Gut microbiota and tacrolimus dosing in kidney transplantation

• Published in: PloS one Vol. 10; no. 3; p. e0122399
• Main Authors: Lee, John R, Muthukumar, Thangamani, Dadhania, Darshana, Taur, Ying, Jenq, Robert R, Toussaint, Nora C, Ling, Lilan, Pamer, Eric, Suthanthiran, Manikkam
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 27-03-2015; Public Library of Science (PLoS)
• Subjects: Abundance; Adult; Aged; Antibiotics; Bacteria - drug effects; Bioinformatics; Cancer; Composition; Dosage; Dose-Response Relationship, Drug; Drug dosages; Drug metabolism; Enterococcus; Faecalibacterium prausnitzii; Feces; Feces - microbiology; Female; Gastrointestinal Microbiome - genetics; Graft Rejection - drug therapy; Graft Rejection - genetics; Graft Rejection - microbiology; Health aspects; Hospitals; Humans; Hypertension; Infectious diseases; Inflammation; Intestinal microflora; Kidney Transplantation; Kidney transplants; Kidneys; Male; Medicine; Metabolism; Microbiota; Microbiota (Symbiotic organisms); Microorganisms; Middle Aged; Nephrology; Organ transplant recipients; Physiological aspects; RNA; RNA, Ribosomal, 16S - genetics; rRNA 16S; Standard error; Systematic review; Tacrolimus; Tacrolimus - administration & dosage; Transplant Recipients; Transplantation; Transplants; Transplants & implants; Variance analysis; New York; United States > US
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0122399

Tacrolimus dosing to establish therapeutic levels in recipients of organ transplants is a challenging task because of much interpatient and intrapatient variability in drug absorption, metabolism, and disposition. In view of the reported impact of gut microbial species on drug metabolism, we investigated the relationship between the gut microbiota and tacrolimus dosing requirements in this pilot study of adult kidney transplant recipients. Serial fecal specimens were collected during the first month of transplantation from 19 kidney transplant recipients who either required a 50% increase from initial tacrolimus dosing during the first month of transplantation (Dose Escalation Group, n=5) or did not require such an increase (Dose Stable Group, n=14). We characterized bacterial composition in the fecal specimens by deep sequencing of the PCR amplified 16S rRNA V4-V5 region and we investigated the hypothesis that gut microbial composition is associated with tacrolimus dosing requirements. Initial tacrolimus dosing was similar in the Dose Escalation Group and in the Stable Group (4.2 ± 1.1 mg/day vs. 3.8 ± 0.8 mg/day, respectively, P=0.61, two-way between-group ANOVA using contrasts) but became higher in the Dose Escalation Group than in the Dose Stable Group by the end of the first transplantation month (9.6 ± 2.4 mg/day vs. 3.3 ± 1.5 mg/day, respectively, P<0.001). Our systematic characterization of the gut microbial composition identified that fecal Faecalibacterium prausnitzii abundance in the first week of transplantation was 11.8% in the Dose Escalation Group and 0.8% in the Dose Stable Group (P=0.002, Wilcoxon Rank Sum test, P<0.05 after Benjamini-Hochberg correction for multiple hypotheses). Fecal Faecalibacterium prausnitzii abundance in the first week of transplantation was positively correlated with future tacrolimus dosing at 1 month (R=0.57, P=0.01) and had a coefficient ± standard error of 1.0 ± 0.6 (P=0.08) after multivariable linear regression. Our novel observations may help further explain inter-individual differences in tacrolimus dosing to achieve therapeutic levels.