title: (-)-Epigallocatechin-3-O-gallate (EGCG) attenuates the hemodynamics stimulated by caffeine through decrease of catecholamines release.
abstract: A human study of the effects on hemodynamics of caffeine and epigallocatechin-3-O-gallate (EGCG) was performed. Caffeine tablets (200 mg) were orally administered to healthy males aged between 25 and 35 years 30 min after oral administration of EGCG tablets (100 and 200 mg). The increase in BP induced by caffeine was inhibited when co-administrated with EGCG. We found that caffeine slightly decreased heart rate (HR) in the volunteers. Although EGCG enhanced HR reduction, the effect was not significant. In addition, caffeine increased blood catecholamine levels, but EGCG inhibited the increase in noradrenaline, adrenaline and dopamine levels induced by caffeine. Whether EGCG decreases the elevated HR and systolic perfusion pressure, and ventricular contractility induced by adrenergic agonists in the isolated rat heart was investigated. The modified Krebs-Henseleit solution was perfused through a Langendorff apparatus to the isolated hearts of rats. HR, systolic perfusion pressure, and developed maximal rates of contraction (+dP/dtmax) and relaxation (-dP/dtmax) were increased by epinephrine (EP) and isoproterenol (IP). In contrast, EGCG decreased the elevated HR, systolic perfusion pressure, and left ventricular ±dp/dtmax induced by EP and/or IP. In conclusion, EGCG could attenuate the hemodynamics stimulated by caffeine through decreasing catecholamine release.
authors.affiliation: College of Veterinary Medicine, Chungbuk National University, Cheongju, 362-763, Republic of Korea.
authors.forename: Jin-Yi
authors.initials: JY
authors.lastname: Han
authors.affiliation: College of Oriental Medicine, Wonkwang University, Iksan, 579-749, Republic of Korea.
authors.forename: Yong-Jin
authors.initials: YJ
authors.lastname: Moon
authors.affiliation: College of Oriental Medicine, Wonkwang University, Iksan, 579-749, Republic of Korea.
authors.forename: Jong-Hyun
authors.initials: JH
authors.lastname: Han
authors.affiliation: College of Veterinary Medicine, Chonbuk National University, Jeonju, 579-749, Republic of Korea.
authors.forename: Jong-Hoon
authors.initials: JH
authors.lastname: Kim
authors.affiliation: College of Pharmacy and Medical Research Center (MRC), Chungbuk National University, Cheongju, 28644, Republic of Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Woo
authors.affiliation: College of Pharmacy and Medical Research Center (MRC), Chungbuk National University, Cheongju, 28644, Republic of Korea.
authors.forename: Hwan-Soo
authors.initials: HS
authors.lastname: Yoo
authors.affiliation: College of Pharmacy and Medical Research Center (MRC), Chungbuk National University, Cheongju, 28644, Republic of Korea.
authors.forename: Jin Tae
authors.initials: JT
authors.lastname: Hong
authors.affiliation: College of Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea.
authors.forename: Hee-Yul
authors.initials: HY
authors.lastname: Ahn
authors.affiliation: College of Medicine, Chungbuk National University, Cheongju, 28644, Republic of Korea. hongjm@chungbuk.ac.kr.
authors.forename: Jong-Myeon
authors.initials: JM
authors.lastname: Hong
authors.affiliation: College of Pharmacy and Medical Research Center (MRC), Chungbuk National University, Cheongju, 28644, Republic of Korea. kiwan@chungbuk.ac.kr.
authors.forename: Ki-Wan
authors.initials: KW
authors.lastname: Oh
mesh_terms: D000328:Adult; D000818:Animals; D002110:Caffeine / Q000008:administration & dosage* / Q000378:metabolism; D002392:Catechin / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000378:metabolism; D002395:Catecholamines / Q000037:antagonists & inhibitors* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions / Q000502:physiology; D006439:Hemodynamics / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D002395:Catecholamines; D002110:Caffeine; D002392:Catechin; C045651:epigallocatechin gallate
keywords: Blood pressure; Caffeine; Catecholamines; Counteraction; Epigallocatechin-3-O-gallate (EGCG); Heart rate; Hemodynamics