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The Antimicrobial Peptide LL-37 Alters Human Osteoblast Ca Handling and Induces Ca(2+)-Independent Apoptosis.

In English

Författare

Summary, in English

The human antimicrobial peptide cathelicidin LL-37 has, besides its antimicrobial properties, also been shown to regulate apoptosis in a cell type-specific manner. Mechanisms involved in LL-37-regulated apoptotic signaling are not identified. Here, we show that LL-37 reduces the human osteoblast-like MG63 cell number and cell viability in the micromolar concentration range with an IC(50) value of about 5 µM. Treatment with 4 µM LL-37 increased the number of annexin V-positive cells and stimulated activation of caspase 3 showing that LL-37 promotes apoptosis. Treatment with 4 µM LL-37 caused an acute and sustained rise in intracellular Ca(2+) concentration assessed by laser-scanning confocal microscopy of Fluo-4-AM-loaded MG63 cells. LL-37 increased Ca(2+) also in the presence of the respective L- and T-type voltage-sensitive Ca(2+) channel blockers nifedipine and NiCl(2). LL-37 had no effect on Ca(2+) in cells incubated with Ca(2+)-free solution. LL-37 (4 and 8 µM) reduced the MG63 cell number both in the presence and absence of Ca(2+) in the medium. In conclusion, LL-37 reduces the osteoblast cell number by promoting apoptosis, and furthermore, LL-37 stimulates Ca(2+) inflow via a mechanism independent of voltage-sensitive Ca(2+) channels. Interestingly, LL-37-induced lowering of the cell number seems to be mediated via a mechanism independent of Ca(2+).

Publiceringsår

2013

Språk

Engelska

Sidor

290-300

Publikation/Tidskrift/Serie

Journal of Innate Immunity

Volym

5

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Karger

Ämne

  • Immunology in the medical area

Status

Published

Projekt

  • Effects of the antimicrobial peptide LL-37 on host cell viability

Forskningsgrupp

  • Vascular Physiology

ISBN/ISSN/Övrigt

  • ISSN: 1662-811X