Sreejayan Nair, Ph.D.

Associate Professor of Pharmacology

Director, Biomedical Sciences PhD Program

Director, Center for Cardiovascular Research and Alternative Medicine (C-CRAM)

sreejay@uwyo.edu • (307) 766-6138 • HS 484

Best Mode of Communication: E-mail

Curriculum Vitae

Education:

B. Pharm. 1989, College of Pharmaceutical Sciences, Manipal, Mangalore University, India 

M. Pharm. 1991, College of Pharmaceutical Sciences, Manipal, Mangalore University, India 

Ph.D. 1996, College of Pharmaceutical Sciences, Manipal, Mangalore University, India

Professional experience:

2008-present- Associate Professor, University of Wyoming, School of Pharmacy, Laramie, Wyoming

2002-2008- Assistant Professor, University of Wyoming, School of Pharmacy, Laramie, Wyoming

1998-2002- Post Doctoral Fellow, Department of Physiology, University of Tennessee, Memphis, Tennessee

1996-1998-Research Fellow, Department of Medicine II, Klinikum Grosshadern, Ludwig Maximillians University, Munich, Germany

Research:

Type-2 diabetes is an emerging health problem. Targeting, insulin resistance, which occurs long before the onset of frank type-2 diabetes is an attractive strategy to preempt diabetes and its complication. Our lab is interested in understanding the molecular mechanisms leading to insulin resistance. Our ultimate goal is to design and develop novel therapeutic strategies to prevent or treat this condition. We use the general techniques of cell biology such as tissue culture, Western blotting, immunoprecipitation, immunocytochemistry and the techniques of molecular biology, including the use of adenoviral vectors for transgene expression and knock-out animals to address our research questions. Outcome of our studies will help in understanding the mechanisms involved in the pathogenesis of diabetes and may aid in developing novel therapeutic strategies to treat or prevent these conditions. We have characterized novel low molecular-weight chromium complexes that can alleviate insulin resistance by augmenting insulin signaling both in cultured myotubes and in genetic and nutritional animal models of insulin resistance. In addition to insulin resistance, we are also interested in cardiac complications associated with insulin resistance. Our recent studies have unraveled roles cathepsin K and endothelin-receptor-A in obesity associated cardiometabolic dysfunctions.

Research Interests:

Type-2 diabetes and cardiovascular diseases

Teaching:

Pharmacology, Clinical Toxicology, Advanced Cardiovascular Physiology, Molecular and Cellular Basis for Diseases

Publications:

Refereed Journal Articles

Hua H, Clark S, Ren J, Sreejayan N. (2012) Molecular mechanisms of chromium in alleviating insulin resistance. J.  Nutr. Biochem 23: 313-319

Palanichamy K, Sreejayan N, Ontko A (2011) Overcoming cisplatin resistance using gold(III) mimics: Anticancer activity of novel gold(III) polypyridyl complexes. J Inorg Biochem. 106: 32-42

Ceylan-Isik AF, Sreejayan N, Ren J.: Endoplasmic reticulum chaperon tauroursodeoxycholic acid alleviates obesity-induced myocardial contractile dysfunction J. Mol. Cell Cardiol. 50, 2011, 107-16

Kandadi MR, Unnikrishnan MK, Warrier AK, Du M, Ren J, Sreejayan N: Chromium (d-phenylalanine)3 alleviates high fat-induced insulin resistance and lipid abnormalities. J Inorg Biochem, 105, 58-62, 2010

Sreejayan N, Marone PA, Lau FC, Yasmin T, Bagchi M, Bagchi D: Safety and toxicological evaluation of a novel chromium(III) dinicocysteinate complex. Toxicol Mech Methods, 20, 321-33, 2010

Zhao J, Yue W, Zhu MJ, Sreejayan N, Du M: AMP-activated protein kinase (AMPK) cross-talks with canonical Wnt signaling via phosphorylation of β-catenin at Ser 552. Biochem. Biophys. Res. Commun. 395: 146-151, 2010

Hua Y, Kandadi MR, Zhu M, Ren J, Sreejayan N: Tauroursodeoxycholic Acid Attenuates Lipid Accumulation in Endoplasmic Reticulum-Stressed Macrophages. J Cardiovasc Pharmacol, 55: 49-55, 2010

Kandadi MR, Rajanna PK, Unnikrishnan MK, Boddu SP, Hau Y, Li J, Du M, Ren J, Sreejayan N: 2-(3,4-Dihydro-2H-pyrrolium-1-yl)-3oxoindan-1-olate (DHPO), a novel, synthetic small molecule that alleviates insulin resistance and lipid abnormalities. Biochem Pharmacol. 79: 623-31, 2010

Zhao P, Wang J, Ma H, Xiao Y, He L, Tong C, Wang Z, Zheng Q, Dolence EK, Sreejayan N, Ren J, Li J: A newly synthetic chromium complex-chromium (D-phenylalanine)3 activates AMP-activated protein kinase and stimulates glucose transport. Biochem Pharmacol 77:1002-1010, 2009

Dong F, Hua Y, Zhao P, Ren J, Du M, Sreejayan N: Chromium Supplement Inhibits Skeletal Muscle Atrophy in Hindlimb Suspended Mice. J Nutr Biochem 12: 992-999, 2009

Sreejayan N, Yang X, Palanichamy K, Dolence K, Ren J: Antioxidant properties of argpyrimidine. Eur J Pharmacol 593:30-35, 2008

Sreejayan N, Dong F, Kandadi MR, Yang XP, Ren J: Chromium alleviates glucose intolerance, insulin resistance, and hepatic ER stress in obese mice. Obesity 16:1331-1337, 2008

Ren J, Duan JH, Thomas DP, Yang XP, Sreejayan N, Sowers JR, Leri A, Kajstura J, Gao F, Anversa P: IGF-I alleviates diabetes-induced RhoA activation, eNOS uncoupling, and myocardial dysfunction. Am J Physiol -Reg Integr Comp Physiol 94: R793-R802, 2008

Liu Y, Dolence J, Ren J, Rao M, Sreejayan N: Inhibitory effect of dehydrozingerone on vascular smooth muscle cell function. J Cardiovasc Pharmacol 52: 422-429, 2008

Jungst C, Sreejayan N, Zundt B, Muller I, Spelsberg FW, Huttl TP, Kullak-Ublick GA, del Pozo R, Jungst D, von Ritter C: Ursodeoxycholic acid reduces lipid peroxidation and mucin secretagogue activity in gallbladder bile of patients with cholesterol gallstones. Eur J Clin Invest 38:634-639, 2008

Dong F, Kandadi MR, Ren J, Sreejayan N: Chromium (D-phenylalanine)3 supplementation alters glucose disposal, insulin signaling, and glucose transporter-4 membrane translocation in insulin-resistant mice. J Nutr 138:1846-1851, 2008

Dong F, Hua Y, Zhao P, Ren J, Du M, Sreejayan N: Chromium supplement inhibits skeletal muscle atrophy in hindlimb-suspended mice. J Nutr Biochem, 2008

Stratton MS, Yang X, Sreejayan N, Ren J: Impact of insulin-like growth factor-I on migration, proliferation and Akt-ERK signaling in early and late-passages of vascular smooth muscle cells. Cardiovasc Toxicol 7:273-281, 2007

Sreejayan N, Yang X: Isolation and functional studies of rat aortic smooth muscle cells. Methods Mol Med 139:283-292, 2007

Li Q, Yang X, Sreejayan N, Ren J: Insulin-like growth factor I deficiency prolongs survival and antagonizes paraquat-induced cardiomyocyte dysfunction: role of oxidative stress. Rejuvenation Res 10:501-512, 2007

Jungst C, Sreejayan N, Eder MI, von Stillfried N, Zundt B, Spelsberg FW, Kullak-Ublick GA, Jungst D, von Ritter C: Lipid peroxidation and mucin secretagogue activity in bile of gallstone patients. Eur J Clin Invest 37:731-736, 2007

Fang CX, Yang XP, Sreejayan N, Ren J: Acetaldehyde promotes rapamycin-dependent activation of p70(S6K) and glucose uptake despite inhibition of Akt and mTOR in dopaminergic SH-SY5Y human neuroblastoma cells. Exp Neruol 203:196-204, 2007

Dong F, Yang XP, Sreejayan N, Ren J: Chromium(D-phenylalanine)3 improves obesity-induced cardiac contractile defect in ob/ob mice. Obesity 15:2699-2711, 2007

Dong F, Li Q, Sreejayan N, Nunn JM, Ren J: Metallothionein prevents high-fat diet induced cardiac contractile dysfunction: role of peroxisome proliferator activated receptor gamma coactivator 1alpha and mitochondrial biogenesis. Diabetes 56:2201-2212, 2007

Yang XP, Thomas DP, Zhang XC, Culver BW, Alexander BM, Murdoch WJ, Rao MNA, Tulis DA, Ren J, Sreejayan N: Curcumin inhibits platelet-derived growth factor-stimulated vascular smooth muscle cell function and injury-induced neointima formation. Arterioscler Thromb Vasc Biol 26:85-90, 2006

Yang XP, Li SY, Dong F, Ren J, Sreejayan N: Insulin-sensitizing and cholesterol-lowering effects of chromium (D-Phenylalanine)(3). J Inorg Biochem 100:1187-1193, 2006

Yang X, Doser TA, Fang CX, Nunn JM, Janardhanan R, Zhu M, Sreejayan N, Quinn MT, Ren J: Metallothionein prolongs survival and antagonizes senescence-associated cardiomyocyte diastolic dysfunction: role of oxidative stress. FASEB J 20:1024-1026, 2006

Wold LE, Ceylan-Isik AF, Fang CX, Yang XP, Li SY, Sreejayan N, Privratsky JR, Ren J: Metallothionein alleviates cardiac dysfunction in streptozotocin-induced diabetes: Role of Ca2+ cycling proteins, NADPH oxidase, poly(ADP-Ribose) polymerase and myosin heavy chain isozyme. Free Rad Biol Med 40:1419-1429, 2006

Li SY, Yang X, Ceylan-Isik AF, Du M, Sreejayan N, Ren J: Cardiac contractile dysfunction in Lep/Lep obesity is accompanied by NADPH oxidase activation, oxidative modification of sarco(endo)plasmic reticulum Ca2+-ATPase and myosin heavy chain isozyme switch. Diabetologia 49:1434-1446, 2006

Fang CX, Doser TA, Yang X, Sreejayan N, Ren J: Metallothionein antagonizes aging-induced cardiac contractile dysfunction: role of PTP1B, insulin receptor tyrosine phosphorylation and Akt. Aging Cell 5:177-185, 2006

Yang XP, Zhu MJ, Sreejayan N, Ren J, Du M: Angiotensin II promotes smooth muscle cell proliferation and migration through release of heparin-binding epidermal growth factor and activation of EGF-receptor pathway. Mol Cells 20:263-270, 2005

Yang XP, Sreejayan N, Ren J: Views from within and beyond - Narratives of cardiac contractile dysfunction under senescence. Endocrine 26:127-137, 2005

Yang XP, Palanichamy K, Ontko AC, Rao MNA, Fang CX, Ren J, Sreejayan N: A newly synthetic chromium complex - chromium (phenylalanine)3 improves insulin responsiveness and reduces whole body glucose tolerance. FEBS Letts 579:1458-1464, 2005

Li SY, Du M, Dolence EK, Fang CX, Mayer GE, Ceylan-Isik AF, LaCour KH, Yang X, Wilbert CJ, Sreejayan N, Ren J: Aging induces cardiac diastolic dysfunction, oxidative stress, accumulation of advanced glycation endproducts and protein modification. Aging Cell 4:57-64, 2005

Yigzaw Y, Poppleton HM, Sreejayan N, Hassid A, Patel TB: Protein-tyrosine phosphatase-1B (PTP1B) mediates the anti-migratory actions of sprouty. J Biol Chem 278:284-288, 2003

Sreejayan N, Lin Y, Hassid A: NO attenuates insulin signaling and motility in aortic smooth muscle cells via protein tyrosine phosphatase 1B-mediated mechanism. Arterioscler Thromb  Vasc Biol 22:1086-1092, 2002

Chang Y, Ceacareanu B, Dixit M, Sreejayan N, Hassid A: Nitric oxide-induced motility in aortic smooth muscle cells: role of protein tyrosine phosphatase SHP-2 and GTP-binding protein Rho. Circ Res 91:390-397, 2002

Sreejayan N, Wittig BM, von Stillfried N, Hennicke MS, Meyer G, Stieber P, Lamerz R, von Ritter C: Human biliary mucin binds to E-selectin: a possible role in modulation of inflammation. Am J Physiol Gastrointest Liver Physiol 280:G1043-1048, 2001

Wildhirt SM, Schulze C, Conrad N, Sreejayan N, Reichenspurner H, von Ritter C, Reichart B: Reduced myocardial cellular damage and lipid peroxidation in off-pump versus conventional coronary artery bypass grafting. Eur J Med Res 5:222-228, 2000

Sreejayan N, von Ritter C: Lipid peroxidation in bile: Role of bile acids and the effect on biliary epithelial cell function. Pathophysiol 5 225-232, 1999

Ganesh Pai C, Sreejayan N, Rao MN: Evidence for oxidant stress in chronic pancreatitis. Ind J Gastroenterol 18:156-157, 1999

Sreejayan N, von Ritter C: Effect of bile acids on lipid peroxidation: The role of iron. Free Rad Biol  Med 25:50-56, 1998

Sreejayan N, Rao MNA, Priyadarsini KI, Devasagayam TPA: Inhibition of radiation-induced lipid peroxidation by curcumin. Int J Pharm 151:127-130, 1997

Sreejayan, Rao MNA: Nitric oxide scavenging by curcuminoids. J Pharm Pharmacol 49:105-107, 1997

Guha SN, Priyadarsini KI, Devasagayam TPA, Sreejayan N, Rao MNA: Hydroxyl radical reactions of (4-hydroxy, 3-methoxy-5-bromophenyl) pentenone, a curcuminoid antioxidant. Rad  Phy Chem 49:43-46, 1997

Sreejayan N, Rao MNA: Free radical scavenging activity of curcuminoids. Arzneimittel-Forschung/Drug Res 46:169-171, 1996

Subramanian M, Sreejayan N, Rao MNA, Devasagayam TPA, Singh BB: Diminution of Singlet Oxygen-Induced DNA-Damage by Curcumin and Related Antioxidants. Mutat Res 311:249-255, 1994

Sreejayan N, Rao MNA: Curcuminoids as Potent Inhibitors of Lipid-Peroxidation. J Pharm Pharmacol  46:1013-1016, 1994

Sreejayan N, Rao MNA: Curcumin Inhibits Iron-Dependent Lipid-Peroxidation. Int J Pharm 100:93-97, 1993

Sreejayan N, Rao MNA: Oxygen free radical scavenging by Momordica charantia extract. Fitoterapia LXII:344-346, 1991