title: Responses of HDL subclasses, Lp(A-I) and Lp(A-I:A-II) levels and lipolytic enzyme activities to continuous oral estrogen-progestin and transdermal estrogen with cyclic progestin regimens in postmenopausal women.
abstract: Seventy postmenopausal women took part in the study. Subjects received either continuous oral 17 beta-estradiol 2 mg/day combined with norethisterone acetate 1 mg/day (E2/NETA, Kliogest) or transdermal treatment consisting of 28 day cycles with patches delivering 17 beta-estradiol 50 micrograms/day (Estraderm) combined with cyclic medroxyprogesterone acetate 10 mg/day (E2/MPA, Provera), on days 17-28. At baseline the serum lipid and lipoprotein concentrations, composition and concentrations of high density lipoprotein (HDL) subclasses, lipoprotein (Lp)(AI) and Lp(A-I:A-II) levels were comparable in the two groups. In the E2/NETA group, after 12 months hormone replacement therapy (HRT), the HDL2 cholesterol concentration decreased by 17% (P < 0.01) and the HDL3 cholesterol remained unchanged. The concentrations of HDL2b, HDL2a and HDL3a were reduced by 30, 26 and 15%, respectively, P < 0.001, and the cholesterol:triglyceride ratio decreased significantly in all HDL subclasses. Apolipoprotein (apo) A-I concentration decreased by 5% (P < 0.05), but apo A-II, Lp(A-I) and Lp(A-I:A-II) concentrations remained unchanged. In the E2/MPA group the HDL2 and HDL3 cholesterol levels were both reduced by 6% (P < 0.05) and the HDL3a, HDL3b and HDL3c concentrations decreased by 14, 12 and 17% during the E2/MPA phase compared with baseline (P < 0.01). No major changes in the composition of HDL subclasses occurred in the E2 MPA group during treatment. The apo A-I and Lp(A-I) levels were not changed, but apo A-II and Lp(A-I:A-II) concentrations decreased by 8 and 5%, P < 0.001 and P < 0.05, respectively. At 12 months the postheparin plasma hepatic lipase (HL) activity decreased only in the E2/NETA group (by 12%, P < 0.05). The cholesteryl ester transfer protein (CETP) activity was not affected by either HRT regimen. The results of our study show that the 2 HRT regimens have multiple effects on HDL particles and HRT induced changes in HDL are not associated with changes in activities of lipolytic enzymes or CETP.
authors.affiliation: Department of Medicine, Helsinki University Central Hospital, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Tilly-Kiesi
authors.forename: J
authors.initials: J
authors.lastname: Kahri
authors.forename: T
authors.initials: T
authors.lastname: Pyörälä
authors.forename: J
authors.initials: J
authors.lastname: Puolakka
authors.forename: H
authors.initials: H
authors.lastname: Luotola
authors.forename: M
authors.initials: M
authors.lastname: Lappi
authors.forename: S
authors.initials: S
authors.lastname: Lahdenperä
authors.forename: M R
authors.initials: MR
authors.lastname: Taskinen
mesh_terms: D000279:Administration, Cutaneous; D000284:Administration, Oral; D016632:Apolipoprotein A-I / Q000097:blood; D016633:Apolipoprotein A-II / Q000097:blood; D002352:Carrier Proteins / Q000097:blood; D053480:Cholesterol Ester Transfer Proteins; D008076:Cholesterol, HDL / Q000097:blood; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology*; D015914:Estrogen Replacement Therapy; D005260:Female; D006023:Glycoproteins; D006493:Heparin / Q000494:pharmacology; D006801:Humans; D008066:Lipolysis / Q000187:drug effects*; D017270:Lipoprotein(a) / Q000031:analogs & derivatives* / Q000097:blood; D008075:Lipoproteins, HDL / Q000097:blood* / Q000145:classification; D017258:Medroxyprogesterone Acetate / Q000008:administration & dosage / Q000494:pharmacology*; D008875:Middle Aged; D009640:Norethindrone / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D000077563:Norethindrone Acetate; D017698:Postmenopause / Q000097:blood*; D045167:Progesterone Congeners / Q000008:administration & dosage / Q000494:pharmacology*; D014280:Triglycerides / Q000097:blood
chemical_list: D016632:Apolipoprotein A-I; D016633:Apolipoprotein A-II; C506642:CETP protein, human; D002352:Carrier Proteins; D053480:Cholesterol Ester Transfer Proteins; D008076:Cholesterol, HDL; D006023:Glycoproteins; D017270:Lipoprotein(a); D008075:Lipoproteins, HDL; D045167:Progesterone Congeners; D014280:Triglycerides; C106575:lipoprotein A-II; D004958:Estradiol; C078260:lipoprotein A-I; D006493:Heparin; D000077563:Norethindrone Acetate; D017258:Medroxyprogesterone Acetate; D009640:Norethindrone