NDLI: Type 3 deiodinase, a thyroid-hormone inactivating enzyme, controls survival and maturation of cone photoreceptors

Content Provider	PubMed Central
Author	Ng, Lily Lyubarsky, Arkady Nikonov, Sergei S. Ma, Michelle Srinivas, Maya Kefas, Benjamin Stgermain, Donald L. Hernandez, Arturo Pugh, Edward N. Forrest, Douglas
Abstract	Maturation of the mammalian nervous system requires adequate provision of thyroid hormone and mechanisms that enhance tissue responses to the hormone. Here, we report that the development of cones, the photoreceptors for daylight and color vision, requires protection from thyroid hormone by type 3 deiodinase, a thyroid hormone-inactivating enzyme. Type 3 deiodinase, encoded by Dio3, is expressed in the immature mouse retina. In Dio3 −/− mice, ~80% of cones are lost through neonatal cell death. Cones that express opsin photopigments for response to both short (S) and medium-long (M) wavelength light are lost. Rod photoreceptors, which mediate dim light vision, remain largely intact. Excessive thyroid hormone in wild type pups also eliminates cones. Cone loss is mediated by cone-specific thyroid hormone receptor β2 (TRβ2) as deletion of TRβ2 rescues cones in Dio3 −/− mice. However, rescued cones respond to short but not longer wavelength light because TRβ2 under moderate hormonal stimulation normally induces M opsin and controls the patterning of M and S opsins over the retina. The results suggest that type 3 deiodinase limits hormonal exposure of the cone to levels that safeguard both cone survival and the patterning of opsins that is required for cone function.
Related Links	http://dx.doi.org/10.1523/jneurosci.5267-09.2010
Ending Page	3357
Page Count	11
Starting Page	3347
File Format	PDF
ISSN	02706474
e-ISSN	15292401
Journal	The Journal of neuroscience : the official journal of the Society for Neuroscience
Issue Number	9
Volume Number	30
Language	English
Publisher Date	2010-03-03
Access Restriction	Open
Subject Keyword	Neuroscience(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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