Follow up analysis of 6 patients with severe trimethyltin chloride poisoning for 4 years / 中华劳动卫生职业病杂志

Objective: Objective to investigate the health changes of patients with severe trimethyltin chloride (TMT) poisoning in four years. Methods: Six patients with severe TMT poisoning treated in the First Affiliated Hospital of Gannan Medical College in August 2016 were numbered 1, 2, 3, 4, 5 and 6 respectively. The patients were followed up 0.5, 2 and 4 years after poisoning and compared and analyzed. The follow-up contents include: symptom degree, score of simple mental intelligence examination scale (MMSE) and modified Rankin Scale (MRS) , cranial magnetic resonance imaging (MRI) , EEG, etc. Results: The symptoms of dizziness, headache, chest tightness, palpitation, nausea and vomiting decreased gradually in 6 patients. The symptoms of speech disorder and memory decline in No.1, 2 and 3 patients gradually increased, and the scores of MMSE and Mrs gradually decreased; Patients No.4, 5 and 6 had improved speech disorder, but their memory decreased, MMSE and Mrs scores were still flat, and mild cognitive impairment. The brain atrophy of No.1, 2 and 3 patients was aggravated, which showed obvious atrophy of hippocampus, temporal lobe, insular lobe and cerebellum and enlargement of ventricle; There was no significant change in brain atrophy in No.4, 5 and 6 patients. Conclusion: The neurotoxic symptoms in the later stage of severe TMT poisoning are still serious, and the neurotoxic time is long.

Effect of miltirone on proliferation and apoptosis of leukemia THP-1 cells / 中国中药杂志

To investigate the toxicity and related mechanism of miltirone to human acute myeloid leukemia THP-1 cells. To be specific, the active components and targets of miltirone were retrieved from Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform(TCMSP), and the target proteins were converted into standard gene names with UniProt. Acute leukemia-rela-ted target genes were screened from GeneCards and DisGeNET. Venn diagram was constructed with Venny 2.1 to yield the common targets of the disease and the drug. The protein-protein interaction(PPI) network was constructed by STRING and Cytoscape 3.8.2. THP-1 cells in the logarithmic growth phase were treated with dimethyl sulfoxide(DMSO), and 2.5, 5, 10, 15, and 20 μmol·L~(-1) miltirone for 24 h, respectively. The proliferation rate of cells was analyzed by carboxyfluorescein diacetate succinimidyl ester(CFSE), apoptosis rate by flow cytometry with Annexin V-PE/7 AAD staining, and cell morphology by acridine orange staining. Real-time quantitative PCR(qPCR) was employed to detect the mRNA levels of nuclear receptor coactivator 2(NCOA2), poly(ADP-ribose) polymerase-1(PARP1), B-cell lymphoma-2(Bcl-2)-associated X protein(Bax), Bcl-2, and cysteine aspartyl protease-3(caspase-3). The effect of miltirone on apoptosis was detected in presence of caspase inhibitor Z-VAD-FMK. A total of 26 targets of miltirone, 1 046 genes related to acute leukemia, and 6 common targets of the two were screened out. Flow cytometry result showed miltirone at 10 μmol·L~(-1) can inhibit proliferation and promote apoptosis of THP-1 cells. The typical manifestations of apoptosis, such as cell shrinkage, nuclear rupture, and chromatin agglomerate were displayed by acridine orange staining. The decreased mRNA levels of NCOA2 and PARP1 and increased Bax/Bcl-2 ratio and the activity of pro-apoptotic protein caspase-3 were observed. Z-VAD-FMK can attenuate the apoptosis-inducing effect of miltirone. This study indicates that miltirone can inhibit the proliferation and promote the apoptosis of THP-1 cells, by down-regulating NCOA2 and PARP1, raising Bax/Bcl-2 ratio, and activating caspase-3.

Application of single incision plus one port laparoscopic surgery in radical right hemicolon cancer surgery / 中华胃肠外科杂志

Objective: To investigate the feasibility and advantages of the SILS+1 technique in the radical right hemicolectomy, by comparing the short-term efficacy, postoperative recovery of intestinal function, and stress and inflammatory response of patients with right-sided colon cancer undergoing the conventional 5-hole laparoscopic technique or the single incision plus one port laparoscopic surgery (SILS+1). Methods: A retrospective cohort study was performed. Thirty-five patients with right-sided colon cancer undergoing SILS+1 surgery at Department of Gastrointestinal Surgery of Fujian Cancer Hospital from January 2018 to September 2020 were enrolled in the SILS+1 group. Then a total of 44 patients who underwent completely 5-hole laparoscopic right hemicolectomy at the same time were selected as the conventional laparoscopic surgery (CLS) group. The intraoperative observation indexes (operative time, intraoperative blood loss, and incision length) and postoperative observation indexes (time to ambulation after surgery, time to flatus, pain score in the first 3 days after surgery, hospitalization days, number of lymph node dissections, postoperative complication morbidity, and postoperative total protein, albumin and C-reaction protein) were compared between the two groups. Results: There was no conversion to laparotomy or laparoscopic-assisted surgery in both groups. All the patients successfully completed radical right hemicolectomy under total laparoscopy. There were no statistically significant differences in gender, age, body mass index or tumor stage between the two groups (all P>0.05). Compared with the CLS group, the SILS+1 group had shorter incision length [(5.1±0.6) cm vs. (8.5±4.1) cm, t=4.124, P=0.012], shorter time to the first ambulation (median: 27.6 h vs. 49.3 h, Z=4.386, P=0.026), and shorter time to the first flatus (median:42.8 h vs. 63.2 h, Z=13.086, P=0.012), lower postoperative pain score [postoperative 1-d: 2.0 ± 1.1 vs. 3.6 ± 0.9; postoperative 2-d: 1.4 ± 0.2 vs. 2.9±1.4; postoperative 3-d: 1.1 ± 0.1 vs. 2.3±0.3, F=49.128, P=0.003), shorter postoperative hospital stay [(9.1 ± 2.7) d vs. (11.2 ± 2.2) d, t=3.267,P=0.001], which were all statistically significant (all P<0.05). On the second day after surgery, as compared to CLS group, SILS+1 group had higher total protein level [(59.7±18.2) g/L vs. (43.0±12.3) g/L, t=2.214, P=0.003], higher albumin level [(33.6±7.3) g/L vs. (23.7±5.4) g/L, t=5.845, P<0.001], but lower C-reactive protein level [(16.3 ± 3.1) g/L vs. (63.3 ± 4.5) g/L, t=4.961, P<0.001], which were all statistically significant. There were no significant differences in the operative time, intraoperative blood loss, number of harvested lymph node, number of metastatic lymph node, and postoperative complication morbidity (all P>0.05). Conclusions: The SILS+1 technique has good operability and potential for popularization. Under the premise of radical resection, this technology not only reduces incision number and postoperative physical pain, but also speeds up postoperative recovery and shortens hospital stay.

Modified Procedures for ALPPS Based on a Risk-Reduced Strategy: Paralleled Clinical Evaluation at Multiple Institutions

Purpose@#We compared the clinical outcomes of modified procedures for associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) based on a risk-reduced strategy with those of classic ALPPS procedures in treating large liver carcinoma. @*Materials and Methods@#Short-term outcomes, increases in future liver remnant (FLR) and functional FLR (FFLR), and overall survival (OS) were compared between 45 consecutive patients treated with modified ALPPS procedures and 34 patients treated with classic ALPPS procedures. @*Results@#Clinical outcomes after the 1st-stage operation markedly improved with the modified procedures. Although the proportions of liver cirrhosis and hepatocellular carcinoma were higher in the modified group, the mortality and incidence of severe complications did not increase. FLR and FFLR hypertrophy at 1 week after the 1st-stage operation were similar in both groups; however, kinetic growth rates in the modified group were lower. OS rates were similar. @*Conclusion@#Modified ALPPS procedures could be safely applied to provide long-term survival for patients with liver cirrhosis without sufficient FLR.

Modified Procedures for ALPPS Based on a Risk-Reduced Strategy: Paralleled Clinical Evaluation at Multiple Institutions

Purpose@#We compared the clinical outcomes of modified procedures for associating liver partition and portal vein ligation for staged hepatectomy (ALPPS) based on a risk-reduced strategy with those of classic ALPPS procedures in treating large liver carcinoma. @*Materials and Methods@#Short-term outcomes, increases in future liver remnant (FLR) and functional FLR (FFLR), and overall survival (OS) were compared between 45 consecutive patients treated with modified ALPPS procedures and 34 patients treated with classic ALPPS procedures. @*Results@#Clinical outcomes after the 1st-stage operation markedly improved with the modified procedures. Although the proportions of liver cirrhosis and hepatocellular carcinoma were higher in the modified group, the mortality and incidence of severe complications did not increase. FLR and FFLR hypertrophy at 1 week after the 1st-stage operation were similar in both groups; however, kinetic growth rates in the modified group were lower. OS rates were similar. @*Conclusion@#Modified ALPPS procedures could be safely applied to provide long-term survival for patients with liver cirrhosis without sufficient FLR.

Correlation of inner-retinal irregularity index with visual function before and after surgery in idiopathic macular epiretinal membrane / 中华眼底病杂志

Objective:To observe the changes of the inner-retinal irregularity index (IRII) of eyes with idiopathic macular epiretinal membrane (IMEM) before and after surgery and its correlation with visual function.Methods:retrospective series of studies. From March 2017 to May 2018, 46 IMEM patients (46 eyes) diagnosed in the Department of Ophthalmology of Central Theater Command General Hospital were included in the study. BCVA, visual deformation degree (M), OCT inspection with swept source were all performed. The BCVA examination was carried out using the international standard visual acuity chart, which was converted into logMAR visual acuity for record. The average IRII was 1.255±0.048, the average logMAR BCVA was 0.63±0.21, the average M value was 0.68±0.38, the average of central macular thickness (CMT) was 353.57±73.92 μm, the average inner retinal layer thickness (IRT) was 181.50±40.91 μm. The complete and incomplete ellipsoid zone (EZ) were 17 and 29 eyes, respectively. All eyes underwent a 25G three-incision closed vitrectomy through the flat part of the ciliary body, and the epiretinal membrane and inner limiting membrane were removed at the same time. The changes of IRII, M value, BCVA, CMT, IRT and EZ were observed at 1, 3, 6, and 12 months after surgery, and the correlation were analyzed between IRII and M value and BCVA before and after surgery. Single-factor repeated measurement data analysis of variance was used for the comparison of BCVA, M value, CMT, and IRT before and after surgery. Spearman rank correlation analysis were adopted for the correlation analysis between IRII and BCVA, M value, CMT, IRT and EZ integrity before and after surgery.Results:Twelve months after surgery, the average IRII and logMAR BCVA were 1.175±0.032 and 0.47±0.16, respectively. Compared with those before surgery, they were significantly improved, and the difference was statistically significant ( F=22.273, 5.453; P<0.001, <0.001). The average M value ( F=20.109), CMT ( F=14.273), IRN ( F=13.665) were significantly lower than those before the operation, and the difference was statistically significant ( P<0.001, 0.001, <0.001). The integrity of EZ was significantly improved compared with that before surgery, and the difference was statistically significant ( χ 2=12.715, P<0.001). The results of correlation analysis showed that preoperative IRII was positively correlated with preoperative M value and CMT ( r=0.951, 0.701; P<0.001, <0.001). It was positively correlated with postoperative M value, logMAR BCVA, CMT and EZ integrity ( r=0.650, 0.369, 0.720, 0.293; P<0.001,<0.001, P=0.048). It was not correlated with preoperative logMAR BCVA and EZ integrity ( r=0.283, 0.001; P=0.056, 0.996). Conclusion:The IRII of IMEM eyes before surgery is significantly correlated with the BCVA and M values after surgery.

Subretinal injection of balanced salt solution for the resolution of refractory diabetic macular edema / 中华眼底病杂志

Objective:To evaluate the therapeutic efficacy of vitrectomy with internal limiting membrane (ILM) peeling and subretinal injection of balance salt solution (BSS) for refractory diabetic macular edema (DME).Methods:A retrospective case series study. From November 2017 to August 2018, 24 eyes of 19 patients affected with DME resistant to anti-VEGF therapy [central macualar thickness (CMT) more than 275 μm despite undergoing anti-VEGF therapy at least 3 times] in Ophtalmology Department of Central Theater Command General Hospital of Chinese People's Liberation Army were enrolled in this study. All the patients underwent 25G pars plana vitrectomy with ILM peeling and subretinal injection of BSS. The BCVA was measured using the international standard visual acuity chart, and the results were converted to the logMAR visual acuity. The CMT and the macular volume (MV) were assessed with swept-source optical coherence tomography at baseline and each month postoperatively. The differences in BCVA, CMT and MV before and after surgery were analyzed.Results:The mean BCVA was 0.74±0.29 at baseline, which increased significantly to 0.62±0.28, 0.56±0.25, 0.47±0.26, 0.46±0.23 at 2 weeks, 1 month, 3 months and 6 months after treatment respectively ( F=4.828, P=0.001). At 6 months, BCVA improved by more than 0.3 logMAR units in 16 eyes (66.7%). The mean CMT was 554.58±102.86 μm at baseline, which reduced to 338.17±58.09 μm,299.42±52.66 μm, 275.75±41.24 μm and 270.96±38.33 μm at 2 weeks, 1 month, 3 months and 6 months after treatment respectively ( F=84.867, P<0.001). The mean MV was 13.01±0.88 mm 3 at baseline, which decreased to 11.50±0.73 mm 3, 11.00±0.74 mm 3, 10.68±0.61 mm 3 and 10.52±0.56 mm 3 at 2 weeks, 1 month, 3 months and 6 months after treatment respectively ( F=47.364, P<0.001). Macular edema recurred in 5 eyes(20.8%) 6 months after surgery. No severe systemic or ocular side effect was reported during the follow-up. Conclusions:25G vitrectomy with ILM peeling and subretinal injection of BSS for refractory DME can improve the visual acuity, facilitate a rapid resolution of macular edema.

Changes of foveal avascular zone size and correlation between foveal avascular zone size and metamorphopsia before and after idiopathic macular epiretinal membrane surgery / 中华眼底病杂志

Objective:To observe the changes of foveal avascular zone (FAZ) size before and after surgery in idiopathic macular epiretinal membrane (IMEM) eyes and analyze the correlation of FAZ with metamorphopsia.Methods:A retrospective case series study. From August 2016 to October 2017, 42 eyes of 38 patients affected with IMEM diagnosed in Central Theater Command General Hospital of Chinese People's Liberation Army were enrolled in this study. All the patients underwent a 25G pars plana vitrectomy (PPV) with IMEM removal and ininternal limiting membrane (ILM) peeling. The BCVA was measured using the international standard visual acuity chart, and the results were converted to the logMAR visual acuity. The severity of metamorphopsia was measured using M-charts. The FAZ areas were evaluated with OCT angiography in both the superficial and deep capillary plexus layers. The central macular thickness (CMT) were assessed with spectral-domain OCT before and after surgery. The logMAR BCVA was 0.61±0.21. The M-score was 0.66±0.38. The CMT of fovea was 337.71±57.63 μm. The FAZ areas in superficial and deep capillary plexus were 0.113±0.037 mm 2 and 0.202±0.03 mm 2, respectively. The differences in BCVA, M-score and FAZ area before and 1, 3, 6, 12 months after surgery were analyzed by ANOVA. The Spearman rank correlation analysis was performed to investigate the relationship between FAZ areas, visual acuity and metamorphopsia. Results:At 12 month after surgery, the FAZ areas in superficial and deep capillary plexus were 0.146±0.021 mm 2 and 0.240±0.019 mm 2, respectively. Compared with baseline, the the FAZ areas in superficial and deep capillary plexus after surgery significantly increased ( F=8.484, 14.346; P<0.001,<0.001). The postoperative logMAR BCVA 0.47±0.19, M-score 0.12±0.22 and CMT 270.60±33.27 μm were significantly improved compared with baseline ( F=5.044, 17.763, 13.545; P=0.001, <0.001, <0.001). The preoperative FAZ area in superficial capillary plexus correlated negatively with preoperative M-score ( r=-0.816, P<0.001); the preoperative FAZ area in deep capillary plexus correlated negatively with preoperative BCVA and M-score ( r=-0.422, -0.882; P=0.005,<0.001). The postoperative FAZ area in superficial capillary plexus correlated negatively with preoperative and postoperative M-score ( r=-0.791,-0.716; P<0.001,<0.001). The postoperative FAZ area in deep capillary plexus correlated negatively with BCVA and preoperative and postoperative M-score ( r=-0.343, -0.330, -0.732, -0.694; P=0.026, 0.033,<0.001,<0.001). Conclusions:PPV with ILM peeling can effectively restore the FAZ areas in superficial and deep capillary plexus, improve the visual acuity and metamorphopsia in patients with IMEM. Both superficial and deep plexus FAZ areas correlated negatively with metamorphopsia, and deep plexus FAZ area also correlated negatively with BCVA.

Development of an immunochromatographic strip for detection of Zika virus NS1 antigen / 热带医学杂志

@#Abstract：Objective To develop a colloidal gold immunochromatographic strip ⁃ based method for the rapid detection of Zika virus（ZIKV）NS1 antigen. Methods The gold nanoparticles modified with the anti⁃ZIKV NS1 monoclonal antibody as the detection probe were coated on the glass ⁃fiber pad. The anti ⁃ZIKV NS1 monoclonal antibody and the goat anti ⁃mouse polyclonal antibody were immobilized on a nitrocellulose membrane as the test line and the control line，respectively. In order to achieve critical results，the ratio of the optical density （OD）of the test line to that of the control line was compared. Serial diluted ZIKV NS1 standard antigen was applied to evaluate sensitivity of the immunoassay. The culture supernatant and serum samples for arboviruses（ZIKV，Dengue virus, Japanese encephalitis virus and Chikungunya virus） were utilized to demonstrate the specificity of the method. Results The detection result could read by naked eyes within 20 minutes. The visual cut ⁃off level for the test strip was achieved at 100 ng/mL of the Zika virus NS1 standard antigen. No cross⁃reactions with Dengue virus，Japanese encephalitis virus and Chikungunya virus were observed. The strip could remain good stability within 36 weeks whether stored in 4 ℃ or room temperature（22-25 ℃）. Conclusion Apart from stability， the method was convenient，rapid and specific for ZIKV NS1 antigen，which showed a promising potential in the point of care test and the screening test.

Progress in epigenetic modification of mRNA and the function of m6A modification / 生物工程学报

Messenger RNA (mRNA) can be modified by more than 100 chemical modifications. Among these modifications, N6-methyladenosine (m⁶A) is one of the most prevalent modifications. During the processes of cells differentiation, embryo development or stress, m⁶A can be modified on key mRNAs and regulate the progress of cells through modulating mRNA metabolism and translation. Other mRNA modifications, including N1-methyladenosine (m¹A), 5-methylcytosine (m⁵C) and pseudouridine, together with m⁶A form the epitranscriptome of mRNA that accurately modulate the mRNA translation. Here we review the types and characteristic of mRNA epigenetic modifications, especially the recent progresses of the function of m⁶A, we also expect the main research direction of m⁶A epigenetic modification in the future.

Intravitreal injection of C3F8 in the treatment of vitreomacular traction syndrome / 中华眼底病杂志

Objective To evaluate the efficacy of single intravitreal injection of C3F8 in treating vitremacular traction (VMT) syndrome.Methods A retrospective case series of 38 eyes of 36 patients affected with VMT syndrome in Department of Ophthalmology,Central Theater Command General Hospital from March 2016 to June 2017 were enrolled in this study.There were 16 males (16 eyes) and 20 females (22 eyes),with the mean age of 64.1 1 ± 9.49 years and the mean courses of 151.55 ± 127.87 days.All the patients received an intravitreal injection of 0.3 ml of 100％ C3F8 within one week.The BCVA examination was performed using the international standard visual acuity chart,which was converted into logMAR visual acuity.The severity of metamorphopsia was detected using M-charts.The extent of vitreomacular adhesion (VMA),central macular thickness (CMT) and the status of ellipsoid zone (EZ) were assessed with spectral-domain OCT at baseline and each month after treatment.The average BCVA was 0.58± 0.22.The mean horizontal metamorphopsia (MH)and vertical metamorphopsia (MV) were 0.34±0.30 and 0.50±0.42,respectively.The mean CMT was 415.15 ± 89.59 μm.The mean horizontal VMA was 1168.68± 400.61 μm (30 eyes with VMA ≤ 1500 μtm and 8 eyes with VMA＞ 1500 μm).The mean vertical VMA was 976.89±295.92 μtm.There were 22 eyes with integrity EZ and 16 eyes without integrity EZ,33 eyes with crystalline lens and 5 eyes with IOL.The mean follow-up time was 10.7 months.The differences in BCVA,MH,MV,CMT,the integrity of EZ before and after treatment were analyzed.The VMT release rates were assessed.The Spearman rank correlation analysis was performed to investigate the relationship of VMT release rates with the data at baseline.Results Vitreomacular traction release occurred in 29 of 38 eyes by the final follow-up visit,the VMT release rate was 76.3％.VMT release occurred and the average time of VMT release occurred was 2.2 weeks.VMT persisted in 7 eyes,in the rest two eyes,one eye developed a retinal detachment and another eye formed macular hole,both eyes responded to vitrectomy.At 6 months after treatment,the average logMAR BCVA was 0.43±0.23,the mean MH and MV were 0.25± 0.23 and 0.24± 0.23,the mean CMT was 310.61 ± 63.10 pm.Among 16 eyes without integrity EZ before treatment,there were 9 eyes with integrity EZ at 6 months after treatment.There were 16 eyes with integrity EZ and 9 Compared with baseline,the mean BCVA at 6 months after treatment was significantly increased (F=3.779,P=0.037),but the MV (F=4.958,P =0.003) and CMT (F=13.419,P＜0.001) were significantly decreased,the integrity of EZ was improved significantly (22=5.050,P=0.025).The VMT release correlated inversely with the extent of horizontal VMA,BCVA,and CMT at baseline (r=-0.514,-0.348,-0.429;P=0.009,0.001,0.038).Conclusion Intravitreal injection of C3F8 can induce a posterior vitreous detachment and release vitreomacular traction,it is an efficient and safe treatment for VMT syndrome.It can improve the visual acuity,metamorphopsia and foveal morphology in patients with VMT syndrome.

Correlation between foveal avascular zone size and foveal morphology in patients with idiopathic macular epiretinal membrane / 中华眼底病杂志

Objective To analyze the correlation between foveal avascular zone (FAZ) size and foveal morphology in patients with idiopathic macular epiretinal membrane (IMEM) using OCT angiography (OCTA).Methods A retrospective case series study contained of 54 eyes of 54 patients affected with IMEM (IEM group) and 50 eyes of 50 normal persons as the control group.The BCVA was measured using the international standard visual acuity chart,and the results were converted to the logMAR visual acuity.The FAZ areas were evaluated with OCTA in both the superficial and deep capillary plexus layers by using 3 mm × 3 mm images of the macular.The central macular thickness (CMT),inner retinal layer thickness (IRT),outer retinal layer thickness (ORT),subfoveal choroidal thickness (SFCT),and the status of ellipsoid zone (EZ) were assessed with spectral-domain optical coherence tomography.The differences of FAZ areas between the two groups were analyzed.The correlative analysis was performed to investigate the relationship between areas and foveal morphology.Results Compared with control group,the FAZ area in superficial and deep capillary plexus in the IMEM group were significantly smaller (t=-29.095,-28.743;P＜0.001,＜0.001);the mean CMT,IRT,ORT and SFCT were significantly thickening in the IMEM group (Z=-8.784,-8.524,-7.709,-7.535;P＜0.001,＜0.001,＜0.001,＜0.001).In the IMEM group,the FAZ area in superficial capillary plexus correlated inversely with the CMT,IRT,and the integrity of EZ (r=-0.464,-0.536,-0.293;P＜ 0.001,＜ 0.001,0.039),no significant correlation of superficial plexus FAZ areas with ORT and SFCT (r=-0.218,-0.165;P=0.172,0.157).The FAZ area in deep capillary plexus correlated inversely with the CMT,IRT,and the integrity of EZ (r=-0.306,-0.694,-0.468;P=0.037,＜0.001,＜0.001),no significant correlation with ORT and SFCT (r=-0.242,-0.227;P=-0.079,0.094).Conclusions The FAZ areas is significantly decreased in IMEM eyes compared with normal eyes.Both superficial and deep FAZ area are correlated with the CMT,IRT,and the integrity of EZ.

The hole closure rate of swept-source optical coherence tomography-guided facedown positioning for macular hole surgery / 中华眼底病杂志

Objective To observe the hole closure rate of swept-source optical coherence tomography (SS-OCT)-guided facedown positioning for idiopathic macular hole (IMH) surgery.Methods A retrospective case series of 64 eyes of 64 patients affected with IMH.All the patients underwent a 25G pars plana vitrectomy (PPV) with internal limiting membrane (ILM) peeling and intraocular perfluoropropane (C3F8) tamponade.In 35 eyes of 35 patients,the facedown positioning was halted after detecting an hole closure through intraocular gas in the SS-OCT images at the early period after surgery (the SS-OCT group).In 29 eyes of 29 patients,the facedown positioning was halted atter detecting an hole closure in the SS-OCT images when the macular zone was uncovered by intraocular gas (the control group).The follow-up was ranged from 6 to 11 months,with the mean follow-up time was 8.4 months.The hole closure rate at 6 months after surgery were compared between two groups by two independent sample Wilcoxon rank sum test.The duration of the facedown positioning and complications were compared between two groups.Results The period of facedown position was (1.67± 1.28) and (7.65 ± 1.42) days in the SS-OCT group and control group,respectively.The difference of the period of facedown position between the two groups was significant (Z=-6.784,P＜ 0.05).At 6 months after surgery,the hole closure was detected in 30 eyes (85.71％) in the SS-OCT group and in 27 eyes (93.10％) in the control group.There was no difference of hole closure rate between the two groups (x2=0.889,P＞0.05).There was no ocular serious side effect during the follow up,such as leakage of sclera incision,retinal hemorrhage,choroidal hemorrhage and endophthalmitis.In the control group,there were two patients with mild dizziness who underwent symptomatic treatment.There was no systemic side effect during the follow-up in the SS-OCT group.Conclusion Confirming with SS-OCT imaging early closure of macular hole ofIMH patients with gas tamponade can serve as an important guide to significantly shorten the period of facedown positioning,while achieved a high hole closure rate.

Correlation of foveal avascular zone size with visual acuity and metamorphopsia in idiopathic macular epiretinal membrane eyes using optical coherence tomography angiography / 中华眼底病杂志

Objective To analyze the correlation of foveal avascular zone (FAZ) size with visual acuity and metamorphopsia in idiopathic macular epiretinal membrane (IMEM) eyes.Methods This is a cross-sectional study, including 43 patients (43 eyes) with IMEM (IMEM group) and 35 health subjects (35 eyes) as control group. The best corrected visual acuity (BCVA) was measured using the international standard visual acuity chart, and the results were converted to the logarithm of the minimum angle of resolution (logMAR) visual acuity. The severity of metamorphopsia was measured using M-charts. The FAZ areas were estimated with optical coherence tomography angiography (OCTA) in both the superficial and deep capillary plexus layers. The central macular thickness (CMT) was assessed with spectral-domain optical coherence tomography. There was no difference of logMAR BCVA and CMT between two groups (Z=?7.379, ?7.560;P<0.001). The differences of FAZ areas between the two groups were analyzed. The correlative analysis was performed to investigate the relationship between FAZ areas and visual acuity as well as metamorphopsia.Results The FAZ area in superficial and deep capillary plexus in IMEM group were smaller than those in control group (t=?30.316, ?27.606;P<0.001). In IMEM group, the mean M-score was 0.41±0.32; the horizontal and vertical M-score were 0.49±0.40 and 0.32±0.29, respectively. The horizontal M-score was higher than vertical M-score with the significant difference (Z=?2.000,P=0.046). In IMEM group, the FAZ area in superficial capillary plexus correlated inversely with metamorphopsia (r=?0.709,P<0.001); the FAZ area in deep capillary plexus correlated inversely with metamorphopsia and BCVA (r=?0.533, ?0.838;P<0.001).Conclusions The FAZ areas are significantly decreased in IMEM eyes compared with normal eyes. Both superficial and deep FAZ areas are correlated with metamorphopsia, and deep FAZ area is also correlated with BCVA.

Altered expression of AMPAR and NMDAR subunits in hippocampal CA1 area with contextual fear memory generalization in mice / 中华行为医学与脑科学杂志

Objective To investigate the alteration of subunit expression of AMPAR and NMDAR in hippocampal CA1 area of mice with contextual fear memory generalization.Methods 35 male C57BL/6 mice,aged 8 weeks,were involved in the experiment.Seven mice were randomly selected as the naive group, which didn't receive the behavioral training.28 mice experienced the context fear conditioning and contextual shift task were divided into generalization group and non generalization group according to the result.Then Western blot was used to measure the expression of AMPAR and NMDAR subunits in CA1 in the naive group,non generalization group and generalization group.Results (1)Seven mice(discrimination ratio:0.52±0.08)showed contextual generalization when undergoing the same stress level,while the other 21 mice (discrimination ratio:0.75±0.07)didn't(P<0.01),however,these two group showed similar freezing(%) in the memory acquisition process.(2)The subunit composition of AMPA receptors had no significant differ-ence in CA1 area among the Naive group,non generalization group and generalization group(P>0.05).(3) NR1 subunit was similar in the three groups(P>0.05).NR2A expression was significantly increased in the non generalization group(1.11±0.20)and generalization group(1.09±0.20)compared with that in the na-ive group(0.95±0.17)(both P<0.05).The expression of NR2B was significantly increased in generalization group(1.05±0.17)compared with that in the naive group(0.83±0.19)and non generalization group(0.80± 0.14)(both P<0.05).The ratio of NR2A/NR2B was significantly increased in non generalization group (1.23±0.25)compared with that in the naive group(0.89±0.31)and generalization group(0.86±0.17) (both P<0.05).Conclusion (1)Only part of the individuals show contextual fear memory generalization after the same stress,and this contextual generalization progress is not related to the acquisition of context fear memory.(2)There is no significant change in expression of AMPAR subunits in CA1 of mice with the contextual generalization.The rise of NR2B and the decline of ratio of NR2A/NR2B are the main changes, suggesting that consequently the alternation of synaptic plasticity maybe one of the mechanisms of contextual fear memory generalization.

Expression of the MYL2 gene in the development of rat testis tissue / 中华男科学杂志

<p><b>Objective</b>To study the expression of the gene of myosin regulatory light chain-2 (MYL2) in the development of rat testis tissue.</p><p><b>METHODS</b>Using real-time PCR and immunohistochemistry, we determined the mRNA transcription level and protein expression of MYL2 in the rat testis.</p><p><b>RESULTS</b>The mRNA expression of the MYL2 gene changed in an age-dependent manner, reaching the highest value on postnatal day (PND) 2, then dropped rapidly till PND 8, increased slowly on PNDs 10 and 12, decreased on PND 14, rose slightly from PND 15 and rapidly on PNDs 20 and 25, and declined slowly from PND 65. Immunohistochemistry showed that the MYL2 protein was mainly expressed in testicular sperm cells.</p><p><b>CONCLUSIONS</b>The MYL2 gene may be involved in the proliferation of spermatogonial stem cells and the process of sperm cells developing into mature sperm.</p>

Exercise training attenuates hypertension progression via activation of central ACE2-Ang(1-7)-Mas axis in prehypertensive rats / 中国病理生理杂志

AIM:To investigate the effects of exercise training on the progression from prehypertension to hy -pertension,blood pressure regulation and the angiotensin-converting enzyme 2(ACE2)-angiotensin(Ang)(1-7)-MAS axis activation in cardiovascular centers ,and to elucidate the central mechanisms of exercise training postponing hyperten -sion progression.METHODS:The male spontaneously hypertensive rats(SHR;n=20,5 weeks old)and normotensive Wistar Kyoto(WKY)rats(n=20)were randomly assigned to sedentary(Sed)group and exercise training(ExT)group. The trained rats run on a treadmill in moderate-intensity for 20 weeks.Systolic blood pressure(SBP)was measured by tail-cuff method.The baroreflex sensitivity(BRS)was assessed by intravenous injection of phenylephrine.The expression of ACE2 and MAS receptor at mRNA and protein levels in baroreflex centers were determined by real-time PCR and Western blot,respectively.Alterations of BRS were evaluated before and after intracerebroventricular injection of MAS receptor ago -nist Ang(1-7)and its antagonist A779,respectively.RESULTS:Compared with SHR +Sed group,exercise training since prehypertension significantly postponed the development of hypertension ,delayed the hypertension progression ,and decreased SBP in both SHR and WKY rats(P<0.05).Exercise training enhanced blood pressure regulation and improved the BRS in SHR(P<0.01).The expression of ACE2 and MAS receptor at mRNA and protein levels in the baroreflex cen-ters(rostral ventrolateral medulla ,nucleus tract solitarius and paraventricular nucleus )were up-regulated in SHR +ExT group(P<0.05).Central administration of A779 abolished the benefits of exercise-induced improvement of BRS in SHR +ExT group(P<0.01).In contrast,Ang(1-7)improved the BRS in both SHR +Sed group and SHR +ExT group(P<0.05).CONCLUSION:Exercise training postpones hypertension progression and improves blood pressure regula -tion,which may be associated with the activation of central ACE 2-Ang(1-7)-Mas axis.

Prediction of three-dimensional dose distribution in intensity-modulated radiation therapy based on neural network learning / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish the association between the geometric anatomical characteristics of the patients and the corresponding three-dimensional (3D) dose distribution of radiotherapy plan via feed-forward back-propagation neural network for clinical prediction of the plan dosimetric features.</p><p><b>METHODS</b>A total of 25 fixed 13-field clinical prostate cancer intensity-modulated radiation therapy (IMRT)/stereotactic body radiation therapy (SBRT) plans were collected with a prescribed dose of 50 Gy. With the distance from each voxel to the planned target volume (PTV) boundary, the distance from each voxel to each organ-at-risk (OAR), and the volume of PTV as the geometric anatomical characteristics of the patients, the voxel deposition dose was used as the plan dosimetric feature. A neural network was used to construct the correlation model between the selected input features and output dose distribution, and the model was trained with 20 randomly selected cases and verified in 5 cases.</p><p><b>RESULTS</b>The constructed model showed a small model training error, small dose differences among the verification samples, and produced accurate prediction results. In the model training, the point-to-point mean dose difference (hereinafter dose difference) of the 3D dose distribution was no greater than 0.0919∓3.6726 Gy, and the average of the relative volume values corresponding to the fixed dose sequence in the DVH (hereinafter DVH difference) did not exceed 1.7%. The dose differences among the 5 samples for validation was 0.1634∓10.5246 Gy with percent dose differences within 2.5% and DVH differences within 3%. The 3D dose distribution showed that the dose difference was small with reasonable predicted dose distribution. This model showed better performances for dose distribution prediction for bladder and rectum than for the femoral heads.</p><p><b>CONCLUSION</b>We established the relationships between the geometric anatomical characteristics of the patients and the corresponding planning 3D dose distribution via feed-forward back-propagation neural network in patients receiving IMRT/SBRT for the same tumor site. The proposed model provides individualized quality standards for automatic plan quality control.</p>

Constraint priority list-based multi-objective optimization for intensity-modulated radiation therapy / 南方医科大学学报

In intensity-modulated radiation therapy (IMRT), it is time-consuming to repeatedly adjust the objectives manually to obtain the best tradeoff between the prescribed dose of the planning target volume and sparing the organs-at-risk. Here we propose a new method to realize automatic multi-objective IMRT optimization, which quantifies the clinical preferences into the constraint priority list and adjusts the dose constraints based on the list to obtain the optimal solutions under the dose constraints. This method contains automatic adjustment mechanism of the dose constraint and automatic voxel weighting factor-based FMO model. Every time the dose constraint is adjusted, the voxel weighting factor-based FMO model is launched to find a global optimal solution that satisfied the current constraints. We tested the feasibility and effectiveness of this method in 6 cases of cervical cancer with IMRT by comparing the original plan and the automatic optimization plan generated by this method. The results showed that with the same PTV coverage and uniformity, the automatic optimization plan had a better a dose sparing of the organs-at-risk and a better plan quality than the original plan, and resulted in obvious reductions of the average V45 of the rectum from (41.99∓13.31)% to (32.55∓22.27)% and of the bladder from (44.37∓4.08)% to (28.99∓15.25)%.

Polymorphisms of 19 STR Loci in Guizhou Han Population and Their Forensic Application / 法医学杂志

Objective To investigate the allelic distribution of 19 autosomal STR loci in Guizhou Han population,and to estimate the forensic application value.Methods The 19 autosomal STR loci in 520 unrelated healthy individuals from Guizhou Han population were studied using GoldeneyeTM 20A kit.The 310 genetic analyzer was used for capillary electrophoresis,and the GeneMapper(R) ID v3.1 for genotyping.Results The heterozygosis,the discrimination power,the probability of exclusion,the polymorphism information content,the cumulative discrimination power and the cumulative probability of exclusion of the 19 STR loci were 0.603 8-0.9164,0.7900-0.985 6,0.295 5-0.8269,0.553 5-0.9089,1-1.2300×10-22 and 0.999 999 99,respectively.Compared with other five Han populations in pairwise allelic frequencies,Guizhou Han only had significant differences with Shandong Han,Liaoning Han and Shanxi Han.Conclusion The 19 autosomal STR loci such as D19S433 have a highly genetic polymorphic in Guizhou Han population,which have application values in the researches of population genetics and forensic genetics.