No abstract available.
Glutamine*

OBJECTIVE: The purpose of this study was to examine the effects on in vitro development of early preimplantation mouse embryos in DMEM medium with glutamine which was controlled by different composition of glucose and pyruvate. METHODS: Four hundred and nineteen mouse 2-cell embryos were cultured in four different media with different composition of glucose and pyruvate for 96 hours. The DMEM-G contained L-glutamine for energy sources was used for control group. Group I embryos were cultured in the medium that mixed one volume of DMEM-GGP contained L-glutamine, D-glucose and sodium pyruvate for energy sources with three volume of DMEM-G, and group II embryos were cultured in the medium that mixed with same volume of DMEM-G and DMEM-GGP, and group III embryos were cultured in DMEM-GGP. RESULTS: At 24 hours, the development into >or=3-cell was significantly higher (p<0.05) in group I (93.3%) than control (84.6%). The development into >or=8-cell was significantly higher in group I (73.1%) than control (44.2%), group II (59.6%) and III (45.8%), and also group II was significantly higher than control and group III. At 48 hours, the development into >or=morula was significantly higher in group I (90.4%) and II (86.5%) than control (73.0%). However, the development into blastocyst, in group III (15.0%) was significantly lower than control, group I and II. At 72 hours, the development into >or=expanded blastocyst was significantly higher in group I (69.2%) than group III (47.7%), and total blastocyst was significantly higher in group I (80.8%) than control (66.3%) and group III (67.3%). At 96 hours, the development into >or=hatching blastocyst was significantly higher in group I (78.8%) than control (61.5%) and group III (57.9%), and also, total blastocyst was significantly higher in group I (85.6%) than control (69.2%) and group III (72.0%). CONCLUSION: The development of early preimplantation mouse embryos cultured in group I medium that mixed one volume of DMEM-GGP with three volume of DMEM-G was better than other groups during the culture period.
Animals ; Blastocyst* ; Embryonic Structures ; Glucose* ; Glutamine* ; Mice* ; Pyruvic Acid* ; Sodium

Rapidly proliferating cancer cells require energy and cellular building blocks for their growth and ability to maintain redox balance. Many studies have focused on understanding how cancer cells adapt their nutrient metabolism to meet the high demand of anabolism required for proliferation and maintaining redox balance. Glutamine, the most abundant amino acid in plasma, is a well-known nutrient used by cancer cells to increase proliferation as well as survival under metabolic stress conditions. In this review, we provide an overview of the role of glutamine metabolism in cancer cell survival and growth and highlight the mechanisms by which glutamine metabolism affects cancer cell signaling. Furthermore, we summarize the potential therapeutic approaches of targeting glutamine metabolism for the treatment of numerous types of cancer.
Cell Survival ; Glutamine ; Metabolism ; Oxidation-Reduction ; Plasma ; Stress, Physiological

The α-amino acid ester acyltransferase (SAET) from Sphingobacterium siyangensis is one of the enzymes with the highest catalytic ability for the biosynthesis of l-alanyl-l-glutamine (Ala-Gln) with unprotected l-alanine methylester and l-glutamine. To improve the catalytic performance of SAET, a one-step method was used to rapidly prepare the immobilized cells (SAET@ZIF-8) in the aqueous system. The engineered Escherichia coli (E. coli) expressing SAET was encapsulated into the imidazole framework structure of metal organic zeolite (ZIF-8). Subsequently, the obtained SAET@ZIF-8 was characterized, and the catalytic activity, reusability and storage stability were also investigated. Results showed that the morphology of the prepared SAET@ZIF-8 nanoparticles was basically the same as that of the standard ZIF-8 materials reported in literature, and the introduction of cells did not significantly change the morphology of ZIF-8. After repeated use for 7 times, SAET@ZIF-8 could still retain 67% of the initial catalytic activity. Maintained at room temperature for 4 days, 50% of the original catalytic activity of SAET@ZIF-8 could be retained, indicating that SAET@ZIF-8 has good stability for reuse and storage. When used in the biosynthesis of Ala-Gln, the final concentration of Ala-Gln reached 62.83 mmol/L (13.65 g/L) after 30 min, the yield reached 0.455 g/(L·min), and the conversion rate relative to glutamine was 62.83%. All these results suggested that the preparation of SAET@ZIF-8 is an efficient strategy for the biosynthesis of Ala-Gln.
Escherichia coli/genetics* ; Glutamine ; Zeolites/chemistry* ; Amino Acids

Oral immunosuppression caused by smoking creates a microenvironment to promote the occurrence and development of oral mucosa precancerous lesions. This study aimed to investigate the role of metabolism and macrophage polarization in cigarette-promoting oral leukoplakia. The effects of cigarette smoke extract (CSE) on macrophage polarization and metabolism were studied in vivo and in vitro. The polarity of macrophages was detected by flow cytometric analysis and qPCR. Liquid chromatography-mass spectrometry (LC-MS) was used to perform a metabolomic analysis of Raw cells stimulated with CSE. Immunofluorescence and flow cytometry were used to detect the polarity of macrophages in the condition of glutamine abundance and deficiency. Cell Counting Kit-8 (CCK-8), wound-healing assay, and Annexin V-FITC (fluorescein isothiocyanate)/PI (propidium iodide) double-staining flow cytometry were applied to detect the growth and transferability and apoptosis of Leuk-1 cells in the supernatant of Raw cells which were stimulated with CSE, glutamine abundance and deficiency. Hyperkeratosis and dysplasia of the epithelium were evident in smoking mice. M2 macrophages increased under CSE stimulation in vivo and in vitro. In total, 162 types of metabolites were detected in the CSE group. The metabolites of nicotine, glutamate, arachidic acid, and arginine changed significantly. The significant enrichment pathways were also selected, including nicotine addiction, glutamine and glutamate metabolism, and arginine biosynthesis. The results also showed that the supernatant of Raw cells stimulated by CSE could induce excessive proliferation of Leuk-1 and inhibit apoptosis. Glutamine abundance can facilitate this process. Cigarette smoke promotes oral leukoplakia via regulating glutamine metabolism and macrophage M2 polarization.
Animals ; Glutamine ; Leukoplakia, Oral ; Macrophages ; Mice ; Smoking ; Tumor Microenvironment

Wound is the most fundamental issue of burn injury, and its repair depends not only on effective wound treatment, but also on the good nutritional status of burned patients. Nutrition support is an important means to improve the nutritional status of patients and promote wound healing, and how to make it match the metabolism of burn wounds is a difficult task of nutrition therapy. In this paper, we analyzed the metabolic characteristics of different stages in burn wound healing, focused on the metabolic characteristics of glucose, protein, and glutamine in these stages, and proposed a nutritional strategy that is compatible with wound healing in order to maximize the role of nutrition therapy in wound repair.
Burns/therapy* ; Glutamine ; Humans ; Nutritional Support ; Proteins/metabolism* ; Wound Healing

Nutritional therapy is an important determinant of immune function in burn patients. However, common nutritional supplement given to patients with extensive deep burn is still therapeutically inefficient to block nutrients utilization due to metabolic disorder. Immunonutrition, a new nutrition therapeutic modality, has been used in severely burned patients for regulating cell function, improving metabolic state, and enhancing immune function. Glutamine (Gln) is often considered to be a prime immunonutrient in immunonutrition therapy for critically ill patients including those with serious burns. Our series of experimental and clinical studies have demonstrated that Gln administered in animals or patients could abate intestinal injury, accelerate repair of intestinal mucosa, improve nitrogen balance, abate immunosuppression, maintain immune homeostasis, ameliorate wound healing, and shorten hospital stay. Although the use of Gln for supportive care of severely burned patients is now well established, the science of its use is still in its infancy. There are some disputes in regard to its indication, dosage, and course of treatment, and the way of its supplementation, administration opportunity especially. These questions will be discussed in this paper, and we wish to propose the principle and method of administration of Gln in severely burned patients.
Burns ; metabolism ; therapy ; Glutamine ; therapeutic use ; Humans ; Nutritional Status ; Nutritional Support ; methods

BACKGROUND: Angiogenin, a 14.1-kDa protein isolated from the medium conditioned by HT-29 human colon carcinoma cells, induces the angiogenesis. In contrast to the human angiogenin, thought to have one homologue, the mouse angiogenin is known to have several angiogenin homologues. During we were investigating the target genes, overexpressed by the chimeric PAX3/FKHR transcription factor, new gene closely similar to the mouse angiogenin rather than angiogenin itself was obtained. We report this Ang-vl gene to understand the process of angiogenesis by comparing the mouse angiogenin family genes. METHODS: The representational difference analysis was used to investigate the target genes over expressed by the PAX3/FKHR chimeric transcription factor. The target genes were subcloned into the pBluescriptSK + and sequenced using the 73 and 77 vector itself primers. Analyses of the completed consensus nucleic acid and peptide sequences were performed using the intelligenetics and GCG software packages as well as BLAST algorithms. RESULTS: The Ang-vl gene, including the glutamine that becomes the N-terminal amino acid by the post-translational peptidase reaction and stop codon, was obtained. CONCLUSIONS: We cloned the one member of the mouse angiogenin family genes. From the point of protein chemistry, the mechanism of angiogenin or, for that matter, of any other blood vessel inducing proteins is not yet known. However, the homologues of the angiogenin might interact each other to regulate the angiogenesls. In this regard, the Ang-vl gene provides an opportunity to understand the mechanism of angiogenesis.
Animals ; Blood Vessels ; Chemistry ; Clone Cells ; Codon, Terminator ; Colon ; Consensus ; Glutamine ; Humans ; Mice* ; Transcription Factors*

PURPOSE: Anastomotic leakage in colorectal surgery is a very important issue. Although many studies have shown the positive effects of enteral glutamine (Gln) on anastomotic healing, none has assessed the effects of administering Gln via an enema for anastomotic healing. To fill this study gap, this study investigated the intraluminal effect of administration of Gln enema on the healing of colonic anastomosis in a rat model. METHODS: Thirty Wistar albino rats were divided into three groups containing 10 rats each and were subjected to distal left colon transection and anastomosis. Postoperatively, group I (the control group) was administered no treatment, group II was administered daily placebo enemas containing physiological saline, and group III was administered daily 2% L-Gln enemas. After sacrifice on postoperative day 5, anastomotic healing, burst pressure, tissue hydroxyproline levels, and histological parameters were measured, and group values were compared via statistical analysis. RESULTS: Group III was found to have the highest mean bursting pressure and tissue hydroxyproline levels and the lowest mean ischemia score. While the values of these parameters were not found to differ significantly among the groups, the lack of significance may have been due to the limited number of subjects examined. CONCLUSION: Administration of a Gln enema may have a positive effect on anastomosis in terms of bursting pressure and histopathological parameters. Future research should examine administration of a preoperative Gln enema as a means of decreasing the traumatic effects of the enema and identifying its applicability in surgical practice.
Anastomosis, Surgical ; Anastomotic Leak ; Animals* ; Colon* ; Colorectal Surgery ; Enema* ; Glutamine* ; Hydroxyproline ; Ischemia ; Models, Animal ; Rats

OBJECTIVE: To evaluat the effects of a culture medium with glucose in the presence of glutamine on the development of mouse embryos. METHODS: Two-cell embryos recovered from ICR mice at 48 hrs after hCG injection (mated just after hCG injection) were cultured in DMEM (with 20% hFF) supplemented with or without glucose on the presence of glutamine. Embryos were cultured under three different glucose regimens: (1) 0 mM (control); (2) 0.5 mM (group I); or (3) 3.15 mM (group II), and were analyzed at 24, 48, 72 and 96 hours intervals. Chi-square test (x2-test) was used to compare values of groups. RESULTS: No differences were found in the number of embryos showing morula (control: 37.5%; group I: 51.0%; group II: 48.4%), blastocyst (control: 21.5%; group I: 33.3%; group II: 34.4%) and blastocyst and hatching or hatched blastocyst (control: 81.9%; group I: 83.3%; group II: 82.8%) between groups at 24 hrs, 48 hrs or 72 hrs respectively. However at 96 hrs, the number of hatched and attached blastocyst was significantly higher in group I (82.3%) and II (78.5%) than control (63.2%; P<0.05). CONCLUSION: The addition of glucose (0.5 mM) to the DMEM, as energy source, improved the rate of development of late stage embryos in mice.
Animals ; Blastocyst ; Eagles* ; Embryonic Development* ; Embryonic Structures* ; Female ; Glucose* ; Glutamine* ; Mice* ; Mice, Inbred ICR ; Morula ; Pregnancy