From October 2021 to February 2023, we retrospectively analyzed the clinical and laboratory data of six patients (three male and three female, median age: 54 years, age range: 29-73 years) with mast cell leukemia (MCL) diagnosed in the First Affiliated Hospital of Soochow University (The Mastocytosis Collaborative Network of China). All patients had acute MCL, with at least one C-finding present. The main clinical presentations were hypoalbuminemia ( n=4), fatigue ( n=3), fever ( n=2), abdominal discomfort ( n=2), osteolytic lesions ( n=2), dizziness ( n=1), skin flushing ( n=1), and weight loss ( n=1). Splenomegaly and lymphadenopathy were noted in six and three patients, respectively. Six patients were strongly positive for CD117, five were positive for CD30 and CD25, and four were positive for CD2. Four patients had a normal karyotype and two patients had an abnormal karyotype. Gene mutations were detected in 4/6 cases. The median serum tryptase level was 24.9 (range: 20.1-171.9) μg/L. Two patients were treated with venetoclax and azacitidine for induction (one patient achieved partial remission by combination with afatinib, while there was no remission after combination with dasatinib in the other patient). Two patients did not achieve complete remission despite treatment with cladribine and imatinib, respectively. One patient treated with interferon combined with glucocorticoids was lost to follow-up, and one patient abandoned treatment. The follow-up time ranged from 1.1 to 21.7 months. Three patients died and two survived. Overall, MCL is a rare subtype of systemic mastocytosis with heterogeneous clinical course, and these patients have poor outcome. A better understanding of the clinical characteristics, treatment, and prognosis of MCL is urgently needed.

Objective To compare the effects of different statistical protocols on the results of external quality assessment(EQA)of se-men,and select appropriate statistical protocols for the promotion of EQA of semen.Methods Taking sperm concentration as an ex-ample,the semen EQA data of 20 laboratories in Hunan Province in 2022 were selected,and the advantages and disadvantages of the traditional statistical scheme(TSS),robust statistical scheme(RSS)and traditional statistical scheme after eliminating the"outliers"(TSEOS)combined with robust statistical technology were analyzed and compared.Results The"outliers"could not be excluded from the sperm concentration data of the four groups in the TSS,which led to the difference between TSS and RSS or TSEOS.The num-ber of qualified laboratories for TSS and RSS were 19 vs 16,19 vs 16,19 vs 19,and 19 vs 19,respectively.Conclusion The results of RSS are similar to those of TSEOS.Compared with TSS,RSS do not need to remove outlier data steps,and are more suitable for se-men EQA data analysis with small data volume.

Hematopoietic stem cell (HSC) transplantation is the only curative therapy for many diseases. HSCs from umbilical cord blood (UCB) source have many advantages over from bone marrow. However, limited HSC dose in a single CB unit restrict its widespread use. Over the past two decades, ex vivo HSC expansion with small molecules has been an effective approach for obtaining adequate HSCs. Till now, several small-molecule compounds have entered the phase I/II trials, showing safe and favorable pharmacological profiles. As HSC expansion has become a hot topic over recent years, many newly identified small molecules along with novel biological mechanisms for HSC expansion would help solve this challenging issue. Here, we will give an overview of HSC biology, discovery and medicinal chemistry development of small molecules, natural products targeting for HSC expansion, and their recent clinical progresses, as well as potential protein targets for HSC expansion.

Objective:To investigate whether coxsackievirus A 16 (CVA16) infection would affect the expression of N6-methyladenosine (m 6A) methylation-related proteins in human bronchial epithelial cells (16HBE), ICR suckling mice and SCRBA2 humanized mice and influence their subcellular localization. Methods:CVA16 was used to infect 16HBE cells at a multiplicity of infection (MOI) of 0.1 and mice at 10 7 CCID 50/ml. Changes in the expression of methyltransferases, demethylases and methylated reading proteins were analyzed by Western blot. Cellular localization of these proteins was observed using immunofluorescence. Results:The expression of m 6A methylation-related proteins was gradually reduced in CVA16-infected cells with time, but showed no obvious change in ICR suckling mice or SCRBA2 humanized mice. After infection, m 6A methylation-related proteins were redistributed in both the nucleus and cytoplasm and even degraded. Conclusions:CVA16 replication in host cells altered the expression and cellular localization of m 6A methylation-related proteins, which indicated that m 6A modification might be a new potential target for enterovirus therapy.

Objective:To explore the influence of blood pressure (BP) profiles 24 h after early endovascular treatment (EVT), including mean blood pressure and blood pressure variability, in clinical prognoses of patients with acute large vessel occlusion stroke (ALVOS) of anterior circulation 90 d after EVT.Methods:Clinical data and blood pressure profiles of patients with ALVOS of anterior circulation who received EVT in our hospital from July 2014 to February 2019 were prospectively collected. The 90-d modified Rankin scale (mRS) scores were used as clinical prognosis evaluation, and modified thrombdysis in cerebral infarction (mTICI) was used as evaluation criteria for recanalization of postoperative occlusive blood vessels. Multivariate Logistic regression analysis was used to determine the independent influencing factors for prognoses 90 d after EVT.Results:(1) Two hundred and sixteen patients were collected; 159 patients were with successful recanalization and 57 patients were with unsuccessful recanalization; 90 d after EVT, 95 patients (44%) had good prognosis and 121 patients (56%) had poor prognosis. As compared with patients in the good prognosis group, patients in the poor prognosis group had signficantly advanced age, signficantly higher proportion of patients with atrial fibrillation, signficantly higher baseline NIHSS scores, and signficantly lower baseline ASPECT scores ( P<0.05); and the differences of occlusion locus were statistically significant between patients from the good and poor prognosis groups ( P<0.05). Patients in the poor prognosis group had significantly higher baseline systolic blood pressure (SBP), mean SBP, max SBP, and significantly higher standard deviation, variable coefficient, and continuous variation of SBP, and statistically higher standard deviation, variable coefficient, and continuous variation of diastolic blood pressure (DBP) as compared with those in the good prognosis group ( P<0.05). Multivariable Logistic regression analysis showed that the standard deviation and continuous variation of SBP were independent influencing factors for clinical prognoses 90 d after EVT ( OR=1.116, 95%CI: 1.002-1.243, P=0.047; OR=1.116, 95%CI: 1.016-1.227, P=0.022). (2) In patients with successful recanalization, as compared with patients in the good prognosis subgroup, patients in the poor prognosis subgroup had signficantly advanced age, statistically higher proportions of patients with diabetes mellitus and atrial fibrillation and baseline NIHSS scores, and statistically lower baseline ASPECT scores ( P<0.05); and the differences of occlusion locus and first choices of treatment were statistically significant between patients in the good and poor prognosis subgroups ( P<0.05). Patients in the poor prognosis subgroup had significantly higher baseline SBP and max SBP, and significantly higher standard deviation, variable coefficient, and continuous variation of SBP, and statistically higher variable coefficient of DBP as compared with those in the good prognosis subgroup ( P<0.05). Multivariable Logistic regression analysis showed the standard deviation, variable coefficient, and continuous variation of SBP were independent influencing factors for clinical prognoses 90 d after EVT ( OR=1.164, 95%CI: 1.021-1.326, P=0.023; OR=1.191, 95%CI: 1.007-1.409, P=0.041; OR=1.141, 95%CI: 1.018-1.279, P=0.024). However, in patients with unsuccessful recanalization, there were no significant differences in blood pressure proliles between the good prognosis subgroup and poor prognosis subgroup ( P>0.05). Conclusion:The blood pressure variability 24 h after EVT is correlated with the clinical prognoses of patients with ALVOS of anterior circulation 90 d after EVT.

This paper highlights the current research and knowledge, and reviews the incidence, pathogenesis, laboratory diagnosis andantibiotic therapy.M.genitalium is one of the major causes of nongonococcal urethritis worldwide.Its pathogenesis is not fully clear,which may be associated with toxin, immune response and persistent infection.Diagnosis is achievable only through nucleic acid amplification testing(NAAT).Azithromycin, moxifloxacin and doxycycline have been the treatments of choice for M. genitalium infections.Rapid spread of macrolide resistance as well as emergence of quinolone resistance has occurred.Increasing rates of treatment failure have resulted in an urgent need for new therapies.(Chin J Lab Med,2018,41:328-332)

Chlamydia psittaci is a causative agent of psittacosis,which can infect a wide range of hosts including birds and humans.However,information regarding C.psittaci infection in pigeons is scarce.In the present study,a total of 399 fecal samples from pigeons were collected from Jilin Province,northeastern China,between March and May 2015,and examined by nested PCR amplification of outer membrane protein A (ompA) gene.The overall Chlamydiosis prevalence was 5.01％ (21/399),with 3.19％ in Changchun City and 9.40％ in Jilin City.Furthermore,breed was the major risk factor associated with Chlamydia infection in pigeon,boiler pigeons had a prevalence of 7.49％,whereas no C.psittaci was detected in racing pigeons.Sequence analysis of the ompA gene revealed that all the identified isolates represented C.psittaci genotype B.Our results firstly indicated the presence of zoonotic C.psittaci in boiler pigeons in Jilin Province,northeastern China,and effective measures should be implemented to reduce the risk of C.psittaci transmission from pigeons to humans.

We aimed to express and purify three rabies virus glycoproteins with different tags and sizes. After analyzing their binding function, we wish to obtain a rabies virus glycoprotein with higher affinity and ability to specifically bind memory B cells. Experiments were carried out to express full length, as well as the ectodomain RVG by gene engineering method. Combined with the antibody of CD19 and CD27, the candidate protein labeling with fluorescence was used to analyze its binding function. Flow cytometry was used to detect the anti-rabies virus specific memory B cells in PBMCs, and confirm the binding ability between the candidate proteins and anti-rabies virus-specific memory B cells. We successfully constructed three expression vectors pGEX-5X-1-RVG, pET28a-RVG and pET30a-G. Three glycoproteins GST-RVG, His-RVG and His-G were obtained by optimized expression and purification conditions. The antigen specificity of purified GST-RVG, His-RVG and His-G were identified by Western blotting and ELISA. The affinity of these three purified glycoproteins to anti-rabies virus antibody were detected by competitive ELISA. Anti-rabies virus specific memory B cells in positive PBMCs gained from people who had ever been injected with the vaccine can be detected by flow cytometry. Thus, we got a recombinant rabies virus glycoprotein that had high-affinity and could sort antigen specific memory B cells.

Indoleamine 2,3-dioxygenase (IDO) is a kind of immune regulation enzyme.IDO is the only rate-limiting enzyme that can catalyze the oxidative clearage of indole ring in tryptophan and its catabolism along the kynurenine pathway.IDO1 is one of the important mechanisms in maternal immune tolerance,which participates in the regulation of maternal-fetal immune relationship.The newly discovered IDO2 also plays an important role in this relationship.The abnormal expression of IDO2 is associated with the male infertility.