[Progress on spermatogonial stem cells of large animals].

Spermatogonial stem cells (SSCs) are male germline stem cells that reside in the basement membrane of the seminiferous tubule in the testis. SSCs are characterized by their capability of self-renewal to maintain the stem cell pool throughout the lifespan and commitments to germ line after puberty, thus transmitting the genetic information from parents to the SSC-derived progenies. SSCs can be isolated from testis, propagated in vitro, and induced to differentiate into varied germ cells.

[Progress and application of genome-edited pigs in biomedical research].

Genome editing technologies (GETs) can precisely alter the genomic sequences and modify the genetic information at the target site of an organism. Since the beginning of the 21st century, the GETs, including zinc finger nucleases (ZFN), transcription-activating-like receptor factor (TALEN), and clustered regularly interspaced short palindromic repeats/Cas endonucleases (CRISPR/Cas), have been successively developed. The GETs can easily engineer the targeted genomic site of animals to exhibit a desired phenotype(s), thereby providing valuable tools in biomedical research.

Advances in site-specific integration of transgene in animal genome.

The traditional transgenic technologies, such as embryo microinjection, transposon-mediated integration, or lentiviral transfection, usually result in random insertions of the foreign DNA into the host genome, which could have various disadvantages in the establishment of transgenic animals. Therefore, a strategy for site-specific integration of a transgene is needed to generate genetically modified animals with accurate and identical genotypes. However, the efficiency for site-specific integration of transgene is very low, which is mainly caused by two issues.

Establishment of porcine Xist knockout model using CRISPR/Cas9 system.

Somatic cell nuclear transfer technique has great applications in livestock breeding, production of genetically modified animals, rescue of endangered species and treatment of human diseases. However, the currently low efficiency in animals cloning, an average of less than 5%, greatly hindered the rapid development of this technique. Among many factors which affect the efficiency of cloning pigs, X chromosome inactivation is an important one.

Space-bound optical source for satellite-ground decoy-state quantum key distribution.

Satellite-ground quantum key distribution has embarked on the stage of engineering implementation, and a global quantum-secured network is imminent in the foreseeable future. As one payload of the quantum-science satellite which will be ready before the end of 2015, we report our recent work of the space-bound decoy-state optical source. Specialized 850 nm laser diodes have been manufactured and the integrated optical source has gotten accomplished based on these LDs.

Transgenic expression of human cytoxic T-lymphocyte associated antigen4-immunoglobulin (hCTLA4Ig) by porcine skin for xenogeneic skin grafting.

Porcine skin is frequently used as a substitute of human skin to cover large wounds in clinic practice of wound care. In our previous work, we found that transgenic expression of human cytoxicT-lymphocyte associated antigen4-immunoglobulin (hCTLA4Ig) in murine skin graft remarkably prolonged its survival in xenogeneic wounds without extensive immunosuppression in recipients, suggesting that transgenic hCTLA4Ig expression in skin graft may be an effective and safe method to prolong xenogeneic skin graft survival. In this work, using a transgene construct containing hCTLA4Ig coding sequence under the drive of human Keratine 14 (k14) promoter, hCTLA4Ig transgenic pigs were generated by somatic nuclear transfer.

[Plasma concentrations of vascular endothelial growth factor and tissue factor in children with acute lymphoblastic leukemia].

Objective: To detect plasma concentrations of vascular endothelial cell growth factor (VEGF) and tissue factor (TF) in children with acute lymphoblastic leukemia (ALL) and explore their clinical significance in ALL.

Methods: Thirty-three children with newly diagnosed ALL, including 18 cases of low risk, 7 cases of moderate risk and 8 cases of high risk, were enrolled in this study. Twenty-five patients received a complete remission and 8 cases were in non-remission after conventional remission induction chemotherapy.

[Expression of survivin and P63 protein in B cell non-Hodgkin's lymphoma and their effects on cell apoptosis and proliferation].

The study was aimed to explore the possible roles of survivin and P63 protein in the development and progression of B cell non-Hodgkin's lymphoma (B-NHL) and their relation with cell apoptosis and proliferation. TdT-mediated dUTP nick end labeling (TUNEL) and immunohistochemistry were used to detect the survivin and P63 protein expression, cell apoptosis and proliferating cell nuclear antigen (PCNA) level in 43 cases of B-NHL and 10 cases of reactive hyperplasia lymphoid (RHL) tissues. The results indicated that the positive rates of survivin and P63 protein expression were 69.

[A study on the expression of myeloid cell leukemia 1 proteins and survivin and their relation with B cell apoptosis in non-Hodgkin's lymphoma].

Objective: To explore the expression of myeloid cell leukemia 1 (MCL-1) proteins and survivin and its correlation with cell apoptosis as well as with the development and progression of B cell non-Hodgkin's lymphoma (B-NHL).

Methods: TdT-mediated dUTP nick end labeling and immunohistochemistry were used to study cell apoptosis and expression of MCL-1 proteins and survivin proteins in 43 patients with B-NHL and 10 with reactive hyperplasia (RH) lymphoid tissue.

Results: The positive rate of MCL-1 proteins and survivin proteins was 58.