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Andrade AKDS, de Franca MNF, Santos JF, Macêdo NA, de Lucca Junior W, Scher R, Cavalcanti SCDH, Corrêa CB. Anti-migratory and cytotoxic effect of indole derivative in C6 glioma cells. Toxicol In Vitro 2024; 96:105786. [PMID: 38301920 DOI: 10.1016/j.tiv.2024.105786] [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: 07/26/2023] [Revised: 12/28/2023] [Accepted: 01/25/2024] [Indexed: 02/03/2024]
Abstract
Gliomas are among the most common primary malignant brain tumors. Despite advances in cancer treatment, survival is very low, so the discovery of new therapeutic agents is essential. In this context, indole is an important source for the development of new bioactive molecules. A pharmacological screening of ten indole derivatives was carried out to evaluate the cytotoxic capacity against three tumor cell lines. After pharmacological screening, three compounds were selected, based on their high capacity to reduce cell proliferation, and their IC50 values were determined. Compound 9 exhibited the highest cytotoxic activity (IC50 = 0.4 μg/mL) in gliomas (C6 cell line), and were selected for further experiments. C6 cells were treated with compound 9 to evaluate cellular mechanisms such as colony formation and cell migration capacity and morphological alterations. Compound 9 decreased clone formation (0.4 and 0.8 μg/mL), and inhibited migration (0.2-0.8 μg/mL) in C6 cells. Morphological changes in cells treated with the compound 9 were also observed, such as chromatin condensation, and disorganization in cellular stress beams. Indole derivatives had a cytotoxic effect on tumor cells, and compound 9 showed the best anti-proliferative and anti-migratory activity in glioma cells.
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Affiliation(s)
- Ana Karolina de Souza Andrade
- Physiological Sciences Graduate Program, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil; Morphology Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Mariana Nobre Farias de Franca
- Health Science Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, Brazil; Morphology Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil.
| | - Jileno Ferreira Santos
- Physiological Sciences Graduate Program, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil; Morphology Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | | | | | - Ricardo Scher
- Morphology Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | | | - Cristiane Bani Corrêa
- Physiological Sciences Graduate Program, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil; Health Science Graduate Program, Federal University of Sergipe, Aracaju, Sergipe, Brazil; Morphology Department, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
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Dos Santos EWP, de Sousa RC, de Franca MNF, Santos JF, Ottoni FM, Isidório RG, de Lucca Junior W, Alves RJ, Scher R, Corrêa CB. Inhibitory effect of O-propargyllawsone in A549 lung adenocarcinoma cells. BMC Complement Med Ther 2023; 23:333. [PMID: 37730601 PMCID: PMC10510246 DOI: 10.1186/s12906-023-04156-9] [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: 06/19/2023] [Accepted: 09/06/2023] [Indexed: 09/22/2023] Open
Abstract
BACKGROUND Lung cancer is the deadliest type of cancer in the world and the search for compounds that can treat this disease is highly important. Lawsone (2-hydroxy-1,4-naphtoquinone) is a naphthoquinone found in plants from the Lawsone genus that show a high cytotoxic effect in cancer cell lines and its derivatives show an even higher cytotoxic effect. METHODS Sulforhodamine B was used to evaluate the cytotoxic activity of compounds on tumor cells. Clonogenic assay was used to analyze the reduction of colonies and wound healing assay to the migratory capacity of A549 cells. Apoptosis and necrosis were analyzed by flow cytometer and Giemsa staining. Hemolysis assay to determine toxicity in human erythrocytes. RESULTS Lawsone derivatives were evaluated and compound 1 (O-propargyllawsone) was the one with the highest cytotoxic effect, with IC50 below 2.5 µM in A549 cells. The compound was able to reduce colony formation and inhibit cell migration. Morphological changes and cytometry analysis show that the compound induces apoptosis and necrosis in A549 cells. CONCLUSIONS These results show that O-propargyllawsone show a cytotoxic effect and may induce apoptosis in A549 cells.
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Affiliation(s)
- Edmilson Willian Propheta Dos Santos
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
- Graduate Program in Health Sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - Rauan Cruz de Sousa
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Mariana Nobre Farias de Franca
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
- Graduate Program in Health Sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - Jileno Ferreira Santos
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Flaviano Melo Ottoni
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Raquel Geralda Isidório
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Waldecy de Lucca Junior
- Laboratory of Molecular Neuroscience of Sergipe, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Ricardo José Alves
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Ricardo Scher
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Cristiane Bani Corrêa
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil.
- Graduate Program in Health Sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil.
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Figueiredo CGF, Santos MSD, Santos AS, Silva EDS, Lima B, Lucca Junior WD, Araujo YLFMD, Batista MVDA. In vitro evaluation of the antibacterial effect of Brazilian red propolis ethanol extract in the prevention of periodontal disease in dogs. Comp Immunol Microbiol Infect Dis 2023; 92:101924. [PMID: 36463681 DOI: 10.1016/j.cimid.2022.101924] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 11/17/2022] [Accepted: 11/25/2022] [Indexed: 11/27/2022]
Abstract
Dental plaque (DP) is found on the surface of teeth and comprises a community of microorganisms that form a structured biofilm. Bacteria present in DP are potential periodontal pathogens when there is an imbalance in the healthy oral environment, and are precursors of periodontal disease (PD). In dogs, the treatments, such as mechanical removal, are difficult and expensive to apply. Therefore, in order to seek new therapeutic alternatives to control dental plaque in dogs, Brazilian red propolis ethanol extract (RPEE) was tested to evaluate its antibacterial effect on bacteria isolated from DP of dogs without PD. DP was collected from the supragingival dental surfaces of 10 dogs. Bacterial isolates of DP were identified by PCR and sequencing of 16S rDNA gene. The RPEE was obtained using the ultrasound ethanol extraction technique, and the chemical composition was obtained by HPLC-DAD and UV-spectrophotometry. In total, 29 different bacteria belonging to five genera were identified. Formononetin, biochanin A, liquiritigenin and daidzein were the major constituents of the RPEE. The cytotoxic effect showed cell viability after 24 h above 50 % at all concentrations evaluated. The minimum inhibitory concentration was between 37.5 and 150.0 µg/mL for all bacterial isolates. The minimal bactericidal concentration was between 150 and 1200 µg/mL for Gram-positive and 300-1200 µg/mL for Gram-negative bacteria. The results are promising and suggest that RPEE has significant antibacterial potential against the bacteria present in the DP of healthy dogs. Although further studies are still needed, the results suggest RPEE might be safely used in the prevention of periodontal disease.
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Affiliation(s)
- Chrislayne Gonçalves Farias Figueiredo
- Laboratory of Molecular Genetics and Biotechnology (GMBio), Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Mariel Salvador Dos Santos
- Laboratory of Molecular Genetics and Biotechnology (GMBio), Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Amanda Silva Santos
- Laboratory of Chemistry of Natural and Biochemical Products, Department of Physiology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Elizabete de Santana Silva
- Sergipe Multiuser Molecular Neuroscience Laboratory, Department of Morphology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Bruno Lima
- Laboratory of Pharmaceutical Testing and Toxicity, Department of Pharmacy, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Waldecy de Lucca Junior
- Sergipe Multiuser Molecular Neuroscience Laboratory, Department of Morphology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Yzila Liziane Farias Maia de Araujo
- Laboratory of Molecular Genetics and Biotechnology (GMBio), Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil
| | - Marcus Vinicius de Aragão Batista
- Laboratory of Molecular Genetics and Biotechnology (GMBio), Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil.
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Gomes DS, Negrão-Corrêa DA, Miranda GS, Rodrigues JGM, Guedes TJFL, de Lucca Junior W, Sá Filho JCFD, Nizio DADC, Blank AF, Feitosa VLC, Dolabella SS. Lippia alba and Lippia gracilis essential oils affect the viability and oviposition of Schistosoma mansoni. Acta Trop 2022; 231:106434. [PMID: 35364048 DOI: 10.1016/j.actatropica.2022.106434] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 03/23/2022] [Accepted: 03/28/2022] [Indexed: 12/28/2022]
Abstract
Schistosomiasis is a neglected tropical disease that affects millions of people around the world. Currently, the only drug available for the treatment of this disease is praziquantel, which has low efficacy against immature helminth stages and there are reports of drug resistance. In this study, the chemical composition and the in vitro effect of essential oils (EOs) and major compounds from Lippia gracilis and Lippia alba against schistosomula and adult Schistosoma mansoni worms were evaluated. Adult S. mansoni worms cultured for 8h in the presence of L. gracilis EO (50 and 100 µg/mL) or for 2h with its major compound, carvacrol (100 µg/mL), had a 100% reduction in viability. After interaction with L. alba EO (100µg/mL), there was a reduction of approximately 60% in the viability of adult worms after 24 hours of exposure; citral (50 and 100 µg/mL), its major compound, reduced the viability after 24 hours by more than 75%. Treatment of schistosomula with 100 µg/mL of L. gracilis or L. alba EOs for 6h led to a reduction in parasite viability of 80% and 16% respectively. Both EOs and their major compounds significantly reduced the oviposition of adult worms exposed to a non-lethal concentration (5 µg/mL). In addition, morphological changes such as the destruction of the tegument and disorganization of the reproductive system of male and female worms were visualized. Both EOs showed low cytotoxicity at a concentration of 50 µg/mL. The results encourage further investigation of these plants as a potential source of bioactive compounds against S. mansoni.
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Heimfarth L, Nascimento LDS, Amazonas da Silva MDJ, Lucca Junior WD, Lima ES, Quintans-Junior LJ, Veiga-Junior VFD. Neuroprotective and anti-inflammatory effect of pectolinarigenin, a flavonoid from Amazonian Aegiphila integrifolia (Jacq.), against lipopolysaccharide-induced inflammation in astrocytes via NFκB and MAPK pathways. Food Chem Toxicol 2021; 157:112538. [PMID: 34500010 DOI: 10.1016/j.fct.2021.112538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 07/18/2021] [Revised: 08/21/2021] [Accepted: 09/03/2021] [Indexed: 12/12/2022]
Abstract
Neurodegenerative diseases affect millions of people worldwide. Regardless of the underlying cause, neuroinflammation is the greatest risk factor for developing any of these disorders. Pectolinarigenin (PNG) is an active flavonoid with several biological properties, anti-metastatic and anti-inflammatory activity. This study investigate the biological effects of PNG in macrophage and astrocyte cultures, with focus on elucidating the molecular mechanisms involved in the PNG activity. J774A.1 murine macrophage or cerebral cortex primary astrocytes primary cultures were treated with different concentration of PNG (1-160 μM) and the inflammatory process was stimulated by LPS (1 μg/ml) and the effect of PNG in different inflammatory markers were determined. PNG did not affect astrocyte or macrophage viability. Moreover, this flavonoid reduced NO• release in macrophages, attenuated astrocyte activation by preventing the overexpression of glial fibrillary acidic protein, and decreased the release of inflammatory mediators, IL-1β and IL-6 induced by LPS by the glial cell, as well as enhanced basal levels of IL-10. In addition, PNG suppressed NFκB, p38MAPK and ERK1/2 phosphorylation in astrocytes culture induced by LPS. The results show clear evidence that this novel flavonoid protects astrocytes against LPS-induced inflammatory toxicity. In conclusion, PNG presents neuroprotective and anti-inflammatory property through the inhibition of inflammatory signaling pathways.
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Affiliation(s)
- Luana Heimfarth
- Department of Physiology, Federal University of Sergipe, São Cristóvão, SE, Brazil
| | | | | | | | - Emerson Silva Lima
- Faculty of Pharmaceutical Sciences, Federal University of Amazonas, Manaus, AM, Brazil
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de Franca MNF, Isidório RG, Bonifacio JHO, Dos Santos EWP, Santos JF, Ottoni FM, de Lucca Junior W, Scher R, Alves RJ, Corrêa CB. Anti-proliferative and pro-apoptotic activity of glycosidic derivatives of lawsone in melanoma cancer cell. BMC Cancer 2021; 21:662. [PMID: 34078316 PMCID: PMC8173884 DOI: 10.1186/s12885-021-08404-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 01/31/2021] [Accepted: 05/24/2021] [Indexed: 01/16/2023] Open
Abstract
Background Melanoma is a malignant cancer that affects melanocytes and is considered the most aggressive skin-type cancer. The prevalence for melanoma cancer for the last five year is about one million cases. The impact caused of this and other types of cancer, revel the importance of research into potential active compounds. The natural products are an important source of compounds with biological activity and research with natural products may enable the discovery of compounds with potential activity in tumor cells. Methods The Sulforhodamine B was used to determine cell density after treatment with lawsone derivatives. Apoptosis and necrosis were analyzed by flow cytometer. Morphological changes were observed by fluorescence using the Phalloidin/FITC and DAPI stains. The clonogenic and wound healing assays were used to analyze reduction of colonies formation and migratory capacity of melanoma cells, respectability. Results In pharmacological screening, seven compounds derived from lawsone were considered to have high cytotoxic activity (GI > 75%). Three compounds were selected to assess the inhibitory concentration for 50% of cells (IC50), and the compound 9, that has IC50 5.3 μM in melanoma cells, was selected for further analyses in this cell line. The clonogenic assay showed that the compound is capable of reducing the formation of melanoma colonies at 10.6 μM concentration. The compound induced apoptotic morphological changes in melanoma cells and increased by 50% the cells dying from apoptosis. Also, this compound reduced the migratory capacity of melanoma cells. Conclusions The results of this study showed that the evaluated lawsone derivatives have potential activity on tumor cells. The compound 9 is capable of inducing cell death by apoptosis in melanoma cells (B16F10). Supplementary Information The online version contains supplementary material available at 10.1186/s12885-021-08404-4.
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Affiliation(s)
- Mariana Nobre Farias de Franca
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil.,Graduate program in health sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - Raquel Geralda Isidório
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - João Henrique Oliveira Bonifacio
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil
| | - Edmilson Willian Propheta Dos Santos
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil.,Graduate program in health sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil
| | - Jileno Ferreira Santos
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil
| | - Flaviano Melo Ottoni
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Waldecy de Lucca Junior
- Laboratory of Molecular Neuroscience of Sergipe, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
| | - Ricardo Scher
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil
| | - Ricardo José Alves
- Laboratory of Pharmaceutical Chemistry, Department of Pharmaceutical Products, Faculty of Pharmacy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Cristiane Bani Corrêa
- Laboratory of Biology and Immunology of Cancer and Leishmania, Department of Morphology, Federal University of Sergipe, São Cristóvão, Sergipe, Brasil. .,Graduate program in health sciences, Federal University of Sergipe, Aracaju, Sergipe, Brazil.
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Carvalho FO, Silva ÉR, Nunes PS, Felipe FA, Ramos KPP, Ferreira LAS, Lima VNB, Shanmugam S, Oliveira AS, Guterres SS, Camargo EA, Cravalho Olivera TV, de Albuquerque Júnior RLC, de Lucca Junior W, Quintans-Júnior LJ, Araújo AAS. Effects of the solid lipid nanoparticle of carvacrol on rodents with lung injury from smoke inhalation. Naunyn Schmiedebergs Arch Pharmacol 2019; 393:445-455. [PMID: 31655855 DOI: 10.1007/s00210-019-01731-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 05/03/2019] [Accepted: 09/10/2019] [Indexed: 01/13/2023]
Abstract
The aim of this present study was to evaluate the effect of solid lipid nanoparticles (SLN) containing carvacrol over the lung damage of airway smoke inhalation. The study was conducted with 30 rats subjected to smoke inhalation and divided into 5 groups such as, normal control, negative control, oxygen group, SLN alone, and SLN+CARV group. The animals were sacrificed 24 h after the induction of inhalation injury further, the tissues of larynx, trachea, and lungs were collected for the histological, hematological, myeloperoxidase, and malondialdehyde analysis. The obtained results showed that treatment with CARV+SLN minimized the inhalation injury, since it reduced malondialdehyde significantly, when compared to the negative control group and minimized the histological changes which proves the absence of pulmonary emphysema and exudate in laryngeal and tracheal lumen in the CARV+SLN-treated group. Meanwhile, the presence of lesion with chronic characteristics was observed in the negative control and oxygen groups. It is suggested that the SLN containing carvacrol minimized oxidative stress and histological damages generated from smoke inhalation in rodents.
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Affiliation(s)
- Fernanda O Carvalho
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Érika R Silva
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Paula S Nunes
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil.
| | - Fernanda A Felipe
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Karen P P Ramos
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Luiz Augusto S Ferreira
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Viviane N B Lima
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Saravanan Shanmugam
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil.
| | - Alan Santos Oliveira
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Sílvia S Guterres
- Post-Graduation Program in Pharmaceutical Sciences, Federal University of Rio Grande do Sul, Ipiranga Avenue 2752, Porto Alegre, RS, 90610-000, Brazil
| | - Enilton A Camargo
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | | | | | - Waldecy de Lucca Junior
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Lucindo José Quintans-Júnior
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
| | - Adriano A S Araújo
- Health Sciences Post-Graduate Program, Federal University of Sergipe, Claudio Batista St s/n, Aracaju, SE, 49060-100, Brazil
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de Lucca Junior W, Franci CR. Angiotensinergic pathway through the median preoptic nucleus in the control of oxytocin secretion and water and sodium intake. Brain Res 2004; 1014:236-43. [PMID: 15213008 DOI: 10.1016/j.brainres.2004.03.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/31/2004] [Indexed: 11/27/2022]
Abstract
Our objective was to study in which situations the median preoptic nucleus (MnPO) interferes with the control of oxytocin secretion and salt intake and the possible mediation of angiotensin II (AII) through their AT1 receptors. Lesion of the MnPO by ibotenic acid in male rats did not change water and NaCl intake in conditions of ad libitum offer, water deprivation or salt load, but it did cause significant decrease of NaCl intake in sodium depleted animals. These animals presented higher water intake or lower NaCl intake after microinjection of AII or losartan into the MnPO, respectively. They decreased plasma oxytocin after microinjection of losartan into the MnPO, but not of AII or isotonic saline. Oxytocin secretion induced by hypertonic saline i.p. was reduced by microinjection of AII, but not losartan into the MnPO. On the other hand, microinjection of losartan in this area, but not AII, reduced plasma oxytocin in animals submitted to the isotonic saline i.p. Thus, it seems that the sodium intake control is performed by MnPO neurons through the stimulatory action of angiotensin II on AT1 receptors under sodium depletion, but not water deprivation or salt overload neither of ad libitum water and salt intake condition. On the other hand, in the high-sodium condition, endogenous angiotensin did not act on MnPO neurons to the control of oxytocin secretion while exogenous angiotensin inhibited oxytocin secretion. These results indicate two possible angiotensinergic neural circuits: one is stimulating and the other is inhibiting oxytocin secretion, depending on sodium balance.
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Affiliation(s)
- Waldecy de Lucca Junior
- Departamento de Fisiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Avenida bandeirantes, 3900. CEP: 14049-900 Ribeirão Preto-SP, Brazil
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