Related Experiment Videos
Programming of poliovirus inhibition of deoxyribonucleic acid synthesis in HeLa cells
Abstract:
Ackermann, W. W. (The University of Michigan, Ann Arbor), and D. Wahl. Programming of poliovirus inhibition of deoxyribonucleic acid synthesis in HeLa cells. J. Bacteriol. 92:1051-1054. 1966.-Deletion of arginine from a culture medium reduced the rate of deoxyribonucleic acid (DNA) synthesis in uninfected HeLa cells. The normal rate was promptly restored by addition of arginine. Deletion of arginine also prevented poliovirus from inhibiting DNA synthesis in HeLa cells. However, the inhibitory potential of the infection and the capacity of the host cell for stimulation with regard to DNA synthesis were both retained in arginine-depleted cells which were infected. Upon addition of arginine late in the infection, DNA synthesis was first stimulated and then inhibited.
Insights
Arginine is essential for normal DNA synthesis in HeLa cells. Depleting arginine prevents poliovirus from inhibiting DNA synthesis, but this effect can be restored by adding arginine later in the infection.
Area of Science:
- Virology
- Cell Biology
- Biochemistry
Background:
- Poliovirus infection impacts host cell deoxyribonucleic acid (DNA) synthesis.
- Arginine is a key nutrient for cellular processes, including DNA synthesis.
Purpose of the Study:
- To investigate the role of arginine in poliovirus-mediated inhibition of DNA synthesis in HeLa cells.
- To understand how arginine availability affects host cell DNA replication during viral infection.
Main Methods:
- HeLa cells were cultured in media with and without arginine.
- Deoxyribonucleic acid (DNA) synthesis rates were measured in uninfected and poliovirus-infected cells under different arginine conditions.
- Arginine was added at various time points during infection to assess its effect.
Main Results:
- Arginine depletion significantly reduced DNA synthesis in uninfected HeLa cells.
- Poliovirus failed to inhibit DNA synthesis in arginine-depleted cells.
- Infected, arginine-depleted cells retained the capacity for DNA synthesis stimulation and subsequent inhibition upon arginine repletion.
Conclusions:
- Arginine is critical for poliovirus to effectively inhibit host cell DNA synthesis.
- The host cell's machinery for DNA synthesis regulation remains functional even when depleted of arginine.
- Arginine availability is a key factor modulating the interaction between poliovirus and host DNA metabolism.