There is emerging evidence to suggest the direct oncogenic potential of human immunodeficiency virus (HIV) through its trans-activator (Tat) protein. Tat targets the """"""""gate keepers"""""""" of mammalian genome, i.e., p53and RB2/p130 tumor suppressors, and may challenge genetic stability by impairing DMA repair activities. Tat may also mediate the interactions of HIV with other oncogenic viruses, such as human papilloma virus (HPV).Tat is released from HIV-infected cells and is capable of penetrating into the target cells, including those harboring HPV DMA. Frequent infection with HPV in the oral cavity has been noted in immunocompromised children and adults infected with HIV. HIV+ patients are more susceptible to infection with multiple HPV subtypes, including types 16 and 18. These """"""""high risk"""""""" HPVs are closely associated with development of malignant oral cancer. However, HPV infection alone is not sufficient for tumorigenic cell transformation, which requires additional oncogenic stimuli. Importantly, Tat positively regulates the HPV long control region (LCR) to elevate the expression of E6 and E7 viral oncogenes. Therefore, HIV may enhance the tumorigenic potential of HPV, possibly through Tat. Our long-range goal is to elucidate the role of HIV Tat in the malignant conversion of human oral keratinocytes harboring """"""""high risk"""""""" HPV genome. The central hypothesis of this project is that HIV Tat enhances the tumorigenicity of HPV in HOKs. We will test this hypothesis through the following Specific Aims: (1) to investigate the effects of HIV Tat on phenotypic alteration, i.e., proliferation, differentiation, senescence, and apoptosis, of NHOK and HOK harboring HPV genome, (2) to determine the effects of HIV Tat on immortalization and tumorigenic potential of NHOK and HOK harboring HPV genome, (3) to identify the cellular genes and proteins differentially expressed by HIV Tat transduction in NHOK and HOK harboring HPV genome. These studies will ultimately lead us to develop a novel mode for early diagnosis and treatment of HPV-related oral lesions in HIV+ patients. There is emerging evidence to suggest that Tat protein, one of gene products from human immunodeficiency virus (HIV), plays important role in the development of cancer in HIV+ patients. In this study, we will examine the role of Tat protein in the development of cancers, particularly human papilloma virus (HPV)-related cancer in oral tissue.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Clinical Investigator Award (CIA) (K08)
Project #
5K08DE017121-04
Application #
7897929
Study Section
NIDCR Special Grants Review Committee (DSR)
Program Officer
Hardwick, Kevin S
Project Start
2007-09-01
Project End
2012-07-31
Budget Start
2010-08-01
Budget End
2011-07-31
Support Year
4
Fiscal Year
2010
Total Cost
$118,015
Indirect Cost
Name
University of California Los Angeles
Department
Dentistry
Type
Schools of Dentistry
DUNS #
092530369
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Kim, Reuben H; Kang, Mo K; Kim, Terresa et al. (2015) Regulation of p53 during senescence in normal human keratinocytes. Aging Cell 14:838-46
Kim, Reuben H; Williams, Drake W; Bae, Susan et al. (2013) Camphorquinone inhibits odontogenic differentiation of dental pulp cells and triggers release of inflammatory cytokines. J Endod 39:57-61
Williams, Drake W; Wu, Hongkun; Oh, Ju-Eun et al. (2013) 2-Hydroxyethyl methacrylate inhibits migration of dental pulp stem cells. J Endod 39:1156-60
Lee, Sung Hee; Hong, Hannah S; Liu, Zi Xiao et al. (2012) TNF? enhances cancer stem cell-like phenotype via Notch-Hes1 activation in oral squamous cell carcinoma cells. Biochem Biophys Res Commun 424:58-64
Shin, Ki-Hyuk; Kim, Reuben H; Yu, Bo et al. (2011) Expression and mutation analysis of heterogeneous nuclear ribonucleoprotein G in human oral cancer. Oral Oncol 47:1011-6
Shin, Ki-Hyuk; Pucar, Ana; Kim, Reuben H et al. (2011) Identification of senescence-inducing microRNAs in normal human keratinocytes. Int J Oncol 39:1205-11
Kim, R H; Lee, R S; Williams, D et al. (2011) Bisphosphonates induce senescence in normal human oral keratinocytes. J Dent Res 90:810-6
Kim, Reuben H; Lieberman, Mark B; Lee, Rachel et al. (2010) Bmi-1 extends the life span of normal human oral keratinocytes by inhibiting the TGF-beta signaling. Exp Cell Res 316:2600-8
Kim, Reuben H; Kim, Roy; Chen, Wei et al. (2008) Association of hsp90 to the hTERT promoter is necessary for hTERT expression in human oral cancer cells. Carcinogenesis 29:2425-31
Kim, Reuben H; Yochim, Ji Min; Kang, Mo K et al. (2008) HIV-1 Tat enhances replicative potential of human oral keratinocytes harboring HPV-16 genome. Int J Oncol 33:777-82