Associations between Serum Leptin Level and Bone Turnover in Kidney Transplant Recipients

Csaba P. Kovesdy*, Miklos Z. Molnar, Maria E. Czira, Anna Rudas, Akos Ujszaszi, Laszlo Rosivall, Miklos Szathmari, Adrian Covic, Andras Keszei, Gabriella Beko, Peter Lakatos, Janos Kosa, Istvan Mucsi

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Background and objectives: Obesity is associated with increased parathyroid hormone (PTH) in the general population and in patients with chronic kidney disease (CKD). A direct effect of adipose tissue on bone turnover through leptin production has been suggested, but such an association has not been explored in kidney transplant recipients. Design, setting, participants, & measurements: This study examined associations of serum leptin with PTH and with biomarkers of bone turnover (serum beta crosslaps [CTX, a marker of bone resorption] and osteocalcin [OC, a marker of bone formation]) in 978 kidney transplant recipients. Associations were examined in multivariable regression models. Path analyses were used to determine if the association of leptin with bone turnover is independent of PTH. Results: Higher leptin levels were associated with higher PTH and lower vitamin D levels, and adjustment for vitamin D attenuated the association between leptin and PTH. However, higher leptin was also significantly associated with lower levels of the bone turnover markers: 1 SD higher leptin was associated with 0.13 lower log-OC (-0.17, -0.08, P <0.001) and 0.030 lower log-CTX (-0.045, -0.016, P <0.001) after multivariable adjustments. Path analysis indicated that the association of leptin with PTH was mostly mediated through vitamin D, and that the association between leptin and bone turnover was independent of PTH and vitamin D. Conclusions: Elevated leptin level is associated with lower bone turnover independent of its effects on serum PTH in kidney transplant recipients. Clin J Am Soc Nephrol 5: 2297-2304, 2010. doi: 10.2215/CJN.03520410
Original languageEnglish
Pages (from-to)2297-2304
JournalClinical journal of the American Society of Nephrology
Issue number12
Publication statusPublished - Dec 2010

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