol Sci 2019; 20:ijms20123063. [PMID: 31234560 PMCID: PMC6628360 DOI: 10.3390/ijms20123063] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 06/19/2019] [Accepted: 06/21/2019] [Indexed: 12/13/2022] Open
Abstract
Idiopathic Pulmonary Arterial Hypertension (IPAH) is a deadly and disabling disease characterized by severe vascular remodeling of small pulmonary vessels by fibroblasts, myofibroblasts and vascular smooth muscle cell proliferation. Recent studies suggest that the Natriuretic Peptide Clearance Receptor (NPR-C) signaling pathways may play a crucial role in the development of IPAH. Reduced expression or function of NPR-C signaling in pulmonary artery smooth muscle cells may contribute to the pulmonary vascular remodeling, which is characteristic of this disease. The likely mechanisms may involve an impaired interaction between NPR-C, specific growth factors and other signal transduction pathways including but not limited to Gqα/mitogen-activated protein kinase (MAPK)/PI3K and AKT signaling. The resulting failure of growth suppression in pulmonary artery smooth muscle cells provides critical clues to the cellular pathobiology of IPAH. The reciprocal regulation of NPR-C signaling in models of tissue remodeling may thus provide new insights to our understanding of IPAH.
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Najenson AC, Bianchi M, Courreges AP, Rodriguez MR, Casco VH, Vatta MS, Bianciotti LG. The exocrine pancreas is an extracardiac source of atrial natriuretic peptide. Pflugers Arch 2019; 471:915-924. [PMID: 30623208 DOI: 10.1007/s00424-018-02247-y] [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: 08/09/2018] [Revised: 12/14/2018] [Accepted: 12/17/2018] [Indexed: 10/27/2022]
Abstract
Previous studies have shown that atrial natriuretic peptide (ANP) regulates exocrine pancreatic function in health and disease. As extracardiac sources of ANP have been identified and ANP-like immunoreactivity has been reported in the exocrine pancreas, in the present work we sought to establish whether ANP was produced in the rat exocrine pancreas and if conditions like fasting/feeding or acute pancreatitis were reflected on ANP expression. By using RT-PCR, immunoblotting, and immunofluorescence microscopy assays, it was found that both mRNA and protein ANP were present in the acinar cells of the exocrine pancreas. The amount of ANP in the pancreas was lower in than the atrium but similar to other tissues like the kidney and liver. Immunogold labeling electron microscopy studies revealed that ANP was localized in zymogen granules and the endoplasmic reticulum suggesting local synthesis and package into granules. ANP protein expression was significantly increased not only in fasting but also in acute pancreatitis, the latter probably related to impaired secretion. Natriuretic peptide receptor type C which mediates ANP biological effects in the exocrine pancreas was also present in acinar cells and its expression did not change with either fasting or acute pancreatitis. Present findings show that the exocrine pancreas is a relatively important extracardiac source of ANP and further support previous studies strongly suggesting the active role of the peptide in pancreatic physiology and pathophysiology.
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Affiliation(s)
- Ana C Najenson
- Facultad de Farmacia y Bioquímica, Cátedra de Genética, Universidad de Buenos Aires, Buenos Aires, Argentina.,CONICET-Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Mariana Bianchi
- Facultad de Ingeniería-Bioingeniería, Laboratorio de Microscopía Aplicada a Estudios Moleculares y Celulares, Universidad Nacional de Entre Ríos, Paraná, Entre Ríos, Argentina
| | - Ana P Courreges
- Facultad de Farmacia y Bioquímica, Cátedra de Genética, Universidad de Buenos Aires, Buenos Aires, Argentina.,CONICET-Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Myrian R Rodriguez
- CONICET-Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Víctor H Casco
- Facultad de Ingeniería-Bioingeniería, Laboratorio de Microscopía Aplicada a Estudios Moleculares y Celulares, Universidad Nacional de Entre Ríos, Paraná, Entre Ríos, Argentina
| | - Marcelo S Vatta
- Facultad de Farmacia y Bioquímica, Cátedra de Fisiología, Universidad de Buenos Aires, Buenos Aires, Argentina.,CONICET-Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Liliana G Bianciotti
- CONICET-Instituto de Inmunología, Genética y Metabolismo (INIGEM), Universidad de Buenos Aires, Buenos Aires, Argentina. .,Facultad de Farmacia y Bioquímica, Cátedra de Fisiopatología, Universidad de Buenos Aires, Junín 956 (11 13), Buenos Aires, Argentina.
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Courreges AP, Najenson AC, Vatta MS, Bianciotti LG. Atrial natriuretic peptide attenuates endoplasmic reticulum stress in experimental acute pancreatitis. Biochim Biophys Acta Mol Basis Dis 2018; 1865:485-493. [PMID: 30529145 DOI: 10.1016/j.bbadis.2018.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 11/19/2018] [Accepted: 12/05/2018] [Indexed: 12/30/2022]
Abstract
Increasing evidence shows that the endoplasmic reticulum (ER) stress is an early event that injures pancreatic acinar cells and contributes to the pathogenesis of acute pancreatitis. In the present work we sought to establish whether atrial natriuretic peptide (ANP) alleviated ER stress in rats with cerulein-induced pancreatitis. The major components of the unfolded protein response (UPR) and their downstream effectors were assessed by immunoblotting or fluorimetry and the ultrastructure of ER evaluated by electron transmission microscopy. Cross-talk with autophagy was evaluated by beclin-1 expression. ANP reduced binding immunoglobulin protein (Bip) expression (UPR major controller) which under non-stress conditions keeps inactive the stress sensor proteins: protein kinase-like ER kinase (PERK), inositol-requiring enzyme-1 (IRE1) and activating transcription factor 6 (ATF6). Although ANP did not change PERK expression it decreased p-eIF2α and enhanced downstream effector CHOP, suggesting that ANP stimulates ER-dependent apoptosis. In accordance, ANP also decreased Bcl2 expression and enhanced proapoptotic proteins Bax and Bak. The atrial peptide enhanced ATF6 expression and although it did not affect IRE1/sXBP1 signaling, it increased caspase-2 activity, also involved in ER-dependent apoptosis. Furthermore, ANP decreased beclin-1 expression. The ultrastructure of the RE revealed decreased swelling and conserved ribosomes in the presence of ANP. Present findings support that ANP alleviates ER stress in acute pancreatitis by modulating the three branches of the UPR and stimulates ER-dependent apoptosis. Gaining insights into the modulation of ER stress may help to develop specific therapeutic strategies for acute pancreatitis and/or medical interventions at risk of its developing like endoscopic retrograde cholangiopancreatography.
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Affiliation(s)
- Ana Paula Courreges
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Ana Clara Najenson
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Marcelo S Vatta
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Cátedra de Fisiología, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA), Buenos Aires, Argentina
| | - Liliana G Bianciotti
- CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Cátedra de Fisiopatología, Buenos Aires, Argentina.
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Najenson AC, Courreges AP, Perazzo JC, Rubio MF, Vatta MS, Bianciotti LG. Atrial natriuretic peptide reduces inflammation and enhances apoptosis in rat acute pancreatitis. Acta Physiol (Oxf) 2018; 222. [PMID: 29117461 DOI: 10.1111/apha.12992] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Revised: 10/20/2017] [Accepted: 10/30/2017] [Indexed: 12/18/2022]
Abstract
AIM We previously reported that atrial natriuretic peptide (ANP) reduces serum amylase and intrapancreatic trypsinogen activation in the onset of acute pancreatitis whereas secretin increases them. In the present work, we sought to establish the effect of ANP and secretin on the inflammatory response and cell death in experimental acute pancreatitis. METHODS The expression and activity of key inflammatory mediators and apoptosis were evaluated in the presence or absence of the atrial peptide, secretin or both in cerulein-induced acute pancreatitis in rats. Also, ultrastructural changes in pancreatic acinar cells were assessed by transmission electron microscopy. RESULTS ANP significantly reduced NF-κB activation and TNF-α intrapancreatic levels. Furthermore, it decreased inducible nitric oxide synthase and cyclooxygenase 2 expression and activity while it diminished myeloperoxidase activity. ANP also stimulated apoptosis as shown by caspase-3 expression and activation as well as TUNEL assay. These findings correlated well with the ultrastructural changes observed in the exocrine pancreas. Although secretin reduced various inflammatory markers, it also diminished caspase-3 activation and the overall response was the aggravation of the disease as reflected by the ultrastructural alterations of pancreatic acinar cells. In the presence of ANP, various effects evoked by secretin were antagonized. CONCLUSION Present findings show that ANP significantly attenuated the severity of acute pancreatitis in the rat by inducing apoptosis and reducing the inflammatory response and further suggest that ANP may have eventual therapeutic implications in the disease and/or in medical interventions at risk of its developing like endoscopic retrograde cholangiopancreatography.
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Affiliation(s)
- A. C. Najenson
- Instituto de Inmunología; Genética y Metabolismo (INIGEM-CONICET-UBA); Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Buenos Aires Argentina
| | - A. P. Courreges
- Instituto de Inmunología; Genética y Metabolismo (INIGEM-CONICET-UBA); Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Buenos Aires Argentina
| | - J. C. Perazzo
- Instituto de Patología; Facultad de Medicina; Universidad de Buenos Aires; Buenos Aires Argentina
| | - M. F. Rubio
- Instituto de Investigaciones Médicas (IDIM-CONICET-UBA); Facultad de Medicina; Universidad de Buenos Aires; Buenos Aires Argentina
| | - M. S. Vatta
- Cátedra de Fisiología-Instituto de Química y Metabolismo del Fármaco (IQUIMEFA-CONICET-UBA); Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Buenos Aires Argentina
| | - L. G. Bianciotti
- Instituto de Inmunología; Genética y Metabolismo (INIGEM-CONICET-UBA); Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Buenos Aires Argentina
- Departamento de Ciencias Biológicas; Cátedra de Fisiopatología; Facultad de Farmacia y Bioquímica; Universidad de Buenos Aires; Buenos Aires Argentina
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Monczor F, Copsel S, Fernandez N, Davio C, Shayo C. Histamine H 2 Receptor in Blood Cells: A Suitable Target for the Treatment of Acute Myeloid Leukemia. Handb Exp Pharmacol 2017; 241:141-160. [PMID: 27316911 DOI: 10.1007/164_2016_8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Acute myeloid leukemia (AML) consists in a cancer of early hematopoietic cells arising in the bone marrow, most often of those cells that would turn into white blood cells (except lymphocytes). Chemotherapy is the treatment of choice for AML but one of the major complications is that current drugs are highly toxic and poorly tolerated. In general, treatment for AML consists of induction chemotherapy and post-remission therapy. If no further post-remission is given, almost all patients will eventually relapse. Histamine, acting at histamine type-2 (H2) receptors on phagocytes and AML blast cells, helps prevent the production and release of oxygen-free radicals, thereby protecting NK and cytotoxic T cells. This protection allows immune-stimulating agents, such as interleukin-2 (IL-2), to activate cytotoxic cells more effectively, enhancing the killing of tumor cells. Based on this mechanism, post-remission therapy with histamine and IL-2 was found to significantly prevent relapse of AML. Alternatively, another potentially less toxic approach to treat AML employs drugs to induce differentiation of malignant cells. It is based on the assumption that many neoplastic cell types exhibit reversible defects in differentiation, which upon appropriate treatment results in tumor reprogramming and the induction of terminal differentiation. There are promissory results showing that an elevated and sustained signaling through H2 receptors is able to differentiate leukemia-derived cell lines, opening the door for the use of H2 agonists for specific differentiation therapies. In both situations, histamine acting through H2 receptors constitutes an eligible treatment to induce leukemic cell differentiation, improving combined therapies.
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Affiliation(s)
- Federico Monczor
- Instituto de Investigaciones Farmacológicas, ININFA, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Junín 956 PP, (1113), Buenos Aires, Argentina.
| | - Sabrina Copsel
- Microbiology and Immunology Department, Miller School of Medicine, University of Miami, Miami, FL, USA
| | - Natalia Fernandez
- Instituto de Investigaciones Farmacológicas, ININFA, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Junín 956 PP, (1113), Buenos Aires, Argentina
| | - Carlos Davio
- Instituto de Investigaciones Farmacológicas, ININFA, Universidad de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Junín 956 PP, (1113), Buenos Aires, Argentina
| | - Carina Shayo
- Laboratorio de Patología y Farmacología Molecular, Instituto de Biología y Medicina Experimental, CONICET, Buenos Aires, Argentina
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Godinho RO, Duarte T, Pacini ESA. New perspectives in signaling mediated by receptors coupled to stimulatory G protein: the emerging significance of cAMP efflux and extracellular cAMP-adenosine pathway. Front Pharmacol 2015; 6:58. [PMID: 25859216 PMCID: PMC4373373 DOI: 10.3389/fphar.2015.00058] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 03/06/2015] [Indexed: 12/25/2022] Open
Abstract
G protein-coupled receptors (GPCRs) linked to stimulatory G (Gs) proteins (GsPCRs) mediate increases in intracellular cyclic AMP as consequence of activation of nine adenylyl cyclases , which differ considerably in their cellular distribution and activation mechanisms. Once produced, cyclic AMP may act via distinct intracellular signaling effectors such as protein kinase A and the exchange proteins activated by cAMP (Epacs). More recently, attention has been focused on the efflux of cAMP through a specific transport system named multidrug resistance proteins that belongs to the ATP-binding cassette transporter superfamily. Outside the cell, cAMP is metabolized into adenosine, which is able to activate four distinct subtypes of adenosine receptors, members of the GPCR family: A1, A2A, A2B, and A3. Taking into account that this phenomenon occurs in numerous cell types, as consequence of GsPCR activation and increment in intracellular cAMP levels, in this review, we will discuss the impact of cAMP efflux and the extracellular cAMP-adenosine pathway on the regulation of GsPCR-induced cell response.
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Affiliation(s)
- Rosely O Godinho
- Disciplina Farmacologia Celular, Departamento de Farmacologia, Escola Paulista de Medicina, Universidade Federal de São Paulo São Paulo, Brazil
| | - Thiago Duarte
- Disciplina Farmacologia Celular, Departamento de Farmacologia, Escola Paulista de Medicina, Universidade Federal de São Paulo São Paulo, Brazil
| | - Enio S A Pacini
- Disciplina Farmacologia Celular, Departamento de Farmacologia, Escola Paulista de Medicina, Universidade Federal de São Paulo São Paulo, Brazil
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