Objective To establish and evaluate the CaV1?1?R528H gene knock?in mouse model of thyrotoxic hy?pokalemic periodic paralysis. Methods Thirty?six 8?week?old male CaV1?1?R528H gene knock?in mice and thirty?six 8?week?old wild?type male C57BL/6J mice were used in this study. Using three?factor two?level 2 × 2 × 2 factorial design ( the three factors including mutation, thyroxine and insulin, and two levels were with or without) , the mice were divided into 8 groups. The thyroxine groups were intraperitoneally injected with levothyroxine in a dose of 350 μg/kg once per day for 12 consecutive days to produce thyrotoxicosis. The insulin groups were intraperitoneally injected with short?acting insulin in a dose of 0?8 U/kg after the last administration of levothyroxine, and the potassium levels of different groups were meas?ured and recorded before (0 min) and after insulin injection (30 min, 60 min). Results (1) Compared with the control group, the following phenomena including irritability, dull coat, increased diet and water intake, and slow body weight gain, were observed in the thyrotoxic mice. Thyroid function tests showed that the levels of T3 and T4 in the thyrotoxic mice were significantly higher than those in the corresponding control mice (P<0?05), and the TSH level was significantly low?er than that of the corresponding control mice (P<0?05 ). (2) After administration of insulin or thyroxine alone, the po?tassium levels in the mutant and wild?type mice were not significantly different. However, after combined administration of thyroxine and insulin, the potassium levels in the mutant group were significantly lower than those in the wild?type mice at 30 min and 60 min ( P<0?05 for both). (3) The main effects and interactions:Mutation factor or thyroxine factor alone did not influence on the potassium level, only insulin showed hypokalemic effect (P<0?05). There were interactions be?tween thyroxine and mutation, and between insulin and mutation (P<0?05), but no interaction between thyroxine and in?sulin. Conclusions (1) A thyrotoxicosis state in mice is successfully developed in this study. (2) An CaV1?1?R528H gene knock?in mouse model of thyrotoxic hypokalemic periodic paralysis is successfully established.

Objective To investigate the activation of microglia and astrocytes, the secretion of pro-inflammatory factors, and the survival of neurons in the hippocampus of mice with acute seizures induced by pentylenetetrazol (PTZ) 24 hours after the onset of seizures. Methods Adult male C57BL/6 mice were randomly assigned to the control group and the PTZ-induced acute epileptic seizure group using random numbers, with 28 mice in each group. The activation status of microglia and astrocytes in the CA1 region of the hippocampus was evaluated by immunofluorescence 24 hours after the onset of seizures. RNA was extracted from the hippocampal tissue to detect the expression level of inflammatory factor mRNA, and HE staining was used to assess the survival of neurons in the hippocampus. Results Twenty-four hours after PTZ-induced acute seizures in mice, the numbers of activated Iba1⁺ microglia (55.72±4.29 vs 35.71±9.66, P＜0.001) and GFAP⁺ astrocytes (51.61±8.21 vs 37.64±5.27, P＜0.01) in the CA1 region were significantly increased compared with the control group; the proportion of M1 microglia was significantly increased (0.58±0.02 vs 0.35±0.08, P＜0.0001), while the proportion of M2 microglia was significantly decreased (0.25±0.08 vs 0.44±0.09，P＜0.01); the mRNA level of pro-inflammatory factor IL-1β in the hippocampus was significantly higher than that in the control group (2.49±1.61 vs 1.02±0.68, P＜0.05); the numbers of neurons in the CA1 (284.91±73.32 vs 498.88±176.79, P＜0.05) and CA3 (247.42±50.20 vs 457.78±150.08, P＜0.05) regions during the acute phase was significantly reduced compared with the control group. Conclusions Twenty-four hours after PTZ-induced acute epileptic seizures in mice, microglia and astrocytes in the CA1 region of the hippocampus are activated, with microglia mainly presenting the M1 phenotype to exert pro-inflammatory effects, secretions of pro-inflammatory factors increasing, and surviving hippocampal neurons decreasing.