Distance effect characteristic of the matrix attachment region increases recombinant protein expression in Chinese hamster ovary cells.

Objectives: Previously, we have found that the matrix attachment region (MAR) may confer a 'distance effect' on transgene expression. This work aims to systematically explore the increased transgene expression in transfected Chinese hamster ovary (CHO) cells due to the characteristics of MAR and its mechanism.

Results: Compared with the control vector, 500 and 1000 bp DNA distances between MAR and the cytomegalovirus promoter can increase transgene expression by 1.

Shortened nuclear matrix attachment regions are sufficient for replication and maintenance of episomes in mammalian cells.

Matrix attachment regions (MARs) can mediate the replication of vector episomes in mammalian cells; however, the molecular mode of action remains unclear. Here, we assessed the characteristics of MARs and the mechanism that mediates episomal vector replication in mammalian cells. Five shortened subfragments of β-interferon MAR fragments were cloned and transferred into CHO cells, and transgene expression levels, presence of the gene, and the episomal maintenance mechanism were determined.

[Preparation of a Nutritional Slow-release Packing Material with Function Microorganisms and Its Characteristics Evaluation].

A nutritional slow-release packing material with function microorganisms (SC) was prepared using emulsification and the cross-linked method. Its potential as packing material in biotrickling filters (BTF) for butyl acetate removal was evaluated. The physicochemical properties show that the packing has a porosity of 92.

Transmembrane protein GRINA modulates aerobic glycolysis and promotes tumor progression in gastric cancer.

Background: Recent observations indicate a decreased cancer risk in patients with Alzheimer's disease (AD). AD is a severe neurodegenerative disorder characterized by progressive cognitive decline. The 8q24 region has been shown to be involved in AD aetiology.

Construction strategies for developing expression vectors for recombinant monoclonal antibody production in CHO cells.

Recent years have seen the use of recombinant proteins in the treatment of different diseases. Among them, monoclonal antibodies (mAbs) are currently the fastest growing class of bio-therapeutic recombinant proteins. Chinese hamster ovary (CHO) cells are the most commonly used host cells for production of these recombinant mAbs.

[Medication regularity and potential targets of Professor XU Jing-fan's prescription for treating ulcerative colitis].

Ulcerative colitis (UC) is a chronic nonspecific inflammation mainly involving rectum and colon mucosa, which seriously affects the health and quality of life of patients, and is listed as one of modern refractory diseases by WHO. Professor XU Jing-fan, a great master of traditional Chinese medicine, has accumulated rich experiences in the treatment of UC. The study collected Professor XU's 77 prescriptions of treating UC, analyzed the frequency of traditional Chinese medicines and there categories, and investigated the medication regularity by the system clustering method.

SV40 intron, a potent strong intron element that effectively increases transgene expression in transfected Chinese hamster ovary cells.

Chinese hamster ovary (CHO) cells have become the most widely utilized mammalian cell line for the production of recombinant proteins. However, the product yield and transgene instability need to be further increased and solved. In this study, we investigated the effect of five different introns on transgene expression in CHO cells.

Keratin17 Promotes Tumor Growth and is Associated with Poor Prognosis in Gastric Cancer.

Krt17 is a 48kDa protein member of keratin family. Previous literatures have demonstrated Krt17 may play a promotive role in the progression of various malignancies. However, the exact function of Krt17 in the carcinogenesis and the progression of gastric cancer (GC) remains unknown.

[Discussion about risk and management of Chinese patent medicine with double identity].

Chinese patent medicine with double identity was a special phenomenon, and many preparations not only were prescription drugs but also over the counter ( OTC) drugs, which brought a lot of trouble. Based on statistics of list of OTC medicines of CFDA, related varieties, route of administration and functions of these drugs were searched. The causes of insufficient were analyzed and the potential risk was investigated.

[Simultaneous determination of phenolic acids in Guanxinning injection by HPLC].

This paper was aim to determine five phenolic acids, sodium danshensu (SD), protocatechuic aldehyde (PA), rosmarinic acid (RA), lithospermic acid (LA) and salvianolic acid B (SAB), in Guanxinning injection. In the test, Kromasil C18 column (4.6 mm x 250 mm, 5 µm) was adopted, with acetonitrile-3% formic acid solution as the mobile phase for gradient elution.

Osmotic demyelination syndrome after correction of severe hyponatremia associated with pituitrin.

Osmotic demyelination syndrome (ODS) may be precipitated by aggressive correction of a hypoosmolar state. We report the case of a 24-year-old woman who developed ODS during rapid correction of asymptomatic hyponatremia caused by pituitrin prescribed for hemoptysis. After hyponatremia correction by NaCl supplementation, the patient developed limb weakness, blurred vision, hand and perioral numbness, and lisp.

Influence of P-glycoprotein on brucine transport at the in vitro blood-brain barrier.

Brucine is a central agonist that can pass through the blood-brain barrier (BBB). The goal of this study is to examine whether brucine is one of the substrates of the drug transporter P-glycoprotein (P-gp) and to examine the effects of P-gp on the brucine transport at the in vitro BBB model. The P-gp ATPase assay was utilized to investigate the in vitro affinity of P-gp to brucine.