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Loco/RGS14 Signaling Pathway in Longevity

Award Number: R21AG042021
ORGANIZATION: NATIONAL INSTITUTE ON AGING
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 06/01/2013
PERIOD OF PERFORMANCE END DATE: 05/31/2015

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Loco/RGS14 Signaling Pathway in Longevity - DESCRIPTION (provided by applicant): Although several conserved signaling pathways such as TOR-S6K, AC-PKA-Ras/Raf/MAPkinase, and IGF-1 are known to regulate stress resistance and longevity in various organisms, the mechanism of how RGS (regulator of G-protein signaling) protein affects aging process through G-protein signaling pathway is not understood yet. Our preliminary data exhibited that 1) reduced expression of a RGS protein, Loco, resulted in a longer lifespan of flies with stronger resistances to stressors, higher MnSOD activity, and increased fat contents. 2) In contrast, overexpression of the loco gene shortened lifespan significantly with lower stress resistance and reduced fat contents, also indicating that its RGS domain is related to the regulation of longevity. 3) Interestingly, expressional changes of yeast RGS2 and rat RGS14, homologues of the fly Loco, also affected oxidative stress resistance and longevity in the respective species, suggesting that Loco/RGS14 signaling pathway is evolutionarily conserved in various organisms for the regulation of longevity. It is known that Loco inactivates inhibitory G¿i¿GTP protein which reduces activity of adenylate cyclase (AC) and RGS14 interacts with activated H-Ras and Raf-1 kinases, which subsequently inhibits ERK phosphorylation. The specific hypothesis for this research is that Loco/RGS14 protein regulates stress resistance and longevity as an activator in AC-cAMP-PKA pathway and/or as a molecular scaffold that sequesters active Ras and Raf from Ras¿GTP-Raf-MEK-ERK signaling pathway. Consistently, our preliminary data showed that down-regulation of Loco significantly diminishes cAMP amounts and increases p-ERK levels with higher resistance to the oxidative stress. In addition, proteomic iTRAQ and 2D-gel analyses using loco mutant and overexpression revealed that Loco signaling increases phosphorylation levels of Rpd3 protein (HDAC1, histone deacetylase 1). Reduced expression of Rpd3 protein is reported to extend lifespan in Drosophila. However, it is not characterized how Rpd3/HDAC1 activity is regulated for longevity mechanism. Based on our preliminary data, the specific aims are to examine I) if Loco protein regulates the Ras/Raf/MAPkinase signaling pathway through direct interaction between them, II) if Loco/RGS14 signaling modulates phosphorylation levels of Rpd3/HDAC1 protein in both of fruitfly and mammal, III) if phosphorylation level of HDAC1 protein determines stress resistance and lifespan with regulating subcellular localization and/or activity of HDAC1 protein. Our approaches will find how the Loco/RGS14 protein regulates longevity with new and/or known longevity signaling pathway(s). We believe that the information obtained from our studies will advance our general understanding of the mechanisms of eukaryotic aging process and help us find ways to cure or delay aging-related diseases such as Alzheimer's disease.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2018 ( Subtotal = $0 )
2018	2014	RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY	185 S ORANGE AVE	NEWARK	NJ	07103	ESSEX	USA	Aging Research	000	3	1/4/2018	NON-COMPETING CONTINUATION	$0
														Subtotal = $0

Issue Date FY: 2017 ( Subtotal = $0 )
2017	2014	RUTGERS, THE STATE UNIVERSITY OF NEW JERSEY	185 S ORANGE AVE	NEWARK	NJ	07103	ESSEX	USA	Aging Research	000	3	10/21/2016	NON-COMPETING CONTINUATION	$0
														Subtotal = $0

Issue Date FY: 2014 ( Subtotal = $198,849 )
2014	2014	Rutgers, The State Univ Biomedical & Health Sciences	65 Davidson Road	Piscataway	NJ	08854	MIDDLESEX	USA	Aging Research	002	3	7/14/2014	NON-COMPETING CONTINUATION	$198,750
2014	2013	Rutgers, The State Univ Biomedical & Health Sciences	65 Davidson Road	Piscataway	NJ	08854	MIDDLESEX	USA	Aging Research	000	2	3/10/2014	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	-$4,087
2014	2013	UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY	POST OFFICE BOX 2100	NEW BRUNSWICK	NJ	08903	MIDDLESEX	USA	Aging Research	001	1	3/11/2014	NEW	$4,186
														Subtotal = $198,849

Issue Date FY: 2013 ( Subtotal = $238,474 )
2013	2013	UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY	POST OFFICE BOX 2100	NEW BRUNSWICK	NJ	08903	MIDDLESEX	USA	Aging Research	004	1	3/11/2014	NEW	$4,186
2013	2013	UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY	POST OFFICE BOX 2100	NEW BRUNSWICK	NJ	08903	MIDDLESEX	USA	Aging Research	001	1	8/23/2013	NEW	-$238,375
2013	2013	UNIVERSITY OF MEDICINE & DENTISTRY OF NEW JERSEY	POST OFFICE BOX 2100	NEW BRUNSWICK	NJ	08903	MIDDLESEX	USA	Aging Research	000	1	5/24/2013	NEW	$238,375
2013	2013	Rutgers, The State Univ Biomedical & HEALTH Sciences	65 Davidson Road	Piscataway	NJ	08554		USA	Aging Research	003	2	3/10/2014	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	-$4,087
2013	2013	Rutgers, The State Univ Biomedical & HEALTH Sciences	65 Davidson Road	Piscataway	NJ	08554		USA	Aging Research	002	2	8/26/2013	CHANGE OF GRANTEE / TRAINING INSTITUTION / AWARDING INSTITUTION	$238,375
														Subtotal = $238,474

Grand Total All Awards = $437,323

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Loco/RGS14 Signaling Pathway in Longevity

Award Number: R21AG042021

ORGANIZATION: NATIONAL INSTITUTE ON AGING

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 06/01/2013

PERIOD OF PERFORMANCE END DATE: 05/31/2015

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