Anjaparavanda P. Naren, PhD

Thomas Boat Chair in Cystic Fibrosis Research

Co-Director, Cystic Fibrosis Research Center

Professor, UC Department of Pediatrics

Cystic fibrosis; secretory diarrhea.

Cystic fibrosis transmembrane conductance regulator (CFTR) is a cAMP-regulated chloride channel located primarily on the apical surface of epithelial cells that line various organs, including the airways and the gut. CFTR dysfunction is detrimental and may result in life-threatening medical disorders. Dr. Naren's laboratory studies two such disorders; (1) Cystic fibrosis, a lethal genetic disease that affects mostly the Caucasian population (>30,000 in USA), in which the CFTR chloride channel is HYPO-functional and (2) Secretory diarrhea, a disease affecting millions of children worldwide, in which HYPER-function of the CFTR chloride channel can occur due to infectious toxins, such as cholera toxin and E. coli enterotoxin. His lab is interested in identifying interactions between CFTR and its binding partners and defining how spatiotemporal regulation of CFTR-containing macromolecular complexes in the apical compartment of polarized epithelial cells lining the secretory epithelia regulates overall fluid secretion. Our studies will identify new drug targets for cystic fibrosis, secretory diarrhea, and other diseases resulting from CFTR dysfunction and provide insights into the etiology of diseases associated with CFTR-interacting molecules.

PhD: Biochemistry, Indian Institute of Science, Bangalore, India, 1993.

View PubMed Publications

Ren A, Zhang W, Sunitha Y, Arora K, Sinha C, Moon CS, Naren AP. MAST205 Competes with CAL for Binding to CFTR to Regulate CFTR-mediated Fluid Transport. J Biol Chem. 2013 April:26;288(17):12325-34.

Yarlagadda S, Zhang W, Penmatsa H, Ren A, Arora K, Naren AP*, Khan FA, Donnellan C, Srinivasan S, Stokes D, Kappes JC. A Young Hispanic with c.1646G>A Mutation Exhibits Severe Cystic Fibrosis Lung Disease: Is Ivacaftor an Option for Therapy? Am J Respir Crit Care Med. 2012 Oct:1 186(7):694-6. (*Corresponding Author)

Zhang  W, Penmatsa H, Ren A, Punchihewa C, Lemoff A, Yan B, Fujii N, Naren AP. Functional regulation of CFTR-containing macromolecular complexes: a small-molecule inhibitor approach. Biochem J. 2011 April:15;435(2):451–62

Penmatsa H, Zhang W, Yarlagadda S, Li C, Conoley VG, Yue J, Bahouth SW, Buddington RK, Zhang G, Nelson DJ, Sonecha MD, Manganiella V, Wine JJ, Naren AP. Compartmentalized cyclic adenosine 3’,5’-monophosphate at the plasma membrane clusters PDE3A and cystic Fibrosis transmembrane conductance regulator into microdomains. Mol Biol Cell. 2010 Mar:15;21:1097-110.

Li C, Krishnamurthy PC, Penmatsa H, Marrs KL, Wang XQ, Zaccolo M, Jalink K, Li M, Nelson DJ, Schuetz JD, Naren AP. Spatiotemporal Coupling of cAMP Transporter to CFTR Chloride Channel Function in the Gut Epithelia. Cell. 2007 Nov:30;131(5): 940-51.

Li C, Dandridge KS, Di A, Marrs KL, Harris EL, Roy K, Jackson JS, Makarova NV, Fujiwara Y, Farrar, PL, Nelson DJ, Tigyi GJ, Naren AP. Lysophosphatidic acid inhibits cholera toxin-induced secretory diarrhea through CFTR-dependent protein interactionsJ Exp Med. 2005 Oct:3; 202(7):975-86.

Naren AP, Cobb B, Li C, Roy K, Nelson D, Heda GD, Liao J, Kirk KL, Sorscher EJ, Hanrahan J, Clancy JP. A macromolecular complex of beta 2 adrenergic receptor, CFTR, and ezrin/radixin/moesin-binding phosphoprotein 50 is regulated by PKA. Proc Natl Acad Sci USA. 2003 Jan:7;100(1):342-46.

Naren AP, Anke D, Cormet-Boyaka E, Boyaka PN, McGhee JR, Zhou W,  Akagawa K, Fujiwara T, Thome U, Engelhardt JF, Nelson DJ, Kirk KL. Syntaxin 1A is expressed in airway epithelial cells, where it modulates CFTR Cl(-) currents. J Clin Invest.  2000 Feb;105(3):377-86.

Naren AP, Cormet-Boyaka E, Fu J, Villain M, Blalock E, Quick MW, Kirk KL. CFTR Chloride channel regulation by an interdomain interaction. Science. 1999 Oct:15;286(5439):544-8.

Naren AP, Nelson DJ, Xie W, Jovov B, Tousson A, Pevsner J, Bennett MK, Benos DJ, Quick MW, Kirk KL. Regulation of CFTR chloride channels by syntaxin and Munc18 isoforms. Nature. 1997 Nov:20;390(6657):302-5.

Inhibition of a cAMP transporter (MRP4) in the gut induces diarrhea. Principal Investigator. National Institutes of Health. June 2009-Apr 2018. DK080834.

LPA2-receptor containing complexes in regulating secretory diarrhea. Principal Investigator. July 2011-June 2020. RO1 (DK093045).

CF-Patient Specific Enteroids from Small Intestine and Colon. Principal Investigator. Cystic Fibrosis Foundation. July 2014-June 2016. NAREN14XXO.

Characterization of an inhibitory protein complex for cystic fibrosis therapy. Collaborator. Aug 2014-July 2019. RO1 (HL123535).

Personalizing Cystic Fibrosis Research Translation. Principal Investigator/Director-CF Human Model Systems Core. CFF-Research Development Project. July 2015-June 2019. CLANCY15R0.

Demonstrate that GC-C modulation of CFTR in the gut epithelia using enteroids from CF patients increases intestinal fluid secretion. Principal Investigator. Ironwood Grant. June 2015-May 2016. LIN-PH-44.