Cardiovascular protection of magnolol: cell-type specificity and dose-related effects

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Abstract

Magnolia officinalis has been widely used in traditional Chinese medicine. Magnolol, an active component isolated from Magnolia officinalis, is known to be a cardiovascular protector since 1994. The multiplex mechanisms of magnolol on cardiovascular protection depends on cell types and dosages, and will be reviewed and discussed in this article. Magnolol under low and moderate dosage possesses the ability to protect heart from ischemic/reperfusion injury, reduces atherosclerotic change, protects endothelial cell against apoptosis and inhibits neutrophil-endothelial adhesion. The moderate to high concentration of magnolol mainly acts on smooth muscle cells and platelets. Magnolol induces apoptosis in vascular smooth muscle cells at moderate concentration and inhibits proliferation at moderate and high concentration. High concentration of magnolol also abrogates platelet activation, aggregation and thrombus formation. Magnolol also serves as an smooth muscle relaxant only upon the high concentration. Oral intake of magnolol to reach the therapeutic level for cardiovascular protection is applicable, thus makes magnolol an agent of great potential for preventing cardiovascular diseases in high-risk patients.

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Inflammation in atherosclerosis: from pathophysiology to practice.

Peter Libby, Paul M Ridker, Göran K Hansson (2009)

Until recently, most envisaged atherosclerosis as a bland arterial collection of cholesterol, complicated by smooth muscle cell accumulation. According to that concept, endothelial denuding injury led to platelet aggregation and release of platelet factors which would trigger the proliferation of smooth muscle cells in the arterial intima. These cells would then elaborate an extracellular matrix that would entrap lipoproteins, forming the nidus of the atherosclerotic plaque. Beyond the vascular smooth muscle cells long recognized in atherosclerotic lesions, subsequent investigations identified immune cells and mediators at work in atheromata, implicating inflammation in this disease. Multiple independent pathways of evidence now pinpoint inflammation as a key regulatory process that links multiple risk factors for atherosclerosis and its complications with altered arterial biology. Knowledge has burgeoned regarding the operation of both innate and adaptive arms of immunity in atherogenesis, their interplay, and the balance of stimulatory and inhibitory pathways that regulate their participation in atheroma formation and complication. This revolution in our thinking about the pathophysiology of atherosclerosis has now begun to provide clinical insight and practical tools that may aid patient management. This review provides an update of the role of inflammation in atherogenesis and highlights how translation of these advances in basic science promises to change clinical practice.

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Honokiol, a multifunctional antiangiogenic and antitumor agent.

Jack Arbiser, Jacquelyn L. Fried (2009)

Honokiol is a small-molecule polyphenol isolated from the genus Magnolia. It is accompanied by other related polyphenols, including magnolol, with which it shares certain biologic properties. Recently, honokiol has been found to have antiangiogenic, antiinflammatory, and antitumor properties in preclinical models, without appreciable toxicity. These findings have increased interest in bringing honokiol to the clinic as a novel chemotherapeutic agent. In addition, mechanistic studies have tried to find the mechanism(s) of action of honokiol, for two major reasons. First, knowledge of the mechanisms of action may assist development of novel synthetic analogues. Second, mechanistic actions of honokiol may lead to rational combinations with conventional chemotherapy or radiation for enhanced response to systemic cancers. In this review, we describe the findings that honokiol has two major mechanisms of action. First, it blocks signaling in tumors with defective p53 function and activated ras by directly blocking the activation of phospholipase D by activated ras. Second, honokiol induces cyclophilin D, thus potentiating the mitochondrial permeability transition pore, and causing death in cells with wild-type p53. Knowledge of the dual activities of honokiol can assist with the development of honokiol derivatives and the design of clinical trials that will maximize the potential benefit of honokiol in the patient setting.

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Complex Regulation and Function of the Inflammatory Smooth Muscle Cell Phenotype in Atherosclerosis

Anthony Orr, Nicole Hastings, Brett Blackman … (2010)

Vascular smooth muscle cell (SMC) phenotypic modulation plays a key role in atherosclerosis and is classically defined as a switch from a ‘contractile’ phenotype to a ‘synthetic’ phenotype, whereby genes that define the contractile SMC phenotype are suppressed and proliferation and/or migratory mechanisms are induced. There is also evidence that SMCs may take on a ‘proinflammatory’ phenotype, whereby SMCs secrete cytokines and express cell adhesion molecules, e.g. IL-8, IL-6, and VCAM-1, respectively, which may functionally regulate monocyte and macrophage adhesion and other processes during atherosclerosis. Factors that drive the inflammatory phenotype are not limited to cytokines but also include hemodynamic forces imposed on the blood vessel wall and intimate interaction of endothelial cells with SMCs, as well as changes in matrix composition in the vessel wall. However, it is critical to recognize that our understanding of the complex interaction of these multiple signal inputs has only recently begun to shed light on mechanisms that regulate the inflammatory SMC phenotype, primarily through models that attempt to recreate this environment ex vivo. The goal of this review is to summarize our current knowledge in this area and identify some of the key unresolved challenges and questions requiring further study.

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Author and article information

Journal

Journal ID (nlm-ta): J Biomed Sci

Journal ID (iso-abbrev): J. Biomed. Sci

Title: Journal of Biomedical Science

Publisher: BioMed Central

ISSN (Print): 1021-7770

ISSN (Electronic): 1423-0127

Publication date Collection: 2012

Publication date (Electronic): 31 July 2012

Volume: 19

Issue: 1

Page: 70

Affiliations

[1 ]Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan

[2 ]Center for Stem Cell Research, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan

[3 ]Institute of Engineering in Medicine, University of California, San Diego, La Jolla, CA, USA

[4 ]Department of Medicine, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan

[5 ]Department of Medicine, Wan Fang Hospital, Taipei Medical University, 111, Sec 3, Hsing-Long Rd, Taipei, 116, Taiwan

Article

Publisher ID: 1423-0127-19-70

DOI: 10.1186/1423-0127-19-70

PMC ID: 3418199

PubMed ID: 22849814

SO-VID: 539cbf25-4259-4d11-8033-1fd56ca29916

License:

This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Cardiovascular protection of magnolol: cell-type specificity and dose-related effects

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Network and Systems Medicine

Most cited references 61

Inflammation in atherosclerosis: from pathophysiology to practice.

Honokiol, a multifunctional antiangiogenic and antitumor agent.

Complex Regulation and Function of the Inflammatory Smooth Muscle Cell Phenotype in Atherosclerosis

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