Distribution and clinical significance of ACE2, a key receptor of 2019-nCoV, in ocular tissues / 中华实验眼科杂志

Coronavirus disease-19 (COVID-19) has reached pandemic status, and its pathogeny is the 2019 novel coronavirus (2019-nCoV).2019-nCoV mainly causes human respiratory infection and pulmonary inflammation; however, some COVID-19 patients are found to present viral conjunctivitis.Bilateral viral conjunctivitis is an initial symptom in some other cases.It is therefore, vital to understand whether the eye can be directly infected by the virus, as well as the consequences of the viral infection in the ocular tissue.2019-nCoV invades human cells primarily by binding to the angiotensin-converting enzyme 2 (ACE2) receptors.ACE2 expresses, not only in the lungs, kidneys, and cardiovascular system, but also in human conjunctiva, cornea, aqueous humor, and retina.Therefore, it is crucial to comprehensively expand the present understanding of the COVID-19 infection mechanism and pathogenesis by clarifying the distribution of ACE2 in the eye.ACE2 is not only the receptor of 2019-nCoV, but also a key enzyme in the renin-angiotensin system (RAS). RAS, which appears relatively independent in the eye, plays a modulating role and is associated with many common eye diseases.This article reviews the distribution and clinical significance of ACE2 in ocular tissues.

Modified technique of ureteral stent placement during transurethral resection of bladder cancer invading the ureteral orifice / 国际外科学杂志

Objective To evaluate the efficacy and safety of modified technique of ureteral stent placement during transurethral resection of bladder tumor.Methods Seventeen patients with muscle invasive bladder cancer invading the ureteral orifice from March 2014 to June 2016 in Beijing Friendship Hospital were randomly divided into two groups.In the modified technique group (group A,n =10),tumor was resected until the ureteral orifice was exposed.Then,a guide wire was placed through the tunnel of Electrode loop and the ureteral stent was placed along the guide wire.In control group (group B,7 cases),after ureteral orifice exposed,the guide wire and ureteral stent was placed with cystoscopy.The demographic,oncological baseline and operative factors were evaluated between two groups.Results There was no difference in tumor grade and maximum diameter between two groups (P ＞ 0.05).The operation time in group A was significantly shorter than that in group B [(39.5 ± 14.8)min vs (59.3 ± 16.2) min,P =0.020],and the intraoperative vision clarity score was better in group A as well [(7.7 ± 1.3) vs (5.9± 1.2),P =0.010].There was no statistical difference between the two groups in the complication.Conclusions The modified technique can improve the efficiency of ureteral stent placement during transurethral resection of bladder tumor without any risk enhancement.

Trasmission of rabies virus from an organ donor to two renal transplant recipients / 中华器官移植杂志

Objective To investigate the clinical characteristics and strategy of prophylaxis and treatment of rabies.Methods Two recipients and their donors with rabies were reviewed to confirm the transmission through kidney transplantation.Saliva,urine,and sputum samples from recipients were collected for the detection of rabies virus by reverse transcription PCR (RT-PCR).Results The donor was a 6-year old boy,died of viral encephalitis of unknown cause.His kidneys and corneas were donated for transplantation.Two recipients who received the donor kidneys had neurological symptoms associated with rabies successively.Both of the two recipients died 44 days and 34 days after onset of post-transplant symptoms.Saliva,urine,and sputum samples were positive for rabies virus nucleic acid.The epidemiological investigation revealed that the boy had a history of close contact with his dog.The parents denied the history of animal bites or rabies prophylaxis.Conclusion The rabies virus can be transmitted through organ transplantation.Incubation period of rabies transmitted from donor is shorter than general population and the mortality rate is up to 100％ after onset of symptoms.So,both coordinators and doctors should deeply understand the rabies.The evaluation and supervision of donor derived diseases should be strengthened.The donors should not be donated whenever the rabies is not completely excluded,especially those died of encephalitis of unknown cause.Furthermore,post-exposure prophylaxis of rabies should be administered as soon as possible before onset of symptoms after transplant from a donor with rabies.