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Hypoxia Insulin

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https://www.readbyqxmd.com/read/29145927/corrigendum-to-hypoxia-limits-mouse-follicle-growth-in-vitro
#1
J M Connolly, M T Kane, L R Quinlan, P Dockery, A C Hynes
Ovarian follicle culture is useful for elucidation of factors involved in the regulation of follicular function. We examined the effects of gas phase oxygen concentration, an oil overlay, serum type and medium supplementation with FSH, insulin-transferrin-selenium (ITS) and I-ascorbic acid on cultured preantral mouse follicle growth in a spherical, non-attached follicle culture system. Follicle growth in 5% oxygen was significantly (P<0.01) inferior to growth in 20% oxygen in terms of follicle diameter. This was likely due to hypoxia, as evidenced by significantly (P<0...
February 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/29145148/honokiol-protects-pancreatic-%C3%AE-cell-against-high-glucose-and-intermittent-hypoxia-induced-injury-by-activating-nrf2-are-pathway-in-vitro-and-in-vivo
#2
Chen-Guang Li, Chang-Lin Ni, Min Yang, Yun-Zhao Tang, Zhu Li, Yan-Juan Zhu, Zhen-Huan Jiang, Bei Sun, Chun-Jun Li
Obstructive sleep apnea hypopnea syndrome (OSAHS) is associated with glucose intolerance, insulin resistance and type 2 diabetes mellitus (T2DM). Although several studies have revealed that intermittent hypoxia (IH) in OSAHS may further aggravate pancreatic β cell damage and promote the evolution of type 2 diabetes (T2DM) by increasing oxidative stress, the underlying mechanisms are unclear. Honokiol, a potent radical scavenger, has been demonstrated to ameliorate oxidative stress in many cases. The present study aimed to explore the potential mechanism of IH and diabetes synergistically damage and destruct the pancreatic β cell, examine the effects of honokiol on ameliorating pancreatic β cell injury in this context and explore the mechanism of such effects...
November 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29131417/culturing-with-modified-egm2-medium-enhances-porcine-neonatal-islet-like-cell-clusters-resistance-to-apoptosis-in-islet-xenotransplantation
#3
Xiaoqian Ma, Cejun Yang, Juan Zhang, Jia Wang, Wei Li, Chang Xu, Pengfei Rong, Bin Ye, Minghua Wu, Jianhui Jiang, Shounan Yi, Wei Wang
BACKGROUND: Neonatal pig islet-like cell clusters (NICC) are an attractive source of insulin-producing tissue for potential transplantation treatment of type 1 diabetic patients. However, a considerable loss of NICC after their transplantation due to apoptosis resulted from islet isolation and instant blood-mediated inflammatory reaction remains to be overcome. METHODS: EGM2 medium depleted with hydrocortisone and supplemented with 50 mmol/L isobutylmethylxanthine, 10 mmol/L nicotinamide, and 10 mmol/L glucose was used to culture NICC at day 1, the day after isolation and changed every other day...
November 12, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/29131241/insulin-like-growth-factor-i-reduces-the-occurrence-of-necrotizing-enterocolitis-by-reducing-inflammatory-response-and-protecting-intestinal-mucosal-barrier-in-neonatal-rats-model
#4
F Tian, G-R Liu, N Li, G Yuan
OBJECTIVE: To observe the effect of enteral supplement of insulin-like growth factor I (IGF-1) on dynamic changes of TLR4, NF-κB, IL-6, SIgA and MUC2 in intestinal tissues of neonatal rats, and to investigate the protective effects and possible mechanisms of IGF-1 on necrotizing enterocolitis (NEC). MATERIALS AND METHODS: Specific pathogen free (SPF) neonatal Sprague Dawley (SD) rats aged 3 days old were randomly divided into 3 groups, namely, normal control group, NEC model group and IGF-1 intervention group...
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29128891/prmt1-promotes-hyperglycemia-in-a-foxo1-dependent-manner-affecting-glucose-metabolism-during-hypobaric-hypoxia-exposure-in-rat-model
#5
Susovon Bayen, Supriya Saini, Priya Gaur, Arul Joseph Duraisamy, Alpesh Kumar Sharma, Karan Pal, Praveen Vats, Shashi Bala Singh
PURPOSE: High-altitude (HA) environment causes changes in cellular metabolism among unacclimatized humans. Previous studies have revealed that insulin-dependent activation of protein kinase B (Akt) regulates metabolic processes via discrete transcriptional effectors. Moreover, protein arginine methyltransferase (PRMT)1-dependent arginine modification of forkhead box other (FoxO)1 protein interferes with Akt-dependent phosphorylation. The present study was undertaken to test the involvement of PRMT1 on FoxO1 activation during hypobaric hypoxia (HH) exposure in rat model...
November 11, 2017: Endocrine
https://www.readbyqxmd.com/read/29122628/a-novel-curcumin-derivative-for-the-treatment-of-diabetic-neuropathy
#6
Daniel J Daugherty, Alexandra Marquez, Nigel A Calcutt, David Schubert
Neuropathy is a common complication of long-term diabetes. Proposed mechanisms of neuronal damage caused by diabetes that are downstream of hyperglycemia and/or loss of insulin signaling include ischemic hypoxia, inflammation and loss of neurotrophic support. The curcumin derivative J147 is a potent neurogenic and neuroprotective drug candidate initially developed for the treatment of neurodegenerative conditions associated with aging that impacts many pathways implicated in the pathogenesis of diabetic neuropathy...
November 6, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29109913/comparative-analysis-of-the-microrna-transcriptome-between-yak-and-cattle-provides-insight-into-high-altitude-adaptation
#7
Jiuqiang Guan, Keren Long, Jideng Ma, Jinwei Zhang, Dafang He, Long Jin, Qianzi Tang, Anan Jiang, Xun Wang, Yaodong Hu, Shilin Tian, Zhi Jiang, Mingzhou Li, Xiaolin Luo
Extensive and in-depth investigations of high-altitude adaptation have been carried out at the level of morphology, anatomy, physiology and genomics, but few investigations focused on the roles of microRNA (miRNA) in high-altitude adaptation. We examined the differences in the miRNA transcriptomes of two representative hypoxia-sensitive tissues (heart and lung) between yak and cattle, two closely related species that live in high and low altitudes, respectively. In this study, we identified a total of 808 mature miRNAs, which corresponded to 715 pre-miRNAs in the two species...
2017: PeerJ
https://www.readbyqxmd.com/read/29055392/sleep-apnea-an-overlooked-cause-of-lipotoxicity
#8
Chenjuan Gu, Haris Younas, Jonathan C Jun
Obstructive sleep apnea (OSA) is a common sleep disorder associated with diabetes and cardiovascular disease. However, the mechanisms by which OSA causes cardiometabolic dysfunction are not fully elucidated. OSA increases plasma free fatty acids (FFA) during sleep, reflecting excessive adipose tissue lipolysis. In animal studies, intermittent hypoxia simulating OSA also increases FFA, and the increase is attenuated by beta-adrenergic blockade. In other contexts, excessive plasma FFA can lead to ectopic fat accumulation, insulin resistance, vascular dysfunction, and dyslipidemia...
October 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/29052864/short-term-hypoxia-upregulated-mas-receptor-expression-to-repress-the-at1-r-signaling-pathway-and-attenuate-ang-ii-induced-cardiomyocyte-apoptosis
#9
Ruey-Lin Chang, Chih-Fen Chang, Da-Tong Ju, Tsung-Jung Ho, Tung-Ti Chang, Jing-Wei Lin, Jia-Chun Le, Shiu-Min Cheng, Cecilia-Hsuan Day, V Vijaya Padma, Chih-Yang Huang
Hypertension-stimulated cardiac hypertrophy and apoptosis play critical roles in the progression of heart failure. Our previous study suggested that hypertensive angiotensin II (Ang II) enhanced insulin-like growth factor receptor II (IGF-IIR) expression and cardiomyocyte apoptosis, which are involved JNK activation, sirtuin1 (SIRT1) degradation, and heat-shock transcription factor 1 (HSF1) acetylation. Moreover, previous studies have implied that short-term hypoxia (STH) might exert cardioprotective effects...
October 20, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29037858/co-localization-of-insulin-like-growth-factor-binding-protein-1-casein-kinase-2%C3%AE-and-mechanistic-target-of-rapamycin-in-human-hepatocellular-carcinoma-cells-as-demonstrated-by-dual-immunofluorescence-and-in-situ-proximity-ligation-assay
#10
Sahil S Singal, Karen Nygard, Manthan R Dhruv, Kyle Biggar, Majida Abu Shehab, Shawn Shun-Cheng Li, Thomas Jansson, Madhulika B Gupta
Insulin-like growth factor binding protein (IGFBP)-1 influences fetal growth by modifying insulin-like growth factor-1 bioavailability. IGFBP-1 phosphorylation is regulated by mechanistic target of rapamycin (mTOR) and casein kinase (CSNK)-2. However, the underlying molecular mechanisms remain unknown. We examined the cellular localization and potential interactions of IGFBP-1, CSNK-2β, and mTOR as a prerequisite for protein-protein interaction. Analysis of dual immunofluorescence images indicated a potential perinuclear co-localization between IGFBP-1 and CSNK-2β and a nuclear co-localization between CSNK-2β and mTOR...
October 14, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29018059/involvement-of-leptin-in-the-molecular-physiology-of-the-placenta
#11
Malena Schanton, Julieta Lorena Maymó, Antonio Pérez-Pérez, Victor Sanchez-Margalet, Cecilia Varone
Leptin is a homeostatic regulator in the placenta where it promotes proliferation, protein synthesis and the expression of tolerogenic maternal response molecules such as HLA-G. Leptin also exerts an anti-apoptotic action in placenta controlling the expression of p53 master cell cycle regulator under different stress conditions. On the other hand, leptin is an integrative target of different placental stimuli. The expression of leptin in placenta is regulated by hCG, insulin, steroids, hypoxia, and many other growth hormones, suggesting that it might have an important endocrine function in the trophoblastic cells...
October 9, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28991527/mangiferin-ameliorates-insulin-resistance-by-inhibiting-inflammation-and-regulatiing-adipokine-expression-in-adipocytes-under-hypoxic-condition
#12
Chao-Qiang Yang, Jing-Hua Xu, Dan-Dan Yan, Bao-Lin Liu, Kang Liu, Fang Huang
Adipose tissue hypoxia has been recognized as the initiation of insulin resistance syndromes. The aim of the present study was to investigate the effects of mangiferin on the insulin signaling pathway and explore whether mangiferin could ameliorate insulin resistance caused by hypoxia in adipose tissue. Differentiated 3T3-L1 adipocytes were incubated under normal and hypoxic conditions, respectively. Protein expressions were analyzed by Western blotting. Inflammatory cytokines and HIF-1-dependent genes were tested by ELISA and q-PCR, respectively...
September 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28989568/expression-of-matrix-metalloproteinase-11-is-increased-under-conditions-of-insulin-resistance
#13
Biagio Arcidiacono, Eusebio Chiefari, Anna Elisa Laria, Sebastiano Messineo, Francesco Luciano Bilotta, Domenico Britti, Daniela Patrizia Foti, Anna Foryst-Ludwig, Ulrich Kintscher, Antonio Brunetti
AIM: To investigate matrix metalloproteinase-11 (MMP-11) expression in adipose tissue dysfunction, using in vitro and in vivo models of insulin resistance. METHODS: Culture of mouse 3T3-L1 preadipocytes were induced to differentiation into mature 3T3-L1 adipocytes. Cellular insulin resistance was induced by treating differentiated cultured adipocytes with hypoxia and/or tumor necrosis factor (TNF)-α, and transcriptional changes were analyzed in each condition thereafter...
September 15, 2017: World Journal of Diabetes
https://www.readbyqxmd.com/read/28988484/flaxseed-oil-alleviates-chronic-hfd-induced-insulin-resistance-through-remodeling-lipid-homeostasis-in-obese-adipose-tissue
#14
Xiao Yu, Yuhan Tang, Peiyi Liu, Lin Xiao, Liegang Liu, Ruiling Shen, Qianchun Deng, Ping Yao
Emerging evidence suggests that higher circulating long-chain n-3 polyunsaturated fatty acids (n-3PUFA) levels were intimately associated with lower prevalence of obesity and insulin resistance. However, the understanding of bioactivity and potential mechanism of α-linolenic acid-rich flaxseed oil (ALA-FO) against insulin resistance was still limited. This study evaluated the effect of FO on high-fat diet (HFD)-induced insulin resistance in C57BL/6J mice focused on adipose tissue lipolysis. Mice after HFD feeding for 16 weeks (60% fat-derived calories) exhibited systemic insulin resistance, which was greatly attenuated by medium dose of FO (M-FO), paralleling with differential accumulation of ALA and its n-3 derivatives across serum lipid fractions...
October 25, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28978999/low-dose-yc-1-combined-with-glucose-and-insulin-selectively-induces-apoptosis-in-hypoxic-gastric-carcinoma-cells-by-inhibiting-anaerobic-glycolysis
#15
Kota Wakiyama, Yoshihiko Kitajima, Tomokazu Tanaka, Masao Kaneki, Kazuyoshi Yanagihara, Shinichi Aishima, Jun Nakamura, Hirokazu Noshiro
This study aimed to establish a therapeutic strategy targeting hypoxic cancer cells in gastric carcinoma (GC). YC-1 is a HIF-1α inhibitor, and we revealed that low-dose YC-1 (10 µM) suppressed HIF-1α expression, and induced hypoxia-dependent apoptosis in the GC cell line 58As9. This hypoxia-specific apoptosis induction by YC-1 involved excessive reactive oxygen species (ROS) generation. The apoptotic effect of 10 µM YC-1 was enhanced by additional glucose (G) and insulin (I) treatments. RT-PCR demonstrated that 10 µM YC-1 reduced hypoxia-induced expression of HIF-1α targets involved in anaerobic glycolysis...
October 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28967470/involvement-of-synovial-matrix-degradation-and-angiogenesis-in-oxidative-stress-exposed-degenerative-rotator-cuff-tears-with-osteoarthritis
#16
Kyu-Cheol Noh, Sin-Hye Park, Cheol Jung Yang, Geun Woo Lee, Min Ki Kim, Young-Hee Kang
BACKGROUND: Shoulder osteoarthritis is a gradual wearing of the articular cartilage concomitant with degenerative rotator cuff tears (RCTs). This pathologic disorder is related to inflammation, oxidative stress, and angiogenesis. Degenerative alterations may prompt production of cytokines and angiogenesis-related proteins, evoking rotator cuff diseases. This study tested the hypothesis that oxidative stress-responsive mediators can influence joint inflammation of patients with RCT. METHODS: Twelve healthy RCT patients not suffering shoulder osteoarthritis were categorized as the control group, and 24 patients were allocated to 2 RCT groups (RCTP1 and RCTP2), according to severity of RCT and glenohumeral arthritis...
September 26, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28961383/caloric-restriction-stabilizes-body-weight-and-accelerates-behavioral-recovery-in-aged-rats-after-focal-ischemia
#17
Ovidiu Ciobanu, Raluca Elena Sandu, Adrian Tudor Balseanu, Alexandra Zavaleanu, Andrei Gresita, Eugen Bogdan Petcu, Adriana Uzoni, Aurel Popa-Wagner
Obesity and hyperinsulinemia are risk factors for stroke. We tested the hypothesis that caloric restriction, which reduces the incidence of age-related obesity and metabolic syndrome, may represent an efficient and cost-effective strategy for preventing stroke and its devastating consequences. To this end, we placed aged, obese Sprague-Dawley aged rats on a calorie-restricted diet for 8 weeks prior to the experimental infarction. Stroke in this animal model caused a progressive decrease in weight that reached a minimum at day 6 for the young rats, and at day 10 for the aged, ad libitum-fed rats...
December 2017: Aging Cell
https://www.readbyqxmd.com/read/28955777/up-regulation-of-selenoprotein-p-and-hip-pap-mrnas-in-hepatocytes-by-intermittent-hypoxia-via-down-regulation-of-mir-203
#18
Tomoko Uchiyama, Hiroyo Ota, Asako Itaya-Hironaka, Ryogo Shobatake, Akiyo Yamauchi, Sumiyo Sakuramoto-Tsuchida, Mai Makino, Hiroshi Kimura, Maiko Takeda, Chiho Ohbayashi, Shin Takasawa
Sleep apnea syndrome is characterized by recurrent episodes of oxygen desaturation and reoxygenation (intermittent hypoxia [IH]) and is a risk factor for insulin resistance/type 2 diabetes. However, the mechanisms linking IH stress and insulin resistance remain elusive. We exposed human hepatocytes (JHH5, JHH7, and HepG2) to experimental IH or normoxia for 24 h, measured mRNA levels by real-time reverse transcription polymerase chain reaction (RT-PCR), and found that IH significantly increased the mRNA levels of selenoprotein P (SELENOP) - a hepatokine - and hepatocarcinoma-intestine-pancreas/pancreatitis-associated protein (HIP/PAP) - one of REG (Regenerating gene) family...
September 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28952514/an-approach-to-in-vitro-manufacturing-of-hypertrophic-cartilage-matrix-for-bone-repair
#19
Bach Quang Le, Clemens Van Blitterswijk, Jan De Boer
Devitalized hypertrophic cartilage matrix (DCM) is an attractive concept for an off-the-shelf bone graft substitute. Upon implantation, DCM can trigger the natural endochondral ossification process, but only when the hypertrophic cartilage matrix has been reconstituted correctly. In vivo hypertrophic differentiation has been reported for multiple cell types but up-scaling and in vivo devitalization remain a big challenge. To this end, we developed a micro tissue-engineered cartilage (MiTEC) model using the chondrogenic cell line ATDC5...
April 20, 2017: Bioengineering
https://www.readbyqxmd.com/read/28950392/systemic-hypoxia-increases-the-expression-of-dpp4-in-preadipocytes-of-healthy-human-participants
#20
Helena H Chowdhury, Jelena Velebit, Igor B Mekjavic, Ola Eiken, Marko Kreft, Robert Zorec
Dipeptidyl peptidase 4 (DPP4) is a transmembrane glycoprotein involved in protein degradation. Due to its action on incretins, which increase insulin secretion, DPP4 is considered a therapeutic target for type 2 diabetes. Here we have studied the role of single and combined effects of hypoxia and inactivity on the expression of DPP4 in human adipose tissue of 12 adult normal-weight males. Fat biopsies were obtained at baseline and after each of three experimental campaigns. The results revealed that in isolated human preadipocytes the expression of DPP4 was significantly increased by exposure of participants to hypoxia...
September 26, 2017: Experimental and Clinical Endocrinology & Diabetes
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