Objective To screen and determine the effective silencing targets of β2-microglobulin(B2m)gene at the cellular level in marmoset.Methods By homology comparison of the b2m gene in human and the B2m gene in marmoset, choose homology small hairpin RNA(shRNA)sequences targeting marmoset B2m gene were designed, We choose homology small hairpin RNA(shRNA)sequences targeting designed B2m gene to make homology analysis, and insert into lentivirus-based gene silencing constructs FUGW-TDT.The vectors were transfected into HEK293T cells induced by polyethylenimine(PEI).The suppression of B2m mRNA was detected by real-time PCR.Results Two gene-silencing sequences were screened that lied in 290~310 bp and 665~685 bp of the marmoset B2m mRNA, and have statistical significance in the silencing rate:(46.54±7.91)% (P < 0.05) and(83.22±4.37)%(P < 0.0001).Conclusions Two effective silencing target sequences are screened at cellular level, which can be further used in studies on gene silencing in marmoset.

Objective To examine hematological and biochemical parameters in 30 common marmosets,count the mean and standard deviations of each index, and analyze significant differences between female and male groups. Additionally,data from marmosets and macaque breeding were compared. Methods Blood was collected through the posterior limb vein while animals were awake. Hematology and serum biochemical indices were then measured with an automatic blood cell analyzer and blood biochemical analyzer, followed by statistical testing. Results No significant differences were measured in hematological indices between male and female groups. There was a significant difference between the female and male group in serum biochemical indices including high-density lipoprotein-cholesterol(HDL-C) and low-density lipoprotein-cholesterol(LDL-C)(P < 0.05). Compared with the foreign marmoset group, HGB, MCHC,NEUT,ALT, AST, and GLOB were visibly increased in the group of marmosets fed by our institution, but in accordance with the data range in rhesus monkeys. Conclusions Hematological and serum biochemical indices of common marmosets have been detected in this study and compared with related data in macaques and marmosets. Our findings provide basic data not only for pharmacological and toxicological studies,but also diagnosis and treatment of diseases.

Objective To screen and optimize the microsatellite DNA primers of the laboratory common marmoset, analyze and evaluate the population genetic quality for the marmosets (Callithrix jacchus) introduced into the Institute of Medical Laboratory Animal science, Chinese Academy of Medical Sciences. Methods A total of 30 marmosets were randomly chosen, and their genome DNA from blood was extracted using phenol/chloroform method. The microsatellite DNA was amplified using standard polymerase chain reaction (PCR). The amplification products were tested by STR scanning after 2% agrose gel and 8% PAGE electrophoresis. The data processing and genetic analysis were completed using the Popgene1. 32 software. Results A total of 20 pairs of microsatellite loci showed genetic polymorphism, and 147 alleles were detected. The number of allele was 5 to 10, average 7. 35. The effective allele was 2. 2500 to 6. 3830, average 4. 0402. The observed heterozygosity was 0. 000 to 0. 4667, average 0. 1533. The expected heterozygosity was 0. 1424 to 0. 4350, average 0. 2506. The Shannon diversity index was 1. 2242 to 2. 0324, average 1. 5949. The polymorphic information content was 0. 5366 to 0. 8254, average 0. 7053. Conclusions The 20 pairs of marmoset microsatellite primers are genetically highly diverse and are in a Hardy-Weinberg equilibrium.

Objective To purify marmoset serum IgG, prepare and identify the antiserum and the rabbit anti-marmoset antibody IgG-HRP (horseradish peroxidase). Methods Using SDS-PAGE analysis to identify the serum IgG from HiTrapTM Protein G. The antiserum titer was determined by double immunodiffusion assay. The rabbit anti-marmoset IgG was labeled with HRP by improved sodium periodate method. ELISA and western blotting were used to evaluate the concentration and specificity of rabbit anti-marmoset IgG-HRP. Results The purity of purified marmoset serum IgG determined by SDS-PAGE was higher than 95% , and the anti-serum titer of the anti-marmoset IgG polyclonal antibody was 1∶64. The concentration of rabbit anti-marmoset IgG-HRP identified by direct ELISA was 1∶256 000, and that by western-blotting was 1∶15 000, with a strong specificity. Conclusions The IgG-HRP marker antibody is prepared and the specificity and concentration are identified by ELISA and western blotting. It reserves the resources for the detection system of marmoset pathogens and the molecular immunological testing system.

The main function of anterior cruciate ligament (ACL) is to maintain stability of the knee joint and prevent anterior displacement of the tibial plateau. ACL injury accounts for more than 50% of the knee joint injuries. If not timely handled, it will increase the risk of secondary injuries to structures such as the meniscus and cartilage, causing chronic pain and degeneration of the knee joint. Although most ACL injuries can be determined by their direct signs on MRI, the identification of complex situations and partial tears of ACL are still not satisfactory, which subsequently affects treatment strategies. After ACL injury, changes in anatomical relationship of the knee joint can also lead to morphological changes in other structures such as the posterior cruciate ligament (PCL) on MRI, and these indirect signs can assist in the diagnosis of ACL injury. The authors reviewed the application of MRI-related indicators of PCL in diagnosing ACL injury, hoping to provide references and new ideas for clinical decision-making.