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2012 ; 147
(2
): 302-7
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Modulation of inflammatory and profibrotic signaling in a rabbit model of acute
phonotrauma using triamcinolone
#MMPMID22399283
Hall JE
; Suehiro A
; Branski RC
; Garrett CG
; Rousseau B
Otolaryngol Head Neck Surg
2012[Aug]; 147
(2
): 302-7
PMID22399283
show ga
OBJECTIVE: To investigate the hypothesis that prophylactic triamcinolone
modulates acute vocal fold inflammatory and profibrotic signaling during acute
phonotrauma. STUDY DESIGN: In vivo rabbit phonation model. SETTING: Academic
medical center. SUBJECTS AND METHODS: Forty New Zealand white breeder rabbits
were randomly assigned to 1 of 4 groups: control (no intervention), no treatment
(30 minutes of raised intensity phonation), sham treatment (bilateral
intralaryngeal triamcinolone acetonide injection at 0 µg/25 µL followed by 30
minutes of raised intensity phonation), or steroid treatment (bilateral
intralaryngeal triamcinolone acetonide injection at 400 µg/25 µL followed by 30
minutes of raised intensity phonation). Quantitative polymerase chain reaction
(qPCR) was used to investigate gene expression levels of cyclooxygenase-2
(COX-2), interleukin (IL)-1?, and transforming growth factor (TGF)-?1. RESULTS:
Results revealed a significant main effect for COX-2 (P = .002). Post hoc testing
revealed that rabbits receiving no treatment (15.10) had higher COX-2 gene
expression than control (5.90; P < .001). There were no significant differences
in COX-2 expression between treatment groups. Results revealed a significant main
effect for IL-1? (P < .001). Post hoc testing revealed that rabbits receiving no
treatment (14.70) had higher IL-1? gene expression than control (6.30) (P =
.001). There were no significant differences in IL-1? gene expression between
treatment groups. There were no significant differences in TGF-?1 gene expression
(P = .525) between treatment and control groups. CONCLUSION: Given conflicting
evidence, further studies are necessary to investigate vocal fold steroid
injections prior to and following the induction of phonotrauma. Prophylactic
administration of triamcinolone immediately prior to acute phonotrauma resulted
in no significant changes in COX-2, IL-1?, and TGF-?1 gene transcript levels.
|Acute Disease
[MESH]
|Animals
[MESH]
|Cyclooxygenase 2/drug effects/genetics
[MESH]
|Disease Models, Animal
[MESH]
|Fibrosis/genetics/prevention & control
[MESH]
|Gene Expression/drug effects
[MESH]
|Glucocorticoids/*therapeutic use
[MESH]
|Inflammation/genetics/prevention & control
[MESH]