title: Caffeic acid phenethyl ester, an antioxidant from propolis, protects peripheral blood mononuclear cells of competitive cyclists against hyperthermal stress.
abstract: Hyperthermal stress and resulting free radical generation is known to impair endurance capacity and immune cell redistribution during prolonged exercise. Caffeic acid phenethyl ester (CAPE), a phenolic compound purified from propolis, has many biological and pharmacological activities including antioxidation. To examine whether CAPE has protective effect against hyperthermal stress in athletes, we isolated peripheral blood mononuclear cells (MNC) from competitive cyclists and assessed their response to hyperthermia with or without CAPE pretreatment. We found that pretreatment of cyclists' MNC with CAPE (0, 1, 2, 4 microg/mL) reversed or reduced hyperthermia-induced survival inhibition, necrosis, superoxide production, glutathione depletion, and intracellular superoxide burst in a dose-dependent manner. These results suggest that CAPE may enhance the hyperthermal tolerance in immune mononuclear cells of competitive cyclists.
authors.affiliation: Graduate Inst. of Sport Coaching Science, Chinese Culture Univ., Taipei 111, Taiwan. yu11.tw@yahoo.com.tw
authors.forename: Yu-Jen
authors.initials: YJ
authors.lastname: Chen
authors.forename: Ai-Chun
authors.initials: AC
authors.lastname: Huang
authors.forename: Hen-Hong
authors.initials: HH
authors.lastname: Chang
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Liao
authors.forename: Chii-Ming
authors.initials: CM
authors.lastname: Jiang
authors.forename: Li-Yun
authors.initials: LY
authors.lastname: Lai
authors.forename: Jen-Te
authors.initials: JT
authors.lastname: Chan
authors.forename: Yu-Yawn
authors.initials: YY
authors.lastname: Chen
authors.forename: Jasson
authors.initials: J
authors.lastname: Chiang
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D001642:Bicycling; D002109:Caffeic Acids / Q000494:pharmacology*; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D005080:Exercise Test; D005978:Glutathione / Q000032:analysis; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D066298:In Vitro Techniques; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000473:pathology; D008297:Male; D009336:Necrosis / Q000517:prevention & control; D010626:Phenylethyl Alcohol / Q000031:analogs & derivatives* / Q000494:pharmacology; D010809:Physical Fitness / Q000502:physiology*; D011429:Propolis / Q000737:chemistry; D013312:Stress, Physiological / Q000187:drug effects*; D013481:Superoxides / Q000032:analysis
chemical_list: D000975:Antioxidants; D002109:Caffeic Acids; D013481:Superoxides; D011429:Propolis; C055494:caffeic acid phenethyl ester; D005978:Glutathione; D010626:Phenylethyl Alcohol