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Leal-Cardoso JH, Ferreira-da-Silva FW, Coelho-de-Souza AN, da Silva-Alves KS. Diabetes-induced electrophysiological alterations on neurosomes in ganglia of peripheral nervous system. Biophys Rev 2023; 15:625-638. [PMID: 37681090 PMCID: PMC10480376 DOI: 10.1007/s12551-023-01094-1] [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: 04/11/2023] [Accepted: 06/30/2023] [Indexed: 09/09/2023] Open
Abstract
Diabetes mellitus (DM) leads to medical complications, the epidemiologically most important of which is diabetic peripheral neuropathy (DPN). Electrophysiology is a major component of neural functioning and several studies have been undertaken to elucidate the neural electrophysiological alterations caused by DM and their mechanisms of action. Due to the importance of electrophysiology for neuronal function, the review of the studies dealing predominantly with electrophysiological parameters and mechanisms in the neuronal somata of peripheral neural ganglia of diabetic animals during the last 45 years is here undertaken. These studies, using predominantly techniques of electrophysiology, most frequently patch clamp for voltage clamp studies of transmembrane currents through ionic channels, have investigated the experimental DPN. They also have demonstrated that various cellular and molecular mechanisms of action of diabetic physiopathology at the level of biophysical electrical parameters are affected in DPN. Thus, they have demonstrated that several passive and active transmembrane voltage parameters, related to neuronal excitability and neuronal functions, are altered in diabetes. The majority of the studies agreed that DM produces depolarization of the resting membrane potential; alters excitability, increasing and decreasing it in dorsal root ganglia (DRG) and in nodose ganglion, respectively. They have tried to relate these changes to sensorial alterations of DPN. Concerning ionic currents, predominantly studied in DRG, the most frequent finding was increases in Na+, Ca2+, and TRPV1 cation current, and decreases in K+ current. This review concluded that additional studies are needed before an understanding of the hierarchized, time-dependent, and integrated picture of the contribution of neural electrophysiological alterations to the DPN could be reached. DM-induced electrophysiological neuronal alterations that so far have been demonstrated, most of them likely important, are either consistent with the DPN symptomatology or suggest important directions for improvement of the elucidation of DPN physiopathology, which the continuation seems to us very relevant.
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Affiliation(s)
- José Henrique Leal-Cardoso
- Laboratory of Electrophysiology, Superior Institute of Biomedical Sciences, State University of Ceará, 1700 Dr. Silas Munguba Avenue, Fortaleza, Ceará 60714-903 Brazil
| | - Francisco Walber Ferreira-da-Silva
- Laboratory of Electrophysiology, Superior Institute of Biomedical Sciences, State University of Ceará, 1700 Dr. Silas Munguba Avenue, Fortaleza, Ceará 60714-903 Brazil
- Civil Engineering Department, State University of Vale do Acaraú, Sobral, Ceará Brazil
| | - Andrelina Noronha Coelho-de-Souza
- Laboratory of Electrophysiology, Superior Institute of Biomedical Sciences, State University of Ceará, 1700 Dr. Silas Munguba Avenue, Fortaleza, Ceará 60714-903 Brazil
- Laboratory of Experimental Physiology, Superior Institute of Biomedical Sciences, State University of Ceará, Fortaleza, Ceará Brazil
| | - Kerly Shamyra da Silva-Alves
- Laboratory of Electrophysiology, Superior Institute of Biomedical Sciences, State University of Ceará, 1700 Dr. Silas Munguba Avenue, Fortaleza, Ceará 60714-903 Brazil
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da Silva‐Alves KS, Ferreira‐da‐Silva FW, Coelho‐de‐Souza AN, Weinreich D, Leal‐Cardoso JH. Diabetes mellitus differently affects electrical membrane properties of vagal afferent neurons of rats. Physiol Rep 2023; 11:e15605. [PMID: 36807809 PMCID: PMC9938008 DOI: 10.14814/phy2.15605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 01/24/2023] [Accepted: 01/26/2023] [Indexed: 02/20/2023] Open
Abstract
To study whether diabetes mellitus (DM) would cause electrophysiological alterations in nodose ganglion (NG) neurons, we used patch clamp and intracellular recording for voltage and current clamp configuration, respectively, on cell bodies of NG from rats with DM. Intracellular microelectrodes recording, according to the waveform of the first derivative of the action potential, revealed three neuronal groups (A0 , Ainf , and Cinf ), which were differently affected. Diabetes only depolarized the resting potential of A0 (from -55 to -44 mV) and Cinf (from -49 to -45 mV) somas. In Ainf neurons, diabetes increased action potential and the after-hyperpolarization durations (from 1.9 and 18 to 2.3 and 32 ms, respectively) and reduced dV/dtdesc (from -63 to -52 V s-1 ). Diabetes reduced the action potential amplitude while increasing the after-hyperpolarization amplitude of Cinf neurons (from 83 and -14 mV to 75 and -16 mV, respectively). Using whole cell patch clamp recording, we observed that diabetes produced an increase in peak amplitude of sodium current density (from -68 to -176 pA pF-1 ) and displacement of steady-state inactivation to more negative values of transmembrane potential only in a group of neurons from diabetic animals (DB2). In the other group (DB1), diabetes did not change this parameter (-58 pA pF-1 ). This change in sodium current did not cause an increase in membrane excitability, probably explainable by the alterations in sodium current kinetics, which are also induced by diabetes. Our data demonstrate that diabetes differently affects membrane properties of different nodose neuron subpopulations, which likely have pathophysiological implications for diabetes mellitus.
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Affiliation(s)
- Kerly Shamyra da Silva‐Alves
- Laboratory of Electrophysiology, Superior Institute of Biomedical SciencesState University of CearáFortalezaBrazil
| | - Francisco Walber Ferreira‐da‐Silva
- Laboratory of Electrophysiology, Superior Institute of Biomedical SciencesState University of CearáFortalezaBrazil
- Technological and Exact Science CenterState University Vale do AcaraúSobralBrazil
| | - Andrelina Noronha Coelho‐de‐Souza
- Laboratory of Electrophysiology, Superior Institute of Biomedical SciencesState University of CearáFortalezaBrazil
- Laboratory of Experimental Physiology, Superior Institute of Biomedical SciencesState University of CearáFortalezaBrazil
| | - Daniel Weinreich
- Department of PharmacologyUniversity of Maryland, School of MedicineBaltimoreMarylandUSA
| | - José Henrique Leal‐Cardoso
- Laboratory of Electrophysiology, Superior Institute of Biomedical SciencesState University of CearáFortalezaBrazil
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Machado LMQ, Serra DS, Neves TG, Cavalcante FSÁ, Ceccatto VM, Leal‐Cardoso JH, Zin WA, Moreira‐Gomes MD. Pulmonary impairment in type 2 diabetic rats and its improvement by exercise. Acta Physiol (Oxf) 2022; 234:e13708. [PMID: 34185958 DOI: 10.1111/apha.13708] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 06/24/2021] [Accepted: 06/25/2021] [Indexed: 01/24/2023]
Abstract
AIM We aimed to evaluate whether the streptozotocin-induced diabetic model can generate lung functional, histological and biochemical impairments and whether moderate exercise can prevent these changes. METHODS Wistar rats were assigned to control (CTRL), exercise (EXE), diabetic (D) and diabetic with exercise (D+EXE) groups. We used the n5-STZ model of diabetes mellitus triggered by a single injection of streptozotocin (STZ, 120 mg/kg b.w., i.p.) in newborn rats on their 5th day of life. EXE and D+EXE rats were trained by running on a motorized treadmill, 5 days a week for 9 weeks. Blood glucose, body weight, food intake, exercise capacity, lung mechanics, morphology, and antioxidant enzymatic activity were analysed. RESULTS On the 14th week of life, diabetic rats exhibited a significant impairment in post-prandial glycaemia, glucose tolerance, body weight, food intake, lung function (tissue viscance, elastance, Newtonian resistance and hysteresis), morphological parameters, redox balance and exercise capacity. Physical training completely prevented the diabetes-induced alterations, except for those on fasting blood glucose, which nevertheless remained stable. CONCLUSIONS Mild diabetes in n5-STZ-treated rats jeopardized pulmonary mechanics, morphology and redox balance, which confirms the occurrence of diabetes-induced pneumopathy. Moreover, moderate exercise completely prevented all diabetes-induced respiratory alterations.
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Affiliation(s)
- Liz Maria Queiroz Machado
- Electrophysiology Laboratory Superior Institute of Biomedical SciencesState University of Ceará Fortaleza Brazil
| | - Daniel Silveira Serra
- Laboratory of Biophysics of Respiration Science and Technology Center State University of Ceará Ceará Brazil
| | - Thayanne Gomes Neves
- Electrophysiology Laboratory Superior Institute of Biomedical SciencesState University of Ceará Fortaleza Brazil
| | | | - Vânia Marilande Ceccatto
- Gene Expression Laboratory Superior Institute of Biomedical SciencesState University of Ceará Fortaleza Brazil
| | - Jose Henrique Leal‐Cardoso
- Electrophysiology Laboratory Superior Institute of Biomedical SciencesState University of Ceará Fortaleza Brazil
| | - Walter Araujo Zin
- Laboratory of Respiration Physiology Carlos Chagas Filho Institute of BiophysicsUniversidade Federal do Rio de Janeiro Rio de Janeiro Brazil
| | - Maria Diana Moreira‐Gomes
- Electrophysiology Laboratory Superior Institute of Biomedical SciencesState University of Ceará Fortaleza Brazil
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Oliveira-Abreu K, Cipolla-Neto J, Leal-Cardoso JH. Effects of Melatonin on Diabetic Neuropathy and Retinopathy. Int J Mol Sci 2021; 23:100. [PMID: 35008523 PMCID: PMC8744787 DOI: 10.3390/ijms23010100] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/14/2021] [Accepted: 12/16/2021] [Indexed: 12/18/2022] Open
Abstract
Diabetes mellitus (DM) leads to complications, the majority of which are nephropathy, retinopathy, and neuropathy. Redox imbalance and inflammation are important components of the pathophysiology of these complications. Many studies have been conducted to find a specific treatment for these neural complications, and some of them have investigated the therapeutic potential of melatonin (MEL), an anti-inflammatory agent and powerful antioxidant. In the present article, we review studies published over the past 21 years on the therapeutic efficacy of MEL in the treatment of DM-induced neural complications. Reports suggest that there is a real prospect of using MEL as an adjuvant treatment for hypoglycemic agents. However, analysis shows that there is a wide range of approaches regarding the doses used, duration of treatment, and treatment times in relation to the temporal course of DM. This wide range hinders an objective analysis of advances and prospective vision of the paths to be followed for the unequivocal establishment of parameters to be used in an eventual therapeutic validation of MEL in neural complications of DM.
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Affiliation(s)
- Klausen Oliveira-Abreu
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil;
| | - José Cipolla-Neto
- Laboratório de Neurobiologia, Instituto de Ciências Biomédicas 1, Universidade de São Paulo, Sao Paulo 05508-000, SP, Brazil;
| | - Jose Henrique Leal-Cardoso
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil;
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Silva-Alves KS, Ferreira-da-Silva FW, Coelho-de-Souza AN, Leal-Cardoso JH. Essential Oil of Croton zehntneri Prevents Conduction Alterations Produced by Diabetes Mellitus on Vagus Nerve. PLANTS 2021; 10:plants10050893. [PMID: 33925228 PMCID: PMC8146017 DOI: 10.3390/plants10050893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 12/30/2022]
Abstract
Autonomic diabetic neuropathy (ADN) is a complication of diabetes mellitus (DM), to which there is no specific treatment. In this study, the efficacy of the essential oil of Croton zehntneri (EOCz) in preventing ADN was evaluated in the rat vagus nerve. For the two fastest conducting myelinated types of axons of the vagus nerve, the conduction velocities and rheobase decreased, whilst the duration of the components of the compound action potential of these fibers increased. EOCz completely prevented these DM-induced alterations of the vagus nerve. Unmyelinated fibers were not affected. In conclusion, this investigation demonstrated that EOCz is a potential therapeutic agent for the treatment of ADN.
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Affiliation(s)
- Kerly Shamyra Silva-Alves
- Laboratory of Electrophysiology, Superior Institute of Biomedical Science, State University of Ceará, Fortaleza CEP 60.740-000, Brazil; (K.S.S.-A.); (F.W.F.-d.-S.); (A.N.C.-d.-S.)
| | - Francisco Walber Ferreira-da-Silva
- Laboratory of Electrophysiology, Superior Institute of Biomedical Science, State University of Ceará, Fortaleza CEP 60.740-000, Brazil; (K.S.S.-A.); (F.W.F.-d.-S.); (A.N.C.-d.-S.)
- Center of Exact Sciences and Technology, State University of Vale do Acaraú, Sobral CEP 62.042-030, Brazil
| | - Andrelina Noronha Coelho-de-Souza
- Laboratory of Electrophysiology, Superior Institute of Biomedical Science, State University of Ceará, Fortaleza CEP 60.740-000, Brazil; (K.S.S.-A.); (F.W.F.-d.-S.); (A.N.C.-d.-S.)
- Laboratory of Experimental Physiology, Superior Institute of Biomedical Science, State University of Ceará, Fortaleza CEP 60.740-000, Brazil
| | - José Henrique Leal-Cardoso
- Laboratory of Electrophysiology, Superior Institute of Biomedical Science, State University of Ceará, Fortaleza CEP 60.740-000, Brazil; (K.S.S.-A.); (F.W.F.-d.-S.); (A.N.C.-d.-S.)
- Correspondence: ; Tel.: +55-85-3101-9814
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Silva-Dos-Santos NM, Oliveira-Abreu K, Moreira-Junior L, Santos-Nascimento TD, Silva-Alves KSD, Coelho-de-Souza AN, Ferreira-da-Silva FW, Leal-Cardoso JH. Diabetes mellitus alters electrophysiological properties in neurons of superior cervical ganglion of rats. Brain Res 2020; 1729:146599. [PMID: 31843626 DOI: 10.1016/j.brainres.2019.146599] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 11/22/2019] [Accepted: 12/11/2019] [Indexed: 01/08/2023]
Abstract
Diabetic neuropathy is the most prevalent complication associated with diabetes mellitus (DM). The superior cervical ganglion (SCG) is an important sympathetic component of the autonomic nervous system. We investigated the changes in cellular electrophysiological properties and on Na+K+-ATPase activity of SCG neurons of rats with DM induced by streptozotocin (STZ). Three types of action potentials (AP) firing pattern were observed in response to a long (1 s) depolarizing pulse. Whilst some neurons fired a single AP (single firing phasic, SFP), others fired few APs (multiple firing phasic, MFP). A third type fired APs during more than 80% of the stimulus duration (tonic-like, TL). The occurrence of SFP, MFP and TL was 84.5, 13.8, and 1.7%, respectively. SFP and MFP differed significantly in their membrane input resistance (Rin). At the end of the 4th week of its time course, DM differently affected most types of neurons: DM induced depolarization of resting membrane potential (RMP), decreased AP amplitude in SFP, and decreased Rin in MFP. DM decreased spike after-hyperpolarization amplitude in MFP and the duration in SFP. Based on the RMP depolarization, we investigated the Na+K+-ATPase action and observed that DM caused a significant decrease in Na+K+-ATPase activity of SCG. In conclusion, we have demonstrated that DM affects several parameters of SCG physiology in a manner likely to have pathophysiological relevance.
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Affiliation(s)
- Nathalia Maria Silva-Dos-Santos
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil
| | - Klausen Oliveira-Abreu
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil
| | | | | | - Kerly Shamyra da Silva-Alves
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil
| | - Andrelina Noronha Coelho-de-Souza
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil
| | - Francisco Walber Ferreira-da-Silva
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil
| | - José Henrique Leal-Cardoso
- Laboratório de Eletrofisiologia, Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza 60714-903, CE, Brazil.
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Ribeiro JKC, Nascimento TV, Agostinho AG, Freitas RM, Santos LHP, Machado LMQ, Leal-Cardoso JH, Moreira-Gomes MD, Ceccatto VM. Evaluation of Hypoglycemic Therapy Through Physical Exercise in n5STZ-Induced Diabetes Rats. Diabetes Metab Syndr Obes 2020; 13:991-1004. [PMID: 32280255 PMCID: PMC7132011 DOI: 10.2147/dmso.s225160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 12/17/2019] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Diabetes mellitus is a syndrome with multiple etiologies involving insulin, in which there is a lack of production and/or loss of sensitivity to this hormone resulting in insulin resistance. Treatment and control of this disease requires changes in diet, use of medication, and lifestyle, such as physical activity. These modifications may compromise quality-of-life if there is no proper guidance for the treatment or alert to possible complications caused by the disease. METHODS This study aimed to evaluate biochemical and hematological parameters, and to assess brain derived neurotrophic factor levels in diabetic Wistar rats submitted to chronic physical exercise. RESULTS The results demonstrated an increase in plasma concentration of brain-derived neurotrophic factor (BDNF) in association with hyperglycemia reduction in diabetic animals. DISCUSSION The results obtained suggest that there is a regulation of glucose homeostasis between peripheral tissues and the central nervous system. Exercise-induced BDNF also improved levels of glycemia, body weight, and dyslipidemia. In hematological evaluation, BDNF increase was positively correlated with an improvement in leukocyte parameters. Electrophoresis analyses demonstrated a reduction in levels of pro-inflammatory proteins, lipoprotein fractions, and albumin preservation in diabetic animals trained with elevated concentration of plasma BDNF. CONCLUSION In conclusion, this study demonstrated that chronic exercise was able to elevate BDNF levels in plasma, which resulted directly in positive hypoglycemic activity in diabetic animals and a reduction of the metabolic syndrome associated with diabetes mellitus.
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Affiliation(s)
- J K C Ribeiro
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - T V Nascimento
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - A G Agostinho
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - R M Freitas
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - L H P Santos
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - L M Q Machado
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - J H Leal-Cardoso
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - M D Moreira-Gomes
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
| | - V M Ceccatto
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brazil
- Correspondence: VM Ceccatto Instituto de Ciências Biomédicas, Universidade Estadual do Ceará, Av Paranjana, 1700, Fortaleza, Ceará60740-000, BrazilTel +55 85 3101 9814Fax +55 85 3101 9796 Email
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Farias VX, Uchoa PN, Aquino CP, Britto LRG, Fonteles MC, Leal-Cardoso JH, Silva-Alves KS, Havt A, Prata MMG, Heimark DB, Nascimento NRF, Santos CF. Expression of myo-inositol cotransporters in the sciatic nerve and dorsal root ganglia in experimental diabetes. ACTA ACUST UNITED AC 2019; 52:e8589. [PMID: 31166385 PMCID: PMC6556969 DOI: 10.1590/1414-431x20198589] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Accepted: 04/09/2019] [Indexed: 02/03/2023]
Abstract
The transport of myo-inositol is the main mechanism for the maintenance of its high intracellular levels. We aimed to measure the mRNA and protein levels of myo-inositol cotransporters in the sciatic nerve (SN) and dorsal root ganglia (DRG) during experimental diabetes. Streptozotocin-induced (STZ; 4, 8, and 12 weeks; 65 mg/kg; ip) diabetic rats (DB) and age-matched euglycemic (E) rats were used for the analysis of mRNA and protein levels of sodium myo-inositol cotransporters 1, 2 (SMIT1, SMIT2) or H+/myo-inositol cotransporter (HMIT). There was a significant reduction in the mRNA levels for SMIT1 in the SN and DRG (by 36.9 and 31.0%) in the 4-week DB (DB4) group compared to the E group. SMIT2 was not expressed in SN. The mRNA level for SMIT2 was up-regulated only in the DRG in the DB4 group. On the other hand, the protein level of SMIT1 decreased by 42.5, 41.3, and 44.8% in the SN after 4, 8, and 12 weeks of diabetes, respectively. In addition, there was a decrease of 64.3 and 58.0% of HMIT in membrane and cytosolic fractions, respectively, in the SN of the DB4 group. In the DRG, there was an increase of 230 and 86.3% for SMIT1 and HMIT, respectively, in the DB12 group. The levels of the main inositol transporters, SMIT1 and HMIT, were greatly reduced in the SN but not in the DRG. SMIT-1 was selectively reduced in the sciatic nerve during experimental STZ-induced diabetes.
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Affiliation(s)
- V X Farias
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - P N Uchoa
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - C P Aquino
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - L R G Britto
- Instituto de Ciências Biomédicas, Laboratório de Neurofisiologia, Universidade de São Paulo, SP, Brasil
| | - M C Fonteles
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - J H Leal-Cardoso
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - K S Silva-Alves
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - A Havt
- Instituto de Ciências Biomédicas, Universidade Federal do Ceará, Fortaleza, CE, Brasil
| | - M M G Prata
- Instituto de Ciências Biomédicas, Universidade Federal do Ceará, Fortaleza, CE, Brasil
| | - D B Heimark
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - N R F Nascimento
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
| | - C F Santos
- Instituto Superior de Ciências Biomédicas, Universidade Estadual do Ceará, Fortaleza, CE, Brasil
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Diniz LRL, Portella VG, da Silva Alves KS, Araújo PCDC, de Albuquerque Júnior RLC, Cavalcante de Albuquerque AA, Coelho-de-Souza AN, Leal-Cardoso JH. Electrophysiologic alterations in the excitability of the sciatic and vagus nerves during early stages of sepsis. J Pain Res 2018; 11:783-790. [PMID: 29731661 PMCID: PMC5927063 DOI: 10.2147/jpr.s144220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background Nonspecific and delayed diagnosis of neurologic damage contributes to the development of neuropathies in patients with severe sepsis. The present study assessed the electrophysiologic parameters related to the excitability and conductibility of sciatic and vagus nerves during early stages of sepsis. Materials and methods Twenty-four hours after sepsis induced by cecal ligation and puncture (CLP) model, sciatic and vagus nerves of septic (CLP group) and control (sham group) rats were removed, and selected electric stimulations were applied to measure the parameters of the first and second components of the compound action potential. The first component originated from fibers with motor and sensory functions (Types Aα and Aβ fibers) with a large conduction velocity (70-120 m/s), and the second component originated from fibers (Type Aγ) with sensorial function. To evaluate the presence of sensorial alterations, the sensitivity to non-noxious mechanical stimuli was measured by using the von Frey test. Hematoxylin and eosin staining of the nerves was performed. Results We observed an increase of rheobase followed by a decrease in the first component amplitude and a higher paw withdrawal threshold in response to the application of von Frey filaments in sciatic nerves from the CLP group compared to the sham group. Differently, a decrease in rheobase and an increase in the first component amplitude of vagal C fibers from CLP group were registered. No significant morphologic alteration was observed. Conclusion Our data showed that the electrophysiologic alterations in peripheral nerves vary with the fiber type and might be identified in the first 24 h of sepsis, before clinical signs of neuromuscular disorders.
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Affiliation(s)
| | - Viviane Gomes Portella
- Department of Physiology, Superior Institute of Biomedical Sciences, State University of Ceará, Fortaleza, Brazil
| | - Kerly Shamira da Silva Alves
- Department of Physiology, Superior Institute of Biomedical Sciences, State University of Ceará, Fortaleza, Brazil
| | | | | | | | | | - José Henrique Leal-Cardoso
- Department of Physiology, Superior Institute of Biomedical Sciences, State University of Ceará, Fortaleza, Brazil
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Becker M, Benromano T, Shahar A, Nevo Z, Pick CG. Changes in the basal membrane of dorsal root ganglia Schwann cells explain the biphasic pattern of the peripheral neuropathy in streptozotocin-induced diabetic rats. J Mol Neurosci 2014; 54:704-13. [PMID: 25260693 DOI: 10.1007/s12031-014-0424-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 09/11/2014] [Indexed: 10/24/2022]
Abstract
Peripheral neuropathy is one of the main complications of diabetes mellitus. The current study demonstrated the bimodal pattern of diabetic peripheral neuropathy found in the behavioral study of pain perception in parallel to the histopathological findings in dorsal root ganglia (DRGs) neurons and satellite Schwann cell basement membranes. A gradual decrease in heparan sulfate content, with a reciprocal increase in deposited laminin in the basement membranes of dorsal root ganglia Schwann cells, was shown in streptozotocin-treated rats. In addition, the characteristic biphasic pain profiles were demonstrated in diabetic rats, as shown by hypersensitivity at the third week and hyposensitivity at the tenth week post-streptozotocin injection, accompanied by a continuous decrease in the sciatic nerve conduction velocity. It appears that these basal membrane abnormalities in content of heparan sulfate and laminin, noticed in diabetic rats, may underline the primary damage in dorsal ganglion sensory neurons, simultaneously with the bimodal painful profile in diabetic peripheral neuropathy, simulating the scenario of filtration rate in diabetic kidney.
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Affiliation(s)
- Maria Becker
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, University of Tel Aviv, Tel Aviv, 69978, Israel
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