Bilineage embryo-like structure from EPS cells can produce live mice with tetraploid trophectoderm

Self-organized blastoids from extended pluripotent stem (EPS) cells possess enormous potential for investigating postimplantation embryo development and related diseases. However, the limited ability of postimplantation development of EPS-blastoids hinders its further application. In this study, single-cell transcriptomic analysis indicated that the "trophectoderm (TE)-like structure" of EPS-blastoids was primarily composed of primitive endoderm (PrE)-related cells instead of TE-related cells. We further identified PrE-like cells in EPS cell culture that contribute to the blastoid formation with TE-like structure. Inhibition of PrE cell differentiation by inhibiting MEK signaling or knockout of Gata6 in EPS cells markedly suppressed EPS-blastoid formation. Furthermore, we demonstrated that blastocyst-like structures reconstituted by combining the EPS-derived bilineage embryo-like structure (BLES) with either tetraploid embryos or tetraploid TE cells could implant normally and develop into live fetuses. In summary, our study reveals that TE improvement is critical for constructing a functional embryo using stem cells in vitro.

Efficacy and safety of low-dose hydrocortisone for the prevention and treatment of bronchopulmonary dysplasia in very premature infants：a meta-analysis / 中国药房

OBJECTIVE To systematically evaluate the efficacy and safety of prophylactic use of low-dose hydrocortisone （HC） for the prevention and treatment of bronchopulmonary dysplasia （BPD）， and to provide evidence-based reference for clinical treatment. METHODS PubMed， Embase， Web of Science， Cochrane Library， CJFD， VIP and Wanfang databases were searched by computer； randomized controlled trials （RCT） about prophylactic use of low-dose HC （trial group） versus placebo or dopamine （control group） in very premature infants were collected from the establishment of the database to Jun. 2022. The quality of the included literature was evaluated by using bias risk assessment tool recommended by Cochrane system evaluator’s manual （version 6.2） after screening the literature and extracting the data. Meta-analysis， sensitivity analysis and publication bias analysis were carried out with RevMan 5.3 statistical software. RESULTS A total of 1 437 very premature infants were included in 9 RCTs. Meta- analysis showed that the incidence of BPD [OR＝0.75， 95%CI（0.58，0.95）， P＝0.02] and fatality [OR＝0.72， 95%CI （0.54， 0.97）， P＝0.03] in trial group were significantly lower than control group； the survival rate without BPD [OR＝1.36， 95%CI （1.06，1.74）， P＝0.02]， the incidences of gastrointestinal perforation [OR＝2.23， 95%CI （1.31，3.78）， P＝0.003] and sepsis [OR＝ 1.27， 95%CI （1.01，1.60）， P＝0.04] in trial group were all significantly higher than control group. There was no significant difference in the incidence of necrotizing enterocolitis， paraventricular leukomalacia， intraventricular hemorrhage， patent ductus arteriosus， hyperglycemia， pneumothorax， retinopathy of premature infants between the two groups （P＞0.05）. Results of sensitivity analysis showed that study results were robust. Results of publication bias analysis showed that there was little possibility of publication bias in this study. CONCLUSIONS The early prophylactic use of low-dose HC can reduce BPD in very premature infants， reduce fatality， and improve the survival rate without BPD， but we should pay attention to gastrointestinal perforation and sepsis.

Detection and clinical significance of C reactivn protein and P-selectin in patients with ulcerative colitis / 中国基层医药

Objective To study the detection and clinical signitlcanee of C reactivn protein(ClIP)and P-seleetin(P-sel)in patients with ulcerative colitis(UC).Methods The levels of peripheral blood ClIP and P-sel in patients with UC(n=53)and normal control group(n=35)were detected and the effects on disease severity were analyzed subsequently.Results The levels of blood CRP and P-sel in active phase group were significantly higher than those in catabasis group and normal controls group(P＜0.05);severe stage and medium stage were signiticandy higher than those in mild stage(P＜0.05,P＜0.01),severe stage was significantly higher than those in medium stage(P＜0.05);the blood level of CRP was positively related to P-sel in active phase group(r=0.638,P＜0.01).Conclusion CRP and P-sel were correlated with invasion and severity of UC.