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Effect of vitamin E supplementation on HDL function by haptoglobin genotype in type 1 diabetes: results from the HapE randomized crossover pilot trial.

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  • Additional Information
    • Source:
      Publisher: Springer Verlag Country of Publication: Germany NLM ID: 9200299 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1432-5233 (Electronic) Linking ISSN: 09405429 NLM ISO Abbreviation: Acta Diabetol Subsets: MEDLINE
    • Publication Information:
      Publication: Berlin : Springer Verlag
      Original Publication: Berlin : Springer International, c1991-
    • Subject Terms:
    • Abstract:
      Aims: Haptoglobin (Hp) genotype 2-2 increases cardiovascular diabetes complications. In type 2 diabetes, α-tocopherol was shown to lower cardiovascular risk in Hp 2-2, potentially through HDL function improvements. Similar type 1 diabetes data are lacking. We conducted a randomized crossover pilot of α-tocopherol supplementation on HDL function [i.e., cholesterol efflux (CE) and HDL-associated lipid peroxides (LP)] and lipoprotein subfractions in type 1 diabetes.
      Methods: Hp genotype was assessed in members of two Allegheny County, PA, type 1 diabetes registries and the CACTI cohort; 30 were randomly selected within Hp genotype, and 28 Hp 1-1, 31 Hp 2-1 and 30 Hp 2-2 were allocated to daily α-tocopherol or placebo for 8 weeks with a 4-week washout.
      Results: Baseline CE decreased with the number of Hp 2 alleles (p-trend = 0.003). There were no differences in LP or lipoprotein subfractions. In intention-to-treat analysis stratified by Hp, α-tocopherol increased CE in Hp 2-2 (β = 0.79, p = 0.03) and LP in Hp 1 allele carriers (β Hp 1-1 = 0.18, p = 0.05; β Hp 2-1 = 0.21, p = 0.07); reduced HDL particle size (β = -0.07, p = 0.03) in Hp 1-1 carriers; increased LDL particle concentration in Hp 1-1; and decreased it in Hp 2-2 carriers. However, no significant interactions were observed by Hp.
      Conclusions: In this type 1 diabetes study, HDL function worsened with the number of Hp 2 alleles. α-Tocopherol improved HDL function in Hp 2-2 carriers and appeared to adversely affect lipid peroxides and lipoprotein subfractions among Hp 1 allele carriers. As no significant interactions were observed, findings require replication in larger studies.
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    • Grant Information:
      R01 HL113029 United States HL NHLBI NIH HHS; UL1 TR000005 United States TR NCATS NIH HHS
    • Contributed Indexing:
      Keywords: Double-blinded placebo-controlled randomized trial; HDL function; Haptoglobin genotype; NMR lipoprotein subfractions; Type 1 diabetes; Vitamin E
    • Accession Number:
      0 (Haptoglobins)
      0 (Lipoproteins, HDL)
      0 (Lipoproteins, LDL)
      0 (Vitamins)
      1406-18-4 (Vitamin E)
    • Publication Date:
      Date Created: 20150524 Date Completed: 20161213 Latest Revision: 20181202
    • Publication Date:
      20220902
    • Accession Number:
      PMC4826317
    • Accession Number:
      10.1007/s00592-015-0770-8
    • Accession Number:
      26002590