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5-Methylthioribose. Its effects and function in mammalian cells.
The Journal of Biological Chemistry
|May 10, 1984
Summary
Methylthioribose significantly enhances cell growth and viability. This compound satisfies the methylthio requirement for enzyme-deficient cells, suggesting its crucial role in mammalian cell growth.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Pathways
Background:
- Mammalian cells require specific compounds for growth and viability.
- Methylthioadenosine phosphorylase (MTAP) is an enzyme involved in purine metabolism.
- The role of 5-deoxy-5-methylthioribose (MTR) in cellular metabolism is not fully understood.
Purpose of the Study:
- To investigate the growth effects of MTR on MTAP-expressing and MTAP-deficient cell lines.
- To determine if MTR can fulfill the methylthio requirement for MTAP-deficient cells.
- To elucidate the mechanism behind the selective growth of MTAP-deficient cells in specific media.
Main Methods:
- Culturing cell lines BW5147 (MTAP-expressing) and L1210D (MTAP-deficient) with and without MTR.
- Assessing cell growth rate, saturation density, and viability.
- Supplementing horse serum with purified bovine liver MTAP to mimic fetal calf serum activity.
Main Results:
- MTR dramatically increased the growth rate, saturation density, and viability of both cell lines.
- MTR satisfied the methylthio dependence of the MTAP-deficient L1210D cell line.
- Artificially increasing MTAP activity in horse serum supported the growth of MTAP-dependent cells without added methylthio donors.
Conclusions:
- MTR plays a critical role in supporting mammalian cell growth.
- The degradation of methylthioadenosine to MTR is an essential process for cell proliferation.
- Cellular export and subsequent degradation of methylthioadenosine may provide a necessary nutrient source for MTAP-deficient cells in certain conditions.