Purification and activity of anti-PD-L1&CXCR4 bispecific nanobody / 中国药科大学学报

@#Targeted programmed death-ligand 1 (PD-L1) and CXC chemokine receptor type 4 (CXCR4), gene sequences encoding anti-PD-L1 nanobody and anti-CXCR4 nanobody were cloned into the pET-22b (+) vector to construct recombinant expression plasmid of anti-PD-L1&CXCR4 bispecific nanobody, which was connected with 6 × His tag and transformed into E.coli BL21 (DE3). The expressed proteins were then found to exist as a soluble form in the supernatant of bacterial lysate after induction of IPTG.Three purification methods were used to obtain the target protein in order to improve the yield and purity of the bispecific nanobody.The bacterial supernatant was separated and purified by His Trap FF affinity chromatographic column.The target protein output could exceed 1 mg/L, and the product purity could reach up to 97%.Besides, the anti-PD-L1&CXCR4 bispecific nanobody shows a specific binding ability to two antigens on the cell surface, enhancing the cytotoxicity of IL-2 activated human peripheral blood mononuclear cells (PBMC) to tumor cell line AsPC-1, which lays the foundation for further evaluation of its drug efficacy in vivo.

Analysis of misdiagnosis of 65 cases of left renal vein entrapment syndrome / 中国基层医药

Objective Through the analysis of misdiagnosis left renal vein entrapment syndrome,to improve the understanding and reduce the misdiagnosis of this disease.Methods 82 cases of left renal vein compression syn-drome were diagnosed with ultrasound,65 cases were misdiagnosed.Clinical data of these 65 patients were analyzed.Results In 82 cases,only 11 doctors from renal department of internal medicine,pediatrics,department of urology wrote application for it.Among the 65 misdiagnosed cases,30 cases of male,female 35 cases.The age ranged from 6 to 37 years old,the average age was 16.1 years.The misdiagnosis duration ranged from 2 months to 42 months,the median time was 7 months.43 cases of low back pain or backache,urinary tract irritation in 5 cases,60 cases of abnor-mal urinalysis:a simple urinary protein in 15 cases,21 cases of simple hematuria,proteinuria,hematuria 24 cases. 31 cases were misdiagnosed as chronic glomerulonephritis,occult nephritis(asymptomatic proteinuria and hematuria syndrome)in 11 cases,acute nephritis comprehensive sign in 9 cases,7 cases of lumbar muscle strain,urinary tract infection in 4 cases,1 case of urinary tract stones,pelvic inflammatory disease in 2 cases.In the 16 cases complicated with glomerular nephritis,were treated as the glomerular nephritis before (11 cases of chronic nephritis,5 cases of asymptomatic proteinuria and hematuria syndrome).12 cases of abnormal urine fluctuation,after a delay of 3 -16 months referral doctor was diagnosed with left renal vein entrapment syndrome.Conclusion The disease has no char-acteristic clinical manifestations,and most clinicians were short in understanding of the disease,so the misdiagnosis rate is high.The clinicians should improve the understanding of the disease,in order to reduce the misdiagnosis rate.

Effect of lymphovascular invasion on prognosis in high-grade pT1 bladder cancer after first transurethral resection of bladder tumor / 中国医师进修杂志

Objective To explore the effect of lymphovascular invasion (LVI) on prognosis in the high-grade stage pT1 bladder cancer after first transurethral resection of bladder tumor (TURBT). Methods Thirty-five high-grade stage pT1 bladder cancer patients who underwent first TURBT and showed LVI positive according to the postoperative pathological (observation group) and 70 high-grade stage pT1 bladder cancer patients who underwent first TURBT and showed LVI negative according to the postoperative pathological (control group) were enrolled into the study. The tumor recurrence rate, tumor progression rate, recurrence-free survival (RFS) and overall survival (OS) were compared between 2 groups. Results The follow-up time in observation group was 15 - 71 (42.1 ± 18.1) months, and in control group was 20-72 (50.9 ± 12.2) months. The tumor recurrence rate and tumor progression rate in observation group were significantly higher than those in control group:88.6%(31/35) vs. 34.3%(24/70) and 54.3%(19/35) vs. 22.9%(16/70), and there were statistical differences (P<0.01). The RFS and OS in observation group were significantly shorter than those in control group: (19.7 ± 4.5) months vs. (46.8 ± 9.2) months and (43.4 ± 12.6) months vs. (63.4 ± 7.1) months, and there were statistical differences (P<0.05). Conclusions There is a significant correlation between LVI and tumor recurrence and progression in the high-grade pT1 bladder cancer after first TURBT, and the LVI can predict disease progression and poor prognosis.

Experience of laparoscopic treatment of ureteral calculi / 中国综合临床

Objective To summary the therapy outcome of retroperitoneal laparoscopic treatment on upper ureteral calculi.Methods The retroperitoneal laparoscopic treatment were performed to all cases from Jun.2011 to Jun.2012 in our hospital.All cases were treated with 3-hold method (two 10 mm and one 5 mm ports).The retroperitoneal space was made by a combination of blunt and balloon dissection,and the space was maintained with CO2 Ureteral longitudinal incision was made to remove the stones,and double J catheter was served as stent drainage.Absorbable suture was used to suture ureteral incision.Results A retroperitoneal approach was performed in 12 patients,and another patient was conducted the open surgery because the stone cower in the kidney calices.Operative periods ranged from 55 to 132 min (average was 85 min).There were no significant postoperative complications.Conclusion It is a minimally invasive and effective approach in the therapy of upper urerteral calculi with laparoscopic.