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At least 1,369 records · Page 76Linked to original sources
PubMed1975

Cyclic AMP and adenylate cyclase in the inner ear.

The activity of adenylate cyclase and the steady state levels of cyclic AMP (cAMP) were determined in stria vascularis (SV) and organ of Corti (OC) of the guinea pig cochlea. The activities are 12 and 19 pmoles/mg dry weight/minute for OC and SV, respectively. The activity was increased two to four-fold by NaF. The base level of cAMP is 4.2 and 4.4 nmoles/g dry weight in OC and SV, respectively. In contrast to brain, neither ischemia nor barbiturates produced major changes of the steady state levels of cAMP. No in vitro effect of cAMP upon the state of activation of glycogen phosphorylase was noticeable in either tissue. cAMP did not exert a significant in vitro inhibition of strial Na+K+-ATPase. Perilymphatic perfusion of cAMP (10-3 M) and of theophylline (5 times 10-3 M) did not produce changes in the endolymphatic potential (EP), but dibutyryl cAMP (10-3 M) led to a significant increase of EP. The alpha adrenergic blocking agent, phentolamine, produced very complex changes of the cochlear potentials. A possible role of catecholamines and cAMP in the secretory phenomena of the SV and in the transduction and/or transmission processes of the auditory sense organ are discussed.

Action Potentials↗
PubMed1982

Inner ear histopathology in patients treated with cis-platinum.

Temporal bone histopathology was studied in five patients (aged 51-67) who received cis-diamminedichloroplatinum (DDP) chemotherapy for head and neck squamous cell carcinoma. In each case, sensorineural hearing loss occurred during the course of treatment and temporal bones were acquired 3-5 hours postmortem for anatomical study. Scanning electron microscopy revealed acute degenerative changes in cochlear hair cells that appeared to be the result of drug treatment. However, the presence of age-related degeneration made it difficult to unequivocally identify hair cell loss due solely to ototoxicity. In one patient, a decrement in vestibular function was observed during DDP treatment. Postmortem examination showed severe degeneration of the maculae and cristae which could be correlated with the absence of caloric response seen after chemotherapy.

Aged↗
PubMed2004

New aspects of inner ear research.

At birth, one in 850 babies are profoundly deaf, and hearing loss affects more than 50% of all people over 60 years of age. While hearing loss caused by disease of the external and/or middle ear is treatable, hearing loss as a result of damage to and loss of hair cells and/or auditory neurons can only be alleviated using prosthetic devices such as hearings aids or cochlear implants.

Antioxidants↗
PubMed2002

Circling mouse, a spontaneous mutant in the inner ear.

A spontaneous mutant was established in the ICR mouse strain. The affected mice became hyperactive at about 7 days of age, and then showed circling behavior. The body weight decreased significantly 2 weeks after birth, and developmental defects were revealed in the middle ear, cochlea, cochlear nerve, and semicircular canal areas. The mutation was inherited by an autosomal single recessive gene and is referred to as cir.

Animals↗