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Glutamine AND igf-2

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https://www.readbyqxmd.com/read/28653763/pericentral-hepatocytes-produce-igf-2-to-promote-liver-regeneration-during-special-injuries
#1
Junlai Liu, Xiao Hu, Jie Chen, Xinqi Li, Lu Wang, Binbin Wang, Wenbo Peng, Cuiwei Yang, Zhijie Li, Yan Chen, Yue J Wang, Chuanjiang Li, Xiajun Li, Fang Yan, Yunfang Wang, Changzhen Shang, Xin Wang, Tao Chen, Pengyu Huang
Liver regeneration happens after various types of injuries. Unlike the well-studied liver regeneration caused by partial hepatectomy, there is accumulating evidence suggesting that liver regeneration during other injuries may result from some unknown mechanism. In this study, we found that insulin-like growth factor 2 (IGF-2) was drastically induced following the liver injuries caused by tyrosinemia or long-term treatments of carbon tetrachloride (CCl4 ). However, it was not observed during the early phase of acute liver injuries after partial hepatectomy or single treatment of CCl4 ...
June 27, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28097474/igf-1r-regulates-the-extracellular-level-of-active-mmp-2-pathological-neovascularization-and-functionality-in-retinas-of-oir-mouse-model
#2
Valeria E Lorenc, Paula V Subirada Caldarone, María C Paz, Darío G Ferrer, José D Luna, Gustavo A Chiabrando, María C Sánchez
In ischemic proliferative diseases such as retinopathies, persistent hypoxia leads to the release of numerous neovascular factors that participate in the formation of abnormal vessels and eventually cause blindness. The upregulation and activation of metalloproteinases (MMP-2 and MMP-9) represent a final common pathway in this process. Although many regulators of the neovascular process have been identified, the complete role of the insulin-like growth factor 1 (IGF-1) and its receptor (IGF-1R) appears to be significantly more complex...
January 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/26991744/l-glutamine-improves-skeletal-muscle-cell-differentiation-and-prevents-myotube-atrophy-after-cytokine-tnf-%C3%AE-stress-via-reduced-p38-mapk-signal-transduction
#3
Matthew Girven, Hannah F Dugdale, Daniel J Owens, David C Hughes, Claire E Stewart, Adam P Sharples
Tumour Necrosis Factor-Alpha (TNF-α) is chronically elevated in conditions where skeletal muscle loss occurs. As l-glutamine can dampen the effects of inflamed environments, we investigated the role of l-glutamine in both differentiating C2C12 myoblasts and existing myotubes in the absence/presence of TNF-α (20 ng · ml(-1) ) ± l-glutamine (20 mM). TNF-α reduced the proportion of cells in G1 phase, as well as biochemical (CK activity) and morphological differentiation (myotube number), with corresponding reductions in transcript expression of: Myogenin, Igf-I, and Igfbp5...
December 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/26291679/benzo-%C3%AE-pyrene-induced-oxidative-stress-in-caenorhabditis-elegans-and-the-potential-involvements-of-microrna
#4
Hongmei Wu, Chenping Huang, Faten A Taki, Yanqiong Zhang, Dorothy L Dobbins, Lin Li, Hongtao Yan, Xiaoping Pan
In the present study oxidative stress induced by Benzo-α-pyrene (BaP) exposure and the potential involvements of microRNA were investigated. The Caenorhabditis elegans (C. elegans) was applied as model organism. The C. elegans at L1-stage were randomly divided into 4 groups and exposed to 0, 0.2, 2.0, and 20μM BaP for 30h. Expressions of SKiNhead-1 (SKN-1), gamma-glutamine cysteine synthase heavy chain (GCS-1), and their potential regulatory factors in insulin/IGF-1/FOXO signaling pathway and the p38 MAPK pathway were analyzed...
November 2015: Chemosphere
https://www.readbyqxmd.com/read/26203267/linking-diet-to-acne-metabolomics-inflammation-and-comedogenesis-an-update
#5
REVIEW
Bodo C Melnik
Acne vulgaris, an epidemic inflammatory skin disease of adolescence, is closely related to Western diet. Three major food classes that promote acne are: 1) hyperglycemic carbohydrates, 2) milk and dairy products, 3) saturated fats including trans-fats and deficient ω-3 polyunsaturated fatty acids (PUFAs). Diet-induced insulin/insulin-like growth factor (IGF-1)-signaling is superimposed on elevated IGF-1 levels during puberty, thereby unmasking the impact of aberrant nutrigenomics on sebaceous gland homeostasis...
2015: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/25945744/alanyl-glutamine-attenuates-5-fluorouracil-induced-intestinal-mucositis-in-apolipoprotein-e-deficient-mice
#6
C V Araújo, C R Lazzarotto, C C Aquino, I L Figueiredo, T B Costa, L A de Oliveira Alves, R A Ribeiro, L R Bertolini, A A M Lima, G A C Brito, R B Oriá
Apolipoprotein E (APOE=gene, apoE=protein) is a known factor regulating the inflammatory response that may have regenerative effects during tissue recovery from injury. We investigated whether apoE deficiency reduces the healing effect of alanyl-glutamine (Ala-Gln) treatment, a recognized gut-trophic nutrient, during tissue recovery after 5-FU-induced intestinal mucositis. APOE-knockout (APOE-/-) and wild-type (APOE+/+) C57BL6J male and female mice (N=86) were given either Ala-Gln (100 mM) or phosphate buffered saline (PBS) by gavage 3 days before and 5 days after a 5-fluorouracil (5-FU) challenge (450 mg/kg, via intraperitoneal injection)...
June 2015: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/25885794/estrogen-receptor-%C3%AE-up-regulates-igf1r-expression-and-activity-to-inhibit-apoptosis-and-increase-growth-of-medulloblastoma
#7
Clifford J Cookman, Scott M Belcher
Medulloblastoma (Med) is the most common malignant brain tumor in children. The role of ESR2 [estrogen receptor (ER)-β] in promoting Med growth was comprehensively examined in three in vivo models and human cell lines. In a novel Med ERβ-null knockout model developed by crossing Esr2(-/-) mice with cerebellar granule cell precursor specific Ptch1 conditional knockout mice, the tumor growth rate was significantly decreased in males and females. The absence of Esr2 resulted in increased apoptosis, decreased B-cell lymphoma 2 (BCL2), and IGF-1 receptor (IGF1R) expression, and decreased levels of active MAPKs (ERK1/2) and protein kinase B (AKT)...
July 2015: Endocrinology
https://www.readbyqxmd.com/read/25271169/glutamine-stimulates-biosynthesis-and-secretion-of-insulin-like-growth-factor-2-igf2-an-autocrine-regulator-of-beta-cell-mass-and-function
#8
Honey Modi, Marion Cornu, Bernard Thorens
IGF2 is an autocrine ligand for the beta cell IGF1R receptor and GLP-1 increases the activity of this autocrine loop by enhancing IGF1R expression, a mechanism that mediates the trophic effects of GLP-1 on beta cell mass and function. Here, we investigated the regulation of IGF2 biosynthesis and secretion. We showed that glutamine rapidly and strongly induced IGF2 mRNA translation using reporter constructs transduced in MIN6 cells and primary islet cells. This was followed by rapid secretion of IGF2 via the regulated pathway, as revealed by the presence of mature IGF2 in insulin granule fractions and by inhibition of secretion by nimodipine and diazoxide...
November 14, 2014: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/25023391/metabolic-differences-in-hepatocytes-of-obese-and-lean-pigs
#9
L González-Valero, J M Rodríguez-López, M Lachica, I Fernández-Fígares
There are important differences in terms of metabolic activity, energy utilization and capacity of protein and fat deposition when Iberian and modern pigs are compared. Primary culture of hepatocytes was used to evaluate hepatic function and sensitivity to hormones between breeds without the interference of circulating blood factors. Hepatocytes were isolated from pure Iberian (n=10) and Landrace (n=8) pigs of similar BW (24.5±12.1 and 32.9±6.1 kg BW, respectively), by collagenase perfusion. Monolayers were established in medium containing fetal bovine serum for 1 day and switched to serum-free medium for the remainder of the culture period...
November 2014: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/24714829/effects-of-glutamine-alone-or-in-combination-with-zinc-and-vitamin-a-on-growth-intestinal-barrier-function-stress-and-satiety-related-hormones-in-brazilian-shantytown-children
#10
RANDOMIZED CONTROLLED TRIAL
Aldo A M Lima, Gregory M Anstead, Qiong Zhang, Ítalo L Figueiredo, Alberto M Soares, Rosa M S Mota, Noélia L Lima, Richard L Guerrant, Reinaldo B Oriá
OBJECTIVE: To determine the impact of supplemental zinc, vitamin A, and glutamine alone or in combination on growth, intestinal barrier function, stress and satiety-related hormones among Brazilian shantytown children with low median height-for-age z-scores. METHODS: A randomized, double-blind, placebo-controlled trial was conducted in children aged two months to nine years from the urban shanty compound community of Fortaleza, Brazil. Demographic and anthropometric information was assessed...
2014: Clinics
https://www.readbyqxmd.com/read/21713359/-insulin-like-growth-factor-receptor-i-signaling-in-a-breast-cancer-cell-line
#11
Wilson Mejía, Carlos Castro, Adriana Umaña, Clemencia de Castro, Tulia Riveros, Myriam Sánchez-Gómez
INTRODUCTION: In vitro studies strongly suggest that proliferation, migration and cell survival of breast cancer cell lines are significantly affected by activation of the IGF type 1 receptor (IGF-IR). OBJECTIVE: The phosphorylation by IGF-I of IGF-IR and the intracellular signaling molecules Akt (PI-3K pathway) and Erk1/2 (MAPK pathway) was characterized in a human breast cancer cell lines. MATERIALS AND METHODS: The study compared a standard breast adenocarcinoma line (MCF-7) cell line with a line (CSC 1595) derived from an infiltrating ductal breast cancer in a Colombian patient...
October 2010: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/21601263/in-vitro-maturation-and-artificial-activation-of-donkey-oocytes
#12
Gaoping Zhao, Kaifeng Wu, Liang Cui, Lixia Zhao, Yiyi Liu, Xiuwen Tan, Huanmin Zhou
Three media were evaluated for their ability to support in vitro maturation of donkey (Equus asinus) oocytes and their development after parthenogenetic activation. The basal medium for Medium 1 (M1) and Medium 2 (M2) was M199 and DMEM/F12 respectively, whereas, Medium 3 (M3) consisted of equal parts (v/v) of M199 and DMEM/F12. All three media were supplemented with 10% (v/v) fetal calf serum, 0.01 units/mL porcine FSH, 0.01 units/mL equine LH, 200 ng/mL insulin-like growth factor 1(IGF-I), 10 μl/mL insulin-transferrin-selenium (ITS), 0...
September 1, 2011: Theriogenology
https://www.readbyqxmd.com/read/21463799/the-effects-of-an-amino-acid-supplement-on-glucose-homeostasis-inflammatory-markers-and-incretins-after-laparoscopic-gastric-bypass
#13
RANDOMIZED CONTROLLED TRIAL
Igal Breitman, Neha Saraf, Manasi Kakade, Kishore Yellumahanthi, Merritt White, Jo Ann Hackett, Ronald H Clements
BACKGROUND: Protein supplements are routinely used after a laparoscopic gastric bypass (LGB). The aim of this study was to evaluate the impact of an amino acid supplement on glucose homeostasis and hormonal and inflammatory markers after LGB. STUDY DESIGN: Thirty patients undergoing LGB were randomized to receive or not 24 g of an oral supplement containing a leucine metabolite, glutamine, and arginine twice daily. Changes in weight, glucose, insulin, C-peptide, insulin sensitivity, interleukin (IL) 6, C-reactive protein (CRP), leptin, insulin-like growth factor (IGF) 1, ghrelin, and incretins were assessed preoperatively and 2 weeks and 8 weeks postoperatively...
April 2011: Journal of the American College of Surgeons
https://www.readbyqxmd.com/read/18990596/amino-acid-profiles-in-adults-with-growth-hormone-gh-deficiency-before-and-during-gh-replacement-therapy
#14
COMPARATIVE STUDY
R Fernholm, M Thoren, C Hoybye, B Anderstam, Y Pernow, M Saaf, K Hall
OBJECTIVE: GH replacement to growth hormone deficient (GHD) adults improves body composition. In a subset however, lean body mass (LBM) fails to increase despite normalization of IGF-I and amino acid availability could be of importance. We analyzed amino acid (AA) profiles in plasma and erythrocytes (RBC) and associations with LBM, serum IGF-I and IGFBP-1 before and during GH replacement. DESIGN AND METHODS: Examinations were performed in 15 GHD patients (six women), aged 34-61 yrs before and after 12 months of GH therapy and in a control group of 20 healthy males aged 31-68 yrs...
June 2009: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/18635390/glutamine-prevents-dmba-induced-squamous-cell-cancer
#15
V Lim, S Korourian, V K Todorova, Y Kaufmann, V S Klimberg
The etiology of oral squamous cell carcinoma has been linked to environmental carcinogens, such as activated aromatic heterocyclic radicals and epoxides. Our previous work on implantable and 7,12-dimethylbenz[a]anthracene (DMBA)-induced breast cancer showed that oral glutamine (GLN) inhibited tumor growth possibly through stimulation of host - and selective inhibition of tumor glutathione (GSH). This finding was associated with up-regulation of NK cell activity, decreased IGF-1 and TGF-beta in the circulation and downregulation of PI-3K/Akt antiapoptotic signaling in tumors...
February 2009: Oral Oncology
https://www.readbyqxmd.com/read/17709266/frequent-intravenous-pulses-of-growth-hormone-together-with-alanylglutamine-supplementation-in-prolonged-critical-illness-after-multiple-trauma-effects-on-glucose-control-plasma-igf-i-and-glutamine
#16
RANDOMIZED CONTROLLED TRIAL
Frantisek Duska, Michal Fric, Jaroslav Pazout, Petr Waldauf, Petr Tůma, Jan Pachl
OBJECTIVE: We aim to demonstrate that low dose growth hormone (GH) administered in i.v. pulses every 3h is able to normalize IGF-I levels in subjects with prolonged critical illness, after multiple trauma. We also ask whether it is possible to control glycaemia during such a treatment and how alanylglutamine (AG) supplementation influences plasma glutamine concentration. METHODS: We used a prospective double-blind (group 1 vs. 2), randomized trial with an open-label control arm (group 3)...
February 2008: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/17264177/a-familial-insulin-like-growth-factor-i-receptor-mutant-leads-to-short-stature-clinical-and-biochemical-characterization
#17
Kenjiro Inagaki, Anatoly Tiulpakov, Petr Rubtsov, Polina Sverdlova, Valentina Peterkova, Shoshana Yakar, Sergei Terekhov, Derek LeRoith
CONTEXT: IGF-I/IGF-I receptor (IGF-IR) signaling pathways play important roles in longitudinal growth. A novel Arg481Glu (R481Q) mutation in IGF-IR was detected in a family with intrauterine and postnatal growth retardation. OBJECTIVE: The objective of the study was to explore the mechanism whereby the R481Q mutation may be causative in growth retardation. PATIENTS: A 13-yr-old girl with short stature was studied for functional analysis of the R481Q mutation in the IGF-IR...
April 2007: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/16898871/modulation-of-p53-and-c-myc-in-dmba-induced-mammary-tumors-by-oral-glutamine
#18
Valentina K Todorova, Yihong Kaufmann, Shaoke Luo, V Suzanne Klimberg
Previous studies established that oral glutamine (GLN) reduced tumor development in implantable and 7,12-dimethylbenz(a)anthracene (DMBA)-induced breast cancer models. This finding was associated with a decrease in tumor glutathione (GSH) levels, while maintaining normal gut, blood, and breast GSH. Alterations in GSH levels contribute to the control of apoptotic and cell cycle-regulating signaling. The aim of this study was to examine the role of dietary GLN on activation of p53 and c-myc, which play critical roles in cancer development and sensitivity to radiation and chemotherapy...
2006: Nutrition and Cancer
https://www.readbyqxmd.com/read/16513827/recombinant-human-insulin-like-growth-factor-i-treatment-inhibits-gluconeogenesis-in-a-transgenic-mouse-model-of-type-2-diabetes-mellitus
#19
Patricia Pennisi, Oksana Gavrilova, Jennifer Setser-Portas, William Jou, Stefania Santopietro, David Clemmons, Shoshana Yakar, Derek LeRoith
IGF-I and insulin are structurally related polypeptides that mediate a similar pattern of biological effects via receptors that display considerably homology. Administration of recombinant human IGF-I (rhIGF-I) has been proven to improve glucose control and liver and muscle insulin sensitivity in patients with type 2 diabetes mellitus (DM). The effect of rhIGF-I treatment was evaluated in a mouse model of type 2 DM (MKR mouse), which expresses a dominant-negative form of the human IGF-I receptor under the control of the muscle creatine kinase promoter specifically in skeletal muscle...
June 2006: Endocrinology
https://www.readbyqxmd.com/read/16256736/a-role-for-sir-2-1-regulation-of-er-stress-response-genes-in-determining-c-elegans-life-span
#20
Mohan Viswanathan, Stuart K Kim, Ala Berdichevsky, Leonard Guarente
C. elegans SIR-2.1, a member of the Sir-2 family of NAD(+)-dependent protein deacetylases, has been shown to regulate nematode aging via the insulin/IGF pathway transcription factor daf-16. Treatment of C. elegans with the small molecule resveratrol, however, extends life span in a manner fully dependent upon sir-2.1, but independent of daf-16. Microarray analysis of worms treated with resveratrol demonstrates the transcriptional induction of a family of genes encoding prion-like glutamine/asparagine-rich proteins involved in endoplasmic reticulum (ER) stress response to unfolded proteins...
November 2005: Developmental Cell
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