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Silva MDCC, Souza ILLD, Vasconcelos LHC, Ferreira PB, Araujo LCDC, Sampaio RDS, Tavares JF, da Silva BA, Cavalcante FDA. Essential oil from Lippia microphylla Cham. modulates nitric oxide pathway and calcium influx to exert a tocolytic effect in rat uterus. Nat Prod Res 2019; 35:1046-1051. [PMID: 31163990 DOI: 10.1080/14786419.2019.1614578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The essential oil of Lippia microphylla (LM-OE) presents several pharmacological activities. This work evaluates the tocolytic effect of LM-OE on rats. LM-OE inhibited phasic contractions and relaxed tonic contractions on rat uterus. Considering that nitric oxide (NO) pathway regulates uterine contraction, LM-OE potency was attenuated in the presence of NO synthase (NOS) inhibitor and this reduction was reversed in the presence of a NOS substrate. Similarly, the relaxant potency of LM-OE was reduced in the presence of soluble guanylyl cyclase (sGC) and protein kinase G (PKG) inhibitors. LM-OE also demonstrates a positive modulation of large and small conductance calcium-activated, voltage-gated and adenosine triphosphate-sensitive potassium channels and inhibited curves to CaCl2 as well as relaxed the uterus pre-contracted by S-(-)-Bay K8644, suggesting voltage-gated calcium channels type-1 (CaV1) blockade. Thus, the tocolytic effect of LM-OE on rat involves positive modulation of NO/NOS/sGC/PKG/K+-channels pathway and Ca2+ influx blockade through CaV1.[Formula: see text].
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Affiliation(s)
- Maria da Conceição Correia Silva
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil
| | - Iara Leão Luna de Souza
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil.,Departamento de Fisiologia e Patologia, CCS, UFPB, João Pessoa, PB, Brazil
| | - Luiz Henrique César Vasconcelos
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil.,Departamento de Fisiologia e Patologia, CCS, UFPB, João Pessoa, PB, Brazil
| | - Paula Benvindo Ferreira
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil
| | - Layanne Cabral da Cunha Araujo
- Programa de Pós-graduação em Ciências (Fisiologia Humana), Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Renata de Souza Sampaio
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil
| | - Josean Fechine Tavares
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil.,Departamento de Ciências Farmacêuticas, CCS, UFPB, João Pessoa, PB, Brazil
| | - Bagnólia Araújo da Silva
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil.,Departamento de Ciências Farmacêuticas, CCS, UFPB, João Pessoa, PB, Brazil
| | - Fabiana de Andrade Cavalcante
- Programa de Pós-graduação em Produtos Naturais e Sintéticos Bioativos, Centro de Ciências da Saúde (CCS), Universidade Federal da Paraíba (UFPB), João Pessoa, PB, Brazil.,Departamento de Fisiologia e Patologia, CCS, UFPB, João Pessoa, PB, Brazil
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Feiteiro J, Mariana M, Verde I, Cairrão E. Genomic and Nongenomic Effects of Mifepristone at the Cardiovascular Level: A Review. Reprod Sci 2016; 24:976-988. [DOI: 10.1177/1933719116671002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Joana Feiteiro
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Melissa Mariana
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Ignacio Verde
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Elisa Cairrão
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
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Mariana M, Feiteiro J, Cairrao E, Verde I. Mifepristone is a Vasodilator Due to the Inhibition of Smooth Muscle Cells L-Type Ca2+ Channels. Reprod Sci 2015; 23:723-30. [PMID: 26543162 DOI: 10.1177/1933719115612926] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Derived from the estrane progestins, mifepristone was the first synthetic steroid of this class employed as abortifacient in the first months of pregnancy. Mifepristone reduces high potassium-induced contraction and prevents calcium-induced contraction. At the vascular level, mifepristone induces direct relaxation in rat and human arteries, and this effect seems to be endothelium- and NO independent, suggesting that the vascular smooth muscle is its target. Moreover, mifepristone's effect could involve the modulation of different calcium channels. The aim of the present study is to analyze the involvement of calcium channels in the relaxation induced by mifepristone on vascular smooth muscle cells (VSMCs). Planar cell surface area (PCSA) technique was used to analyze the effect of mifepristone on the VSMC contractility, and the whole cell configuration of patch-clamp technique to measure the activity of L-type Ca(2+) channels (LTCC) in A7r5 cells. Regarding the PCSA technique, mifepristone induced relaxation of the VSMC previously contracted by different agents. Also, a rapid inhibitory effect on basal and BAY K8644-stimulated calcium current was observed, which indicates that this drug has the ability to block LTCC. These results suggest that mifepristone induces relaxation on the VSMCs due to the inhibition of the calcium channels.
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Affiliation(s)
- Melissa Mariana
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Joana Feiteiro
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Elisa Cairrao
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
| | - Ignacio Verde
- Centro de Investigação em Ciências da Saúde, University of Beira Interior, Covilhã, Portugal
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Perusquía M, Espinoza J, Navarrete E. Nongenomic uterine relaxing effect of RU 486 (mifepristone) prior to its antiprogesterone activity in the human pregnancy. Steroids 2009; 74:825-31. [PMID: 19464306 DOI: 10.1016/j.steroids.2009.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2008] [Revised: 04/30/2009] [Accepted: 05/08/2009] [Indexed: 11/24/2022]
Abstract
The antiprogestin mifepristone (RU 486) is used for termination of pregnancy, as RU 486 blocks the quiescent action of progesterone, increases uterine contractility, sensitizes the myometrium to prostaglandins, and elicits cervical ripening. Since RU 486 represents a class of compound that is structurally related to steroid hormones, some of which possess a nongenomic uterine relaxing effect, we investigated the potential nongenomic relaxing action of RU 486 on the human pregnant myometrium. Myometrial tissues were obtained from pregnant women undergoing elective cesarean section at term and were isometrically recorded. RU 486 caused relaxation on spontaneous contractility and high potassium-induced contractions with lower relaxing efficacy than progesterone. The progesterone receptor-blocking activity of RU 486 did not antagonize the uterine relaxation of progesterone. Moreover, contractions induced by oxytocin or different prostaglandins (PGF(2alpha), PGE(2), and a prostaglandin analogue, misoprostol) were inhibited rather than increased by RU 486. RU 486 induced a rapid and reversible relaxing effect, which was unaffected by inhibitors of protein synthesis and transcription, implying that RU 486 acts through a nongenomic mechanism. This study reveals that RU 486: (i) reduced high potassium-induced contraction and prevented calcium-induced contraction in depolarized tissue; and (ii) relaxed the oxytocin- and prostaglandin-induced contractions, indicating a blockade of voltage- and receptor-operated calcium channels by RU 486. These data show that this antiprogestin may induce a rapid nongenomic antiuterotonic effect prior to its antiprogesterone action.
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Affiliation(s)
- Mercedes Perusquía
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Apartado Postal 70228, 04510 México D.F., Mexico.
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Perez-Hernandez N, Ponce-Monter H, Medina JA, Joseph-Nathan P. Spasmolytic effect of constituents from Lepechinia caulescens on rat uterus. JOURNAL OF ETHNOPHARMACOLOGY 2008; 115:30-35. [PMID: 17997242 DOI: 10.1016/j.jep.2007.08.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2007] [Revised: 08/28/2007] [Accepted: 08/29/2007] [Indexed: 05/25/2023]
Abstract
Lepechinia caulescens Ortega Epling (Lamiaceae) is a perennial herb used in Mexican folk medicine to treat diabetes, hypertension, gastrointestinal infections, dysmenorrhea and as abortifacient. In this study, a bioassay-guided fractionation of the hexanes extract of the leaves, evaluating the capacity to relax contraction of rat uterus rings induced by KCl (60mM), was made. The results indicated that, from the four isolated terpenes, spathulenol (1) was the most potent spasmolytic agent, followed by methyl 9alpha,13alpha-epidioxyabiet-8(14)-en-18-oate (2), 9alpha-hydroxydehydroabietyl alcohol (4) and dehydroabietic acid (3) studied at 10 and 30 microg/mL. The spasmolytic activity of 1 was totally reverted by addition of increasing extracellular Ca2+ concentrations ([Ca2+]o), while incubation of uterus rings with 1 in calcium free solutions reduced the contraction produced by [Ca2+]o in a concentration-dependent manner. Moreover, the presence of L-NAME (100 microM) or propranolol (10 microM) did not block the spasmolytic effect. These results suggest that 1 induces a greater blocking action on voltage-operated calcium channels. EtOAc and MeOH extracts of the leaves, which showed slight relaxing activity, led to 4 and rosmarinic acid (5).
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Affiliation(s)
- Nury Perez-Hernandez
- Escuela de Medicina, Universidad Autónoma del Estado de Hidalgo, Eliseo Ramirez Ullua 400, Col. Doctores, Pachuca, Hidalgo 42001, Mexico
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Li Y, Je HD, Malek S, Morgan KG. Role of ERK1/2 in uterine contractility and preterm labor in rats. Am J Physiol Regul Integr Comp Physiol 2004; 287:R328-35. [PMID: 15072963 DOI: 10.1152/ajpregu.00042.2004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The present study tested the hypothesis that ERK activation is an essential step in the onset of labor in a rat model of preterm labor. The administration of RU-486, an antiprogesterone agent, to rats induced preterm delivery 22.2 +/- 0.24 h after treatment. Changes in basal signaling events were studied in myometrial tissue from CO(2)-euthanized rats. Rats treated with RU-486 displayed a dramatically increased in vitro uterine contractility compared with gestational stage-matched, sham-treated rats. In vitro contractility was not significantly different from that during spontaneous labor. During RU-486-induced preterm labor, as previously described for spontaneous labor, ERK phosphorylation levels increased, as did phosphorylation of caldesmon at Ser(789), an ERK phosphorylation site. Also, a small but significant increase in 20-kDa myosin light chain phosphorylation was seen at a constant intracellular pCa of 7. When rats were chronically treated with an agent that prevents ERK activation, U-0126, the onset of RU-486-induced preterm labor was delayed in a statistically significant manner. Chronic in vivo treatment with U-0126 also significantly inhibited the RU-486-induced increase in in vitro contractility and ERK and caldesmon phosphorylation but did not alter the RU-486-induced increase in 20-kDa myosin light chain phosphorylation. These data indicate that ERK activation is a component of the multiple events leading to the development of labor in this rat model. We suggest that the ERK pathway could possibly be used to identify targets for the development of a novel class of tocolytic agents.
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Affiliation(s)
- Yunping Li
- Department of Anesthesia and Critical Care, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston 02215, USA.
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