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Int J Radiat Biol. 2012 Apr;88(4):335-47. doi: 10.3109/09553002.2012.652723. Epub 2012 Feb 6.

MyD88 provides a protective role in long-term radiation-induced lung injury.

Author information

  • 1Department of Microbiology/Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Abstract

PURPOSE:

The role of innate immune regulators is investigated in injury sustained from irradiation as in the clinic for cancer treatment or from a nuclear incident. The protective benefits of flagellin signaling through Toll-like receptors (TLR) in an irradiation setting warrant study of a key intracellular adaptor of TLR signaling, namely Myeloid differentiation primary response factor 88 (MyD88). The role of MyD88 in regulating innate immunity and Nuclear factor kappa-B (NF-κB)-activated responses targets this critical factor for influencing injury and recovery as well as maintaining immune homeostasis.

MATERIALS AND METHODS:

To examine the role of MyD88, we examined immune cells and factors during acute pneumonitic and fibrotic phases in Myd88-deficient animals receiving thoracic gamma (γ)-irradiation.

RESULTS:

We found that MyD88 supports survival from radiation-induced injury through the regulation of inflammatory factors that aid in recovery from irradiation. The absence of MyD88 resulted in unresolved pulmonary infiltrate and enhanced collagen deposition plus elevated type 2 helper T cell (Th2) cytokines in long-term survivors of irradiation.

CONCLUSIONS:

These results based only on a gene deletion model suggest that alterations of MyD88-dependent inflammatory processes impact chronic lung injury. Therefore, MyD88 may contribute to attenuating long-term radiation-induced lung injury and protecting against fibrosis.

PMID:
22248128
[PubMed - indexed for MEDLINE]
PMCID:
PMC3629725
Free PMC Article

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