Autophagy in periodontal ligament fibroblasts under biomechanical loading.

Abstract:

:Autophagy (cellular self-consumption) is an adaptive stress response and an important aspect of adaption to mechanical loading. If mechanical forces are associated with autophagy regulation in periodontal ligament (PDL) fibroblasts is still unknown. The aim of this study was to analyze the influence of force magnitude on autophagy regulation and subsequently on cell death in human PDL fibroblasts. Autophagy-associated genes were analyzed with a specific PrimePCR assay after 24 h of stimulation with high (STSH) and low magnitudes (STSL) of static tensile strain applied to PDL fibroblasts. Based on the results, targets were selected for further real-time PCR analysis. The autophagic flux was assessed by immunoblotting for autophagy marker microtubule-associated protein 1, light chain 3, and by autophagosome staining. Cell death was determined by TUNEL assay and Cell Death Detection ELISAPLUS. Autophagy was induced pharmacologically by rapamycin and inhibited by chloroquine. For statistical analysis, the Kruskal Wallis test followed by the post-hoc Dunnett's test was used. Static tensile strain had regulatory effects on mRNA expression of multiple autophagy-associated targets. Stimulation with STSH induced mRNA expression changes in more autophagy-associated targets than STSL. The autophagic flux was induced by STSH while STSL had no significant effect on autophagosome formation. Furthermore, autophagy inhibition led to increased cell death. Low magnitudes of tensile strain seem to have cell-protective properties. Taken together, our findings provide novel insights about autophagy regulation by biomechanical loading in human PDL fibroblasts. Our results suggest a gradual response of autophagy to static tensile strain in human PDL fibroblasts.

journal_name

Cell Tissue Res

journal_title

Cell and tissue research

authors

Memmert S,Damanaki A,Weykopf B,Rath-Deschner B,Nokhbehsaim M,Götz W,Gölz L,Till A,Deschner J,Jäger A

doi

10.1007/s00441-019-03063-1

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

499-511

issue

3

eissn

0302-766X

issn

1432-0878

pii

10.1007/s00441-019-03063-1

journal_volume

378

pub_type

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