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Transglutaminase 2 up-regulation is associated with RANKL/OPG pathway in cultured HPDL cells and THP-1-differentiated macrophages

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Abstract

Recent evidence emphasized that transglutaminase 2 (TG2), a protein cross-linking enzyme, may play a role in the early phase of inflammation. High levels of TG2 have been associated with the constitutive activation of nuclear factor-kappa B (NF-κB) that is considered the main regulator of inflammation. In this context, the receptor activator of NF-kappa B ligand (RANKL) and receptor activator of NF-κB have extensive functions in the regulation of cytokine secretion associated with different pathological conditions. The human periodontal ligament (HPDL) cells, which express and secrete osteoprotegerin (OPG) and RANKL, represent an useful “ex vivo” model for monitoring cell response in inflammatory microenvironments, such as periodontitis-dependent tissue response. Thus, we evaluated TG2 expression and alterations in RANKL/OPG ratio occurring in cultured HPDL cells. The HPDL cells were obtained from patients with chronic periodontitis (CP) and healthy subjects. We observed the up-regulation of some inflammatory markers, such as IL-6, TNF-α, and HMGB-1, and at the same time an increase in TG2 mRNA levels in HPDL cells from CP patients compared with healthy subjects. We found a positive correlation between RANKL/OPG ratio and TG2 mRNA levels in HPDL cells from CP patients. In the parallel experiments, we demonstrated that TG2 inhibition reduced RANKL expression in both HPDL cells from CP patients and monocytes differentiated to macrophages by tetradecanoyl phorbol acetate treatment. Given the RANKL key role in NF-κB pathway and the observed up-regulation of pro-inflammatory cytokines, our data suggest that TG2 may be involved in molecular mechanisms of inflammatory response occurring in periodontal disease.

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Abbreviations

ALP:

Alkaline phosphatase

BAPA:

5-(Biotinamido)pentylamine

CP:

Chronic periodontitis

FBS:

Fetal bovine serum

FMOD:

Fibromodulin

HPDL:

Human periodontal ligament

HMGB1:

High mobility group box 1

IL-6:

Interleukin-6

LUM:

Lumican

NF-κB:

Nuclear factor-kappa B

RANKL:

Receptor activator of nuclear factor-kappa B ligand

OPG:

Osteoprotegerin

PDL:

Periodontal ligament

TNF-α:

Tumor necrosis factor-α

TG2:

Tissue-type transglutaminase

TG:

Transglutaminase

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Correspondence to Riccardo Ientile.

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This work has been performed with Departmental funding only. The authors declare that they have no conflict of interest to declare.

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Handling Editor: S. Beninati.

G. Matarese, M. Currò and G. Isola are contributed equally to this work and share the first authorship.

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Matarese, G., Currò, M., Isola, G. et al. Transglutaminase 2 up-regulation is associated with RANKL/OPG pathway in cultured HPDL cells and THP-1-differentiated macrophages. Amino Acids 47, 2447–2455 (2015). https://doi.org/10.1007/s00726-015-2039-5

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  • DOI: https://doi.org/10.1007/s00726-015-2039-5

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