( Some of the leading causes of death among the elderly are a number of chronic conditions associated with persistent low-grade inflammation in which IL-1? has a central role. One of the paths by which low-grade inflammation contributes to aging-associated diseases is by interfering with the ability of the host to maintain homeostasis. The experiments from the previous funding period provided evidence for a novel pathway by which inflammation may deteriorate a major regulatory mechanism. Specifically, we found that IL-1? increases the levels of glucocorticoid receptor, an effect especially potent in aged animals, leading to an augmented response to glucocorticoids. This proposal investigates the mechanisms and impact of IL-1? control of glucocorticoid -dependent functions in the elderly. The proposed studies will do that in the context of fatty liver, a condition of paramount health importance for public health, which is frequent in the elderly and, in some cases, may progress to non-alcoholic fatty liver disease.
In aim 1, a series of in vitro studies will identify the mechanisms for IL-1?-induced increases in GR levels and delineate some of the functional consequences in hepatocytes. A candidate approach paralleled by an unbiased genome wide analyses using ChipSeq and mRNA arrays will determine the degree of IL-1? impact on GR-dependent transcriptional regulation of gene expression in the liver.
Specific aim 2 is dedicated to investigating the impact IL-1? has on GR responses in vivo using a diet-induced mouse model of steatosis and metabolic syndrome. The magnitude of IL-1? response in hepatocytes will be modulated in vivo or in vitro by targeting a key component of its signaling cascade, nSMase2. The consequences on lipogenesis, gluconeogenesis and insulin sensitivity will be main readouts. Glucocorticoid hypersensitivity underlies many aging-associated disease. The chronic used of glucocorticoids for the treatment of inflammation is associated with significant side effects, particularly in the elderly. Therefore, by uncovering the mechanisms that regulate glucocorticoid response in the liver during aging, the proposed studies have the potential to discover both basic mechanisms of aging, as well as novel approaches to manage unwanted side effects of chronic use of glucocorticoids.

Public Health Relevance

Some of the leading causes of death among the elderly are a number of chronic conditions associated with persistent low-grade inflammation. Uncovering new, aging-specific factors that influence the onset of inflammation is of uttermost significance for the over health and medical treatment of the elderly. The proposed studies are concentrated on steatosis, the hepatic manifestation of metabolic syndrome, which is a common disease of the aged.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG019223-14
Application #
9939366
Study Section
Cellular Mechanisms in Aging and Development Study Section (CMAD)
Program Officer
Guo, Max
Project Start
2002-08-01
Project End
2023-05-31
Budget Start
2020-06-01
Budget End
2021-05-31
Support Year
14
Fiscal Year
2020
Total Cost
Indirect Cost
Name
University of Kentucky
Department
Physiology
Type
Schools of Medicine
DUNS #
939017877
City
Lexington
State
KY
Country
United States
Zip Code
40526
Hanaoka, Beatriz Y; Ormseth, Michelle J; Michael Stein, C et al. (2018) Secretory sphingomyelinase (S-SMase) activity is elevated in patients with rheumatoid arthritis. Clin Rheumatol 37:1395-1399
Deevska, Gergana M; Dotson 2nd, Patrick P; Karakashian, Alexander A et al. (2017) Novel Interconnections in Lipid Metabolism Revealed by Overexpression of Sphingomyelin Synthase-1. J Biol Chem 292:5110-5122
Nolan, Michael W; Gieger, Tracy L; Karakashian, Alexander A et al. (2017) Outcomes of Spatially Fractionated Radiotherapy (GRID) for Bulky Soft Tissue Sarcomas in a Large Animal Model. Technol Cancer Res Treat 16:357-365
Shi, L; Banerjee, D; Dobierzewska, A et al. (2016) Direct regulation of IGF-binding protein 1 promoter by interleukin-1? via an insulin- and FoxO-1-independent mechanism. Am J Physiol Endocrinol Metab 310:E612-E623
Zhang, L P; Kline 4th, R H; Deevska, G et al. (2015) Alcohol and high fat induced chronic pancreatitis: TRPV4 antagonist reduces hypersensitivity. Neuroscience 311:166-79
Dotson 2nd, P Patrick; Karakashian, Alexander A; Nikolova-Karakashian, Mariana N (2015) Neutral sphingomyelinase-2 is a redox sensitive enzyme: role of catalytic cysteine residues in regulation of enzymatic activity through changes in oligomeric state. Biochem J 465:371-82
Empinado, Hyacinth M; Deevska, Gergana M; Nikolova-Karakashian, Mariana et al. (2014) Diaphragm dysfunction in heart failure is accompanied by increases in neutral sphingomyelinase activity and ceramide content. Eur J Heart Fail 16:519-25
Moylan, Jennifer S; Smith, Jeffrey D; Wolf Horrell, Erin M et al. (2014) Neutral sphingomyelinase-3 mediates TNF-stimulated oxidant activity in skeletal muscle. Redox Biol 2:910-20
Momchilova, Albena; Petkova, Diana; Staneva, Galya et al. (2014) Resveratrol alters the lipid composition, metabolism and peroxide level in senescent rat hepatocytes. Chem Biol Interact 207:74-80
Deevska, Gergana; Sunkara, Manjula; Karakashian, Claudia et al. (2014) Effect of procysteine on aging-associated changes in hepatic GSH and SMase: evidence for transcriptional regulation of smpd3. J Lipid Res 55:2041-52

Showing the most recent 10 out of 25 publications