Navigation Links
Can you hear me now? How the inner ear's sensors are made
Date:12/1/2008

A UCLA study shows for the first time how microscopic crystals form sound and gravity sensors inside the inner ear. Located at the ends of cilia tiny cellular hairs in the ear that move and transmit signals these crystals play an important role in detecting sound, maintaining balance and regulating movement.

Dislodged ear crystals are to blame for the most common form of vertigo. Known as benign paroxysmal positional vertigo, the disorder plagues up to 10 percent of people older than 60 and causes 20 percent of patients' dizziness complaints.

The researchers' findings, published Nov. 30 in the advance online edition of the journal Nature, suggest a potential gene target for the treatment of people suffering from common hearing and balance problems related to cilia disorders.

"People have known for a long time about the importance of cilia for propelling sperm up the uterus and moving mucus out of the lungs," said Kent Hill, associate professor of microbiology, immunology and molecular genetics at the David Geffen School of Medicine at UCLA and the UCLA College of Letters and Science. "Our study illustrates that cilia perform many additional jobs that are essential to how our bodies develop and work."

Hill's team employed high-speed, high-definition video imaging to watch cilia moving in real-time inside the developing ears of embryonic zebrafish. These small, bony fish undergo stages of development similar to humans and other vertebrates, making them useful models for research.

The researchers labeled cilia in the fish with fluorescent probes and used video microscopy to visualize the cilia and other inner ear structures. In the control group of fish, long cilia beat like tiny oars, causing tiny particles to circle in a vortex around them. The tornado of whirling particles accumulated at the proper location to form the inner ear's crystalline sensors.

"We next blocked expression of a gene that controls dynein a tiny molecular motor that drives cilia movement," said Hill. "When we examined the embryos, we saw that cilia movement came to a halt. As a result, the particles did not assemble in the correct site. So not only did ear crystals form in the wrong place, but they were misshapen and abnormally sized."

"While it's been suggested that cilia movement contributes to the formation of ear crystals, this idea had never been tested before," he said. "Our findings show that cilia in the ear do move and demonstrate that cilia movement is needed for ear crystals to assemble in the right place."

According to Hill, the findings offer promise for the treatment of patients with hearing disorders and people with ciliopathies, disorders marked by poor cilia function. These conditions include sperm-related infertility, polycystic kidney disease, lung and respiratory disorders, swelling of the brain, and reversal of the internal organs' sites from one side of the body to the other.

"The idea that physical movement can influence vertebrate development is very provocative," Hill said. "Scientists typically look at whether a particular gene is switched on or off, or if a particular protein is activated that determines if a tissue develops normally. In this case, microscopic currents in the fluid surrounding developing tissue are affecting its development. We need to understand more details of this process and determine how common it is during development."


'/>"/>

Contact: Elaine Schmidt
eschmidt@mednet.ucla.edu
310-794-2272
University of California - Los Angeles
Source:Eurekalert

Related medicine news :

1. Wrinkle Cream Reviews Site Reveals a Winner for 2008's Best Wrinkle Creams : Wrinkle Cream reviewssite, WrinkleBest.com has released the Editor's Choice for Best Wrinkle Cream of 2008
2. Everything Channels Vision Events Announces the Winners of the Healthcare IT Innovation(TM) Awards
3. Innerscope Research Strengthens Management Team With Three Executive Appointments
4. Exstream Software by HP Announces 2008 Visionary Award Winners : Customers Showcase Innovative Applications Created using the HP Exstream Enterprise Document Automation Solution
5. Winners Announced in 2008 Collegiate Inventors Competition(R)
6. The Leukemia & Lymphoma Society Congratulates Cy Young Award Winner Cliff Lee
7. Homecoming Veterans Often Face Inner Challenge
8. Emmy Winner Jonathan Jackson With Rock Band Enation Take On Predators & Rapists
9. Bed Bugs on Thanksgiving Dinner Guest List
10. Written Instructions Cut Bleeding Risk for Blood Thinner Use
11. Philips Announces 2008 Winner of American Heart Association-Philips Resuscitation Fellowship Award
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... The Visiting Nurse Association ... Featuring a collection of specialty vendors and unique items from across the nation, this ... health and wellness services offered by the VNA. The boutique will be open ...
(Date:10/13/2017)... ... October 13, 2017 , ... Coveros, a leader ... been awarded a contract by the Center for Medicare and Medicaid Services (CMS). ... the enterprise use of Agile methodologies in a consistent and high value manner ...
(Date:10/12/2017)... ... October 12, 2017 , ... Planet Fitness, one of the largest and ... plans to open a flagship location in Covington, LA at 401 N. U.S. Highway ... store next to Office Depot in the Holiday Square shopping center. Its location allows ...
(Date:10/12/2017)... ... October 12, 2017 , ... Information about ... intend to develop to enable prevention of a major side effect of chemotherapy ... especially in pediatric patients. For cisplatin, hearing loss is FDA listed on-label as ...
(Date:10/12/2017)... Mich. (PRWEB) , ... October 12, 2017 , ... ... has been named one of Michigan’s 2017 Best and Brightest in Wellness® by ... Brightest in Wellness® awards program on Friday, Oct. 20 from 7:30 a.m. to ...
Breaking Medicine News(10 mins):
(Date:10/12/2017)... AVACEN Medical , Inc. (AVACEN) announced that ... New Product Innovation Award for Its fibromyalgia pain management ... medical device market research by Frost & Sullivan,s industry experts. ... pain relief product, the AVACEN 100, offers a safe and ... pain. ...
(Date:10/12/2017)... West Pharmaceutical Services, Inc. (NYSE: ... drug administration, today announced that it will release third-quarter ... October 26, 2017, and will follow with a conference ... 9:00 a.m. Eastern Time. To participate on the call, ... ID is 94093362. ...
(Date:10/11/2017)... , Oct. 11, 2017  Caris Life Sciences ® ... fulfilling the promise of precision medicine, today announced that ... Caris, Precision Oncology Alliance™ (POA) as its 17 th ... the St. Jude Crosson Cancer Institute will help develop ... use of tumor profiling, making cancer treatment more precise ...
Breaking Medicine Technology: