Navigation Links
Retinal cells thoughts to be the same are not, JHU biologist says
Date:7/25/2011

The old adage "Looks can be deceiving" certainly rings true when it comes to people. But it is also accurate when describing special light-sensing cells in the eye, according to a Johns Hopkins University biologist.

In a study recently published in Nature, a team led by Samer Hattar of the Department of Biology at the Krieger School of Arts and Sciences and Tudor Badea at the National Eye Institute found that these cells, which were thought to be identical and responsible for both setting the body's circadian rhythm and the pupil's reaction to light and darkness, are actually two different cells, each responsible for one of those tasks.

"In biology, as in life, you can't always trust what you see," said Hattar. "You have to delve deep to find out what's really going on. This study has shown that two structurally similar neurons are actually quite different and distinct, communicate with different regions of the brain and influence different visual functions."

The findings are significant, Hattar said, because doctors sometimes use pupillary light reflex (the pupil's response to light and darkness) as a way of diagnosing patients who may have sleep problems, and those clinicians now must recognize that the cells controlling pupillary response and those controlling the sleep-wake cycle are different.

"Although the diagnosis may still be valid most of the time, it is important to remember that disrupted pupillary light response with normal sleep wake cycles or the opposite is possible, and caution should be exercised if clinicians only use pupillary light reflex for diagnosis purposes for deficits in non-image forming visual functions," explained Shih-Kuo (Alen) Chen, a post-doctoral fellow in the Department of Biology and co-author of the Nature article.

Hattar's research focuses on these special light-sensitive cells and how they regulate the physiology and behavior of mammals.

"In human be
'/>"/>

Contact: Lisa DeNike
Lde@jhu.edu
443-287-9960
Johns Hopkins University
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Novel pathway regulating angiogenesis may fight retinal disease, cancers
2. Researchers develop curious snapshot of powerful retinal pigment and its partners
3. Scientists show Six3 gene essential for retinal development
4. Blind mice can see thanks to special retinal cells
5. New strategy develops 2 prototype drugs against cancer, retinal diseases
6. All eyes on retinal degeneration
7. Eye cells believed to be retinal stem cells are misidentified
8. Progression of retinal disease linked to cell starvation
9. Gene therapy restores vision to mice with retinal degeneration
10. Universal donor immune cells
11. UCLA scientists complete first mapping of molecule found in human embryonic stem cells
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Retinal cells thoughts to be the same are not, JHU biologist says
(Date:9/2/2014)... through a U.S. suburb , Observations and mapping ... the hours and days after the August 24 earthquake ... earthquake caused so much damage in the region, according ... by the American Geophysical Union. , ... Places to Direct Our Curiosity , Selecting where ...
(Date:9/2/2014)... The Field Museum will present the prestigious Parker/Gentry Award ... commitment to biodiversity conservation awareness. The Parker/Gentry Award is ... individual, team or organization whose efforts have had a ... and whose actions can serve as a model to ... an environmental science and conservation news website that draws ...
(Date:9/2/2014)... In Bavaria, the Tithonian Konservat-Lagersttte of lithographic limestone ... discoveries of emblematic fossils from that area (for ... have found fossil insects in the French equivalent ... new species representing the oldest known water treader. ... equivalent Bavarian outcrops, fewer fossils have been obtained ...
Breaking Biology News(10 mins):This week From AGU: California earthquake, future Mars rovers, models underestimate ozone 2Exceptionally well preserved insect fossils from the Rhône Valley 2
... marine animals find their way back to their birthplace to ... has mystified scientists for more than a century. But marine ... think they might finally have unraveled the secret. At ... read the magnetic field of their home area and "imprint" ...
... from the California Institute of Technology (Caltech) have created ... the first time, the connection between the configuration of ... More precisely, they showed that the muscular band--which ... a helix--is actually a sort of twisting highway along ...
... (ST. LOUIS): The Missouri Botanical Garden Press (MBG ... species of vascular plants for the Southern Cone region, ... Plantas Vasculares del Cono Sur (Catalogue of the Plants ... the plants of Argentina, southern Brazil, Chile, Paraguay and ...
Cached Biology News:No place like home: New theory for how salmon, sea turtles find their birthplace 2No place like home: New theory for how salmon, sea turtles find their birthplace 3Caltech scientists show function of helical band in heart 2Missouri Botanical Garden publishes first catalogue of plants of the Southern Cone 2
(Date:9/2/2014)... 2014 Myriant Corporation, a global ... a distribution agreement with Azelis Group, a specialty ... bio-succinic acid in the Nordics, Benelux, France, Iberia, ... in the industrial and base chemicals markets. , ... a far-reaching chemical portfolio with extensive distribution networks ...
(Date:9/2/2014)... 2, 2014 /PRNewswire/ - Oncothyreon Inc. (Nasdaq: ONTY ) ... Chief Executive Officer, will present at the Rodman & Renshaw ... New York on Tuesday, Sept. 9, 2014 at ... webcast of the presentation will be accessible by visiting the ... section. About Oncothyreon Oncothyreon ...
(Date:9/2/2014)... -- Spherix Incorporated (SPEX) -- an intellectual property development company committed to ... that the United States Patent & Trademark Office (USPTO) ... of August that are part of a standard essential ... are: , U.S.RE45,065 issued August 5, ... , U.S.RE45,095 issued August 26, 2014.  ...
(Date:9/1/2014)... The global oligonucleotide synthesis market is ... $1,070.7 million in 2014, growing at a CAGR ... oligonucleotide synthesis market is categorized on the basis ... geography. The synthesized oligonucleotides segment is expected to ... synthesis market during the forecast period, owing to ...
Breaking Biology Technology:Myriant and Azelis Sign European Distribution Agreement for Bio-Succinic Acid 2United States Patent & Trademark Office Issues Three New Standard Essential Patents to Spherix 29.8% CAGR for Oligonucleotide Synthesis Market Globally to 2019 Says a New Research Report Available at RnRMarketResearch.com 29.8% CAGR for Oligonucleotide Synthesis Market Globally to 2019 Says a New Research Report Available at RnRMarketResearch.com 39.8% CAGR for Oligonucleotide Synthesis Market Globally to 2019 Says a New Research Report Available at RnRMarketResearch.com 49.8% CAGR for Oligonucleotide Synthesis Market Globally to 2019 Says a New Research Report Available at RnRMarketResearch.com 5
... expansion of PROVENT(R) Sleep Apnea Therapy in Limited ... Inc. a privately-held, medical device company, focused on ... the appointment of John McCutcheon as President and ... company also announced that current CEO Jeffrey Nugent ...
... Group (OTC Bulletin Board: SNBP) is pleased to ... Director of Marketing.Ms. Tan joins Sinobiopharma from Organon ... China-based Unit Marketing Director for Organon, which was ... Tan held senior marketing management roles at China ...
... Kiadis,Pharma reported preliminary clinical data on ATIR(TM) ... Data was presented by the,company,s principal investigator ... Symposium at the Annual European Bone Marrow ... March 30, 2009. Only the 6,highest ranked ...
Cached Biology Technology:Ventus Medical Appoints John McCutcheon as President and CEO 2Sinobiopharma, Inc. Appoints New Director of Marketing 2Kiadis Pharma Reports ATIR(TM) Clinical Data, Further Supporting its Potential in Mismatched Bone Marrow Transplantations 2
... label transfer is fast emerging as a ... and confirmation. Until now, only amino groups ... label transfer reagents such as our Sulfo-SBED. ... Mts-Atf-LC-Biotin, are exciting additions to the protein ...
... siRNA --- a cocktail of 3 siRNAs ... interestis our most popular product. The siTrio ... knockdown of your target gene when used ... transfection and confirmation of optimal transfection with ...
... transfer is fast emerging as a powerful ... confirmation. Until now, only amino groups have ... transfer reagents such as our Sulfo-SBED. Sulfhydryl-reactive ... are exciting additions to the protein interaction ...
... siTrio siRNA --- a cocktail of 3 ... of interestis our most popular product. The ... 75% knockdown of your target gene when ... for transfection and confirmation of optimal transfection ...
Biology Products: