The purpose of this competitive renewal is to continue our ongoing investigation on the role of periostin on renal cyst enlargement and fibrosis in PKD and determine if integrin-linked kinase (ILK), a kinase regulated by periostin-binding to aV-integrins, is a pharmacological target for PKD. Periostin, previously named osteoblast- specific factor 2 (OSF-2), is a newly recognized member of matricellular proteins that also includes thrombospondins, osteopontin, ig-H3, SPARC and connective tissue growth factors. Periostin is expressed in tissues involved in mechanical stress conditions, such as the periodontal ligaments, periosteum and cardiac valves and is secreted into the extracellular matrix (ECM) following acute injury to the heart, skin and other tissues. It directly interacts wit components of the ECM, including collagen and fibronectin, and promotes collagen fibrillogenesis to maintain tissue integrity. Aberrant expression of periostin is associated with fibrosis and tumor growth through activation of pathways involved in cell proliferation, survival and tissue angiogenesis. Periostin is not normally expressed in adult kidney. Our laboratory discovered that periostin was one of the most highly over-expressed genes in human ADPKD cells compared to normal human kidney cells. Periostin accumulates in the ECM adjacent to cysts of ADPKD kidneys in situ and recombinant periostin promotes proliferation of ADPKD cyst epithelial cells. Periostin is also overexpressed in the kidneys of ARPKD patients and several animal models of PKD, suggesting that aberrant expression of periostin is a general feature of PKD regardless of the underlying genetic mutation. Global gene knockout of periostin in pcy/pcy mice, a model of slowly progressive PKD, caused a dramatic decrease in kidney weight/body weight, cyst number and cystic area, proliferating cells and mTOR signaling. There was also reduced interstitial fibrosis, improved kidney function, and a significant increase in the survivalof the mice, suggesting that periostin and its signaling pathway may be potential therapeutic targets for ADPKD. We hypothesize that periostin and possibly other matricellular proteins bind to aV-integrins and stimulate ILK, promoting proliferation and survival of cystic cells and aberrant expression of ECM molecules leading to fibrosis.
In Aim 1, we will determine if periostin overexpression in collecting ducts stimulates ILK signaling, cyst growth and interstitial fibrosis in Pkd1RC/RC hypomorphic mice and pcy/pcy mice.
In aim 2, we will determine if genetic loss of ILK slows PKD progression in Pkd1 mutant and pcy/pcy mice.
In Aim 3, we will delineate signaling pathways downstream of ILK for periostin-induced proliferation, survival and matrix production by human ADPKD cells.
In Aim 4, we will determine if pharmacological inhibition of aV3 integrin and ILK slows or halts PKD progression in Pkd1 mutant mice and pcy/pcy mice.

Public Health Relevance

The goal of this project is to determine the role of integrin-linked kinase (ILK), a key intermediate in the communication between the extracellular matrix and integrin signaling, on periostin-mediated activation of cell proliferation, cyst growth, and interstitial fibrosis in ADPKD.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK081579-08
Application #
9314541
Study Section
Kidney Molecular Biology and Genitourinary Organ Development (KMBD)
Program Officer
Maric-Bilkan, Christine
Project Start
2009-08-21
Project End
2019-04-30
Budget Start
2017-05-01
Budget End
2018-04-30
Support Year
8
Fiscal Year
2017
Total Cost
Indirect Cost
Name
University of Kansas
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
016060860
City
Kansas City
State
KS
Country
United States
Zip Code
66160
Lea, Wendy A; Parnell, Stephen C; Wallace, Darren P et al. (2018) Human-Specific Abnormal Alternative Splicing of Wild-Type PKD1 Induces Premature Termination of Polycystin-1. J Am Soc Nephrol 29:2482-2492
Tomilin, Viktor; Reif, Gail A; Zaika, Oleg et al. (2018) Deficient transient receptor potential vanilloid type 4 function contributes to compromised [Ca2+]i homeostasis in human autosomal-dominant polycystic kidney disease cells. FASEB J 32:4612-4623
Raman, Archana; Parnell, Stephen C; Zhang, Yan et al. (2018) Periostin overexpression in collecting ducts accelerates renal cyst growth and fibrosis in polycystic kidney disease. Am J Physiol Renal Physiol :
Venugopal, Jessica; McDermott, Jeffrey; Sanchez, Gladis et al. (2017) Ouabain promotes partial epithelial to mesenchymal transition (EMT) changes in human autosomal dominant polycystic kidney disease (ADPKD) cells. Exp Cell Res 355:142-152
Raman, Archana; Reif, Gail A; Dai, Yuqiao et al. (2017) Integrin-Linked Kinase Signaling Promotes Cyst Growth and Fibrosis in Polycystic Kidney Disease. J Am Soc Nephrol 28:2708-2719
Gao, Chao; Zhang, Long; Zhang, Ye et al. (2017) Insights into cellular and molecular basis for urinary tract infection in autosomal-dominant polycystic kidney disease. Am J Physiol Renal Physiol 313:F1077-F1083
Pinto, Cibele S; Raman, Archana; Reif, Gail A et al. (2016) Phosphodiesterase Isoform Regulation of Cell Proliferation and Fluid Secretion in Autosomal Dominant Polycystic Kidney Disease. J Am Soc Nephrol 27:1124-34
Rajagopal, Madhumitha; Wallace, Darren P (2015) Chloride secretion by renal collecting ducts. Curr Opin Nephrol Hypertens 24:444-9
Chen, Li; Zhou, Xia; Fan, Lucy X et al. (2015) Macrophage migration inhibitory factor promotes cyst growth in polycystic kidney disease. J Clin Invest 125:2399-412
Vijayakumar, Soundarapandian; Dang, Suparna; Marinkovich, M Peter et al. (2014) Aberrant expression of laminin-332 promotes cell proliferation and cyst growth in ARPKD. Am J Physiol Renal Physiol 306:F640-54

Showing the most recent 10 out of 19 publications