title: Cross-sex hormonal replacement: is this really effective? an experimental clue.
abstract: Castrated rats of either sex were used in this work, and sex hormones of their own gender or cross-sex hormones were administered for 4 months. Animals were then put through 5 min of myocardial ischemia followed by a 5-min reperfusion injury. Electrocardiographic recordings were made and serum was obtained. Sex hormone levels were measured. Cardiac frequency was calculated, arterial pressure was determined, and the levels of lactate dehydrogenase (LDH), creatinine kinase (CK), and thiobarbituric acid reactive species (TBARs) were analyzed. Proinflammatory cytokine levels were measured in homogenized hearts; besides this, five hearts of each experimental group were obtained and fixed for histopathologic analysis. In male rats with estradiol replacement, the incidence of tachyarrhythmias and CK levels were higher when compared to the rest of the animals. Their cytokine levels were also elevated when compared to the group that received testosterone. Estradiol replacement protected female rats from variations in all of the parameters evaluated, whereas testosterone did not show a protective effect. In the presence of testosterone, the incidence of tachyarrhythmia was higher and TBARs, cytokines, CK, and LDH levels were also elevated. The results shown reinforce the idea that cross-sex hormone administration can damage the cardiovascular system.
authors: Departamento de Bioquímica, Instituto Nacional de Cardiología, Juan Badiano #1, Col. Sección XVI, 14080, Mexico, D.F., Mexico, pavitonat@yahoo.com.mx.
authors: Natalia
authors: N
authors: Pavón
authors: Israel
authors: I
authors: Pérez-Torres
authors: Alberto
authors: A
authors: Aranda
authors: Francisco-Javier
authors: FJ
authors: Roldán
authors: Cristina
authors: C
authors: Paredes
authors: Edmundo
authors: E
authors: Chávez
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D003402:Creatine Kinase / Q000097:blood; D016207:Cytokines / Q000378:metabolism; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D012739:Gonadal Steroid Hormones / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects* / Q000503:physiopathology; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008297:Male; D015428:Myocardial Reperfusion Injury / Q000097:blood / Q000503:physiopathology; D009206:Myocardium / Q000378:metabolism; D051381:Rats; D013739:Testosterone / Q000494:pharmacology*; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D016207:Cytokines; D012739:Gonadal Steroid Hormones; D017392:Thiobarbituric Acid Reactive Substances; D013739:Testosterone; D004958:Estradiol; D007770:L-Lactate Dehydrogenase; D003402:Creatine Kinase