Thursday, 18 October 2018

Deafness. It could be reversed...

Break open the bubbly lads!

Deafness could be reversed, research suggests. Scientists have discovered how to regrow cells in the ear that are critical for hearing. 

Deafness could be reversed as scientists discover how to re-grow lost cells in the ear (stock)Viruses, genetics and even existing drugs could trigger little hairs to regrow in the inner ear, according to a study by the University of Rochester. These hairs are the first step in picking up on noises and are not naturally replaced when killed off by age or overexposure to loud noise.

Humans do not regenerate hair cells in the inner ear once they are lost, which leads to permanent hearing damage. These hair cells move in response to vibrations, which causes nerve impulses to be sent to the brain where they are interpreted as sounds. In other animals, however, such as birds, frogs and fish, surrounding cells in the inner ear, known as the cochlea, can change into hair cells. Although unclear exactly how this occurs, it is thought to be driven by protein signalling. 

Hearing loss can be temporary or permanent. It can also develop gradually with age or come on suddenly. Hearing loss in just one ear may be due to a build-up of wax, an infection or a burst eardrum. Sudden loss in both ears may be due to damage from a very loud noise or side effects of certain medication. A gradual hearing loss may be the result of fluid building up, known as glue ear; a bony growth, called otosclerosis; or skin cell accumulation, known as cholesteatoma. A gradual hearing loss in both ears is usually caused by ageing or exposure to loud noises over many years. Hearing loss sometimes gets better on its own. 

A build-up of wax can also be treated by being suctioned out or softened with drops. However, hearing loss can also be permanent, with treatment then focusing on making the most of the hearing that remains. This may involve: Hearing aids Implants - attach to the skull or are placed deep in the ear if hearing aids are ineffective Communicating via sign language or lip reading Hearing loss can be prevented by avoiding loud music and wearing headphones that block out background noise. Ear defenders should also be worn if you work in a noisy environment, such as a building site. And ear protection should be worn at concerts and other noisy events. 

Source: NHS Choices The researchers analysed the effects of one of these proteins, known as ERBB2, in the hair cells of newborn mice. 

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