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2015 ; 94
(30
): e997
Nephropedia Template TP
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Epigenetic Modifications and Accumulation of DNA Double-Strand Breaks in Oral
Lichen Planus Lesions Presenting Poor Response to Therapy
#MMPMID26222871
Dillenburg CS
; Martins MAT
; Almeida LO
; Meurer L
; Squarize CH
; Martins MD
; Castilho RM
Medicine (Baltimore)
2015[Jul]; 94
(30
): e997
PMID26222871
show ga
Epigenetics refers to changes in cell characteristics that occur independently of
modifications to the deoxyribonucleic acid (DNA) sequence. Alterations mediated
by epigenetic mechanisms are important factors in cancer progression. Although an
exciting prospect, the identification of early epigenetic markers associated with
clinical outcome in premalignant and malignant disorders remains elusive. We
examined alterations in chromatin acetylation in oral lichen planus (OLP) with
distinct clinical behavior and compared the alterations to the levels of DNA
double-strand breaks (DSBs). We analyzed 42 OLP patients, who had different
responses to therapy, for acetyl-histone H3 at lys9 (H3K9ac), which is associated
with enhanced transcription and nuclear decondensation, and the presence of DSBs,
as determined by accumulation of phosphorylated ?H2AX foci. Patients with high
levels of H3K9ac acetylation failed to respond to therapy or experienced disease
recurrence shortly after therapy. Similar to H3K9ac, patients who responded
poorly to therapy had increased accumulation of DNA DSB, indicating genomic
instability. These findings suggest that histone modifications occur in OLP, and
H3K9ac and ?H2AX histones may serve as epigenetic markers for OLP recurrence.