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Takarada JE, Cunha MR, Almeida VM, Vasconcelos SNS, Santiago AS, Godoi PH, Salmazo A, Ramos PZ, Fala AM, de Souza LR, Da Silva IEP, Bengtson MH, Massirer KB, Couñago RM. Discovery of pyrazolo[3,4-d]pyrimidines as novel mitogen-activated protein kinase kinase 3 (MKK3) inhibitors. Bioorg Med Chem 2024; 98:117561. [PMID: 38157838 DOI: 10.1016/j.bmc.2023.117561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/06/2023] [Accepted: 12/17/2023] [Indexed: 01/03/2024]
Abstract
The dual-specificity protein kinase MKK3 has been implicated in tumor cell proliferation and survival, yet its precise role in cancer remains inconclusive. A critical step in elucidating the kinase's involvement in disease biology is the identification of potent, cell-permeable kinase inhibitors. Presently, MKK3 lacks a dedicated tool compound for these purposes, along with validated methods for the facile screening, identification, and optimization of inhibitors. In this study, we have developed a TR-FRET-based enzymatic assay for the detection of MKK3 activity in vitro and a BRET-based assay to assess ligand binding to this enzyme within intact human cells. These assays were instrumental in identifying hit compounds against MKK3 that share a common chemical scaffold, sourced from a library of bioactive kinase inhibitors. Initial hits were subsequently expanded through the synthesis of novel analogs. The resulting structure-activity relationship (SAR) was rationalized using molecular dynamics simulations against a homology model of MKK3. We expect our findings to expedite the development of novel, potent, selective, and bioactive inhibitors, thus facilitating investigations into MKK3's role in various cancers.
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Affiliation(s)
- Jéssica E Takarada
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Micael R Cunha
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Vitor M Almeida
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Stanley N S Vasconcelos
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - André S Santiago
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Paulo H Godoi
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Anita Salmazo
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Priscila Z Ramos
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Angela M Fala
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Lucas R de Souza
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Italo E P Da Silva
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil; Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP 13083-862, Brazil
| | - Mario H Bengtson
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil; Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, SP 13083-862, Brazil
| | - Katlin B Massirer
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Rafael M Couñago
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil; Structural Genomics Consortium and Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, NC 27599, United States.
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2
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Cunha MR, Catta-Preta CMC, Takarada JE, Moreira GA, Massirer KB, Couñago RM. A novel BRET-based assay to investigate binding and residence times of unmodified ligands to the human lysosomal ion channel TRPML1 in intact cells. J Biol Chem 2023:104807. [PMID: 37172730 DOI: 10.1016/j.jbc.2023.104807] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 04/17/2023] [Accepted: 05/04/2023] [Indexed: 05/15/2023] Open
Abstract
Here we report a Bioluminescence Resonance Energy Transfer (BRET) assay as a novel way to investigate the binding of unlabeled ligands to the human Transient Receptor Potential Mucolipin 1 (hTRPML1), a lysosomal ion channel involved in several genetic diseases and cancer progression. This novel BRET assay can be used to determine equilibrium and kinetic binding parameters of unlabeled compounds to hTRPML1 using intact human-derived cells, thus complementing the information obtained using functional assays based on ion channel activation. We expect this new BRET assay to expedite the identification and optimization of cell-permeable ligands that interact with hTRPML1 within the physiologically-relevant environment of lysosomes.
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Affiliation(s)
- Micael R Cunha
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil.
| | - Carolina M C Catta-Preta
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil; Current address: Laboratory of Parasitic Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Jéssica E Takarada
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Gabriela A Moreira
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil
| | - Katlin B Massirer
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil.
| | - Rafael M Couñago
- Center of Medicinal Chemistry (CQMED), Center for Molecular Biology and Genetic Engineering (CBMEG), University of Campinas, Av. Dr. André Tosello 550, 13083-886 Campinas, Brazil; Structural Genomics Consortium and Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States.
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3
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Segretti ND, Takarada JE, Ferreira MA, da Silva Santiago A, Teodoro BVM, Damião MCFCB, Godoi PH, Cunha MR, Fala AM, Ramos PZ, Ishikawa EE, Mascarello A, Serafim RAM, Azevedo H, Guimarães CRW, Couñago RM. Discovery of novel benzothiophene derivatives as potent and narrow spectrum inhibitors of DYRK1A and DYRK1B. Bioorg Med Chem Lett 2022; 68:128764. [PMID: 35504513 DOI: 10.1016/j.bmcl.2022.128764] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/26/2022] [Accepted: 04/26/2022] [Indexed: 11/18/2022]
Abstract
The discovery of potent and selective inhibitors for understudied kinases can provide relevant pharmacological tools to illuminate their biological functions. DYRK1A and DYRK1B are protein kinases linked to chronic human diseases. Current DYRK1A/DYRK1B inhibitors also antagonize the function of related protein kinases, such as CDC2-like kinases (CLK1, CLK2, CLK4) and DYRK2. Here, we reveal narrow spectrum dual inhibitors of DYRK1A and DYRK1B based on a benzothiophene scaffold. Compound optimization exploited structural differences in the ATP-binding sites of the DYRK1 kinases and resulted in the discovery of 3n, a potent and cell-permeable DYRK1A/DYRK1B inhibitor. This compound has a different scaffold and a narrower off-target profile compared to current DYRK1A/DYRK1B inhibitors. We expect the benzothiophene derivatives described here to aid establishing DYRK1A/DYRK1B cellular functions and their role in human pathologies.
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Affiliation(s)
| | - Jéssica E Takarada
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Marcos A Ferreira
- Aché Laboratórios Farmacêuticos S.A., Guarulhos, SP 07034-904, Brazil
| | - André da Silva Santiago
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Bruno V M Teodoro
- Aché Laboratórios Farmacêuticos S.A., Guarulhos, SP 07034-904, Brazil
| | | | - Paulo H Godoi
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Micael R Cunha
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Angela M Fala
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Priscila Z Ramos
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Eloisa E Ishikawa
- Aché Laboratórios Farmacêuticos S.A., Guarulhos, SP 07034-904, Brazil
| | | | - Ricardo A M Serafim
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil
| | - Hatylas Azevedo
- Aché Laboratórios Farmacêuticos S.A., Guarulhos, SP 07034-904, Brazil.
| | | | - Rafael M Couñago
- Centro de Química Medicinal (CQMED), Centro de Biologia Molecular e Engenharia Genética (CBMEG), Universidade Estadual de Campinas (UNICAMP), Campinas, SP 13083-875, Brazil.
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4
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Bhardwaj R, Lindinger S, Neuberger A, Nadezhdin KD, Singh AK, Cunha MR, Derler I, Gyimesi G, Reymond JL, Hediger MA, Romanin C, Sobolevsky AI. Inactivation-mimicking block of the epithelial calcium channel TRPV6. Sci Adv 2020; 6:eabe1508. [PMID: 33246965 PMCID: PMC7695471 DOI: 10.1126/sciadv.abe1508] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/14/2020] [Indexed: 05/25/2023]
Abstract
Epithelial calcium channel TRPV6 plays vital roles in calcium homeostasis, and its dysregulation is implicated in multifactorial diseases, including cancers. Here, we study the molecular mechanism of selective nanomolar-affinity TRPV6 inhibition by (4-phenylcyclohexyl)piperazine derivatives (PCHPDs). We use x-ray crystallography and cryo-electron microscopy to solve the inhibitor-bound structures of TRPV6 and identify two types of inhibitor binding sites in the transmembrane region: (i) modulatory sites between the S1-S4 and pore domains normally occupied by lipids and (ii) the main site in the ion channel pore. Our structural data combined with mutagenesis, functional and computational approaches suggest that PCHPDs plug the open pore of TRPV6 and convert the channel into a nonconducting state, mimicking the action of calmodulin, which causes inactivation of TRPV6 channels under physiological conditions. This mechanism of inhibition explains the high selectivity and potency of PCHPDs and opens up unexplored avenues for the design of future-generation biomimetic drugs.
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Affiliation(s)
- Rajesh Bhardwaj
- Department of Nephrology and Hypertension and Department of Biomedical Research, University of Bern, Inselspital, Freiburgstrasse 15, CH-3010 Bern, Switzerland
| | - Sonja Lindinger
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Arthur Neuberger
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032, USA
| | - Kirill D Nadezhdin
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032, USA
| | - Appu K Singh
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032, USA
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology, Kanpur 208016, India
| | - Micael R Cunha
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Isabella Derler
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse 40, 4020 Linz, Austria
| | - Gergely Gyimesi
- Department of Nephrology and Hypertension and Department of Biomedical Research, University of Bern, Inselspital, Freiburgstrasse 15, CH-3010 Bern, Switzerland
| | - Jean-Louis Reymond
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
| | - Matthias A Hediger
- Department of Nephrology and Hypertension and Department of Biomedical Research, University of Bern, Inselspital, Freiburgstrasse 15, CH-3010 Bern, Switzerland.
| | - Christoph Romanin
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse 40, 4020 Linz, Austria.
| | - Alexander I Sobolevsky
- Department of Biochemistry and Molecular Biophysics, Columbia University, 650 West 168th Street, New York, NY 10032, USA.
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5
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Cunha MR, Bhardwaj R, Lindinger S, Butorac C, Romanin C, Hediger MA, Reymond JL. Photoswitchable Inhibitor of the Calcium Channel TRPV6. ACS Med Chem Lett 2019; 10:1341-1345. [PMID: 31531207 DOI: 10.1021/acsmedchemlett.9b00298] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 08/02/2019] [Indexed: 12/11/2022] Open
Abstract
Herein we report the first photoswitchable inhibitor of Transient Receptor Potential Vanilloid 6 (TRPV6), a selective calcium channel involved in a number of diseases and in cancer progression. By surveying analogs of a previously reported TRPV6 inhibitor appended with a phenyl-diazo group, we identified a compound switching between a weak TRPV6 inhibitor in its dark, E-diazo stereoisomer (Z/E = 3:97, IC50 ≫ 10 μM) and a potent inhibitor as the Z-diazo stereoisomer accessible reversibly by UV irradiation at λ = 365 nm (Z/E = 3:1, IC50 = 1.7 ± 0.4 μM), thereby allowing precise spatiotemporal control of inhibition. This new tool compound should be useful to deepen our understanding of TRPV6.
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Affiliation(s)
- Micael R. Cunha
- Department of Chemistry and Biochemistry, NCCR TransCure, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
| | - Rajesh Bhardwaj
- Institute of Biochemistry and Molecular Medicine, NCCR TransCure, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland & Department of Nephrology and Hypertension, University Hospital Bern, Inselspital, 3010 Bern, Switzerland
| | - Sonja Lindinger
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse
40, 4020 Linz, Austria
| | - Carmen Butorac
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse
40, 4020 Linz, Austria
| | - Christoph Romanin
- Institute of Biophysics, Johannes Kepler University Linz, Gruberstrasse
40, 4020 Linz, Austria
| | - Matthias A. Hediger
- Institute of Biochemistry and Molecular Medicine, NCCR TransCure, University of Bern, Bühlstrasse 28, 3012 Bern, Switzerland & Department of Nephrology and Hypertension, University Hospital Bern, Inselspital, 3010 Bern, Switzerland
| | - Jean-Louis Reymond
- Department of Chemistry and Biochemistry, NCCR TransCure, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
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6
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Cardoso GBC, Tondon A, Maia LRB, Cunha MR, Zavaglia CAC, Kaunas RR. In vivo approach of calcium deficient hydroxyapatite filler as bone induction factor. Mater Sci Eng C Mater Biol Appl 2019; 99:999-1006. [PMID: 30889775 DOI: 10.1016/j.msec.2019.02.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/21/2019] [Accepted: 02/15/2019] [Indexed: 11/29/2022]
Abstract
Tissue engineering combine biomaterials, cells and biologically active molecules having as a goal create functional tissues; many of the compositions are blends of a polymeric matrix with ceramic fillers, however, reduction of mechanical resistance can be a drawback on ceramic-polymer systems. In this manuscript, we investigate the potential of calcium-deficient hydroxyapatite (CDHA) whiskers, a needle shape bioceramic, to enhance mechanical and osteoconduction properties on the polymeric matrix. For this purpose, PCL scaffolds incorporating CDHA whiskers were produced by combining solvent casting and particulate leaching techniques to develop a composite scaffold that possess mechanical and biological properties which is useful for bone tissue engineering regeneration. We produced CDHA whiskers using alkaline hydrolysis of α-tricalcium phosphate and characterized by XRD, XRF and SEM. PCL/CDHA scaffolds were fabricated with a final porosity of ~70%, quantified by SEM images. Mechanical properties were evaluated by compression test. As an initial test, PCL/CDHA scaffolds were immersed in simulated body fluid to quantify apatite deposition. In vitro and in vivo studies were performed to assess cytotoxicity and bioactivity. CDHA whiskers exhibited a needle-like morphology and a Ca/P ratio equal to calcium deficient hydroxyapatite. The composite scaffolds contained interconnected pores 177 to 350 μm in size and homogeneous ceramic distribution. The addition of CDHA whiskers influences the mechanical results: higher elastic modulus and compressive strength was observed on PCL/CDHA samples. In vitro results demonstrated biocompatibility on PCL and PCL/CDHA films. In vivo data demonstrated cellular infiltration from the surrounding tissue with new bone formation that suggests bioactive potential of CDHA whiskers. Our goal was to produce a scaffold with a potential induction factor and a favorable morphology, which was proved according to this study's findings.
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Affiliation(s)
- G B C Cardoso
- State University of Campinas, Materials Engineering Department, Faculty of Mechanical Engineering, Campinas, Brazil; INCT Biofabris, Brazil.
| | - A Tondon
- Texas A&M University, College Station, United States of America
| | - L R B Maia
- School of Medicine of Jundiai, Department of Morphology and Pathology, Jundiai, Brazil
| | - M R Cunha
- School of Medicine of Jundiai, Department of Morphology and Pathology, Jundiai, Brazil
| | - C A C Zavaglia
- State University of Campinas, Materials Engineering Department, Faculty of Mechanical Engineering, Campinas, Brazil; INCT Biofabris, Brazil
| | - R R Kaunas
- Texas A&M University, College Station, United States of America
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Munhoz MAS, Hirata HH, Plepis AMG, Martins VCA, Cunha MR. Use of collagen/chitosan sponges mineralized with hydroxyapatite for the repair of cranial defects in rats. Injury 2018; 49:2154-2160. [PMID: 30268514 DOI: 10.1016/j.injury.2018.09.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 09/09/2018] [Indexed: 02/02/2023]
Abstract
In traumatology, we encounter several clinical challenges that involve extensive bone loss primarily related to trauma, conditions that can be treated with autologous grafts. A good alternative is the use of synthetic biomaterials as substitutes. These polymers provide a suitable environment for the growth of new bone and vascular tissue, which are essential for repair. Collagen/hydroxyapatite composites have proven to be biocompatible and to behave mechanically. Furthermore, the addition of chitosan contributes to the formation of a three-dimensional structure that permits cell adhesion and proliferation, thus improving osteogenesis. The aim of this study was to evaluate bone formation during the repair of bone defects experimentally induced in the skull of rats and grafted with a polymer blend consisting of bovine tendon collagen and chitosan combined with hydroxyapatite. Thirty animals were used for the creation of a defect in the left parietal bone and were divided into three groups of 10 animals each: a control group without biomaterial implantation, a group receiving the blend of collagen and chitosan, and a group receiving this blend combined with hydroxyapatite. Each group was subdivided and the animals were sacrificed 3 or 8 weeks after surgery. After sacrifice, the skulls were removed for macroscopic photodocumentation and radiographic examination. The samples were processed for histological evaluation of new bone formation at the surgical site. Macroscopic and radiographic analysis demonstrated the biocompatibility of the blends. Histologically, the formation of new bone occurred in continuity with the edges of the defect, with the observation of higher volumes in the grafted groups compared to control. Mineralization of sponges did not stimulate bone neoformation, with bone repair being incomplete over the experimental period. In conclusion, mineralization by the addition of hydroxyapatite should be better studied. However, the collagen/chitosan sponges used in this study are suitable to stimulate osteogenesis in cranial defects, although this process is slow and not sufficient to achieve complete bone regeneration over a short period of time.
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Affiliation(s)
- M A S Munhoz
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Jundiaí, CEP. 13202-550, Cx. Postal 1295, SP, Brazil; Postgraduate Program Interunidades in Bioengineering (EESC/FMRP /IQSC) (EESC/FMRP/IQSC), University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos-SP, Brazil. CEP: 13566-590
| | - H H Hirata
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Jundiaí, CEP. 13202-550, Cx. Postal 1295, SP, Brazil; Postgraduate Program Interunidades in Bioengineering (EESC/FMRP /IQSC) (EESC/FMRP/IQSC), University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos-SP, Brazil. CEP: 13566-590
| | - A M G Plepis
- Institute of Chemistry of São Carlos, IQSC, University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos, SP, CEP: 13566-590, Brazil; Postgraduate Program Interunidades in Bioengineering (EESC/FMRP /IQSC) (EESC/FMRP/IQSC), University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos-SP, Brazil. CEP: 13566-590
| | - V C A Martins
- Institute of Chemistry of São Carlos, IQSC, University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos, SP, CEP: 13566-590, Brazil
| | - M R Cunha
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Jundiaí, CEP. 13202-550, Cx. Postal 1295, SP, Brazil; Postgraduate Program Interunidades in Bioengineering (EESC/FMRP /IQSC) (EESC/FMRP/IQSC), University São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos-SP, Brazil. CEP: 13566-590.
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8
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Fernandes TB, Cunha MR, Sakata RP, Candido TM, Baby AR, Tavares MT, Barbosa EG, Almeida WP, Parise-Filho R. Synthesis, Molecular Modeling, and Evaluation of Novel Sulfonylhydrazones as Acetylcholinesterase Inhibitors for Alzheimer's Disease. Arch Pharm (Weinheim) 2017; 350. [PMID: 28940630 DOI: 10.1002/ardp.201700163] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 09/01/2017] [Accepted: 09/05/2017] [Indexed: 12/19/2022]
Abstract
Alzheimer's disease (AD) is the most common type of dementia and related to the degeneration of hippocampal cholinergic neurons, which dramatically affects cognitive ability. Acetylcholinesterase (AChE) inhibitors are employed as drugs for AD therapy. Three series of sulfonylhydrazone compounds were designed, and their ability to inhibit AChE was evaluated. Fifteen compounds were synthesized and twelve of them had IC50 values of 0.64-51.09 μM. The preliminary structure-activity relationships indicated that the methylcatechol moiety and arylsulfonyl substituents generated better compounds than both the benzodioxole and alkylsulfonyl chains. Molecular dynamics studies of compound 6d showed that the interaction with the peripheral binding site of AChE was similar to donepezil, which may explain its low IC50 (0.64 μM). Furthermore, the drug-likeness of 6d suggests that the compound may have appropriate oral absorption and brain penetration. Compound 6d also presented antiradical activity and was not cytotoxic to LL24 cells, suggesting that this compound might be considered safe. Our findings indicate that arylsulfonylhydrazones may be a promising scaffold for the design of new drug candidates for the treatment of AD.
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Affiliation(s)
- Thais B Fernandes
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
| | - Micael R Cunha
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
| | - Renata P Sakata
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of Campinas, Campinas, Brazil
| | - Thalita M Candido
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
| | - André R Baby
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
| | - Maurício T Tavares
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
| | - Euzébio G Barbosa
- Health Sciences Centre, Department of Pharmacy, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Wanda P Almeida
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of Campinas, Campinas, Brazil
| | - Roberto Parise-Filho
- Faculty of Pharmaceutical Sciences, Department of Pharmacy, University of São Paulo, São Paulo, Brazil
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Esquete P, Cunha MR. The Apseudomorpha (Crustacea: Tanaidacea) of the Gulf of Cadiz and Horseshoe Continental Rise (NE Atlantic): A taxonomic review with new records, species, and ecological data. Zootaxa 2017; 4276:61-95. [PMID: 28610216 DOI: 10.11646/zootaxa.4276.1.3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Indexed: 11/04/2022]
Abstract
The apseudomorphan tanaidaceans of the deep sea have been under-studied, especially in chemosynthetic habitats. A total of ten species present in the Gulf of Cadiz and the Horseshoe Continental Rise (SW off the Iberian Peninsula) are listed here, and new distribution data, ecological remarks and description of one new species of Atlantapseudes (Atlantapseudes curvatus sp. nov.) from recent research cruises are added. Pseudosphyrapus azorensis and Francapseudes uniarticulatus are recorded for the first time since the original descriptions. Notes on morphological development of Leviapseudes segonzaci and intraspecific variation of F. uniarticulatus are included, together with illustrations and descriptions of the material from the Gulf of Cadiz to complement previous descriptions.
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Affiliation(s)
- P Esquete
- Departamento de Biologia & CESAM (Center of Environmental and Marine Studies). Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro Portugal..
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Dias IM, Cúrdia J, Cunha MR, Santos MN, Carvalho S. Temporal variability in epifaunal assemblages associated with temperate gorgonian gardens. Mar Environ Res 2015; 112:140-151. [PMID: 26525873 DOI: 10.1016/j.marenvres.2015.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 10/09/2015] [Accepted: 10/15/2015] [Indexed: 06/05/2023]
Abstract
The present study is one of the few that investigate the temporal variability of epifaunal assemblages associated with coral species, particularly the octocorals Eunicella gazella and Leptogorgia lusitanica in south Portugal. The results suggest time rather than colony size as a primary driver of the ecological patterns of these assemblages, which were dominated by amphipods, molluscs and polychaetes. Temporal variability was linked to changes in environmental parameters, namely temperature, chlorophyll a and particulate organic carbon. Hence, temporal variability must be taken into account for the design of future biodiversity assessment studies, as different patterns may be observed depending on the sampling time. Associated epifaunal assemblages were consistently dominated by resident species (i.e. species present in all sampling periods) and a peak of rare species was observed in the transition from spring to summer following the increase in seawater temperature. Turnover was particularly high in the transition between the spring and summer periods. In both hosts, turnover was higher in the small sized colonies, which harboured less diverse and less abundant assemblages that also differed from those inhabiting larger size colonies. The high levels of diversity associated with gorgonian colonies highlight the need for the conservation of this priority habitat.
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Affiliation(s)
- I M Dias
- Departamento de Biologia & CESAM, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
| | - J Cúrdia
- Departamento de Biologia & CESAM, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal; IPMA, Instituto Português do Mar e da Atmosfera, Av. 5 de Outubro, s/n, 8700-305 Olhão, Portugal; King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia
| | - M R Cunha
- Departamento de Biologia & CESAM, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
| | - M N Santos
- IPMA, Instituto Português do Mar e da Atmosfera, Av. 5 de Outubro, s/n, 8700-305 Olhão, Portugal
| | - S Carvalho
- IPMA, Instituto Português do Mar e da Atmosfera, Av. 5 de Outubro, s/n, 8700-305 Olhão, Portugal; King Abdullah University of Science and Technology (KAUST), Biological and Environmental Sciences and Engineering, Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia.
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Hirata HH, Munhoz MAS, Plepis AMG, Martins VCA, Santos GR, Galdeano EA, Cunha MR. Feasibility study of collagen membranes derived from bovine pericardium and intestinal serosa for the repair of cranial defects in ovariectomised rats. Injury 2015; 46:1215-22. [PMID: 25920373 DOI: 10.1016/j.injury.2015.03.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 02/26/2015] [Accepted: 03/30/2015] [Indexed: 02/02/2023]
Abstract
The indication of biomaterials has increased substantially in the regenerative therapy of bone defects. However, in addition to evaluating the physicochemical properties of biomaterials, the quality of the recipient tissue is also essential for the osseointegration of implants, as abnormalities in bone metabolism, such as gonadal hormone deficiency, can influence bone healing. This study evaluated the osteoregenerative capacity of collagen membranes derived from bovine pericardium and intestinal serosa in the repair of cranial defects in ovariectomised rats. Thirty female Wistar rats were submitted to surgical creation of a 5-mm cranial bone defect. The rats were divided into a control group (not ovariectomised) and an ovariectomised group. The non-ovariectomised group was divided into three subgroups: control (G1) in which the defect was not filled with the biomaterial, and two subgroups (G2 and G3) that received the bovine pericardium- and serosa-derived collagen membranes, respectively. The ovariectomised group was divided into the same subgroups (G4, G5, and G6). The animals were sacrificed 8 weeks after surgery. The calvaria were removed for macroscopic and radiographic photodocumentation and processed for histomorphometric analysis of bone healing at the surgical site. Macroscopic, radiological, and microscopic analyses demonstrated the biocompatibility of the implanted collagen membranes, as indicated by the absence of infiltration and signs of inflammation at the surgical site. Histologically, discrete immature bone neoformation projecting from the margins of the defect was observed at the surgical site in ovariectomised groups when compared to the non-ovariectomised groups. The volume of newly formed bone was significantly higher in the non-ovariectomised groups (G1: 7.83%±1.32; G2: 21.33%±1.96; and G3: 22.83%±0.98) compared to the respective ovariectomised subgroups (G4: 3.16%±0.75; G5: 16.83%±0.98; and G6: 16.16%±0.75), thus demonstrating the deleterious effects of ovariectomy on bone homeostasis. Higher volumes of newly formed bone were observed in the groups receiving the membrane grafts (G2, G3, G5, and G6) compared to the control groups (G1 and G4). In conclusion, the bilateral ovariectomy compromises the ability to repair bone lesions grafted with osteoconductive biomaterials as in the case of collagen membranes derived from both bovine pericardium and intestinal serosa.
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Affiliation(s)
- H H Hirata
- Programa de Pós Graduação Interunidades Bioengenharia, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil; Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Cx. Postal 1295, Jundiaí CEP. 13202-550, SP, Brazil.
| | - M A S Munhoz
- Programa de Pós Graduação Interunidades Bioengenharia, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil; Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Cx. Postal 1295, Jundiaí CEP. 13202-550, SP, Brazil.
| | - A M G Plepis
- Programa de Pós Graduação Interunidades Bioengenharia, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil; Instituto de Química de São Carlos, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil.
| | - V C A Martins
- Instituto de Química de São Carlos, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil.
| | - G R Santos
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Cx. Postal 1295, Jundiaí CEP. 13202-550, SP, Brazil.
| | - E A Galdeano
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Cx. Postal 1295, Jundiaí CEP. 13202-550, SP, Brazil.
| | - M R Cunha
- Programa de Pós Graduação Interunidades Bioengenharia, Universidade de São Paulo, USP, Av. Trabalhador São Carlense, 400, São Carlos CEP: 13566-590, SP, Brazil; Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, Rua Francisco Telles, 250, Vila Arens, Cx. Postal 1295, Jundiaí CEP. 13202-550, SP, Brazil.
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Vieira RP, Cunha MR. In situ observation of chimaerid species in the Gorringe Bank: new distribution records for the north-east Atlantic Ocean. J Fish Biol 2014; 85:927-932. [PMID: 24976453 DOI: 10.1111/jfb.12444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 05/13/2014] [Indexed: 06/03/2023]
Abstract
In the framework of the R.V. Nautilus exploration programme, remotely operated vehicle (ROV) surveys were conducted at bathyal depths in the Gorringe Bank. Video transects revealed the presence of the chimaerids Chimaera opalescens and Hydrolagus affinis in the region. An identification key for the north-east Atlantic species of the family Chimaeridae is proposed.
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Affiliation(s)
- R P Vieira
- Departamento de Biologia & CESAM, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193, Aveiro, Portugal; Ocean and Earth Science, National Oceanography Centre, Southampton, European Way, Southampton, SO14 3ZH, U.K
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Alves LI, Davini E, Correia MR, Fukui RT, Santos RF, Cunha MR, Rocha DM, Volpini WMG, Silva MER. Autoantibodies and high-risk HLA susceptibility markers in first-degree relatives of Brazilian patients with type 1 diabetes mellitus: a progression to disease based study. J Clin Immunol 2012; 32:778-85. [PMID: 22402866 DOI: 10.1007/s10875-012-9673-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Accepted: 02/15/2012] [Indexed: 01/21/2023]
Abstract
PURPOSE The objective of this study was to determine the frequencies of autoantibodies to heterogeneous islet-cell cytoplasmic antigens (ICA), glutamic acid decarboxylase(65) (GAD(65)A), insulinoma-associated antigen-2 (IA-2A) and insulin (IAA)-and human leukocyte antigen (HLA) class II markers (HLA-DR and -DQ) in first degree relatives of heterogeneous Brazilian patients with type I diabetes (T1DM). A major focus of this study was to determine the influence of age, gender, proband characteristics and ancestry on the prevalence of autoantibodies and HLA-DR and -DQ alleles on disease progression and genetic predisposition to T1DM among the first-degree relatives. METHODS IAA, ICA, GAD(65)A, IA-2A and HLA- class II alleles were determined in 546 first-degree-relatives, 244 siblings, 55 offspring and 233 parents of 178 Brazilian patients with T1DM. RESULTS Overall, 8.9% of the relatives were positive for one or more autoantibodies. IAA was the only antibody detected in parents. GAD(65) was the most prevalent antibody in offspring and siblings as compared to parents and it was the sole antibody detected in offspring. Five siblings were positive for the IA-2 antibody. A significant number (62.1%) of siblings had 1 or 2 high risk HLA haplotypes. During a 4-year follow-up study, 5 siblings (expressing HLA-DR3 or -DR4 alleles) and 1 offspring positive for GAD(65)A progressed to diabetes. CONCLUSIONS The data indicated that the GAD(65) and IA-2 antibodies were the strongest predictors of T1DM in our study population. The high risk HLA haplotypes alone were not predictive of progression to overt diabetes.
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Affiliation(s)
- L I Alves
- Laboratory of Medical Investigation LIM-18, Ambulatory of Endocrinology of Hospital das Clinicas of University São Paulo Medical School, São Paulo, Brazil
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Martins RA, Cunha MR, Neves AP, Martins M, Teixeira-Veríssimo M, Teixeira AM. Effects of aerobic conditioning on salivary IgA and plasma IgA, IgG and IgM in older men and women. Int J Sports Med 2010; 30:906-12. [PMID: 19941250 DOI: 10.1055/s-0029-1237389] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
As people age, they experience a decline in immune responses. Unusually heavy acute or chronic exercise could increase the risk of upper respiratory tract infection (URTI) whereas regular moderate physical activity may reduce URTI symptomatology. The purpose of the present study was to determine whether an aerobic exercise program would promote chronic adaptations in plasma IgA, IgG and IgM, and salivary IgA (Sal-IgA) in both elderly women and men. Forty-three independently living men and women, aged between 65 and 96 years, were randomly assigned to an aerobic exercising or a control group. Each participant underwent three evaluations (pre, post at 16 weeks and follow-up at 32 weeks). The aerobic exercise group increased resting plasma IgA concentration from 1.08 g. L (-1)+/-0.50 g. L (-1) to 2.29 g. L (-1)+/-0.93 g. L (-1), whereas salivary IgA concentration was unchanged. The control group maintained the plasma IgA values but experienced a decrease in Sal-IgA. The IgG and IgM plasma concentrations increased in both groups, however, only the exercise group maintained higher values in the final follow-up evaluation. Regular aerobic exercise may be effective in promoting IgA immunity and protecting against the deterioration in Sal-IgA values observed in the control group. No gender differences in the immunoglobulin responses to aerobic training were observed.
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Affiliation(s)
- R A Martins
- University of Coimbra, Faculdade de Ciências do desporto e Educação Física, Centro de Estudos Biocinéticos, Coimbra, Portugal
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Cunha MR, Silva MER, Machado HA, Fukui RT, Correia MRS, Santos RF, Wajchenberg BL, Rocha DM, Rondon MUPB, Negrão CE, Ursich MJM. Cardiovascular, metabolic and hormonal responses to the progressive exercise performed to exhaustion in patients with type 2 diabetes treated with metformin or glyburide. Diabetes Obes Metab 2008; 10:238-45. [PMID: 18269639 DOI: 10.1111/j.1463-1326.2006.00690.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate the effects of Metformin and Glyburide on cardiovascular, metabolic and hormonal parameters during progressive exercise performed to exhaustion in the post-prandial state in women with type 2 diabetes (T2DM). DESIGN AND METHODS Ten T2DM patients treated with Metformin (M group), 10 with Glyburide (G group) and 10 age-paired healthy subjects exercised on a bicycle ergometer up to exercise peak. Cardiovascular and blood metabolic and hormonal parameters were measured at times -60 min, 0 min, exercise end, and at 10 and 20 minutes of recovery phase. Thirty minutes before the exercise, a standard breakfast was provided to all participants. The diabetic patients took Metformin or Glyburide before or with meal. RESULTS Peak oxygen uptake (VO(2)) was lower in patients with diabetes. Plasma glucose levels remained unchanged, but were higher in both diabetic groups. Patients with diabetes also presented lower insulin levels after meals and higher glucagon levels at exercise peak than C group. Serum cortisol levels were higher in G than M group at exercise end and recovery phase. Lactate levels were higher in M than G group at fasting and in C group at exercise peak. Nor epinephrine, GH and FFA responses were similar in all 3 groups. CONCLUSION Progressive exercise performed to exhaustion, in the post-prandial state did not worsen glucose control during and after exercise. The administration of the usual dose of Glyburide or Metformin to T2DM patients did not influence the cardiovascular, metabolic and hormonal response to exercise.
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Affiliation(s)
- M R Cunha
- Laboratory of Medical Investigation LIM-18, and Endocrine Service, Hospital das Clinicas - University of São Paulo Medical School, São Paulo, Brazil.
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Cunha MR, da Silva MER, Machado HA, Fukui RT, Correa MRS, Santos RF, Wajchenberg BL, Rondon MUPB, Negrão CE, Ursich MJM. The effects of metformin and glibenclamide on glucose metabolism, counter-regulatory hormones and cardiovascular responses in women with Type 2 diabetes during exercise of moderate intensity. Diabet Med 2007; 24:592-9. [PMID: 17381497 DOI: 10.1111/j.1464-5491.2007.02117.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIMS To compare the effects of metformin and glibenclamide on cardiovascular, metabolic and hormonal parameters during exercise of moderate intensity performed in the postprandial state, in women with Type 2 diabetes. METHODS Ten patients treated with metformin, 10 with glibenclamide and 10 control subjects (C) exercised on a bicycle ergometer at 50% of oxygen uptake (VO(2)) peak for 45 min. Cardiovascular, blood metabolic and hormonal parameters were determined at times -60 min (fasting), 0, +15, +30, +45 min (exercise) and at +60, +90 min (recovery). Thirty minutes prior to exercise, participants consumed a standard breakfast. Patients with diabetes took metformin or glibenclamide before the meal. RESULTS Systolic and diastolic blood pressure and plasma glucose were higher in both diabetic groups, for the whole experiment. Blood glucose did not change during exercise in the three groups and increased at recovery only in the control group. Plasma glucagon concentrations at the end of exercise and recovery, and plasma lactate concentrations at recovery were higher in the metformin group. Insulin, noradrenaline, growth hormone, cortisol and free fatty acid responses were similar in all three groups. CONCLUSIONS Our results suggest that the usual dose of glibenclamide and metformin can be taken safely before postprandial exercise of moderate intensity without affecting cardiovascular, metabolic and hormonal responses. However, after exercise, glibenclamide and metformin prevent the normal rise in blood glucose and metformin delays the fall in plasma lactate concentrations.
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Affiliation(s)
- M R Cunha
- Laboratory of Medical Investigation LIM-18, Hospital das Clinicas, University of Sao Paulo Medical School, Sao Paulo, Brazil.
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Cunha MR, Moreira MH, Sorbe JC. Predicting amphipods' brood size variation in brackish environments: an empirical model for Corophium multisetosum Stock, 1952 (Corophiidae) in Ria de Aveiro (NW Portugal). J Exp Mar Biol Ecol 2000; 248:207-223. [PMID: 10771303 DOI: 10.1016/s0022-0981(00)00164-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Data on fecundity of Corophium multisetosum from Areão (Ria de Aveiro, Portugal) are analysed by non linear regression to quantify the relationship between brood size (N(e)) and head length (L(h), in mm), water temperature (T, in degrees Celsius) and salinity (S, in psu). The aim of the analysis is to obtain a simple line N(e)=a+bL(h), in which the slope (b) and the y intercept (a) are functions of salinity and/or temperature on each sampling occasion. The equation N(e)=(-2.940-8.027S)+(-89.431+18.171S+12.904T-0.368T(2))L(h) explains 64% of the variability of brood size throughout the breeding period. The model predicts an optimal temperature around 18 degrees C and a very low fecundity at low salinities. The graphical comparison of the lines obtained by the model and by a usual linear regression illustrates its potential usefulness to predict fecundity changes. The authors suggest that the observed variation in the fecundity of other brackish-water amphipods can be described and predicted using similar models.
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Affiliation(s)
- MR Cunha
- Departamento de Biologia, Universidade de Aveiro, P-3810-193, Aveiro, Portugal
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