BUSM Pathology & Laboratory Medicine Dissertation Defense Seminar Thursday, July 30th, 2015; 11:00 AM 670 Albany Street...
Maria V. Panchenko, Ph.D.
Boston University School of Medicine
Department of Pathology and Laboratory Medicine
670 Albany Street, #416
Boston, MA 02118
- BA in Biology Moscow State University
- MS in Biochemistry Moscow State University Department of Biochemistry
- Ph.D in Biochemistry Moscow State University Department of Biochemistry
- Associate Research Scientist, Department of Biochemistry, Boston University School of Medicine, Boston, MA
- Associate Research Scientist, Department of Medicine, Boston University School of Medicine, Boston, MA
- Instructor of Medicine, Department of Medicine, Boston University Medical Center, Boston, MA
Multicellular organism consists of various highly specialized cells that are known to express different sets of specific proteins and perform diverse functions. How do cells with identical genetic information feature variety of phenotypes? An important mechanism accounting for such differences operates on epigenetic level and utilizes chromatin structure. It has become clear now that proper packaging of DNA strands is by far not the only function of chromatin. By virtue of dynamic post-translational modifications and protein-protein interactions chromatin can regulate DNA metabolism and transcription. The proper functioning of this chromatin-mediated signal transduction network is required for DNA maintenance and integrity, while defects are known to result in inappropriate cell division, DNA damage, instability leading to various diseases.
A number of conserved aminoacids within the N-terminal tails of histones can be modified by acetylation, methylation, phosphorylation, and SUMOylation. This in turn alters chromatin structure and its interactions with transcription related factors, DNA and RNA polymerases, DNA repair complexes, other crucial regulatory factors in the cell nucleus. The covalent modifications of histones are reversible, dynamic and therefore provide means for efficient regulation. Histone modifying enzymes are often found within the large multisubunit complexes. Proteins within these complexes contain various interaction domains such as bromodomains and chromodomains that have affinity to specific modified histones. Thus chromatin-mediated transcription is based on a network of regulated protein-protein interactions and operates in combinatorial mode.
We characterized the novel PHD zinc finger protein PHF17/JADE1 and reported that JADE1 is a transcriptional factor that promotes histone H4 acetylation in vivo and in vitro. Moreover we found that JADE1 is responsible for bulk histone H4 acetylation levels in epithelial cells. The unique histone H4 specificity of JADE1 is known to be characteristic to TIP60 and HBO1 which belong to the MYST family of Histone Acetyl Transferases (HATs). We found that JADE1 interacts with TIP60 and HBO1. Interestingly, all three JADE1/2/3 paralogs as well as ING4/5 tumor suppressors are found in HAT HBO1 complex, which is a HAT Binding Origin Replication Complex1. HAT activity of HBO1 is thought to be important for the DNA replication licensing that occurs during the G1 phase of the cell cycle.
We are interested in a role of JADE1/2/3 and HBO1 in the cell cycle. HBO1-JADE1-ING4/5 might affect DNA replication by acetylating histones at the origin replication sites and thereby affecting interactions with other replication factors. In addition, the activities of HBO1-JADE1 might regulate expression levels of cell cycle related factors by affecting their transcriptional rates or protein stability and half-life. Other possibilities are also considered.
We investigated role of JADE1 in HAT activity of HBO1 and demonstrated that PHD zinc fingers of JADE1 are specifically required for HBO1 to acetylate histone H4 within a nucleosome. Unlike chromo- , bromo- , or SET-domains, the PHD zinc finger of JADE1 targets a HAT complex to the nucleosomal histones regardless of their modification state, representing a novel mechanism of chromatin targeting. We are investigating a role of JADE1 PHD zinc fingers in histone acetylation, cell cycle and transcription activities of HBO1 complex.
Several HAT complexes have been linked to diseases, including cancers. Moreover, PHD zinc fingers of known HATs and other proteins such as p300, MOZ, MORF, AIRE, INGs are targets of mutations in several diseases. JADE1 and HBO1 may play a role in cancers and in cells regeneration after injuries.
We used mice model of acute kidney injury after ischemia-reperfusion and recently identified role of HAT HBO1 complex in tubular cells regeneration. By using combination of in vitro and in vivo models, including transgenic mice model, we are currently dissecting mechanisms by which HBO1-JADE1 participate in tissue regeneration. Our long term goal is to find out how these complexes regulate cell cycle in regenerating normal tissues, as well as in diseases with abnormal cell proliferation, including cancer.
Nirodhini Sirivwardana, Ph. D., Research Associate Scientist
Charlie Aoun, B. Sc. Candidate
Konstantine Spirin, Ph.D., Research Associate Scientist
Somdutta Mitra, M.S.
Joseph Haegele, B. Sc.
Sherry Blackmon, B. Sc.
Alice Lee, 2012 Summer UROP award, B. Sc. Candidate
“Histone Acetyl Transferase HBO1 in kidney epithelial cell cycle”
Role: PI This 5 year project investigates role of JADE1-HBO1 in the cell cycle in kidney epithelial cell cycle and regeneration after hypoxic injury.
Graduate (Ph.D.) Student
Havasi, A., J. A. Haegele, J. M. Gall, S. Blackmon, T. Ichimura, R. G. Bonegio, and M. V. Panchenko.
2013. Histone acetyl transferase (HAT) HBO1 and JADE1 in epithelial cell regeneration. Am J Pathol
Foy, R. L., V. C. Chitalia, M. V. Panchenko, L. Zeng, D. Lopez, J. W. Lee, S. V. Rana, A. Boletta, F. Qian, L.
Tsiokas, K. B. Piontek, G. G. Germino, M. I. Zhou, and H. T. Cohen. 2012. Polycystin-1 regulates the
stability and ubiquitination of transcription factor Jade-1. Hum Mol Genet 5456-5471.
Foy, R. L., I. Y. Song, V. C. Chitalia, H. T. Cohen, N. Saksouk, C. Cayrou, C. Vaziri, J. Cote, and M. V.
Panchenko. 2008. Role of Jade-1 in the histone acetyltransferase (HAT) HBO1 complex. J Biol Chem
Chitalia, V. C., R. L. Foy, M. M. Bachschmid, L. Zeng, M. V. Panchenko, M. I. Zhou, A. Bharti, D. C. Seldin, S. H. Lecker, I. Dominguez, and H. T. Cohen. 2008. Jade-1 inhibits Wnt signalling by ubiquitylating beta-catenin and mediates Wnt pathway inhibition by pVHL. Nat Cell Biol 1208-1216.
DiCamillo, S. J., S. Yang, M. V. Panchenko, P. A. Toselli, E. F. Naggar, C. B. Rich, P. J. Stone, M. A.
Nugent, and M. P. Panchenko. 2006. Neutrophil elastase-initiated EGFR/MEK/ERK signaling counteracts
stabilizing effect of autocrine TGF-beta on tropoelastin mRNA in lung fibroblasts. Am J Physiol Lung Cell
Mol Physiol L232-243.
Zhou, M. I., R. L. Foy, V. C. Chitalia, J. Zhao, M. V. Panchenko, H. Wang, and H. T. Cohen. 2005. Jade-1,
a candidate renal tumor suppressor that promotes apoptosis. Proc Natl Acad Sci U S A 11035-11040.
Panchenko, M. V., M. I. Zhou, and H. T. Cohen. 2004. von Hippel-Lindau partner Jade-1 is a
transcriptional co-activator associated with histone acetyltransferase activity. J Biol Chem 56032-
DiCamillo, S. J., I. Carreras, M. V. Panchenko, P. J. Stone, M. A. Nugent, J. A. Foster, and M. P. Panchenko. 2002. Elastase-released epidermal growth factor recruits epidermal growth factor receptor and extracellular signal-regulated kinases to down- regulate tropoelastin mRNA in lung fibroblasts. J Biol Chem 18938-18946.
Panchenko, M. V., H. W. Farber, and J. H. Korn. 2000. Induction of heme oxygenase-1 by hypoxia and
free radicals in human dermal fibroblasts. Am J Physiol Cell Physiol C92-C101.
Panchenko, M. V., W. G. Stetler-Stevenson, O. V. Trubetskoy, S. N. Gacheru, and H. M. Kagan. 1996.
Metalloproteinase activity secreted by fibrogenic cells in the processing of prolysyl oxidase. Potential
role of procollagen C-proteinase. J Biol Chem 7113-7119.
Graven, K. K., R. F. Troxler, H. Kornfeld, M. V. Panchenko, and H. W. Farber. 1994. Regulation of
endothelial cell glyceraldehyde-3-phosphate dehydrogenase expression by hypoxia. J Biol Chem
Kagan, H. M., V. B. Reddy, M. V. Panchenko, N. Nagan, A. M. Boak, S. N. Gacheru, and K. M. Thomas.
1995. Expression of lysyl oxidase from cDNA constructs in mammalian cells: the propeptide region is not
essential to the folding and secretion of the functional enzyme. Journal of Cellular Biochemistry 329-