The long-term goal of the proposed research is to understand the processes that control differentiation of erythroid cells. The approach is to analyze the properties of permanent mouse erythroleukemia (MEL) cell lines that can be induced to undergo terminal erythroid differentiation in cell culture. A major aim is to study the early events that control the transition of these cells from proliferating, nondifferentiating tumor cells to cells that are nontumorigenic and committed to terminal differentiation.
A second aim i s to learn how the amounts of globin mRNA and other specific mRNAs are controlled during terminal erythroid differentiation. A primary method to be used in these studies is cellular genetics, including DNA-mediated gene transfer of cloned genes and gene chimeras. The cellular oncogene c-myc undergoes dramatic changes in expression in the period before MEL cells become irreversibly committed to terminal differentiation. To test the role of c-myc in controlling differentiation, additional copies of an independently regulated c-myc gene will be introduced into MEL cells. Further tests of a role for c-myc will be accomplished by studying changes in c-myc expression when the probability and kinetics of differentiation are altered. C-myc gene transcription and mRNA stability will be measured to learn how rapid changes in expression occur. Differentiating MEL cells appear to utilize both transcriptional and post-transcriptional mechanisms to control the levels of specific mRNAs. To identify cis-acting DNA sequences and diffusible protein factors that regulate globin gene transcription, cloned globin genes will be introduced into MEL cells and their expression will be studied during induced differentiation. The isolation of mutant MEL cells with defects in transcriptional control factors also will be undertaken. To investigate post-transcriptional control of mRNA production, the base sequences in mRNA that control its turnover will be studied. The sequences will be identified by constructing and introducing into cells gene chimeras between two genes whose transcripts differ in stability. This method will then be applied to specific mRNAs that have different stabilities in terminally differentiating MEL cells. (M)

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37CA016368-24
Application #
2414074
Study Section
Special Emphasis Panel (NSS)
Project Start
1977-05-01
Project End
1998-04-30
Budget Start
1997-05-01
Budget End
1998-04-30
Support Year
24
Fiscal Year
1997
Total Cost
Indirect Cost
Name
Albert Einstein College of Medicine
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
009095365
City
Bronx
State
NY
Country
United States
Zip Code
10461
Matushansky, Igor; Radparvar, Farshid; Skoultchi, Arthur I (2003) CDK6 blocks differentiation: coupling cell proliferation to the block to differentiation in leukemic cells. Oncogene 22:4143-9
Rekhtman, Natasha; Choe, Kevin S; Matushansky, Igor et al. (2003) PU.1 and pRB interact and cooperate to repress GATA-1 and block erythroid differentiation. Mol Cell Biol 23:7460-74
Stopka, Tomas; Skoultchi, Arthur I (2003) The ISWI ATPase Snf2h is required for early mouse development. Proc Natl Acad Sci U S A 100:14097-102
Matushansky, I; Radparvar, F; Skoultchi, A I (2000) Manipulating the onset of cell cycle withdrawal in differentiated erythroid cells with cyclin-dependent kinases and inhibitors. Blood 96:2755-64
Starck, J; Doubeikovski, A; Sarrazin, S et al. (1999) Spi-1/PU.1 is a positive regulator of the Fli-1 gene involved in inhibition of erythroid differentiation in friend erythroleukemic cell lines. Mol Cell Biol 19:121-35
Wang, Z F; Sirotkin, A M; Buchold, G M et al. (1997) The mouse histone H1 genes: gene organization and differential regulation. J Mol Biol 271:124-38
Rao, G; Rekhtman, N; Cheng, G et al. (1997) Deregulated expression of the PU.1 transcription factor blocks murine erythroleukemia cell terminal differentiation. Oncogene 14:123-31
Rao, G; Alland, L; Guida, P et al. (1996) Mouse Sin3A interacts with and can functionally substitute for the amino-terminal repression of the Myc antagonist Mxi1. Oncogene 12:1165-72
Dong, Y; Liu, D; Skoultchi, A I (1995) An upstream control region required for inducible transcription of the mouse H1(zero) histone gene during terminal differentiation. Mol Cell Biol 15:1889-900
Sirotkin, A M; Edelmann, W; Cheng, G et al. (1995) Mice develop normally without the H1(0) linker histone. Proc Natl Acad Sci U S A 92:6434-8

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