Protocol to identify small-molecule inhibitors against cancer drug resistance.

Drug resistance has emerged as a critical challenge in clinical cancer treatment. Here, we present a high-throughput screening protocol to identify therapeutic small-molecule inhibitors against drug-resistant cancer cells. We detail the steps for constructing drug-resistant cell models, executing the chemical screening process, and performing data analysis and validation.

[Application of metagenomic next-generation sequencing of bronchoalveolar lavage fluid in the diagnosis and treatment of refractory pneumonia in children].

Objectives: To investigate the clinical application of metagenomic next-generation sequencing (mNGS) of bronchoalveolar lavage fluid (BALF) in the etiological diagnosis and treatment of refractory pneumonia (RTP) in children.

Methods: A retrospective analysis was performed on 160 children with RTP who were admitted to the Department of Pediatric Internal Medicine, Maternal and Child Health Hospital of Inner Mongolia Autonomous Region, from January 2020 to March 2023. According to whether mNGS was performed, they were divided into two groups: mNGS (=80) and traditional testing (=80).

[Bone marrow mesenchymal stem cells to repair the reproductive system of male azoospermia rats].

Objective: To study the ability of bone marrow mesenchymal stem cells (BMSCs) to repair the internal environment of the testis in male azoospermia rats.

Methods: We established azoospermia models in 22 six-week-old male SD rats by intraperitoneal injection of busulfan at 20 mg per kg body weight. We transplanted allogeneic rat BMSCs (rBMSCs) into the testicular seminiferous tubules of the model rats and, 30 days after transplantation, observed the composition and structure of the seminiferous tubular cells by HE staining and detected the expressions of CD44, CD106, and c-kit in the rBMSCs by immunohistochemistry.

[Production of transgenic embryos through nuclear transfer using ovine fetal fibroblasts transferred with foreign genes].

Human ALR gene sequence was amplified by PCR from human total DNA and inserted into pIRES(2)-EGFP vector. The bicistronic eukaryotic expression vector, pIRES-EGFP/ALR, expressing EGFP, Neo(r) and ALR genes was constructed. Sheep fetal fibroblast cells (sEFCs) were transfected with pIRES-EGFP/ALR by the induction of lipofectAMINE(TM).