HOME >> BIOLOGY >> NEWS
Extreme stretch-growth of axons

"

These extreme rates of growth are not consistent with the current understanding of the limitations of axon growth. "Proteins necessary to sustain this growth are somehow correctly brought to sites along the axon faster than conceivable rates of transport," notes Smith. The team suggests two possible mechanisms to explain this: increasing transport to a very fast rate or making the necessary proteins at the site, proximal to the growing axons. Smith believes that this form of growth commonly occurs in nature. "For example, it can be inferred that axons in a blue whale's spine grow more than three centimeters a day and in a giraffe's neck at two centimeters a day at peak growth."

The team also found that they had to condition the axons to grow in an extreme way. "Although they can handle enormous growth, you can't just spring it on them," explains Bryan Pfister, PhD a post-doctoral fellow in Smith's lab and coauthor of the study. "If we ramp up the stretch rate too fast, the axons will snap." From this the team surmises that in nature animals must grow at a metered pace, which allows for constant feedback and conditioning.

It has been well established that axons initially grow out from neurons and follow a chemical stimulus to connect with another neuron. However, once the axon has reached its target a relatively unknown form of stretch-growth must ensue as the animal grows. Mechanical changes in the growing brain, spine, and other bones are the starting point for natural stretch-growth in axons. "We know that it's not tension on the neuron itself, but tension on the axon," says Smith. "It's deformation, a pulling on the axon." At this point, it is unclear what receptors and cell signaling pathways are involved to get the process started, but from this and previous studies the investigators do report that the signal is from a mechanical stimulus along the length of the axon as opposed to a chemical stimulus. "The stretch is coming from
'"/>

Contact: Karen Kreeger
karen.kreeger@uphs.upenn.edu
215-349-5658
University of Pennsylvania School of Medicine
7-Sep-2004


Page: 1 2 3

Related biology news :

1. Extreme 2003 takes students worldwide to the oceans depth
2. Extreme climate variance sped extinction of local butterfly populations, researchers say
3. For First Time In 40 Years National Jewish Researchers Report Chronic Beryllium Disease Caused By Extremely Low Levels Of Exposure
4. The Fire Down Below: Extreme Heat-Loving Organisms May Be Keys To Molecular Evolution, Origin Of Life, New Book Argues
5. Virginia Tech Scientists Studying Cells From Extreme Environments
6. Plakin proteins brace nerve axons and allow for the transport of neurotransmitter vesicles

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/14/2016)... SARASOTA, Fla., Nov. 14, 2016  xG Technology, Inc. ... in providing critical wireless communications for use in challenging ... ended September 30, 2016. Management will hold a conference ... at 5:00 p.m. Eastern Time (details below). ... announced a $16 million binding agreement to acquire Vislink ...
(Date:6/27/2016)... -- Research and Markets has announced the addition of ... their offering. The report forecasts ... grow at a CAGR of 12.28% during the period 2016-2020. ... market analysis with inputs from industry experts. The report covers the ... report also includes a discussion of the key vendors operating in ...
(Date:6/22/2016)... , June 22, 2016   ... management and verification solutions, has partnered with ... software solutions for Visitor Management, Self-Service Kiosks ... provides products that add functional enhancements to ... provides corporations and venues with an automated ...
Breaking Biology News(10 mins):
(Date:12/2/2016)... PA (PRWEB) , ... December 01, 2016 , ... ... through industry-wide collaboration, standardization and a beautiful technology experience. All three tenets were on ... than 100 clinical trial leaders from over 40 sponsor, CRO and site organizations to ...
(Date:12/2/2016)...   SurePure, Inc. (OTCQB: SURP) a global ... has concluded an agreement with Tamarack Biotics under which ... to acquire units of the Company,s patented photopurification technology ... Concurrently with the option, SurePure has ... will seek regulatory approvals in the United ...
(Date:11/30/2016)... , Nov. 30, 2016  GenomOncology today announced the appointment ... of Medical Affairs.  Dr. Coleman will oversee ... company,s proprietary knowledge-enabled platform. The GenomOncology software suite empowers molecular ... sequencing data and clinical decision support, from quality control through ... , , ...
(Date:11/30/2016)... -- The Allen Institute for Cell Science has released ... collection of gene edited, fluorescently tagged human induced ... with unprecedented clarity. Distributed through the Coriell Institute ... crucial first step toward visualizing the dynamic organization ... cells healthy and what goes wrong in disease. ...
Breaking Biology Technology:
Cached News: