Transcriptome analysis reveals that hydrogen sulfide exposure suppresses cell proliferation and induces apoptosis through ciR-PTPN23/miR-15a/E2F3 signaling in broiler thymus.

The immune organs, like thymus, are one of the targets of hydrogen sulfide (H2S). Previously we reported that H2S induced the differential expression of mRNAs that implicating apoptosis in thymus, however, the roles of noncoding RNAs (ncRNAs) in H2S-induced thymus injury are still unknown. Pollution gases could alter the expression of ncRNAs, which have been shown to play important roles in many physiological and pathophysiological processes, including immune activity. This study revealed that H2S exposure induced 9 differentially expressed circRNAs and 15 differentially expressed miRNAs in chicken thymus. Furthermore, the circRNA - miRNA - mRNA network was constructed. We discovered that circR-PTPN23 - miR-15a - E2F3 was involved in the cell cycle and apoptosis. Further, an in vitro H2S exposure model was established using HD11 cell line and demonstrated that H2S suppressed cell proliferation and induced apoptosis. Moreover, ciR-PTPN23 and E2F3 were downregulated, but miR-15a was upregulated in both the thymus and HD11 cell line after H2S exposure. Bioinformatics analysis revealed that ciR-PTPN23 directly bound to miR-15a and that E2F3 was the target gene of miR-15a. Knocking down ciR-PTPN23 suppressed HD11 proliferation and caused G1 arrest and apoptosis, however, this phenomenon could be partially reversed by ciR-PTPN23 overexpression or miR-15a silencing. In summary, the ciR-PTPN23 - miR-15a - E2F3 axis was involved in H2S-induced cell proliferation suppression and apoptosis.

Regulation of H2S-induced necroptosis and inflammation in broiler bursa of Fabricius by the miR-15b-5p/TGFBR3 axis and the involvement of oxidative stress in this process.

Hydrogen sulfide (H2S) is an air pollutant, having toxic effects on immune system. Necroptosis has been discussed as a new form of cell death and plays an important role in inflammation. To investigate the mechanism of H2S-induced immune injury, and the role of microRNAs (miRNAs) in this process, based on the results of high-throughput sequencing, we selected the most significantly changed miR-15b-5p for subsequent experiments. We further predicted and determined the targeting relationship between miR-15b-5p and TGFBR3 in HD11 through miRDB, Targetscan and dual-luciferase, and found that miR-15b-5p is highly expressed in H2S-induced necroptosis and inflammation. To understand whether miR-15b-5p/TGFBR3 axis could involve in the process of necroptosis and inflammation, we further revealed that the high expression of miR-15b-5p and the knockdown of TGFBR3 can induce necroptosis. Nec-1 treatment enhanced the survival rate of cells. Notably, H2S exposure induces oxidative stress and activates the TGF-ß pathway, which are collectively regulated by the miR-15b-5p/TGFBR3 axis. Our present study provides a new perspective for necroptosis regulated by the miR-15b-5p/TGFBR3 axis and reveals a new form of inflammation regulation in immune diseases.

Effects of Astragali Radix Injection Combined with Entecavir on Serum Inflammatory Cytokines and Liv-er Function of Model Mice with Hepatitis B / 中国药房

OBJECTIVE:To study the effects of Astragali radix injection combined with entecavir on serum inflammatory cyto-kines and liver function of model mice with hepatitis B. METHODS:60 mice were randomly divided into normal control group (normal saline),model group (normal saline),Astragali radix injection group (0.5 mL/10 g),entecavir group (45 μg/kg) and combination group(0.5 mL/10 g Astragali radix injection+45 μg/kg entecavir),12 in each group. Except for normal control group, mice in other 4 groups were induced for hepatitis B models. After modeling,all mice were intragastrically administrated once a day,for 4 weeks. After administration,tumor necrosis factor α(TNF-α),interferon γ(IFN-γ),interleukin 8 (IL-8),aspartate aminotransferase(AST),alanine aminotransferase(ALT),total bilirubin(TBIL)levels in serum were detected,and the pathologi-cal changes in liver tissue in each group were observed. RESULTS:Compared with normal control group,TNF-α,IFN-γ,IL-8, AST,ALT,TBIL levels in serum of mice in model group were significantly increased(P<0.05);and liver cells were diffuse and severe steatosis. Compared with model group,TNF-α,IFN-γ,IL-8,AST,ALT,TBIL levels in serum of mice in each administra-tion group were significantly decreased(P<0.05),pathological changes in liver tissue were improved to varying degrees,and the index improvement degree in combination group was superior to Astragali radix injection group and entecavir group (P<0.05). CONCLUSIONS:Astragali radix injection combined with entecavir helps to down-regulate the expressions of inflammatory cyto-kines of model mice with hepatitis B,and improve the liver function. The combination use has better effect than single use.

Pharmacokinetics and bioequivalence assessment of a self-assembled asparaginase nanocapsule in rats / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the pharmacokinetics and bioequivalence of asparaginase loaded in hyaluronic acid-graft-poly(ethylene glycol)/ sulfobutylether-β-cyclodextrin nanocapsules (AHSP) in SD rats.</p><p><b>METHODS</b>The morphology of AHSP was observed under the transmission electron microscope and the particle size and zeta potential were measured. AHSP and free asparaginase were intravenously injected in rats, and the plasma asparaginase activity was measured at different time points after the injections. The pharmacokinetic parameters were calculated using the software DAS 2.1.1 to assess the bioequivalence of AHSP and free asparaginase.</p><p><b>RESULTS</b>AHSP had an average particle size of 413.80∓10.97 nm with a zeta potential of -20.37∓2.38 mV. The AUC(0-48 h) of AHSP and free asparaginase was 137.34∓1.82 U/mL and 46.38 ∓1.98 U/mL, and their AUC(0-∞) was 164.66∓6.88 U/mL and 51.44∓3.01 U/mL with half-lives of 4.62∓0.60 h and 1.86∓0.38 h, respectively. Compared with free AN, AHSP exhibited increased AUC(0-48 h), AUC(0-∞), and half-life by 2.24, 2.55 and 2.32 folds, respectively. The 90% confidential intervals of AUC(0-48 h), AUC(0-∞) and Cmax of the tested formulation were 75.0%-76.5%, 74.3%-76.1%, and 95.1%-96.7%, respectively.</p><p><b>CONCLUSION</b>AHSP can improve the bioavailability and extend the biological half-life of asparaginase in rats, and AHSP and free asparaginase are not bioequivalent.</p>

Initial Study of Teaching Reform for Experimental Teaching of Medical Chemistry / 中华医学教育探索杂志

In this article,combined with teaching practice for recent years,we have surveyed the teaching reform about experimental teaching of medical chemistry and proposed some advice for the experimental teaching reform.

The Practice and Exploration of Teaching Reform on Medical Chemistry Experiment / 中华医学教育探索杂志

A series of reforms on the teaching of medical chemistry experiment has been carried out to arouse students' interest in medical chemistry experiment study and improve the quality of instruction,which includes the content of course,the teaching method and the inspection method.Good results have been achieved in the aspect of development of students' comprehensive quality,which lays a good foundation for the study of other courses.

How to actualize the ideological and political education in chemistry teaching / 中华医学教育探索杂志

In this paper,the significance of ideological and political education was stated based on the ideological and political status of contemporary college students and the methods of teaching how to actualize the ideological and political education in chemistry teaching were in depth explored.

The Exploration and Practice of PBL Teaching Method in Medical Organic Chemistry / 中华医学教育探索杂志

In order to improve teaching quality of medical organic chemistry,problem-based learning was introduced.The characteristic,implementary process and outlines of problem-based learning were discussed in combination with the characteristic of organic chemistry in medical university.

How to Actualize Teaching in Green Chemistry in Medical Chemistry Experiment / 中华医学教育探索杂志

The significance and method of green chemistry teaching are expounded in detail during the course of medical chemistry experiment,and a new experiment system of green chemistry suiting with medicine is designed in the paper.

A Tentative Discussion and Thought on Bilingual Teaching in the Experimental Course of Organic Chemistry / 中华医学教育探索杂志

Combined with teaching practice,we have summarized some experiences about bilingual teaching in the experimental course of organic chemistry and proposed some advice for the bilingual teaching.