Intracellular uptake of thymidine and antiherpetic drugs for thymidine kinase-deficient mutants of herpes simplex virus type 1.
The influence of the thymidine (Thd) kinase (TK) of herpes simplex virus type 1 (HSV-1) on the intracellular uptake and anabolism of nucleosides has been investigated. To compare the differences between the TK-positive (TK(+)) and TK-deficient strains, acyclovir (ACV)-resistant strains were cloned from a cell culture and classified into 2 groups, viz. the TK-partial (TK(p)) and TK-negative (TK(-)). The cellular uptake of thymidine was highly dependent on the viral TK (vTK) activity. The TK(+) strain showed the highest level of intracellular thymidine uptake, the TK(p) strain a moderate level, which varied from strain to strain, and the TK(-) and mock strains showed little uptake. The inhibition of viral replication by ACV, ganciclovir (GCV) and penciclovir (PCV) did not decrease the Thd uptake at all. On the contrary, a notable increase found to be induced by ACV. The influence of the vTK on the uptake of GCV or PCV was much greater than that of ACV. The metabolism was generally less dependent on the vTK activity than the influx. The influx and phosphorylation rates of GCV and PCV were dependent on the substrate specificity of the vTK.
Pharmacology Research Center, Korea Research Institute of Chemical Technology, Daejon 305-600, South Korea.
Pan Kee
PK
Bae
Jee Hyun
JH
Kim
Hae Soo
HS
Kim
In Kwon
IK
Chung
Sang Gi
SG
Paik
Chong-Kyo
CK
Lee
D000212:Acyclovir / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology; D000818:Animals; D000998:Antiviral Agents / Q000378:metabolism* / Q000494:pharmacology; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D004247:DNA / Q000378:metabolism*; D004279:DNA, Viral / Q000378:metabolism*; D024882:Drug Resistance, Viral; D015774:Ganciclovir / Q000378:metabolism / Q000494:pharmacology; D006147:Guanine; D018259:Herpesvirus 1, Human / Q000201:enzymology* / Q000472:pathogenicity; D006801:Humans; D009154:Mutation; D013379:Substrate Specificity; D013936:Thymidine / Q000378:metabolism*; D013937:Thymidine Kinase / Q000235:genetics / Q000378:metabolism*; D014709:Vero Cells
D000998:Antiviral Agents; D004279:DNA, Viral; C053539:penciclovir; D006147:Guanine; D004247:DNA; D013937:Thymidine Kinase; D015774:Ganciclovir; D013936:Thymidine; D000212:Acyclovir