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Hypoxia and diabetes

C M Han
The wound healing includes non-healing and overhealing of the wounds. The results of wound healing are well known by people such as non-healing of the diabetic ulcer or hypertrophic scar after deep burn. In this issue, three papers involve in wound healing, one about autologous adipose-derived mesenchymal stem cells injected into wound or scar of rabbit ear, one about severe hypoxia and hypoalbuminemia inducing human hypertrophic scar derived fibroblast apoptosis in vitro, and another about the dysfunction of protein kinase B/mammalian target of rapamycin signaling pathway contributing to the pathophysiological characteristics of diabetic skin and non-healing wound...
October 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
Domenico Maurizio Toraldo, Michele De Benedetto, Luana Conte, Francesco De Nuccio
Obstructive sleep apnea (OSA) is characterized by repetitive interruptions of breathing, causing a Chronic Intermittent Hypoxia (CIH) that can be a key step in the development and progression of cardiovascular diseases. Nowadays, in fact, there is scientific evidence showing the close relationship between OSA and atherosclerosis, even in those patients who do not show co-morbidities such as hypertension, diabetes, high levels of low-density lipoprotein (LDL), cigarette smoking and obesity, which normally are able to activate the endothelium...
October 7, 2016: Current Vascular Pharmacology
Jun Shao, Yong Yao
PURPOSE: The apoptosis of human umbilical vein endothelial cells has been reportedly induced by the protein transthyretin (TTR). In human ocular tissue, TTR is generally considered to be secreted mainly by retinal pigment epithelial cells (hRPECs); however, whether TTR affects the development of neovascularization in diabetic retinopathy (DR) remains unclear. METHODS: Natural and simulated DR media were used to culture human retinal microvascular endothelial cells (hRECs)...
2016: Molecular Vision
Wating Su, Yuan Zhang, Qiongxia Zhang, Jinjin Xu, Liying Zhan, Qiqi Zhu, Qingquan Lian, Huimin Liu, Zhong-Yuan Xia, Zhengyuan Xia, Shaoqing Lei
BACKGROUND: Patients with diabetes are prone to develop cardiac hypertrophy and more susceptible to myocardial ischemia-reperfusion (I/R) injury, which are concomitant with hyperglycemia-induced oxidative stress and impaired endothelial nitric oxide (NO) synthase (eNOS)/NO signaling. Caveolae are critical in the transduction of eNOS/NO signaling in cardiovascular system. Caveolin (Cav)-3, the cardiomyocytes-specific caveolae structural protein, is decreased in the diabetic heart in which production of reactive oxygen species are increased...
October 12, 2016: Cardiovascular Diabetology
Jianming Wu, Xiao Ke, Na Ma, Wei Wang, Wei Fu, Hongcheng Zhang, Manxi Zhao, Xiaoping Gao, Xiaofeng Hao, Zhirong Zhang
BACKGROUND: It has been reported that formononetin (FMN), one of the main ingredients from famous traditional Chinese medicine "Huang-qi" (Astragalus membranaceus [Fisch] Bunge) for Qi-tonifying, exhibits the effects of immunomodulation and tumor growth inhibition via antiangiogenesis. Furthermore, A. membranaceus may alleviate the retinal neovascularization (NV) of diabetic retinopathy. However, the information of FMN on retinal NV is limited so far. In the present study, we investigated the effects of FMN on the hypoxia-induced retinal NV and the possible related mechanisms...
2016: Drug Design, Development and Therapy
João Paulo M C M Cunha, Gunter Leuckx, Peter Sterkendries, Hannelie Korf, Gabriela Bomfim-Ferreira, Lutgart Overbergh, Bart Vaes, Harry Heimberg, Conny Gysemans, Chantal Mathieu
AIMS/HYPOTHESIS: Hypoxia in the initial days after islet transplantation leads to considerable loss of islet mass and contributes to disappointing outcomes in the clinical setting. The aim of the present study was to investigate whether co-transplantation of human non-endothelial bone marrow-derived multipotent adult progenitor cells (MAPCs), which are non-immunogenic and can secrete angiogenic growth factors during the initial days after implantation, could improve islet engraftment and survival...
October 4, 2016: Diabetologia
José Julio Reyes, Beatriz Villanueva, Juan Antonio López-Villodres, José Pedro De La Cruz, Lidia Romero, María Dolores Rodríguez-Pérez, Guillermo Rodríguez-Gutiérrez, Juan Fernández-Bolaños, José Antonio González-Correa
The aim of this study was to determine whether the administration of hydroxytyrosol (HT) to diabetic animals exerts a neuroprotective effect on brain damage in a model of hypoxia-reoxygenation. Rats (10 per group) were distributed in five groups: nondiabetic rats, control diabetic rats (DR), and DR rats treated for 2 months with 1, 5 or 10 mg/kg/day p.o. HT. At the end of follow-up an experimental model of hypoxia-reoxygenation in brain slices was tested. The DR group showed increased cell death, oxidative and nitrosative stress and an increase in brain inflammatory mediators...
October 4, 2016: Journal of Agricultural and Food Chemistry
Tessa D Nauta, Marloes van den Broek, Sue Gibbs, Tineke C T M van der Pouw-Kraan, Cees B Oudejans, Victor W M van Hinsbergh, Pieter Koolwijk
During prolonged hypoxic conditions, endothelial cells change their gene expression to adjust to the low oxygen environment. This process is mainly regulated by the hypoxia-inducible factors, HIF-1α and HIF-2α. Although endothelial cells do not form sprouts during prolonged hypoxic culturing, silencing of HIF-2α partially restores sprout formation. The present study identifies novel HIF-2α-target genes that may regulate endothelial sprouting during prolonged hypoxia. The gene expression profile of primary human microvascular endothelial cells (hMVECs) that were cultured at 20 % oxygen was compared to hMVECs that were cultured at 1 % oxygen for 14 days by using genome-wide RNA-sequencing...
October 3, 2016: Angiogenesis
Serafina Perrone, Maria Luisa Tataranno, Simona Negro, Mariangela Longini, Maria Stefania Toti, Maria Gabriella Alagna, Fabrizio Proietti, Francesco Bazzini, Paolo Toti, Giuseppe Buonocore
BACKGROUND: Prenatal conditions of enhanced oxidative stress (OS) linked to inflammation or hypoxia have been associated with impaired fetal growth and preterm delivery. Little is known regarding biomarkers of OS in the cord blood of preterm infants and placental histological patterns. OBJECTIVES: To test the hypothesis that placental lesions indicating chorioamnionitis (CA) or vascular underperfusion (VU) are associated with increased OS in the offspring. METHODS: 120 neonates born below 29(+6) weeks of gestational age (GA) were enrolled...
October 2016: Placenta
Jin Yu, Yiliyaer Maimaitili, Peng Xie, Jianjiang Wu, Jiang Wang, Yining Yang, Haiping Ma, Hong Zheng
AIM: Hyperglycaemia-induced cell injury is a primary cause of cardiovascular complications in diabetic patients. In vivo studies demonstrated that sevoflurane postconditioning (SpostC) was cardioprotective against ischaemia/reperfusion injury, which was blocked by hyperglycaemia. This study investigated whether high glucose concentration abrogated SpostC cardioprotection in vitro by advancing mitochondrial fission and whether mitochondrial division inhibitor-1 (Mdivi-1) restored SpostC cardioprotection in cultured primary neonatal rat cardiomyocytes (NCMs)...
September 29, 2016: Acta Physiologica
Zengyang Yu, Tianyu Zhang, Chenyuan Gong, Yuchen Sheng, Bin Lu, Lingyu Zhou, Lili Ji, Zhengtao Wang
Erianin is a natural compound found in Dendrobium chrysotoxum Lindl. Diabetic retinopathy (DR) is a serious and common microvascular complication of diabetes. This study aims to investigate the inhibitory mechanism of erianin on retinal neoangiogenesis and its contribution to the amelioration of DR. Erianin blocked high glucose (HG)-induced tube formation and migration in choroid-retinal endothelial RF/6A cells. Erianin inhibited HG-induced vascular endothelial growth factor (VEGF) expression, hypoxia-inducible factor 1-alpha (HIF-1α) translocation into nucleus and ERK1/2 activation in RF/6A and microglia BV-2 cells...
September 28, 2016: Scientific Reports
Ellie Wernham, Jason Gurney, James Stanley, Lis Ellison-Loschmann, Diana Sarfati
BACKGROUND: Internationally, a typical model of maternity care is a medically led system with varying levels of midwifery input. New Zealand has a midwife-led model of care, and there are movements in other countries to adopt such a system. There is a paucity of systemic evaluation that formally investigates safety-related outcomes in relationship to midwife-led care within an entire maternity service. The main objective of this study was to compare major adverse perinatal outcomes between midwife-led and medical-led maternity care in New Zealand...
September 2016: PLoS Medicine
Alaa Shafie, Mingzhan Xue, Guy Barker, Daniel Zehnder, Paul J Thornalley, Naila Rabbani
Glyoxalase 1 (Glo1) is a cytoplasmic enzyme with a cytoprotective function linked to metabolism of the cytotoxic side-product of glycolysis, methylglyoxal. It prevents dicarbonyl stress - the abnormal accumulation of reactive dicarbonyl metabolites increasing protein and DNA damage. Increased Glo1 expression delays ageing and suppresses carcinogenesis, insulin resistance, cardiovascular disease and vascular complications of diabetes and renal failure. Surprisingly gene trapping by the International Mouse Knockout Consortium (IMKC) to generate putative Glo1 knockout mice produced a mouse line with phenotype characterised as normal and healthy...
September 26, 2016: Biochemical Journal
Daisuke Inoue
Obstructive sleep apnea syndrome(OSAS)is a sleep disorder characterized by repetitive upper airway collapse during sleep, causing frequent hypoxia and sleep disturbance. Known risk factors of OSAS include obesity, male sex and smoking. OSAS has been linked to various comorbidities such as hypertension, cardiovascular diseases and diabetes. Recent evidence also indicates that OSAS is associated with vitamin D insufficiency, increased bone resorption and bone loss. Thus, although increased fracture rate has not been demonstrated, OSAS is now recognized as a risk factor of osteoporosis...
2016: Clinical Calcium
Peter A Campochiaro, Lloyd Paul Aiello, Philip J Rosenfeld
The association of retinal hypoxia with retinal neovascularization has been recognized for decades, causing Michaelson to postulate in 1948 that a factor secreted by hypoxic retina was involved. The isolation of vascular endothelial growth factor (VEGF), characterization of its angiogenic activity, and demonstration that its expression was increased in hypoxic tissue made it a prime candidate. Intraocular levels of VEGF are elevated in patients with retinal or iris neovascularization, and VEGF-specific antagonists markedly suppress retinal neovascularization in mice and primates with ischemic retinopathy...
October 2016: Ophthalmology
Grazia Maugeri, Agata Grazia D'Amico, Salvatore Saccone, Concetta Federico, Sebastiano Cavallaro, Velia D'Agata
Pituitary adenylate cyclase-activating polypeptide (PACAP) and vasoactive intestinal peptide (VIP) exert a protective role against retinal injuries, including diabetic macular edema (DME). The macular damage is induced by hyperglycemia, which damages vessels supplying blood to the retina and induces hypoxia. The microenvironmental changes stimulate the expression of hypoxia-inducible factors (HIFs), which promote the choroidal endothelial cell transmigration across the retinal pigmented epithelium (RPE) into neurosensory retina, where they proliferate into new vessels under stimulation of the vascular endothelial growth factor (VEGF)...
September 23, 2016: Journal of Cellular Physiology
Thing-Fong Tzeng, Wayne Young Liu, Shorong-Shii Liou, Tang-Yao Hong, I-Min Liu
Plantaginis semen, the dried ripe seed of Plantago asiatica L. or Plantago depressa Willd. (Plantaginaceae), has been traditionally used to treat blurred vision in Asia. The aim of this work was to investigate the effect of plantaginis semen ethanol extract (PSEE) on the amelioration of diabetic retinopathy (DR) in streptozotocin (STZ)-diabetic rats. PSEE has abundant polyphenols with strong antioxidant activity. PSEE (100, 200 or 300 mg/kg) was oral administrated to the diabetic rats once daily consecutively for 8 weeks...
2016: Nutrients
Michael E Hall, Michael V Rocco, Timothy M Morgan, Craig A Hamilton, Jennifer H Jordan, Matthew S Edwards, John E Hall, William G Hundley
BACKGROUND: Chronic renal hypoxia influences the progression of chronic kidney disease (CKD). Blood oxygen level-dependent (BOLD) magnetic resonance (MR) is a noninvasive tool for the assessment of renal oxygenation. The impact of beta-blockers on renal hemodynamics and oxygenation is not completely understood. We sought to determine the association between beta-blocker use, renal cortical and medullary oxygenation, and renal blood flow in patients suspected of renal artery stenosis. METHODS: We measured renal cortical and medullary oxygenation using BOLD MR and renal artery blood flow using MR phase contrast techniques in 38 participants suspected of renal artery stenosis...
August 2016: Cardiorenal Medicine
Victoria Catalán, Javier Gómez-Ambrosi, Amaia Rodríguez, Beatriz Ramírez, Víctor Valentí, Rafael Moncada, Manuel F Landecho, Camilo Silva, Javier Salvador, Gema Frühbeck
Interleukin (IL)-32 is a recently described cytokine involved in the regulation of inflammation. We aimed to explore whether IL-32 could function as an inflammatory and angiogenic factor in human obesity and obesity-associated type 2 diabetes. Samples obtained from 90 subjects were used in the study. We show, for the first time that increased circulating levels of IL-32 in obese patients decreased after weight loss achieved by Roux-en-Y gastric bypass but not following a conventional hypocaloric diet. Obese patients exhibited higher expression levels of IL-32 in visceral adipose tissue (AT) as well as in subcutaneous AT and peripheral mononuclear blood cells...
September 14, 2016: Diabetes
Anica Winges, Tarcyane Barata Garcia, Philipp Prager, Peter Wiedemann, Leon Kohen, Andreas Bringmann, Margrit Hollborn
BACKGROUND: Diabetic retinopathy is associated with osmotic stress resulting from hyperglycemia and intracellular sorbitol accumulation. Systemic hypertension is a risk factor of diabetic retinopathy. High intake of dietary salt increases extracellular osmolarity resulting in systemic hypertension. We determined the effects of extracellular hyperosmolarity, chemical hypoxia, and oxidative stress on the gene expression of enzymes involved in sorbitol production and conversion in cultured human retinal pigment epithelial (RPE) cells...
September 14, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
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