S-nitrosylation is a redox-sensitive protein modification, which is a highly specific, but reversible mechanism that regulates several signal transduction cascades. Oxidative stress plays a causal role in the ototoxic effects of an anti-neoplastic drug, cisplatin. Despite emerging evidence implicating nitroxidative stress as a critical factor in cisplatin toxicity, the significance of the cochlear protein S-nitrosylation in cisplatin ototoxicity is yet to be understood. In the present study, a 16-mg/kg dose of cisplatin, induced a significant shift in the amplitudes of distortion product otoacoustic emissions, a measure of outer hair cell activity, in Wistar rats, 3 days post-treatment. These ototoxic effects were accompanied by significant increases in the S-nitrosylation of at least three cochlear proteins. Biological significance of these S-nitrosylated proteins was indicated by their immunolocalization in organ of Corti, stria vascularis, and spiral ganglions, which are known cochlear targets of cisplatin toxicity. In addition, co-treatment with Trolox, an inhibitor of peroxynitrite, attenuated cisplatin-induced S-nitrosylation of cochlear proteins and prevented the associated hearing loss. The cisplatin-induced S-nitrosylation of inner ear proteins, their sensitive cochlear localization, and their potential association with cisplatin-induced hearing loss suggests that S-nitrosylation of cochlear proteins might play a crucial role in mediating cisplatin ototoxicity.
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http://dx.doi.org/10.1089/ars.2012.4656 | DOI Listing |
Alzheimers Dement
December 2024
University of Miami, Miami, FL, USA.
Background: Exposures to hazardous noise causes irreversible injury to the structures of the inner ear, leading to changes in hearing and balance function with strong links to age-related cognitive impairment. While the role of noise-induced hearing loss in long-term health consequences, such as progression or development of Alzheimer's Disease (AD) has been suggested, the underlying mechanisms and behavioral and cognitive outcomes or therapeutic solutions to mitigate these changes remain understudied. This study aimed to characterize the association between blast exposure, hearing loss, and the progression of AD pathology, and determine the underlying mechanisms.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
January 2025
School of Biosciences, University of Sheffield, Sheffield S10 2TN, United Kingdom.
Myosin-VIIA (MYO7A) is an unconventional myosin responsible for syndromic (Usher 1B) or nonsyndromic forms of deafness in humans when mutated. In the cochlea, MYO7A is expressed in hair cells, where it is believed to act as the motor protein tensioning the mechanoelectrical transducer (MET) channels, thus setting their resting open probability (). However, direct evidence for this unique role for an unconventional myosin in mature hair cells is lacking.
View Article and Find Full Text PDFFront Mol Neurosci
December 2024
School of Basic Medical Science, Jining Key Laboratory of Pharmacology, Jining Medical University, Jining, Shandong, China.
Int J Med Sci
January 2025
Department of Rheumatism and Immunology, Tianjin First Central hospital, Tianjin, China.
Autoimmune inner ear disease (AIED) is a rare condition characterized by immune-mediated damage to the inner ear, leading to progressive sensorineural hearing loss (SNHL) and vestibular symptoms such as vertigo and tinnitus. This study investigates the pathogenesis and therapeutic strategies for AIED through the analysis of three cases with different underlying autoimmune disorders: rheumatoid arthritis, relapsing polychondritis, and IgG4-related disease. The etiology of AIED involves complex immunopathological mechanisms, including molecular mimicry and the "bystander effect," with specific autoantibodies, such as those against heat shock protein 70 (HSP70), playing a potential role in cochlear damage.
View Article and Find Full Text PDFJ Otol
July 2024
Department of ENT and Head-Neck Surgery, Seth G.S. Medical College and KEM Hospital, Acharya Donde Marg, Parel, Mumbai, Maharashtra, 400012, India.
Thiamine responsive megaloblastic anemia (TRMA), also known as Roger's syndrome, is an exceptionally rare autosomal recessive disorder stemming from mutations in the SLC19A2 gene responsible for encoding a thiamine carrier protein. This syndrome manifests as the classic triad of megaloblastic anemia, sensorineural hearing loss, and diabetes mellitus. Here, we present the case of a one-and-a-half-year-old male infant born to non-consanguineous parents in India, a region where TRMA cases are seldom reported.
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