Hyperoside protects mouse spermatocytes GC-2 cells from oxidative damage by activating the Keap1/Nrf2/HO-1 pathway / 南方医科大学学报

OBJECTIVE@#To study the protective effect of hyperoside (Hyp) against ydrogen peroxide (H2O2)- induced oxidative damage in mouse spermatocytes GC-2 cells and explore the role of the Keap1/Nrf2/HO-1 pathway in this protective mechanism.@*METHODS@#GC-2 cells were treated with 2.5 mmol/L azaacetylcysteine (NAC), 50, 100, and 200 μmol/L hyperoside, or the culture medium for 48 h before exposure to H2O2 (150 μmol/L) for 2 h. CCK-8 assay was used to detect the changes in cell viability, and cell apoptosis was analyzed using flow cytometry. Enzyme-linked immunosorbent assay (ELISA) was used to detect the levels of superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), catalase (CAT) activity and malondialdehyde (MDA) in the culture medium. Western blotting and RT-qPCR were used to detect the protein and mRNA expression levels of nuclear factor erythroid 2-related factor2 (Nrf2), Kelch-like ECH-associated protein 1 (Keap1), and heme oxygenase-1 (HO-1); the nuclear translocation of Nrf2 was detected using immunofluorescence assay.@*RESULTS@#Exposure to H2O2 significantly lowered the proliferation rate, reduced the activities of SOD, GSH and CAT, and obviously increased MDA content, cell apoptosis rate, and the expressions of Keap1 and Nrf2 mRNA and Keap1 protein in GC-2 cells (P < 0.05 or 0.01). Treatment of the cells prior to H2O2 exposure with either NAC or 200 μmol/L hyperoside significantly increased the cell proliferation rate, enhanced the activities of SOD, GSH-PX and CAT, and lowered MDA content and cell apoptosis rate (P < 0.05). Treatment with 200 μmol/L hyperoside significantly decreased the mRNA and protein expressions of Keap1 and increased the expressions of HO-1 mRNA and the protein expressions of Nrf2 and HO-1 (P < 0.05 or 0.01). Hyperoside also caused obvious nuclear translocation of Nrf2 in the cells (P < 0.05).@*CONCLUSION@#Hyperoside protects GC-2 cells against H2O2- induced oxidative damage possibly by activation of the Keap1/Nrf2/HO-1 signaling pathway.

Study on the mechanism of Wuzi-Yanzong-Wan-medicated serum interfering with the mitochondrial permeability transition pore in the GC-2 cell induced by atractyloside / 中国天然药物

Wuzi-Yanzong-Wan (WZYZW) is a classic prescription for male infertility. Our previous investigation has demonstrated that it can inhibit sperm apoptosis via affecting mitochondria, but the underlying mechanisms are unclear. The purpose of the present study was to explore the actions of WZYZW on mitochondrial permeability transition pore (mPTP) in mouse spermatocyte cell line (GC-2 cells) opened by atractyloside (ATR). At first, WZYZW-medicated serum was prepared from rats following oral administration of WZYZW for 7 days. GC-2 cells were divided into control group, model group, positive group, as well as 5%, 10%, 15% WZYZW-medicated serum group. Cyclosporine A (CsA) was used as a positive control. 50 μmol·L-1 ATR was added after drugs incubation. Cell viability was assessed using CCK-8. Apoptosis was detected using flow cytometry and TUNEL method. The opening of mPTP and mitochondrial membrane potential (MMP) were detected by Calcein AM and JC-1 fluorescent probe respectively. The mRNA and protein levels of voltage-dependent anion channel 1 (VDAC1), cyclophilin D (CypD), adenine nucleotide translocator (ANT), cytochrome C (Cyt C), caspase 3, 9 were detected by RT-PCR (real time quantity PCR) and Western blotting respectively. The results demonstrated that mPTP of GC-2 cells was opened after 24 hours of ATR treatment, resulting in decreased MMP and increased apoptosis. Pre-protection with WZYZ-medicated serum and CsA inhibited the opening of mPTP of GC-2 cells induced by ATR associated with increased MMP and decreased apoptosis. Moreover, the results of RT-qPCR and WB suggested that WZYZW-medicated serum could significantly reduce the mRNA and protein levels of VDAC1 and CypD, Caspase-3, 9 and CytC, as well as a increased ratio of Bcl/Bax. However, ANT was not significantly affected. Therefore, these findings indicated that WZYZW inhibited mitochondrial mediated apoptosis by attenuating the opening of mPTP in GC-2 cells. WZYZW-medicated serum inhibited the expressions of VDAC1 and CypD and increased the expression of Bcl-2, which affected the opening of mPTP and exerted protective and anti-apoptotic effects on GC-2 cell induced by ATR.

Clinical Characteristics and Bone Marrow Histopathology Features in Essential Thrombocythaemia Patients with Different Gene Mutation in China / 中国实验血液学杂志

OBJECTIVE@#To investigate the clinical characteristics, laboratorial and bone marrow pathological features of primary thrombocytopenia (ET) patients with different mutations of CALR, JAK2 and MPL genes.@*METHODS@#The chinical data of 120 cases of ET in Jiangsu provincial people's hospital/ The First Affiliated Hospital of Nanjing Medical University from January 2015 to December 2017 were collected and analyzed, including 76 cases with JAK2 gene mutation, 40 cases with CALR gene mutation, 2 cases with MPL gene mutations, 2 cases without gene mutation.@*RESULTS@#Among the ET patients, compared with the JAK2 gene mutation, CALR gene mutation showed statistically significant deareament of white blood cells and hemoglobin (P=0.001, P=0.01) and the male platelets in CALR group showed significant increament (P=0.04). Fourthermore, the average number of megakaryocytes and its cluster numbers in each hight power field of vision showed statistically significant decreament in CALR group as compared with JAK2 group (P=0.001, P=0.001), and thrombotic events in CALR group were signicantly lower than those in JAK2 group (7.5% vs 18.4%) (P=0.03).@*CONCLUSION@#Mutations of CALR, JAK2 have different clinical characteristics and blood pathological changes of Chinese ET patients, and their clinical significance is worth to explore.

Effect of Wuzi Yanzong Wan on Sperm Apoptosis by Intervening with Mitochondrial Permeability Transition Pore / 中国实验方剂学杂志

Objective:To study the effect of Wuzi Yanzong Wan on the expressions of voltage-dependent anion channel 1 （VDAC1）， adenine nucleotide transposase （ANT）， cyclophilin D （CypD） and other proteins， and analyze its mechanism in intervening with sperm mitochondrial permeability transition pore （mPTP） opening. Method:Forty rats were randomly divided into 4 groups， namely normal group， model group， positive group （Shengjing capsule， 1.6 g·kg-1·d-1）， and Wuzi Yanzong Wan group （4.0 g·kg-1·d-1）， with 10 rats in each group. Except for the normal group， tripterygium wilfordii glycosides （GTW， 30 mg·kg-1） was intragastrically administered for 8 weeks to establish the oligozoospermia model. After the 4th week， each group was given drugs through intragastric administration for 4 weeks， and fasted for 12 h after the last administration. These rats were anesthetized with 3% chloral hydrate， and their testis and epididymis tissues were collected. Western blot was used to determine the protein expressions of VDAC1，ANT，CypD，B-cell lymphoma/leukemia2 （Bcl-2）， Bcl-2 associated X protein （Bax）， Caspase-3， Caspase-9 in rat testis， Testicular tissue and its ultrastructure were observed under electron microscopy. The apoptosis in spermatogenic cells was detected by terminal-deoxynucleoitidyl transferase mediated nick end labeling （TUNEL）. Result:Western blot results showed that compared with the normal group， the expressions of VDAC1， CypD， Caspase-3， Caspase-9 and Bax/Bcl-2 in the model group were increased （P<0.01）. The expressions of VDAC1， CypD， Caspase-3， Caspase-9 and Bax/Bcl-2 were significantly decreased in the positive group and the Wuzi Yanzong Wan group compared with the model group （P<0.01）. There was no significant change in the expressions of ANT and Bcl-2 protein between the groups. Testicular ultrastructural evaluation showed different sizes and disordered arrangement of sperm mitochondria and a large number of swelling and vacuoles in the model group， while complete structure and neat arrangement of sperm mitochondria and much less swelling and vacuole in positive group and Wuzi Yanzong Wan group. TUNEL results showed that the apoptosis rate of spermatogenic cells in the model group was significantly higher than that of the normal group （P<0.01）， while the apoptosis rate in the positive drug and Wuzi Yanzong Wan group was significantly lower than that of the model group （P<0.01）. Conclusion:Wuzi Yanzong Wan may resist germ cell apoptosis by inhibiting the expressions of VDAC1， CypD and Bax， reducing the permeability of mPTP， and preventing the cascade activation reaction of the Caspase family of apoptosis proteins.

MRI Histogram Texture Feature Analysis of the Optic Nerve in the Patients with Optic Neuritis / 中国医学科学杂志(英文版)

Objective To evaluate the optic nerve impairment using MRI histogram texture analysis in the patients with optic neuritis.Methods The study included 60 patients with optic neuritis and 20 normal controls. The coronal T2 weighted imaging (T2WI) with fat saturation and enhanced T1 weighted imaging (T1WI) were performed to evaluate the optic nerve. MRI histogram texture features of the involved optic nerve were measured on the corresponding coronal T2WI images. The normal optic nerve (NON) was measured in the posterior 1/3 parts of the optic nerve. Kruskal-Wallis one-way ANOVA was used to compare the difference of texture features and receiver operating characteristic (ROC) curve were performed to evaluate the diagnostic value of texture features for the optic nerve impairment among the affected optic nerve with enhancement (ONwEN), affected optic nerve without enhancement (ONwoEN), contralateral normal appearing optic nerve (NAON) and NON.Results The histogram texture Energy and Entropy presented significant differences for ONwEN vs. ONwoEN (both P=0.000), ONwEN vs. NON (both P=0.000) and NAON vs. NON (both P<0.05). ROC analysis demonstrated that the area under the curve (AUC) of histogram texture Energy were 0.758, 0.795 and 0.701 for ONwEN vs. ONwoEN, ONwEN vs. NON and NAON vs. NON, AUC of Entropy were 0.758, 0.795 and 0.707 for ONwEN vs. ONwoEN, ONwEN vs. NON and NAON vs. NON.Conclusions The altered MRI histogram texture Energy and Entropy could be considered as a surrogate for MRI enhancement to evaluate the involved optic nerve and normal-appearing optic nerve in optic neuritis.

Determination of beta-endorphin in hypothalamus of rat with primary trigeminal neuralgia / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To determine the level and the role of beta-endorphin in hypothalamus of rat with trigeminal neuralgia.</p><p><b>METHODS</b>The animal model of primary trigeminal neuralgia in rat was established, the contents of beta-endorphin were measured by radioimmunoassay techniques.</p><p><b>RESULTS</b>The beta-endorphin of hypothalamus in experimental group was significantly lower than other groups (P < 0.01).</p><p><b>CONCLUSIONS</b>Beta-endorphin may play important roles in primary trigeminal neuralgia.</p>

Purification and Biological Characteristics of Bacteriocin-like Substance Produced by Lactobacillus buchneri KLDS1.0364 / 微生物学通报

The purpose of this study is to obtain effective and stable bacteriocin-like substance from lactic acid bacteria. Lactobacillus buchneri KLDS1.0364,which was isolated from fermented cream,a traditional dairy product in Inner Mongolia,could produce bacteriocin-like substance. The bacteriocin-like substance produced by KLDS1.0364 was partially purified and the characteristics were studied. The bacteriocin-like substance was purified by SP-Sepharose fast flow cation exchange chromatography. The molecular weight of the bacteriocin-like substance was 21.6kD,as determined by tricine-SDS-PAGE. The bacteriocin-like substance remained stable after 30 min at 121℃ and after 2 h of incubation during pH 2～10. Complete inactivation of antimicrobial activity was observed after treatment of the bacteriocin-like substance with several proteinases. Treatment with catalase and ?-amylase did not result in any changes of antimicrobial activity. The mode of action of the bacteriocin-like substance is bactericidal. It exhibited a broad spectrum of antagonistic activity against various species of Gram-positive bacteria,Gram-negative bacteria and fungi.