Effects of RNA M6A demethylase ALKBH5 gene deficiency on morphology and function of cerebellum in aged mice / 中华病理学杂志

Objective: To investigate the effects of RNA m6A demethylase ALKBH5 gene deficiency on cerebellar morphology and function in the aged mice, and to explore the role of ALKBH5 in cerebellar degeneration. Methods: Western blot was performed to detect the protein level of ALKBH5 in the cerebellum of wild-type mice of various ages. The expression of NeuN, Calbindin-D28K, MAP2, GFAP and other proteins in the cerebella of middle-aged (12-month-old) and aged (18-month-old) wild-type mice and ALKBH5-/- mice was examined using immunohistochemistry. The balance beam test and gait analysis were performed to test the balance ability and motor coordination of the mice. Results: With aging of the mice, the expression of ALKBH5 in the cerebellum increased gradually in an age-dependent manner. In the aged mice, but not middle-aged mice, the body weight, whole brain weight and cerebellum weight of ALKBH5-/- mice decreased by 15%, 10% and 21%, respectively (P<0.05). The expression of ALKBH5 in the Purkinje cells was much higher than that in other types of neural cells. Correspondingly, ALKBH5-deficiency caused 40% reduction in the number of Purkinje cells, as well as the length and density of neuronal dendrites in the aged mice (P<0.01). In addition, the time for the aged ALKBH5-/- mice to pass the balance beam was 70% longer than that of the wild type mice of the same age, with unstable gaits (P<0.01). Conclusions: Gene deficiency of RNA m6A demethylase ALKBH5 causes cerebellar atrophy, Purkinje neuron loss and damage in the aged mice. These changes eventually affect mice's motor coordination and balance ability. These results suggest that imbalanced RNA m6A methylation may lead to neurodegenerative lesions in the cerebellum of mice.

Dissolution detection of desogestrel and ethinylestradiol tablets by HPLC / 国际药学研究杂志

Objective To develop a HPLC method for determining the dissolution of desogestrel and ethinylestradiol tablets. Methods The dissolution was determined by the second method described in Chinese Pharmacopoeia (ChP) 2015. In total 500 ml of 0.05% sodium lauryl sulfate solution was used as dissolution media, and the rotation speed was 50 r/min. The dissolution time was 30 min and the dissolution was determined by HPLC. The HPLC column was Agilent SB C18 column (150 mm×4.6 mm, 5 µm). The mobile phase: acetonitrile as mobile phase A, acetonitrile-water (50:50, V/V) as mobile phase B with gradient elution. The flow rate was 1 ml/min. The detection wavelength of desogestrel and ethinylestradiol was 210 nm. The column temperature was 40 and the injection volume was 100 µl. Results The average recoveries were 99.68% for desogestrel and 99.40% for ethinylestrsdiol, and the stability of working solutions was acceptable in 12 h. The calibration curves were linear within the range of(0.06-0.36)µg/ml (r=0.9999)for desogestrel, (0.012-0.072)µg/ml (r=0.9999)for ethinylestradiol, respectively. Conclusion The method is convenient and precise in the dissolution determination of desogestrel and ethinylestradiol tablets.

Serum ferritin in donors with regular plateletpheresis / 中国实验血液学杂志

This study was aimed to evaluate the impact of regular donating platelets on serum ferritin (SF) of donors. A total of 93 male blood donors including 24 initial plateletpheresis donors and 69 regular plateletpheresis donors were selected randomly. Their SF level was measured by ELISA. The results showed that the SF level of initial plateletpheresis donors and regular plateletpheresis donors were 91.08 ± 23.38 µg/L and 57.16 ± 35.48 µg/L respectively, and all were in normal levels, but there was significant difference between the 2 groups (p < 0.05). The SF level decreased when the donation frequency increased, there were no significant differences between the groups with different donation frequency. Correlation with lifetime donations of platelets was not found. It is concluded that regular plateletpheresis donors may have lower SF level.