RT Generic T1 Hyporesponsiveness or resistance to the action of parathyroid hormone in chronic kidney disease A1 Bover, Jordi A1 Arana, Carolt A1 Urena, Pablo A1 Torres, Armando A1 Martin-Malo, Alejandro A1 Fayos, Leonor A1 Coll, Veronica A1 Jesus Lloret, Maria A1 Ochoa, Jackson A1 Almaden, Yolanda A1 Guirado, Lluis A1 Rodriguez, Mariano K1 Parathyroid hormone K1 Parathyroid hormone receptor K1 Chronic kidney disease-mineral and bone disorder K1 Secondary hyperparathyroidism K1 Parathyroid hormone resistance K1 Phosphate K1 Calcium K1 Calcaemic response K1 Calcium-sensing receptor K1 Abnormal skeletal response K1 Adynamic bone-disease K1 Chronic-renal-failure K1 Pth-pthrp receptor K1 Secondary hyperparathyroidism K1 Calcemic response K1 Circulating levels K1 Cardiovascular calcifications K1 Dialysis patients AB Secondary hyperparathyroidism (SHPT) is an integral component of the chronic kidney disease-mineral and bone disorder (CKD-MBD). Many factors have been associated with the development and progression of SHPT but the presence of skeletal or calcemic resistance to the action of PTH in CKD has often gone unnoticed. The term hyporesponsiveness to PTH is currently preferred and, in this chapter, we will not only review the scientific timeline but also some of the molecular mechanisms behind. Moreover, the presence of resistance to the biological action of PTH is not unique in CKD since resistance to other hormones has also been described ("uremia as a receptor disease"). This hyporesponsiveness carries out important clinical implications since it explains, at least partially, not only the progressive nature of the pathogenesis of CKD-related PTH hypersecretion and parathyroid hyperplasia but also the increasing prevalence of adynamic bone disease in the CKD population. Therefore, we underline the importance of PTH control in all CKD stages, but not aiming to completely normalize PTH levels since a certain degree of SHPT may represent an adaptive clinical response. Future studies at the molecular level, i.e. on uremia or the recent description of the calcium-sensing receptor as a phosphate sensor, may become of great value beyond their significance to explain just the hyporesponsiveness to PTH in CKD. (C) 2021 Sociedad Espanola de Nefrologia. Published by Elsevier Espana, S.L.U. PB Soc espanola nefrologia dr rafael matesanz SN 0211-6995 YR 2021 FD 2021-09-01 LK https://hdl.handle.net/10668/25821 UL https://hdl.handle.net/10668/25821 LA en DS RISalud RD Apr 8, 2025