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Erythrocyte Sedimentation Rate: A Physics-Driven Characterization in a Medical Context
Published on: March 24, 2023
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Tolerability of Erythrocyte Ribavirin Triphosphate Concentrations Depends on the ITPA Genotype
Yoichi Tanaka1, Akiko Inoue1, Tomohiko Mizunuma1
1Department of Clinical Pharmacy, Center for Clinical Pharmacy and Sciences, School of Pharmacy, Kitasato University.
Therapeutic Drug Monitoring
|March 1, 2019
Summary
The ITPA rs1127354 variant increases ribavirin triphosphate (RTP) levels in red blood cells, which is linked to reduced anemia risk during hepatitis C treatment. This genetic factor improves drug tolerability without affecting viral response.
Area of Science:
- Pharmacogenomics
- Hepatology
- Virology
Background:
- Ribavirin (RBV) is a key antiviral for chronic hepatitis C (CHC), converting to ribavirin triphosphate (RTP) to inhibit viral replication.
- RBV's use is limited by hemolytic anemia; the ITPA gene variant (rs1127354) is a known protective factor.
- Erythrocyte RTP levels are crucial for RBV efficacy and toxicity, necessitating investigation into their association with treatment outcomes.
Purpose of the Study:
- To evaluate the relationship between erythrocyte ribavirin triphosphate (RTP) concentrations and ribavirin (RBV)-induced toxicity.
- To determine the association of RTP levels and ITPA genotype with virological response in CHC patients undergoing RBV therapy.
- To investigate the protective role of the ITPA rs1127354 variant against RBV-induced anemia.
Main Methods:
- Genotyping for ITPA variants (rs1127354, rs7270101) in 28 Japanese CHC patients treated with RBV-based regimens.
- Measurement of erythrocyte RTP concentrations at 4, 8, and 12 weeks of treatment in 76 collected samples.
- Correlation analysis between ITPA genotype, RTP levels, hemoglobin (Hb) decline, and virological response.
Main Results:
- The ITPA rs1127354 variant was present in 7 patients, showing significantly higher erythrocyte RTP concentrations (P < 0.001).
- A strong correlation was found between RTP levels and hemoglobin decline at 12 weeks in both wild-type and rs1127354 variant patients (P < 0.01).
- ITPA genotype and erythrocyte RTP levels were identified as major factors for reduced Hb levels, but no association with virological response was observed.
Conclusions:
- The ITPA rs1127354 variant confers increased tolerability to erythrocyte RTP concentrations, mitigating severe anemia during RBV therapy for CHC.
- Erythrocyte RTP levels and ITPA genotype are critical determinants of RBV-induced hematological toxicity.
- Further research is warranted to explore the precise mechanisms and clinical implications of these findings.
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