Abstract
A cis-diamminedichloroplatinum [DDP (cisplatin)]-resistant population of Schizosaccharomyces pombe was developed through chronic exposure of the 972 h strain to increasing concentrations of the drug. The resulting cells, designated wtr2, were 5.25-fold resistant to DDP, and resistance was retained by clone isolated from this population in the absence of drug for >5 months. After backcrossing and isolation of a single clone, random spore analysis gave a segregation ratio close to 1:1 for DDP resistance and sensitivity. Tetrad analysis confirmed a mendelian 2:2 segregation, suggesting that a single nuclear gene was responsible for the DDP-resistant phenotype. Stable diploids obtained from the mating of a resistant spore carrying the ade6-216 marker with the mei2-102-ade6-210 meiosis-deficient mutant remained resistant, indicating that the resistant phenotype was expressed dominantly. There was no difference between the accumulation of the DDP analog [3H]dichloro(ethylenediamine)-platinum(II) into whole cells derived from the sensitive and the resistant spores obtained from the last backcross. The resistant clones from a single tetrad did not have an increased level of glutathione and were collaterally sensitive to cadmium and arsenite. We conclude that in S. pombe, a stable and dominant DDP-resistant phenotype can be mediated by a single allele, that the phenotype is not accompanied by cross-resistance to cadmium or arsenite, and that the mechanism is not associated with a significant alteration in glutathione level or DDP uptake.
| Original language | English |
|---|---|
| Pages (from-to) | 1080-1086 |
| Number of pages | 7 |
| Journal | Molecular Pharmacology |
| Volume | 50 |
| Issue number | 5 |
| Publication status | Published - Nov 1996 |
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Isolation and characterization of a cisplatin-resistant strain of Schizosaccharomyces pombe. / Perego, Paola; Jimenez, Gretchen; Howell, Stephen B.
In: Molecular Pharmacology, Vol. 50, No. 5, 11.1996, p. 1080-1086.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Isolation and characterization of a cisplatin-resistant strain of Schizosaccharomyces pombe
AU - Perego, Paola
AU - Jimenez, Gretchen
AU - Howell, Stephen B.
PY - 1996/11
Y1 - 1996/11
N2 - A cis-diamminedichloroplatinum [DDP (cisplatin)]-resistant population of Schizosaccharomyces pombe was developed through chronic exposure of the 972 h strain to increasing concentrations of the drug. The resulting cells, designated wtr2, were 5.25-fold resistant to DDP, and resistance was retained by clone isolated from this population in the absence of drug for >5 months. After backcrossing and isolation of a single clone, random spore analysis gave a segregation ratio close to 1:1 for DDP resistance and sensitivity. Tetrad analysis confirmed a mendelian 2:2 segregation, suggesting that a single nuclear gene was responsible for the DDP-resistant phenotype. Stable diploids obtained from the mating of a resistant spore carrying the ade6-216 marker with the mei2-102-ade6-210 meiosis-deficient mutant remained resistant, indicating that the resistant phenotype was expressed dominantly. There was no difference between the accumulation of the DDP analog [3H]dichloro(ethylenediamine)-platinum(II) into whole cells derived from the sensitive and the resistant spores obtained from the last backcross. The resistant clones from a single tetrad did not have an increased level of glutathione and were collaterally sensitive to cadmium and arsenite. We conclude that in S. pombe, a stable and dominant DDP-resistant phenotype can be mediated by a single allele, that the phenotype is not accompanied by cross-resistance to cadmium or arsenite, and that the mechanism is not associated with a significant alteration in glutathione level or DDP uptake.
AB - A cis-diamminedichloroplatinum [DDP (cisplatin)]-resistant population of Schizosaccharomyces pombe was developed through chronic exposure of the 972 h strain to increasing concentrations of the drug. The resulting cells, designated wtr2, were 5.25-fold resistant to DDP, and resistance was retained by clone isolated from this population in the absence of drug for >5 months. After backcrossing and isolation of a single clone, random spore analysis gave a segregation ratio close to 1:1 for DDP resistance and sensitivity. Tetrad analysis confirmed a mendelian 2:2 segregation, suggesting that a single nuclear gene was responsible for the DDP-resistant phenotype. Stable diploids obtained from the mating of a resistant spore carrying the ade6-216 marker with the mei2-102-ade6-210 meiosis-deficient mutant remained resistant, indicating that the resistant phenotype was expressed dominantly. There was no difference between the accumulation of the DDP analog [3H]dichloro(ethylenediamine)-platinum(II) into whole cells derived from the sensitive and the resistant spores obtained from the last backcross. The resistant clones from a single tetrad did not have an increased level of glutathione and were collaterally sensitive to cadmium and arsenite. We conclude that in S. pombe, a stable and dominant DDP-resistant phenotype can be mediated by a single allele, that the phenotype is not accompanied by cross-resistance to cadmium or arsenite, and that the mechanism is not associated with a significant alteration in glutathione level or DDP uptake.
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M3 - Article
VL - 50
SP - 1080
EP - 1086
JO - Molecular Pharmacology
JF - Molecular Pharmacology
SN - 0026-895X
IS - 5
ER -