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19 February 2020 : Animal Research  

Role of Ca²⁺ in Inhibiting Ischemia-Induced Apoptosis of Parathyroid Gland Cells in New Zealand White Rabbits

Wei-han Cao1ABCDEF, Yan-jun Su2AG, Nian-qiu Liu3BCDF, Ying Peng4BD, Chang Diao4F, Ruo-chuan Cheng2A*

DOI: 10.12659/MSM.920546

Med Sci Monit 2020; 26:e920546

Abstract

BACKGROUND: Hypoparathyroidism is a common complication after thyroidectomy. Calcium supplementation can relieve these symptoms, but it is not clear whether it can protect the parathyroid glands. This study aimed to verify whether Ca²⁺ inhibits the apoptosis of parathyroid cells following ischemic injury.

MATERIAL AND METHODS: A rabbit model of parathyroid gland ischemic injury was established. The blood calcium concentrations were measured by colorimetry. The parathyroid hormone (PTH) levels were measured by enzyme-linked immunosorbent assay (ELISA). The parathyroid tissues were observed by hematoxylin and eosin (H&E) staining and the TdT-mediated dUTP nick-end labeling (TUNEL) assay. Western blotting was used to quantify the levels of the following proteins: caspase-3 and p38 MAP Kinase (p38 MAPK).

RESULTS: This study demonstrates that apoptosis can be a part of the pathological changes associated with parathyroid ischemic injury. Calcium supplementation inhibited the apoptosis of parathyroid cells following ischemic injury. There were no significant differences among the serum calcium levels from the Sham operation (Sham), the Control group (CG), or the Calcium supplementation group (CSG) after 24 h, 72 h, and 168 h of treatment. PTH levels in the CG were significantly higher than in the CSG at 24 h and 72 h after treatments. The apoptosis rate of parathyroid cells from rabbits in the CSG was significantly lower than that of those from rabbits in the CG at 24 h and 72 h after the treatment. Calcium supplementation inhibited p38 MAPK and caspase-3 expression.

CONCLUSIONS: This study demonstrates that calcium supplementation inhibited the apoptosis of parathyroid cells following ischemic injury.

Keywords: Apoptosis, Calcium, Ischemia, Parathyroid Glands, Caspase 3, Parathyroid Hormone, Rabbits

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750