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Nascimento RC, Melo GB, Fonseca PDM, Gryschek RCB, Paula FM. Evaluation of targets for Strongyloides genus specific molecular diagnosis in experimental strongyloidiasis. Exp Parasitol 2021; 230:108157. [PMID: 34543651 DOI: 10.1016/j.exppara.2021.108157] [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: 09/29/2020] [Revised: 09/13/2021] [Accepted: 09/13/2021] [Indexed: 11/18/2022]
Abstract
Strongyloides venezuelensis has been used in different experimental studies, such as those aimed at the evaluation of diagnostic techniques for human strongyloidiasis, mainly the molecular diagnosis. In this study, three regions (genus, 18S and 28S targets) of Strongyloides ribosomal DNA were evaluated for the molecular diagnosis of experimental strongyloidiasis. Rats were infected subcutaneously with 400 or 4000 S. venezuelensis infective larvae (400iL3 and 4000iL3), and kept for 35 days. Fecal samples were collected daily to count eggs per gram of feces (EPG) and to perform the polymerase chain reaction (PCR). Egg count started on the 5th day post-infection (pi) and ended on days 33 and 34 pi, in 400iL3 and 4000iL3 groups, respectively. Based in EPG, fecal samples were selected from days 2, 5, 8, 11, 15, 23 and 35 pi for DNA extraction; PCR (genus, 18S and 28S); and sequencing. The PCR-28S products showed higher values of identity (95-100%) in the database with the Strongyloides sequences. Therefore, it is possible to reinforce the application of PCR-28S in the diagnosis of experimental and human strongyloidiasis.
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Affiliation(s)
- Rafael C Nascimento
- Laboratório de Investigação Médica (LIM-06) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil; Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, Brazil
| | - Gessica B Melo
- Laboratório de Investigação Médica (LIM-06) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil; Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, Brazil
| | - Priscilla D M Fonseca
- Laboratório de Investigação Médica (LIM-06) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil; Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, Brazil
| | - Ronaldo C B Gryschek
- Laboratório de Investigação Médica (LIM-06) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil; Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, Brazil
| | - F M Paula
- Laboratório de Investigação Médica (LIM-06) do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, Brazil; Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, Brazil.
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Fonseca PDM, Corral MA, Cosenza-Contreras M, Meisel DMCL, Melo GB, Antunes MMS, Santo MCE, Gryschek RCB, Costa-Cruz JM, Castro-Borges W, Paula FM. Corrigendum to "Shotgun proteomics of Strongyloides venezuelensis infective third stage larvae: Insights into host-parasite interaction and novel targets for diagnostic" [Mol. Biochem. Parasitol. 235 (2020) 111249]. Mol Biochem Parasitol 2020; 240:111262. [PMID: 32029293 DOI: 10.1016/j.molbiopara.2020.111262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Priscilla D M Fonseca
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil; Instituto De Medicina Tropical Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Marcelo A Corral
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Miguel Cosenza-Contreras
- Laboratório De Enzimologia e Proteômica, Instituto De Ciências Exatas e Biológicas, Universidade Federal De Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Dirce M C L Meisel
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Gessica B Melo
- Instituto De Medicina Tropical Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Milena M S Antunes
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Maria C E Santo
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Ronaldo C B Gryschek
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil; Instituto De Medicina Tropical Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil
| | - Julia M Costa-Cruz
- Laboratório De Diagnostico De Parasitoses, Instituto De Ciências Biomédicas Da Universidade De Federal De Uberlândia, Uberlândia, Minas Gerais, Brazil
| | - William Castro-Borges
- Laboratório De Enzimologia e Proteômica, Instituto De Ciências Exatas e Biológicas, Universidade Federal De Ouro Preto, Ouro Preto, Minas Gerais, Brazil
| | - Fabiana M Paula
- Laboratório De Investigação Médica Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil; Instituto De Medicina Tropical Da Faculdade De Medicina Da Universidade De São Paulo, São Paulo, Brazil.
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Silva MDRA, Melo GB, Malta FM, Abdala E, Costa SF, Pierrotti LC, Gonçalves EM, Castilho VL, Chieffi PP, Gryschek RC, Paula FM. Subtypes of Blastocystis sp. isolated in fecal samples from transplant candidates in São Paulo, Brazil. Parasite Epidemiol Control 2019; 8:e00128. [PMID: 31886425 PMCID: PMC6920191 DOI: 10.1016/j.parepi.2019.e00128] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/21/2019] [Accepted: 11/26/2019] [Indexed: 01/25/2023] Open
Abstract
Blastocystis sp. is an intestinal protozoan commonly found in fecal samples of many animal species, including humans, but poorly studied in transplant candidates. The aim of this study was to evaluate the occurrence and molecular identification of Blastocystis sp. in fecal samples from transplant candidates. A polymerase chain reaction was performed using specific primers for Blastocystis ribosomal DNA. The DNA sequences obtained were aligned and compared with other sequences from the GenBank and MLST databases. The analyzed samples showed a positivity of 16% (24 of 150) for Blastocystis sp. The highest occurrence was observed in renal transplant candidates (31.4%), followed by hepatic transplant candidates (10.4%) and candidates for bone marrow transplantation (5.9%). Subtype (ST) 3 (45.8%) was the most prevalent among the isolates, followed by ST1 (37.5%), ST2 (12.5%), and ST7 (4.2%). This is the first study of molecular identification Blastocystis sp. in transplant candidates. Our results confirmed that ST3 was the most common subtype in transplant candidates and reinforce the importance of new studies to investigate of Blastocystis sp. in these patients.
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Affiliation(s)
- Maria do Rosário A. Silva
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Gessica B. Melo
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Fernanda M. Malta
- Laboratório de Gastroenterologia e Hepatologia Tropical (LIM-07), Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Edson Abdala
- Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Silvia F. Costa
- Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Ligia C. Pierrotti
- Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Elenice M.N. Gonçalves
- Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Vera L.P. Castilho
- Hospital das Clínicas, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Pedro P. Chieffi
- Faculdade de Ciências Médicas da Santa Casa de São Paulo, São Paulo, Brazil
| | - Ronaldo C.B. Gryschek
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Fabiana M. Paula
- Laboratório de Imunopatologia da Esquistossomose (LIM-06), Instituto de Medicina Tropical, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
- Corresponding author.
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Paula FM, Malta FM, Marques PD, Melo GB, Corral MA, Gottardi M, Pinho JRR, Gonçalves EMN, Castilho VLP, Pierrotti LC, Abdala E, Costa SF, Chieffi PP, Gryschek RCB. Molecular diagnosis of Strongyloides stercoralis among transplant candidates. Transpl Infect Dis 2018; 20:e12909. [PMID: 29679429 DOI: 10.1111/tid.12909] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 05/18/2017] [Revised: 02/22/2018] [Accepted: 03/25/2018] [Indexed: 11/29/2022]
Abstract
Strongyloidiasis can occur without any symptoms or as a potentially fatal hyperinfection or disseminated infection, principally in immunosuppressed patients. Our study aimed to evaluate the application of conventional polymerase chain reaction (cPCR) and real-time PCR (qPCR). Polymerase chain reaction (PCR) and real-time PCR (qPCR) targeting the 18S rRNA gene for detection of Strongyloides stercoralis infection among transplant candidates were applied in stool samples obtained from 150 transplant candidates, preliminarily analyzed by parasitological methods. S. stercoralis larvae were visualized in 15/150 (10.0%) transplant candidates by parasitological methods. DNA from S. stercoralis was amplified in 26/150 (17.3%) and 49/150 (32.7%) stool samples of transplant candidates, using cPCR and qPCR, respectively. The results suggest that molecular methods, especially qPCR, should be used as an additional tool for diagnostic of S. stercoralis infection among transplant candidates.
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Affiliation(s)
- Fabiana M Paula
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil.,Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil
| | - Fernanda M Malta
- Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil.,Laboratório de Investigação Médica (LIM/07 - Laboratório de Gastroenterologia e Hepatologia Tropical), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | - Priscilla D Marques
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil.,Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil
| | - Gessica B Melo
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil.,Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil
| | - Marcelo A Corral
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | - Maiara Gottardi
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | - João R R Pinho
- Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil.,Laboratório de Investigação Médica (LIM/07 - Laboratório de Gastroenterologia e Hepatologia Tropical), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | - Elenice M N Gonçalves
- Seção de Parasitologia da Divisão de Laboratório Central, Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | - Vera L P Castilho
- Seção de Parasitologia da Divisão de Laboratório Central, Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil
| | | | | | | | - Pedro P Chieffi
- Faculdade de Ciências Médicas, Santa Casa, São Paulo, Brazil
| | - Ronaldo C B Gryschek
- Laboratório de Investigação Médica (LIM/06 - Laboratório de Imunopatologia da Esquistossomose), Hospital das Clínicas da Faculdade de Medicina, USP, São Paulo, Brazil.,Instituto de Medicina Tropical de São Paulo, USP, São Paulo, Brazil.,Faculdade de Medicina, USP, São Paulo, Brazil
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Melo GB, Bispo PJM, Yu MCZ, Pignatari ACC, Höfling-Lima AL. Microbial profile and antibiotic susceptibility of culture-positive bacterial endophthalmitis. Eye (Lond) 2011; 25:382-7; quiz 388. [PMID: 21336253 DOI: 10.1038/eye.2010.236] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To assess the distribution of microorganisms isolated from patients with bacterial endophthalmitis and their antimicrobial susceptibility. METHODS Retrospective analysis of medical and microbiological records of patients with suspected diagnosis of endophthalmitis. The following information was assessed: number of presumed and culture-positive endophthalmitis cases, source of infection, microbiological result (aqueous and/or vitreous culture and Gram staining), microbial characterization and distribution, and antimicrobial susceptibility. RESULTS A total of 107 (46%) of 231 patients with bacterial endophthalmitis showed positive results by gram stain or culture. Of these, 97 (42%) patients were positive for culture only. Most of them (62%) were secondary to a surgical procedure (postoperative), 12% were posttraumatic and 26% were secondary to an unknown source or the data were unavailable. A total of 100 microorganisms were isolated (38 aqueous and 67 vitreous samples) from the 97 culture-positive cases (91% were gram-positive and 9% were gram-negative). Coagulase-negative Staphylococcus(CoNS) (48%) were the most frequently isolated, followed by Stretococcus viridans(18%), and Staphylococcus aureus(13%). The antimicrobial susceptibility for CoNS was as follows: amikacin-91.6%, cephalothin-97.9%, ceftriaxone-50%, ciprofloxacin-62.5%, chloramphenicol-91.8%, gatifloxacin-79.5%, gentamicin-72.9%, moxifloxacin-89.5%, ofloxacin-70.8%, oxacillin-58.3%, penicillin-33.3%, tobramycin-85.4%, and vancomycin-100%. CONCLUSION Gram-positive bacteria were the major causes of infectious endophthalmitis in this large series, usually following surgery. CoNS was the most common isolate. Of interest, susceptibility to oxacillin and fourth-generation quinolones was lower than previously published.
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Affiliation(s)
- G B Melo
- Department of Ophthalmology, Federal University of São Paulo, São Paulo, Brazil.
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Regatieri CV, Dreyfuss JL, Melo GB, Lavinsky D, Hossaka SK, Rodrigues EB, Farah ME, Maia M, Nader HB. Quantitative evaluation of experimental choroidal neovascularization by confocal scanning laser ophthalmoscopy: fluorescein angiogram parallels heparan sulfate proteoglycan expression. Braz J Med Biol Res 2010; 43:627-33. [PMID: 20464343 DOI: 10.1590/s0100-879x2010007500043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Accepted: 04/28/2010] [Indexed: 11/22/2022] Open
Abstract
The objective of the present study was to develop a quantitative method to evaluate laser-induced choroidal neovascularization (CNV) in a rat model using Heidelberg Retina Angiograph 2 (HRA2) imaging. The expression of two heparan sulfate proteoglycans (HSPG) related to inflammation and angiogenesis was also investigated. CNV lesions were induced with argon laser in 21 heterozygous Zucker rats and after three weeks a fluorescein angiogram and autofluorescence exams were performed using HRA2. The area and greatest linear dimension were measured by two observers not aware of the protocol. Bland-Altman plots showed agreement between the observers, suggesting that the technique was reproducible. After fluorescein angiogram, HSPG (perlecan and syndecan-4) were analyzed by real-time RT-PCR and immunohistochemistry. There was a significant increase in the expression of perlecan and syndecan-4 (P < 0.0001) in retinas bearing CNV lesions compared to control retinas. The expression of these two HSPG increased with increasing CNV area. Immunohistochemistry demonstrated that the rat retina damaged with laser shots presented increased expression of perlecan and syndecan-4. Moreover, we observed that the overexpression occurred in the outer layer of the retina, which is related to choroidal damage. It was possible to develop a standardized quantitative method to evaluate CNV in a rat model using HRA2. In addition, we presented data indicating that the expression of HSPG parallels the area of CNV lesion. The understanding of these events offers opportunities for studies of new therapeutic interventions targeting these HSPG.
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Affiliation(s)
- C V Regatieri
- Departamento de Oftalmologia, Universidade Federal de São Paulo, SP, Brasil
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Monteiro BG, Serafim RC, Melo GB, Silva MCP, Lizier NF, Maranduba CMC, Smith RL, Kerkis A, Cerruti H, Gomes JAP, Kerkis I. Human immature dental pulp stem cells share key characteristic features with limbal stem cells. Cell Prolif 2009; 42:587-94. [PMID: 19614680 DOI: 10.1111/j.1365-2184.2009.00623.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVES Limbal stem cells (LSC) are self-renewing, highly proliferative cells in vitro, which express a set of specific markers and in vivo have the capacity to reconstruct the entire corneal epithelium in cases of ocular surface injury. Currently, LSC transplantation is a commonly used procedure in patients with either uni- or bilateral total limbal stem cells deficiency (TLSCD). Although LSC transplantation holds great promise for patients, several problems need to be overcome. In order to find an alternative source of cells that can partially substitute LSC in cornea epithelium reconstruction, we aimed at investigating whether human immature dental pulp stem cells (hIDPSC) would present similar key characteristics as LSC and whether they could be used for corneal surface reconstruction in a rabbit TLSCD model. MATERIALS We used hIDPSC, which co-express mesenchymal and embryonic stem cell markers and present the capacity to differentiate into derivative cells of the three germinal layers. TLSCD was induced by chemical burn in one eye of rabbits. After 30 days, the opaque tissue formed was removed by superficial keratectomy. Experimental group received undifferentiated hIDPSC, while control group only received amniotic membrane (AM). Both groups were sacrificed after 3 months. RESULTS AND CONCLUSIONS We have demonstrated, using immunohistochemistry and reverse transcription-polymerase chain reaction, that hIDPSCs express markers in common with LSC, such as ABCG2, integrin beta1, vimentin, p63, connexin 43 and cytokeratins 3/12. They were also capable of reconstructing the eye surface after induction of unilateral TLSCD in rabbits, as shown by morphological and immunohistochemical analysis using human-specific antibodies against limbal and corneal epithelium. Our data suggest that hIDPSCs share similar characteristics with LSC and might be used as a potential alternative source of cells for corneal reconstruction.
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Affiliation(s)
- B G Monteiro
- Genetics Laboratory, Butantan Institute, São Paulo, SP, Brazil
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Melo GB, Höfling-Lima AL, Alvarenga LS, Monteiro J, Pignatari ACC. Pulsed field gel electrophoresis of chromosomal bacterial DNA in the investigation of infectious endophthalmitis. Br J Ophthalmol 2006; 90:916-7. [PMID: 16782952 PMCID: PMC1857141 DOI: 10.1136/bjo.2005.088864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Melo GB, Silva RL, Melo VA, Antoniolli AR, Souza MEJ, Jordani MC, Castro-e-Silva O. Effect of the aqueous extract of Hyptis pectinata on liver mitochondrial respiration. Phytomedicine 2005; 12:359-62. [PMID: 15957370 DOI: 10.1016/j.phymed.2004.02.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Some studies have indicated that mitochondria may be the target organelle of plants. We therefore decided to assess the effects of the aqueous extract of Hyptis pectinata leaves on liver mitochondrial respiratory function in vitro. Eight rat livers were subjected to isolation of mitochondria by differential centrifugation. In an adequate medium, the plant extract was added at different concentrations. The analyzed data were: state 3, state 4 and respiratory control ratio (RCR). H. pectinata extract caused a statistically significant decrease in state 3 (at 0.05, 0.1 and 0.2 mg/mg protein) and RCR (at 0.05, 0.1 and 0.2 mg/mg protein). Respiratory state 4 was not altered by the increasing concentrations. In conclusion, the aqueous extract of H. pectinata leaves may not injure the mitochondrial inner membrane but decreases significantly the oxidative phosphorylation.
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Affiliation(s)
- G B Melo
- Department of Medicine, Universidade Federal de Sergipe, Aracaju, Brazil
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Resende M, Costa CA, Lobão A, Melo GB. [1st cases of leptospirosis diagnosed serologically in Belém (Pará-Brazil)]. An Inst Med Trop (Lisb) 1966; 23:245-7. [PMID: 5986689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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