Antibiotics that cause hearing loss in newborns,ears ringing and sore jaw glands,dog hearing loss after ear infection baby,lessen tinnitus symptoms - Plans On 2016

19.09.2013
Therapeutic drugs with ototoxic side effects cause significant hearing loss for thousands of patients annually. The two compositionally distinct extracellular cochlear fluids, endolymph and perilymph, are separated by tight junctions that outline the scala media and reticular lamina.
Inner ear hair cells convert the mechanical stimuli of sound, gravity, and head movement into electrical signals.
Mutations in human SLC26A4 are a common cause of hearing loss associated with enlarged vestibular aqueducts (EVA). Byung Yoon Choi, Hyoung-Mi Kim, Taku Ito, Kyu-Yup Lee, Xiangming Li, Kelly Monahan, Yaqing Wen, Elizabeth Wilson, Kiyoto Kurima, Thomas L.
Today, aminoglycoside antibiotics are the most commonly used antibiotics worldwide because of their high efficacy combined with low cost.
Aminoglycoside antibiotics chelate iron, and the resulting iron-aminoglycoside complex is redox-active, catalyzing the formation of free radicals.
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Additionally, our hearing ability gets worse at the age of from 30 to 40 and can be led to hearing loss at the age of 80. Such noises from workplace, music, concert, MP3, vehicles, and so on can increase the risk of being hearing-impaired. To be specific, some certain antibiotics and cancer drugs as well as some other drugs such as aspirin, NSAIDs, and acetaminophen lead to some side effects that are the main reason for hearing loss. Aminoglycosides are widely used broad-spectrum antibiotics, but they inflict permanent hearing loss in up to ~50% of patients by causing selective sensory hair cell loss. Sound coding with current prostheses is based on electrical stimulation of auditory neurons and has limited frequency resolution due to broad current spread within the cochlea. Hernandez, Anna Gehrt, Kirsten Reuter, Zhizi Jing, Marcus Jeschke, Alejandro Mendoza Schulz, Gerhard Hoch, Matthias Bartels, Gerhard Vogt, Carolyn W. Two major classes of ototoxic drugs are cisplatin and the aminoglycoside antibiotics, both of which are toxic to mechanosensory hair cells, the receptor cells of the inner ear.
Mutations in TRIC (also known as MARVELD2), which encodes a tricellular tight junction protein known as tricellulin, lead to nonsyndromic hearing loss (DFNB49).
We determined that progressive high-frequency hearing loss in 2 families of Iraqi Jewish ancestry was due to homozygosity for the protein truncating mutation SYNE4 c.228delAT.
This mechanotransduction process is initiated by opening of cation channels near the tips of hair cell stereocilia. Geleoc, Kiyoto Kurima, Valentina Labay, Andrea Lelli, Yukako Asai, Tomoko Makishima, Doris K.
SLC26A4 encodes pendrin, an anion-base exchanger expressed in inner ear epithelial cells that secretes HCO3– into endolymph. However, toxicity to the kidney (nephrotoxicity) and the inner ear (ototoxicity) are two major side effects. Free radicals cause tissue damage while endogenous antioxidant systems limit the extent of toxicity.
Hearing loss can grow as the newborn is premature or from such other causes as trauma during birth leading to the infant getting inadequate oxygen. Here, we hypothesized that reducing aminoglycoside entry into hair cells via mechanotransducer channels would reduce ototoxicity, and therefore we synthesized 9 aminoglycosides with modifications based on biophysical properties of the hair cell mechanotransducer channel and interactions between aminoglycosides and the bacterial ribosome.
In contrast, optical stimulation can be spatially confined, which may improve frequency resolution. A critical need exists for therapies that protect the inner ear without inhibiting the therapeutic efficacy of these drugs. We generated a knockin mouse that carries a mutation orthologous to the TRIC coding mutation linked to DFNB49 hearing loss in humans.
SYNE4, a gene not previously associated with hearing loss, encodes nesprin-4 (NESP4), an outer nuclear membrane (ONM) protein expressed in the hair cells of the inner ear. Since the identity of these ion channels is unknown, and mutations in the gene encoding transmembrane channel–like 1 (TMC1) cause hearing loss without vestibular dysfunction in both mice and humans, we investigated the contribution of Tmc1 and the closely related Tmc2 to mechanotransduction in mice.


Studies of Slc26a4-null mice indicate that pendrin is essential for inner ear development, but have not revealed whether pendrin is specifically necessary for homeostasis. This review presents a novel hypothesis of aminoglycoside ototoxicity and reports on a successful approach to its prevention. Consequently, ototoxicity can be prevented through the administration of antioxidants and iron chelators.
Compared with the parent aminoglycoside sisomicin, all 9 derivatives displayed no or reduced ototoxicity, with the lead compound N1MS 17 times less ototoxic and with reduced penetration of hair cell mechanotransducer channels in rat cochlear cultures. Here, we used animal models to characterize optogenetic stimulation, which is the optical stimulation of neurons genetically engineered to express the light-gated ion channel channelrhodopsin-2 (ChR2). The induction of heat shock proteins (HSPs) inhibits both aminoglycoside- and cisplatin-induced hair cell death and hearing loss. Tricellulin was absent from the tricellular junctions in the inner ear epithelia of the mutant animals, which developed rapidly progressing hearing loss accompanied by loss of mechanosensory cochlear hair cells, while the endocochlear potential and paracellular permeability of a biotin-based tracer in the stria vascularis were unaltered. We found that Tmc1 and Tmc2 were expressed in mouse vestibular and cochlear hair cells and that GFP-tagged TMC proteins localized near stereocilia tips. Slc26a4-null mice are profoundly deaf, with severe inner ear malformations and degenerative changes that do not model the less severe human phenotype. Both hearing loss and vestibular dysfunction induced by several aminoglycosides were significantly attenuated by antioxidant therapy in guinea pigs without compromising the antibacterial efficacy of the drugs. Optogenetic stimulation of spiral ganglion neurons (SGNs) activated the auditory pathway, as demonstrated by recordings of single neuron and neuronal population responses. We hypothesized that exposure to sound that is titrated to stress the inner ear without causing permanent damage would induce HSPs in the cochlea and inhibit ototoxic drug–induced hearing loss. Freeze-fracture electron microscopy revealed disruption of the strands of intramembrane particles connecting bicellular and tricellular junctions in the inner ear epithelia of tricellulin-deficient mice. NESP4 and SUN domain–containing protein 1 (SUN1), which localizes to the inner nuclear membrane (INM), are part of the linker of nucleoskeleton and cytoskeleton (LINC) complex in the nuclear envelope.
Tmc2 expression was transient in early postnatal mouse cochlear hair cells but persisted in vestibular hair cells. Here, we describe studies in which we generated a binary transgenic mouse line in which Slc26a4 expression could be induced with doxycycline. This finding may lead to a safe and effective way to eliminate the threat of ototoxicity by this indispensable class of antibiotics.
We developed a sound exposure protocol that induces HSPs without causing permanent hearing loss. These ultrastructural changes may selectively affect the paracellular permeability of ions or small molecules, resulting in a toxic microenvironment for cochlear hair cells.
While mice with a targeted deletion of Tmc1 (Tmc1? mice) were deaf and those with a deletion of Tmc2 (Tmc2? mice) were phenotypically normal, Tmc1?Tmc2? mice had profound vestibular dysfunction, deafness, and structurally normal hair cells that lacked all mechanotransduction activity. The transgenes were crossed onto the Slc26a4-null background so that all functional pendrin was derived from the transgenes. Approximation of the spatial spread of cochlear excitation by recording local field potentials (LFPs) in the inferior colliculus in response to suprathreshold optical, acoustic, and electrical stimuli indicated that optogenetic stimulation achieves better frequency resolution than monopolar electrical stimulation. We used this protocol in conjunction with a newly developed mouse model of cisplatin ototoxicity and found that preconditioning mouse inner ears with sound has a robust protective effect against cisplatin-induced hearing loss and hair cell death. Consistent with this hypothesis, hair cell loss was rescued in tricellulin-deficient mice when generation of normal endolymph was inhibited by a concomitant deletion of the transcription factor, Pou3f4.
Expression of either exogenous TMC1 or TMC2 rescued mechanotransduction in Tmc1?Tmc2? mutant hair cells. Varying the temporal expression of Slc26a4 revealed that E16.5 to P2 was the critical interval in which pendrin was required for acquisition of normal hearing. Virus-mediated expression of a ChR2 variant with greater light sensitivity in SGNs reduced the amount of light required for responses and allowed neuronal spiking following stimulation up to 60 Hz.
Finally, comprehensive phenotypic screening showed a broader pathological phenotype in the mutant mice, which highlights the non-redundant roles played by tricellulin. The nuclei of OHCs from mutant mice failed to maintain their basal localization, potentially affecting cell motility and hence the response to sound.


Our results indicate that TMC1 and TMC2 are necessary for hair cell mechanotransduction and may be integral components of the mechanotransduction complex. Lack of pendrin during this period led to endolymphatic acidification, loss of the endocochlear potential, and failure to acquire normal hearing. Our study demonstrates a strategy for optogenetic stimulation of the auditory pathway in rodents and lays the groundwork for future applications of cochlear optogenetics in auditory research and prosthetics.
These data indicate that sound preconditioning protects against both classes of ototoxic drugs, and they suggest that sound therapy holds promise for preventing hearing loss in patients receiving these drugs. These results demonstrate that the LINC complex is essential for viability and normal morphology of OHCs and suggest that the position of the nucleus in sensory epithelial cells is critical for maintenance of normal hearing.
Our data also suggest that persistent TMC2 expression in vestibular hair cells may preserve vestibular function in humans with hearing loss caused by TMC1 mutations. Moreover, systemic sisomicin treatment of mice resulted in 75% to 85% hair cell loss and profound hearing loss, whereas N1MS treatment preserved both hair cells and hearing.
These data collectively provide mechanistic insight into hearing loss caused by SLC26A4 mutations and establish a model for further studies of EVA-associated hearing loss. Direct detection of ototoxicant-induced reactive oxygen species generation in cochlear explants. Together, our findings establish N1MS as a nonototoxic aminoglycoside and support targeted modification as a promising approach to generating nonototoxic antibiotics. Aminoglycoside antibiotics impair calcium-entry but not viability and motility of cochlear outer hair cells.
Polymorphonuclear leukocyte-mediated cell and tissue injury: Oxygen metabolites and their relations to human disease. Determinants of the in vitro interaction of polyaspartic acid and aminoglycoside antibiotics. Ototoxicity of aminoglycosides correlated with their action on monomolecular films of polyphosphoinositides. Risk factors for the development of auditory toxicity in patients receiving aminoglycosides. Chelation therapy in beta-thalassemia major: a one-year double blind study of 2,3-dihydroxybenzoic acid. Mitochondrial ribosomal RNA mutation associated with both antibiotic-induced and non-syndromic deafness. Streptomycin, a substance exhibiting antibiotic activity against gram-positive and gram-negative bacteria. Aminoglycosides and polyamines: Targets and effects in the mammalian organism of two important groups of natural aliphatic polycations.
Antioxidants attenuate gentamicin-induced free-radical formation in vitro and ototoxicity in vivo: D-methionine is a potential protectant.
Transgenic mice overexpressing copper-zinc superoxide dismutase are protected from kanamycin-induced ototoxicity.
HIV prevalence, immunosuppression, and drug resistance in patients with tuberculosis in an area endemic for AIDS. Variable efficacy of radical scavengers and iron chelators to attenuate gentamicin ototoxicity in guinea pig in vivo. Isepamicin sulfate-induced sensorineural hearing loss in patients with the 1555 A -* G mitochondrial mutation.
Differential cellular distribution of glutathione-an endogenous antioxidant-in the guinea pig inner ear. Regenerative prolifer-ation in inner ear sensory epithelia from adult guinea pigs and humans. Evidence for role of hydroxyl radical in complement and neutrophil-dependent tissue injury.



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