7DHC-induced changes of Kv1.3 operation contributes to modified T cell function in Smith-Lemli-Opitz syndrome

András Balajthy, Sándor Somodi, Zoltán Pethő, Mária Péter, Zoltán Varga, Gabriella P. Szabó, György Paragh, László Vígh, György Panyi, Péter Hajdu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In vitro manipulation of membrane sterol level affects the regulation of ion channels and consequently certain cellular functions; however, a comprehensive study that confirms the pathophysiological significance of these results is missing. The malfunction of 7-dehydrocholesterol (7DHC) reductase in Smith-Lemli-Opitz syndrome (SLOS) leads to the elevation of the 7-dehydrocholesterol level in the plasma membrane. T lymphocytes were isolated from SLOS patients to assess the effect of the in vivo altered membrane sterol composition on the operation of the voltage-gated Kv1.3 channel and the ion channel-dependent mitogenic responses. We found that the kinetic and equilibrium parameters of Kv1.3 activation changed in SLOS cells. Identical changes in Kv1.3 operation were observed when control/healthy T cells were loaded with 7DHC. Removal of the putative sterol binding sites on Kv1.3 resulted in a phenotype that was not influenced by the elevation in membrane sterol level. Functional assays exhibited impaired activation and proliferation rate of T cells probably partially due to the modified Kv1.3 operation. We concluded that the altered membrane sterol composition hindered the operation of Kv1.3 as well as the ion channel-controlled T cell functions.

Original languageEnglish
Pages (from-to)1403-1418
Number of pages16
JournalPflugers Archiv European Journal of Physiology
Volume468
Issue number8
DOIs
Publication statusPublished - Aug 1 2016

Keywords

  • 7-Dehydrocholesterol
  • Cholesterol
  • Kv1.3
  • Smith-Lemli-Opitz syndrome
  • Voltage-gated ion channel

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)

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