PMID- 32570711 OWN - NLM STAT- MEDLINE DCOM- 20210215 LR - 20211204 IS - 1422-0067 (Electronic) IS - 1422-0067 (Linking) VI - 21 IP - 12 DP - 2020 Jun 18 TI - Parathyroid Cell Proliferation in Secondary Hyperparathyroidism of Chronic Kidney Disease. LID - 10.3390/ijms21124332 [doi] LID - 4332 AB - Secondary hyperparathyroidism (SHP) is a common complication of chronic kidney disease (CKD) that correlates with morbidity and mortality in uremic patients. It is characterized by high serum parathyroid hormone (PTH) levels and impaired bone and mineral metabolism. The main mechanisms underlying SHP are increased PTH biosynthesis and secretion as well as increased glandular mass. The mechanisms leading to parathyroid cell proliferation in SHP are not fully understood. Reduced expressions of the receptors for calcium and vitamin D contribute to the disinhibition of parathyroid cell proliferation. Activation of transforming growth factor-alpha-epidermal growth factor receptor (TGF-alpha-EGFR), nuclear factor kappa B (NF-kB), and cyclooxygenase 2- prostaglandin E2 (Cox2-PGE2) signaling all correlate with parathyroid cell proliferation, underlining their roles in the development of SHP. In addition, the mammalian target of rapamycin (mTOR) pathway is activated in parathyroid glands of experimental SHP rats. Inhibition of mTOR by rapamycin prevents and corrects the increased parathyroid cell proliferation of SHP. Mice with parathyroid-specific deletion of all miRNAs have a muted increase in serum PTH and fail to increase parathyroid cell proliferation when challenged by CKD, suggesting that miRNA is also necessary for the development of SHP. This review summarizes the current knowledge on the mechanisms of parathyroid cell proliferation in SHP. FAU - Naveh-Many, Tally AU - Naveh-Many T AUID- ORCID: 0000-0002-0903-8182 AD - Minerva Center for Calcium and Bone Metabolism, Nephrology Services, Hadassah Hebrew University Medical Center, Jerusalem 91120, Israel. AD - The Wohl Institute for Translational Medicine, Hadassah Hebrew University Medical Center, Jerusalem 91120, Israel. FAU - Volovelsky, Oded AU - Volovelsky O AUID- ORCID: 0000-0002-5378-1045 AD - The Wohl Institute for Translational Medicine, Hadassah Hebrew University Medical Center, Jerusalem 91120, Israel. AD - Pediatric Nephrology Unit and Research Lab, Hadassah Hebrew University Medical Center, Jerusalem 91120, Israel. LA - eng PT - Journal Article PT - Review DEP - 20200618 PL - Switzerland TA - Int J Mol Sci JT - International journal of molecular sciences JID - 101092791 RN - 0 (FGF23 protein, human) RN - 0 (Fgf23 protein, mouse) RN - 0 (Receptors, Calcitriol) RN - 0 (Receptors, Calcium-Sensing) RN - 7Q7P4S7RRE (Fibroblast Growth Factor-23) SB - IM MH - Cell Proliferation MH - Down-Regulation MH - Fibroblast Growth Factor-23 MH - Humans MH - Hyperparathyroidism, Secondary/etiology/*metabolism/pathology MH - Parathyroid Glands/metabolism/*pathology MH - Receptors, Calcitriol/metabolism MH - Receptors, Calcium-Sensing/metabolism MH - Renal Insufficiency, Chronic/*complications/metabolism PMC - PMC7352987 OTO - NOTNLM OT - calcium-sensing receptor (CaSR) OT - fibroblast growth factor (FGF23) OT - mammalian target of rapamycin (mTOR) OT - parathyroid hormone (PTH) OT - uremia OT - vitamin D receptor (VDR) COIS- The authors declare no conflict of interests. EDAT- 2020/06/24 06:00 MHDA- 2021/02/16 06:00 PMCR- 2020/06/01 CRDT- 2020/06/24 06:00 PHST- 2020/05/17 00:00 [received] PHST- 2020/06/14 00:00 [revised] PHST- 2020/06/15 00:00 [accepted] PHST- 2020/06/24 06:00 [entrez] PHST- 2020/06/24 06:00 [pubmed] PHST- 2021/02/16 06:00 [medline] PHST- 2020/06/01 00:00 [pmc-release] AID - ijms21124332 [pii] AID - ijms-21-04332 [pii] AID - 10.3390/ijms21124332 [doi] PST - epublish SO - Int J Mol Sci. 2020 Jun 18;21(12):4332. doi: 10.3390/ijms21124332.