Search Results to Sajal K. Ghosh, PhD

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Research Expertise & Professional Interests My broad research interest is to study the role of non-coding RNAs in tumorigenesis. Project 1. Over the last decade microRNAs have been identified as master regulator of almost all major biochemical pathways that regulate cellular metabolism. Most importantly, their deregulation is closely related to many cancers. In pancreatic cancer, which has the lowest 5-year survival rate, the level of microRNA let-7 is consistently downregulated. We are interested to identify the link between let-7 downregulation and aggressive growth characteristics of pancreatic cancer cells. We identified that let-7 level is inversely proportional with STAT3 signaling in pancreatic cancer. We are working on the detail mechanism of the process and testing in xenograft model whether let-7 reexpression can be a therapeutic option in pancreatic cancer. Project 2. My other research interest is to understand the molecular basis of tumorigenesis by leukemia virus and Epstein Barr virus (EBV). Leukemia viruses are oncogene-deficient simple retroviruses but how their infection in animals causes tumor development in a predicable manner still remains poorly understood. We have demonstrated, using feline leukemia virus as a model, that the long-terminal region (LTR) of these viruses independently activates AP-1 and NF?B signaling pathways in the host cells. We hypothesized that such activities may aid in tumorigenesis. We found that the U3-LTR region makes small non-coding RNA, whose production is directly related to the transactivation potential of the LTR. Our recent studies demonstrated that toll-like receptor 3 (TLR3) expression is necessary for such activity. Our current research effort is dedicated to understand the regulation of expression of the LTR-transcript and how it activates TLR3 signaling. EBV, on the other hand, is a large DNA tumor virus, associated with several human malignancies. However, EBV maintains a latent state of infection in these cancers and it is believed that the latent gene products play a discrete role in the genesis or maintenance of EBV-associated tumors. Our interest is to determine the contribution of EBV latent gene products in tumorigenesis. Other Projects: Additionally in collaborative studies we are also interested in indentifying better therapeutic options against EBV-associated tumors. Prognosis of certain type of lymphomas is very poor when EBV is present in them (such as post-transplantation lymphoproliferative disease, Burkitt’s lymphoma, Hodgkin’s disease). A combination approach where lytic EBV replication is first induced by chemicals and then followed by treatment with anti-herpesvirus drugs, has been previously found to be effective in selective killing of EBV-containing tumor cells. We have and continues to characterize novel histone deacetylase inhibitors or other cytotoxic compounds as inducer of lytic replication of EBV and their usefulness in selective killing of EBV-associated tumors in the combinational therapy model. We are validating efficacy of such approach in xenograft tumor model in NOD/SCID mice. In another collaborative study we are working on the molecular mechanism of anticancer effect of novel chemically modified plumbagin derivative. Especially, we are interested in the autophagic activity of the compound and its relationship to cell death signaling.
Self-Described Keywords Leukemia virus

One or more keywords matched the following items that are connected to Ghosh, Sajal

Item TypeName
Concept Leukemia Virus, Feline
Concept Moloney murine leukemia virus
Concept Virus Activation
Concept Virus Replication
Concept Virus Latency
Concept vif Gene Products, Human Immunodeficiency Virus
Concept rev Gene Products, Human Immunodeficiency Virus
Concept tat Gene Products, Human Immunodeficiency Virus
Academic Article Viral dynamics in human immunodeficiency virus type 1 infection.
Academic Article Long-term inhibition of clinical and laboratory human immunodeficiency virus strains in human T-cell lines containing an HIV-regulated diphtheria toxin A chain gene.
Academic Article Envelope glycoprotein gp120 of human immunodeficiency virus type 1 alters ion transport in astrocytes: implications for AIDS dementia complex.
Academic Article A molecular clone of HIV-1 tropic and cytopathic for human and chimpanzee lymphocytes.
Academic Article Apoptosis induced by infection of primary brain cultures with diverse human immunodeficiency virus type 1 isolates: evidence for a role of the envelope.
Academic Article Feline leukemia virus long terminal repeat activates collagenase IV gene expression through AP-1.
Academic Article Long terminal repeat regions from exogenous but not endogenous feline leukemia viruses transactivate cellular gene expression.
Academic Article Mutations that abrogate transactivational activity of the feline leukemia virus long terminal repeat do not affect virus replication.
Academic Article Leukemia virus long terminal repeat activates NFkappaB pathway by a TLR3-dependent mechanism.
Academic Article Short, discontinuous exposure to butyrate effectively sensitizes latently EBV-infected lymphoma cells to nucleoside analogue antiviral agents.
Academic Article Identification of LTR-specific small non-coding RNA in FeLV infected cells.
Academic Article Histone deacetylase inhibitors are potent inducers of gene expression in latent EBV and sensitize lymphoma cells to nucleoside antiviral agents.
Academic Article Advances in Virus-Directed Therapeutics against Epstein-Barr Virus-Associated Malignancies.
Grant Leukemia Virus Long Terminal Repeat-Mediated Cellular Gene Activation and Tumorigenesis

Search Criteria
  • Leukemia
  • virus