Factor de crecimiento fibroblástico 23 (FGF 23) y metabolismo fosfocálcico en la enfermedad renal crónica / Fibroblast growth factor 23 (FGF 23) and phosphocalcic metabolism in chronic kidney disease

Introducción y objetivos: A pesar de disponer de una información limitada, el conocimiento de los niveles relativos del factor de crecimiento fibrobástico 23 (FGF 23), fosfato (P), calcio (Ca), paratohormona intacta (PTHi) y 25/1,25 vitamina D3 en cada momento evolutivo de la insuficiencia renal crónica ha aportado datos para sustituir o al menos modificar antiguos paradigmas. Se definen estadios más precoces, se señalan amplias implicaciones pronósticas y se sugieren nuevas intervenciones terapéuticas. Planteamos un estudio transversal-descriptivo y analítico de estos parámetros en una amplia muestra de enfermos distribuidos en todo el espectro de la enfermedad renal crónica. Material y métodos: Evaluamos los niveles de FGF 23 con un ELISA de segunda generación que mide molécula intacta (Kainos Laboratories, Japón) en un diseño transversal de una población adulta con todos los estadios de la enfermedad renal crónica basados en CKD-EPI junto a niveles de Ca, P, paratohormona y metabolitos de la vitamina D. Resultados: Estudiamos a 251 enfermos (146 hombres y 77 mujeres) con una edad promedio de 62,5 (desviación estándar [DE]: 11,5) años, siendo el 43% de ellos diabéticos. Los niveles de FGF 23 aumentan progresivamente; este cambio es significativo en el estadio 4 en relación con el 1 (110,61 vs. 31,32 ng/l). La PTHi muestra un comportamiento similar. La 1,25 vitamina D baja (..) (AU)

Background and Objectives: The ample information available in relation to FGF 23, calcium, phosphorus, PTH, and 25/1,25 vitamin D has allowed us to define consistent values for each variable in each stage of chronic kidney disease (CKD). These values can define early stages, prognostic issues, and new treatment targets. We describe a cross-sectional study of these parameters in patients with different stages of CKD. Method: We measured FGF 23 by ELISA (intact molecule, Kainos Laboratory, Japan), calcium, phosphorus, PTH and vit D by standard methods. Results: We examined 251 patients, 146 of which were men, with a mean age of 62.5 (11.5) years and 43% prevalence of type II DM. Levels of FGF 23 rose progressively, in a very significant manner, in correlation with the evolution of CKD, especially in stage 4 as compared to stage 1 (110.61ng/L vs 31.32ng/L). The same happened with iPTH values. Additionally, levels of 1,25 vitamin D decreased in a similar manner. Calcium values did not change. 25 vit D3 levels were low at all times and showed no tendency for a steady decline. Phosphorus rose in stage 4 CKD. Levels of FGF 23 were negatively correlated with renal function indicators and positively correlated with PTH and P. Conclusions: During the evolution of CKD, changes of FGF 23 and PTH would be the earliest markers. Calcium and 25 vit D3 do not vary with changes in the progression of CKD. Values of FGF 23 show an important correlation with PTH, 1,25 vit D3, P and estimated glomerular filtration rate (AU)

Fibroblast growth factor 23 (FGF 23) and phosphocalcic metabolism in chronic kidney disease.

BACKGROUND AND OBJECTIVES: The ample information available in relation to FGF 23, calcium, phosphorus, PTH, and 25/1,25 vitamin D has allowed us to define consistent values for each variable in each stage of chronic kidney disease (CKD). These values can define early stages, prognostic issues, and new treatment targets. We describe a cross-sectional study of these parameters in patients with different stages of CKD. METHOD: We measured FGF 23 by ELISA (intact molecule, Kainos Laboratory, Japan), calcium, phosphorus, PTH and vit D by standard methods. RESULTS: We examined 251 patients, 146 of which were men, with a mean age of 62.5 (11.5) years and 43% prevalence of type II DM. Levels of FGF 23 rose progressively, in a very significant manner, in correlation with the evolution of CKD, especially in stage 4 as compared to stage 1 (110.61 ng/L vs 31.32 ng/L). The same happened with iPTH values. Additionally, levels of 1,25 vitamin D decreased in a similar manner. Calcium values did not change. 25 vit D3 levels were low at all times and showed no tendency for a steady decline. Phosphorus rose in stage 4 CKD. Levels of FGF 23 were negatively correlated with renal function indicators and positively correlated with PTH and P. CONCLUSIONS: During the evolution of CKD, changes of FGF 23 and PTH would be the earliest markers. Calcium and 25 vit D3 do not vary with changes in the progression of CKD. Values of FGF 23 show an important correlation with PTH, 1,25 vit D3, P and estimated glomerular filtration rate.