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Sunday, 1 December 2013

Angina pectoris - The Phytochemicals

Angina pectoris, also known as Angina, a symptoms of  Ischemic heart disease, is defined as a condition of chest pain caused by poor blood flow through the blood vessels due to obstruction or spasm of the coronary arteries resulting of lack of blood that lead to lack of oxygen supply and waste removal. 
Preventions
Phytochemicals to prevent angina
1. 1. Omega-3 Fatty Acids
a. Systolic blood pressure, triglycerides and LDL cholesterol
In the ccomparison of the cardiovascular risk-reduction potential of three major polyunsaturated fatty acids in a double-blind study. showed that for the diet supplemented with EPA plus DHA compared with the linoleic acid diet systolic blood pressure fell 5.1 mm Hg (p = 0.01); plasma triglyceride and VLDL cholesterol fell by 39% (p = 0.001) and 49% (p = 0.01), respectively; and LDL cholesterol rose by 9% (p = 0.01). There were no significant changes with the diet supplemented with alpha-linolenic acid. The net effect on cardiovascular risk therefore is complex and the systolic blood pressure reduction was substantial, according to "n-3 fatty acids of marine origin lower systolic blood pressure and triglycerides but raise LDL cholesterol compared with n-3 and n-6 fatty acids from plants" by Kestin M, Clifton P, Belling GB, Nestel PJ.(34)

b. Cardiovascular effects
In the comparison of the effects of alpha-linolenic acid (ALA, C18:3n-3) to those of eicosapentaenoic acid (EPA, C20:5n-3) plus docosahexaenoic acid (DHA, C22:6n-3) on cardiovascular risk markers in healthy elderly subjects, found that Both n-3 fatty acid diets did not change concentrations of total-cholesterol, LDL-cholesterol, HDL-cholesterol, triacylglycerol and apoA-1 when compared with the oleic acid-rich diet. However, after the EPA/DHA-rich diet, LDL-cholesterol increased by 0.39 mmol/l (P = 0.0323, 95% CI (0.030, 0.780 mmol/l)) when compared with the ALA-rich diet. Intake of EPA/DHA also increased apoB concentrations by 14 mg/dl (P = 0.0031, 95% CI (4, 23 mg/dl)) and 12 mg/dl (P = 0.005, 95% CI (3, 21 mg/dl)) versus the oleic acid and ALA-rich diet, respectively. Except for an EPA/DHA-induced increase in tissue factor pathway inhibitor (TFPI) of 14.6% (P = 0.0184 versus ALA diet, 95% CI (1.5, 18.3%)), changes in markers of hemostasis and endothelial integrity did not reach statistical significance following consumption of the two n-3 fatty acid diets, according to "Effects of alpha-linolenic acid versus those of EPA/DHA on cardiovascular risk markers in healthy elderly subjects" by Goyens PL, Mensink RP.(35)
c. Obesity
in the determination of whether obesity modifies the association between plasma phospholipid polyunsaturated fatty acids (PUFAs) and markers of inflammation and endothelial activation in Multi-Ethnic Study of Atherosclerosis (MESA) participants, found that the modifying effect of obesity on the association of plasma PUFAs with IL-6 and sICAM-1 suggests differences in fatty acid metabolism and may also have implications in dietary fatty acid intake for obese individuals, particularly for linoleic and EPAs. Further study is warranted to confirm and explain the strong associations of dihomo-γ-linolenic acid (DGLA) with inflammatory and endothelial activation markers, according to "Obesity modifies the association between plasma phospholipid polyunsaturated fatty acids and markers of inflammation: the Multi-Ethnic Study of Atherosclerosis" by Steffen BT, Steffen LM, Tracy R, Siscovick D, Hanson NQ, Nettleton J, Tsai MY.(36)
3. Catechin
Catechin is phytochemical of Flavan-3-ols, in the group of Flavonoids (polyphenols), found abundantly in white tea, green tea, black tea, grapes, wine, apple juice, cocoa, lentils, etc.
a.  Body-weight regulation
Green tea has been proposed as a tool for obesity management as strategies for weight loss and weight maintenance, as researchers found that a green tea-caffeine mixture improves weight maintenance, through thermogenesis, fat oxidation, and sparing fat free mass. The sympathetic nervous system is involved in the regulation of lipolysis, and the sympathetic innervation of white adipose tissue may play an important role in the regulation of total body fat in general, according to "Green tea catechins, caffeine and body-weight regulation" by Westerterp-Plantenga MS.(37)

b. Antioxidant activity
In the research on polyphenolic compounds (included catechins) in the berries of edible honeysuckle and their biological effects, including recommended utilization, are reviewed found that These berries seem to be prospective sources of health-supporting phytochemicals that exhibit beneficial anti-adherence and chemo-protective activities, thus they may provide protection against a number of chronic conditions, e.g., cancer, diabetes mellitus, tumour growth or cardiovascular and neurodegenerative diseases, according to "Phenolic profile of edible honeysuckle berries (genus lonicera) and their biological effects" by Jurikova T, Rop O, Mlcek J, Sochor J, Balla S, Szekeres L, Hegedusova A, Hubalek J, Adam V, Kizek R.(38)

c. Cholesterol and glucose levels
In the examination of the effect of the main green tea catechin, epigallocatechin gallate (EGCG), taken in a green tea extract, Polyphenon E (PPE) and their effect on circulating hormone levels, an established breast cancer risk factor, found that Glucose and insulin levels decreased nonsignificantly in the PPE groups but increased in the placebo group; statistically significant differences in changes in glucose (P=0.008) and insulin (P=0.01) were found. In summary, green tea (400 and 800 mg EGCG as PPE; ~5-10 cups) supplementation for 2 months had suggestive beneficial effects on LDL cholesterol concentrations and glucose-related markers, according to "Effect of 2-month controlled green tea intervention on lipoprotein cholesterol, glucose, and hormonal levels in healthy postmenopausal women" by Wu AH, Spicer D, Stanczyk FZ, Tseng C, Yang CS, Pike MC.(39)
3. Theaflavin with reddish in color, is a phytochemical of Flavan-3-ols, in the group of Flavonoids (polyphenols), formed in tea leaves during fermentation.
a. Cholesterol
In the investigation of 240 men and women 18 years or older on a low-fat diet with mild to moderate hypercholesterolemia were randomly assigned to receive a daily capsule containing theaflavin-enriched green tea extract (375 mg) or placebo for 12 weeks, found that after 12 weeks, the mean ± SEM changes from baseline in total cholesterol, LDL-C, HDL-C, and triglyceride levels were -11.3% ± 0.9% (P = .01), -16.4% ± 1.1% (P = .01), 2.3% ± 2.1% (P = .27), and 2.6% ± 3.5% (P = .47), respectively, in the tea extract group. The mean levels of total cholesterol, LDL-C, HDL-C, and triglycerides did not change significantly in the placebo group. No significant adverse events were observed, according to "Cholesterol-Lowering Effect of a Theaflavin-Enriched Green Tea Extract" by David J. Maron, MD; Guo Ping Lu, MD; Nai Sheng Cai, MD; Zong Gui Wu, MD; Yue Hua Li, MD; Hui Chen, MD; Jian Qiu Zhu, MD; Xue Juan Jin, MS; Bert C. Wouters, MA; Jian Zhao, PhD.(40)

b. Antioxidant effects
In the investigation of four main TF derivatives (theaflavin (TF(1)), theaflavin-3-gallate (TF(2)A), theaflavin-3'-gallate (TF(2)B), and theaflavin-3,3'-digallate (TF(3))) in scavenging reactive oxygen species (ROS) in vitro, their properties of inhibiting superoxide, singlet oxygen, hydrogen peroxide, and the hydroxyl radical, and their effects on hydroxyl radical-induced DNA oxidative damage, found that compared with (-)-epigallocatechin gallate (EGCG), TF derivatives were good antioxidants for scavenging ROS and preventing the hydroxyl radical-induced DNA damage in vitro. TF(3) was the most positive in scavenging hydrogen peroxide and hydroxyl radical, and TF(1) suppressed superoxide. Positive antioxidant capacities of TF(2)B on singlet oxygen, hydrogen peroxide, hydroxyl radical, and the hydroxyl radical-induced DNA damage in vitro were found, according to "Evaluation of the antioxidant effects of four main theaflavin derivatives through chemiluminescence and DNA damage analyses" by Wu YY, Li W, Xu Y, Jin EH, Tu YY.(41)

c. Cardio-protective activities
In the analyzing the protective effect of theaflavin (TF1) and its underlying mechanism,
found that (1) compared with the control group, TF1 (10, 20, 40 μmol/l) displayed a better recovery of cardiac function after ischemia/reperfusion in a concentration-dependent manner. At 60 min of reperfusion, LVDP, ± LVdP/dt (max) and CF in the TF1 group were much higher than those in the control group, whereas left ventricular end-diastolic pressure (LVEDP) in the TF1 group was lower than that in the control group (P < 0.01). (2) Pretreatment with glibenclamide (10 μmol/l), a K(ATP) antagonist, completely abolished the cardioprotective effects of TF1 (20 μmol/l). Also, most of the effects of TF1 (20 μmol/l) on cardiac function after 60 min of reperfusion were reversed by 5-HD (100 μmol/l), a selective mitochondria K(ATP) antagonist. (3) Atractyloside (20 μmol/l), a mitochondrial permeability transition pore (mPTP) opener, administered at the beginning of 15 min of reperfusion completely abolished the cardioprotection of TF1 (20 μmol/l), according to "ATP-dependent potassium channels and mitochondrial permeability transition pores play roles in the cardioprotection of theaflavin in young rat" by Ma H, Huang X, Li Q, Guan Y, Yuan F, Zhang Y.(42)

4. Resveratrol is a type of natural phenol in the group of Stilbenoids, produced naturally by many plants when under attack by bacteria or fungi. It has been studied by many researchers for it health benefits in treating chronic diaereses, including cancer, diabetes, heart disease, etc.
a. In a study of "Resveratrol: a promising agent in promoting cardioprotection against coronary heart disease." by Penumathsa SV, Maulik N. (Source from Molecular Cardiology and Angiogenesis Laboratory, Department of Surgery, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-1110, USA.), posted in PubMed, researchers indicated in abstract that many studies have provided evidence that resveratrol possesses antioxidant and antiapoptotic effects apart from activation of longevity proteins (such as SIRT-1). We have recently reported the angiogenic, antihypercholesterolemic, and antihypercholesterolemic, antihypercholesterolemic, antidiabetic effects of resveratrol and the mechanisms involved in reduced ventricular remodeling and increased cardiac functions. We have also shown different strategic target molecules involved in resveratrol-mediated.
cardioprotection.

b. Lipid metabolism
in a study of " [Effects of resveratrol on lipid metabolism in C57BL/6J mice]."[Article in Chinese]
by Ren Y, Li Y, Zhao Y, Yu F, Zhan Z, Yuan Y, Yang J. (Source from Department of Nutrition and Food hygiene, School of Public Health, China Medical University, Shenyang 110001, China. renyahao0512@sohu.com) researchers found that The serum TC, LDL-C, HDL-C levels of high-fat diet and resveratrol groups were higher than those of control group (P < 0.05), and the serum TC and LDL-C levels of high-fat diet were also higher than those of resveratrol group (P < 0. 05). But the serum TG levels of high-fat diet and resveratrol groups were lower than those of control group (P < 0.05). The TC content of liver in high-fat diet group were higher than those of control and resveratrol groups (P < 0.05), and concluded that The TC content in C57BL/6J mice can be decreased by resveratrol (22.5 mg/kg BW).
c. Diabetes and Obesity
According to the study of " Resveratrol, obesity and diabetes." by Szkudelska K, Szkudelski T. (Source from Department of Animal Physiology and Biochemistry, Poznan University of Life Sciences, Poznan, Poland. tszkudel@jay.up.poznan.pl) posted in PubMed, researchers found that The accumulating evidence also indicates the benefits of resveratrol in diabetes and diabetic complications. It is known that resveratrol affects insulin secretion and blood insulin concentration. In animals with hyperinsulinemia, resveratrol was found to reduce blood insulin. Moreover, numerous data indicate that in diabetic rats, resveratrol is able to reduce hyperglycemia. The mechanism of resveratrol's action is complex and is demonstrated to involve both insulin-dependent and insulin-independent effects. These data point to the potential possibility of use of resveratrol in preventing and/or treating both obesity and diabetes.
 
Sources