Expression of adhesion molecular proteins in the cochlear lateral wall of normal and PARP-1 mutant mice

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Sound can damage peripheral cochlear function through a number of mechanisms, and emerging evidence suggests that inflammation may be one of them. Using immunohistochemistry and poly (ADP-ribose) polymerase-1 (PARP-1) mutant mice, we tested whether PARP-1 contributes to loud-sound induced cochlear lateral wall damage by triggering inflammatory effects, including upregulating intercellular adhesion molecule-1 (ICAM-1), P-selectin and platelet-endothelial cell-adhesion molecule-1 (PECAM-1). In control conditions, we found that there was no detectable poly-ADP-ribose (PAR) in the marginal cells and microvessels. ICAM-1 was expressed only at low levels in the vessels of the stria vascularis and the spiral ligament. P-selectin and PECAM-1 were barely detected and only in the vessels of the spiral ligament. Following loud-sound exposure, PAR was detected in numbers of marginal cells and some vessels of the spiral ligament. Also, an elevated expression of ICAM-1 was demonstrated in some vessels of the stria vascularis and spiral ligament. Increased expression of P-selectin and PECAM-1 were mainly located in the vessels of the spiral ligament, while increased populations of non-migrated and migrated leukocytes were observed in the area of the spiral ligament. However, neither increased expression of adhesion proteins nor increased population of leukocytes, were observed in the PARP-1 knockout mouse. We thus conclude that loud-sound stress activates the expression of adhesion molecular proteins in the lateral wall and that PARP-1 modulates inflammation-linked protein expression and leukocyte migration.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalHearing Research
Volume224
Issue number1-2
DOIs
StatePublished - Feb 2007

Fingerprint

Spiral Ligament of Cochlea
Cochlea
CD31 Antigens
P-Selectin
Intercellular Adhesion Molecule-1
Stria Vascularis
Poly Adenosine Diphosphate Ribose
Proteins
Leukocytes
Inflammation
Microvessels
Knockout Mice
Population
Mouse Parp1 protein
Cell Count
Immunohistochemistry

Keywords

  • ICAM-1
  • Leukocyte emigration
  • P-selectin
  • PECAM-1
  • Spiral ligament
  • Stria vascularis

ASJC Scopus subject areas

  • Sensory Systems

Cite this

Expression of adhesion molecular proteins in the cochlear lateral wall of normal and PARP-1 mutant mice. / Shi, Xiao; Nuttall, Alfred.

In: Hearing Research, Vol. 224, No. 1-2, 02.2007, p. 1-14.

Research output: Contribution to journalArticle

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AB - Sound can damage peripheral cochlear function through a number of mechanisms, and emerging evidence suggests that inflammation may be one of them. Using immunohistochemistry and poly (ADP-ribose) polymerase-1 (PARP-1) mutant mice, we tested whether PARP-1 contributes to loud-sound induced cochlear lateral wall damage by triggering inflammatory effects, including upregulating intercellular adhesion molecule-1 (ICAM-1), P-selectin and platelet-endothelial cell-adhesion molecule-1 (PECAM-1). In control conditions, we found that there was no detectable poly-ADP-ribose (PAR) in the marginal cells and microvessels. ICAM-1 was expressed only at low levels in the vessels of the stria vascularis and the spiral ligament. P-selectin and PECAM-1 were barely detected and only in the vessels of the spiral ligament. Following loud-sound exposure, PAR was detected in numbers of marginal cells and some vessels of the spiral ligament. Also, an elevated expression of ICAM-1 was demonstrated in some vessels of the stria vascularis and spiral ligament. Increased expression of P-selectin and PECAM-1 were mainly located in the vessels of the spiral ligament, while increased populations of non-migrated and migrated leukocytes were observed in the area of the spiral ligament. However, neither increased expression of adhesion proteins nor increased population of leukocytes, were observed in the PARP-1 knockout mouse. We thus conclude that loud-sound stress activates the expression of adhesion molecular proteins in the lateral wall and that PARP-1 modulates inflammation-linked protein expression and leukocyte migration.

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