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Sibjotang Increases Atrial Natriuretic Peptide Secretion in Beating Rabbit Atria. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:268643. [PMID: 26495007 PMCID: PMC4606132 DOI: 10.1155/2015/268643] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/13/2015] [Indexed: 11/18/2022]
Abstract
Sibjotang (Shizaotang), traditional herbal medicine formula, which was first documented in the Shanghanlun, has long been prescribed for the treatment of impairment of the body fluid homeostasis. The purpose of the present study was to identify the effects of Sibjotang on the secretion of a cardiac hormone, atrial natriuretic peptide (ANP), one of the main hormones involved in the regulation of the body fluid and blood pressure homeostasis. Water extract of Sibjotang increased ANP secretion concomitantly with an increase in atrial dynamics in a concentration-dependent manner. Sibjotang-induced increase in ANP secretion and positive inotropic effect were attenuated by GO6976 and LY333531, selective inhibitors of conventional protein kinase C, but not Rottlerin, an inhibitor of novel PKCδ. Similarly to the effect of Sibjotang, extracts of components of Sibjotang, Euphorbia kansui, and Daphne genkwa, but not Euphorbia pekinensis and Ziziphus jujuba, increased ANP secretion and atrial dynamics. Ingredients of Sibjotang, apigenin, rosmarinic acid, and salvianolic acid B decreased ANP secretion and atrial dynamics. These findings suggest that Sibjotang increases ANP secretion and atrial dynamics via activation of conventional protein kinase C signaling. This finding provides experimental evidence for the rationale in the use of Sibjotang in the treatment of impairment of the regulation of body fluid and blood pressure homeostasis.
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Castro AJG, Frederico MJS, Cazarolli LH, Mendes CP, Bretanha LC, Schmidt ÉC, Bouzon ZL, de Medeiros Pinto VA, da Fonte Ramos C, Pizzolatti MG, Silva FRMB. The mechanism of action of ursolic acid as insulin secretagogue and insulinomimetic is mediated by cross-talk between calcium and kinases to regulate glucose balance. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1850:51-61. [PMID: 25312987 DOI: 10.1016/j.bbagen.2014.10.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 09/23/2014] [Accepted: 10/03/2014] [Indexed: 12/29/2022]
Abstract
BACKGROUND The effect of in vivo treatment with ursolic acid (UA) on glycemia in hyperglycemic rats and its mechanism of action on muscle were studied. METHODS The UA effects on glycemia, glycogen, LDH, calcium and on insulin levels were evaluated after glucose tolerance curve. The β-cells were evaluated through the transmission electron microscopy. UA mechanism of action was studied on muscles through the glucose uptake with/without specific insulin signaling inhibitors. The nuclear effect of UA and the GLUT4 expression on muscle were studied using thymidine, GLUT4 immunocontent, immunofluorescence and RT-PCR. RESULTS UA presented a potent antihyperglycemic effect, increased insulin vesicle translocation, insulin secretion and augmented glycogen content. Also, UA stimulates the glucose uptake through the involvement of the classical insulin signaling related to the GLUT4 translocation to the plasma membrane as well as the GLUT4 synthesis. These were characterized by increasing the GLUT4 mRNA expression, the activation of DNA transcription, the expression of GLUT4 and its presence at plasma membrane. Also, the modulation of calcium, phospholipase C, protein kinase C and PKCaM II is mandatory for the full stimulatory effect of UA on glucose uptake. UA did not change the serum LDH and serum calcium balance. CONCLUSIONS The antihyperglycemic role of UA is mediated through insulin secretion and insulinomimetic effect on glucose uptake, synthesis and translocation of GLUT4 by a mechanism of cross-talk between calcium and protein kinases. GENERAL SIGNIFICANCE UA is a potential anti-diabetic agent with pharmacological properties for insulin resistance and diabetes therapy.
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Affiliation(s)
- Allisson Jhonatan Gomes Castro
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Marisa Jádna Silva Frederico
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Luisa Helena Cazarolli
- Universidade Federal da Fronteira Sul, Campus Universitário Laranjeiras do Sul, Laranjeiras do Sul, PR, Brazil
| | - Camila Pires Mendes
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Lizandra Czermainski Bretanha
- Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Éder Carlos Schmidt
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Zenilda Laurita Bouzon
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | | | | | - Moacir Geraldo Pizzolatti
- Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
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Cui HZ, Oh HC, Li X, Lee YJ, Cho KW, Kang DG, Lee HS. Ethanol extract of Lycopus lucidus elicits positive inotropic effect via activation of Ca2+ entry and Ca2+ release in beating rabbit atria. J Med Food 2014; 16:633-40. [PMID: 23875903 DOI: 10.1089/jmf.2012.2487] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Lycopus lucidus Turcz has been widely used as a traditional Oriental medicine (TOM) in Korea and China and prescribed for the enhancement of heart function. However, the precise effects have yet to be defined. The purpose of the present study was, therefore, to address whether the ethanol extract of Lycopus lucidus Turcz (ELT) has a positive inotropic effect. ELT-induced changes in atrial mechanical dynamics (pulse pressure, dp/dt, and stroke volume), and cAMP efflux were measured in perfused beating rabbit atria. Three active components, rosmarinic acid, betulinic acid, and oleanolic acid were identified in ELT by high performance liquid chromatography analysis. ELT increased atrial dynamics in a concentration-dependent manner without changes in atrial cAMP levels and cAMP efflux. The ELT-induced positive inotropic effect was blocked by inhibition of the L-type Ca(2+) channels and sarcoplasmic reticulum (SR). Inhibitors of β-adrenoceptors had no effect on the ELT-induced positive inotropic effect. The results suggest that ELT exerts a positive inotropic effect via activation of Ca(2+) entry through L-type Ca(2+) channel and Ca(2+) release from the SR in beating rabbit atria.
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Affiliation(s)
- Hao Zhen Cui
- Professional Graduate School of Oriental Medicine and College of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk, Korea
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Yang Y, Li C, Xiang X, Dai Z, Chang J, Zhang M, Cai H, Zhang H, Zhang M, Guo Y, Wu Z. Ursolic acid prevents endoplasmic reticulum stress-mediated apoptosis induced by heat stress in mouse cardiac myocytes. J Mol Cell Cardiol 2014; 67:103-11. [PMID: 24389342 DOI: 10.1016/j.yjmcc.2013.12.018] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 12/05/2013] [Accepted: 12/23/2013] [Indexed: 01/15/2023]
Abstract
Heat stress causes serious physiological dysfunction of cardiac myocytes and is associated with several types of cardiovascular diseases. However, the underlying mechanisms and therapeutic strategies to alleviate heat stress-induced myocardial damage are not available. The objective of this study was to (1) investigate the functional role of endoplasmic reticulum (ER) stress-mediated apoptosis in heat exposure-induced myocardial damage, and (2) to evaluate the effects of ursolic acid on the myocardial apoptosis as well as the underlying mechanisms in mouse cardiac myocytes. We show here that heat stress-induced apoptosis is predominantly mediated by the activation of PERK-eIF2α-CHOP unfolded protein response which up-regulates the protein expression of Puma, and by the modulation of cellular redox state. Intriguingly, the myocardial apoptosis is markedly attenuated by ursolic acid treatment. Mechanistically, the protective effects of ursolic acid are mediated, at least partly, by reestablishing the intracellular redox state and inducing the expression of the anti-apoptotic protein Mcl-1, which, in turn, inactivating CHOP-induced Puma up-regulation. The striking finding that ursolic acid has both anti-apoptotic and antioxidative activities against ER stress-associated myocardial damage suggests that supplementation of ursolic acid might be a potential strategy to reduce the detrimental effects of heat stress in cardiomyocytes.
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Affiliation(s)
- Ying Yang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Changwu Li
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Xi Xiang
- State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, PR China
| | - Zhaolai Dai
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Jianyu Chang
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, PR China
| | - Ming Zhang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Hong Cai
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Hua Zhang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China
| | - Meijia Zhang
- State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, 100193, PR China
| | - Yuming Guo
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China.
| | - Zhenlong Wu
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, PR China.
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Kim HY, Choi HR, Lee YJ, Cui HZ, Jin SN, Cho KW, Kang DG, Lee HS. Accentuation of ursolic acid on muscarinic receptor-induced ANP secretion in beating rabbit atria. Life Sci 2014; 94:145-50. [PMID: 24334003 DOI: 10.1016/j.lfs.2013.12.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 11/05/2013] [Accepted: 12/01/2013] [Indexed: 01/11/2023]
Abstract
AIMS Ursolic acid has recently been reported to increase both atrial natriuretic peptide (ANP) secretion and mechanical dynamics in rabbit atria. MAIN METHODS The present study was designed to clarify the regulatory effects of ursolic acid on the β-adrenergic or muscarinic receptor-mediated changes in ANP secretory and contractile function allowing measurement of atrial dynamics such as pulse pressure, stroke volume, and cAMP efflux in isolated perfused beating rabbit atria. KEY FINDINGS Pretreatment with ursolic acid significantly attenuated the isoproterenol (β-adrenergic agonist)-induced decrease in ANP secretion and increases in cAMP levels and atrial dynamics. Interestingly, ursolic acid concentration-dependently accentuated the acetylcholine-induced increase in ANP secretion and decrease in pulse pressure in the presence of isoproterenol (p<0.001). These findings indicate that acetylcholine-induced increase in ANP secretion is potentiated by ursolic acid; furthermore, acetylcholine-induced decrease in atrial dynamics is also potentiated by ursolic acid, suggesting that ursolic acid regulates muscarinic receptor-mediated secretory and contractile responses in perfused beating rabbit atria. SIGNIFICANCE This implicates for the beneficial effects of ursolic acid in the regulation of cardiovascular and body fluid homeostasis.
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Affiliation(s)
- Hye Yoom Kim
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea
| | - Hye Ran Choi
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea
| | - Yun Jung Lee
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea
| | - Hao Zhen Cui
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea; Department of Chinese Medicine, Yanbian University, Yanji, China
| | - Song Nan Jin
- Institute of Materia Medica, Taishan Medical University, Taian, Shandong 271016, China
| | - Kyung Woo Cho
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea
| | - Dae Gill Kang
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea.
| | - Ho Sub Lee
- Hanbang Body-fluid Research Center & Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk 570-749, Republic of Korea.
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Kim HY, Cho KW, Kang DG, Lee HS. Oleanolic acid increases plasma ANP levels via an accentuation of cardiac ANP synthesis and secretion in rats. Eur J Pharmacol 2013; 710:73-9. [DOI: 10.1016/j.ejphar.2013.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 03/29/2013] [Accepted: 04/03/2013] [Indexed: 10/26/2022]
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