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https://www.readbyqxmd.com/read/28931617/normobaric-hyperoxia-reduces-blood-occludin-fragments-in-rats-and-patients-with-acute-ischemic-stroke
#1
Shuhai Shi, Zhifeng Qi, Qingfeng Ma, Rong Pan, Graham S Timmins, Yongmei Zhao, Wenjuan Shi, Yunzhou Zhang, Xunming Ji, Ke Jian Liu
BACKGROUND AND PURPOSE: Damage of the blood-brain barrier (BBB) increases the incidence of neurovascular complications, especially for cerebral hemorrhage after tPA (tissue-type plasminogen activator) therapy. Currently, there is no effective method to evaluate the extent of BBB damage to guide tPA use. Herein, we investigated whether blood levels of tight junction proteins could serve as biomarker of BBB damages in acute ischemic stroke (AIS) in both rats and patients. We examined whether this biomarker could reflect the extent of BBB permeability during cerebral ischemia/reperfusion and the effects of normobaric hyperoxia (NBO) on BBB damage...
September 20, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28931589/oral-supplementation-of-glutamine-attenuates-the-progression-of-nonalcoholic-steatohepatitis-in-c57bl-6j-mice
#2
Cathrin Sellmann, Anja Baumann, Annette Brandt, Cheng Jun Jin, Anika Nier, Ina Bergheim
Background: Universally accepted therapeutic strategies for the treatment of nonalcoholic steatohepatitis (NASH) are still lacking. Studies suggest a preventive effect of oral Gln supplementation on the development of NASH; however, whether Gln also has therapeutic potential for pre-existing NASH has not yet been clarified.Objective: The aim of the present study was to determine whether Gln prevents the progression of diet-induced NASH in mice.Methods: For 8 wk, female C57BL/6J mice (6-8 wk old) were pair-fed a liquid Western-style diet [WSD, 25% of energy from fat, 50% wt:wt fructose, 0...
September 20, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28930913/the-effect-of-lactoferrin-and-pepsin-treated-lactoferrin-on-iec-6-cell-damage-induced-by-clostridium-difficile-toxin-b
#3
Kosuke Otake, Norio Sato, Ayako Kitaguchi, Takayuki Irahara, Satoru Murata, Keiichiro Shiraga, Yuichi Ogawa, Takahiro K Fujiwara, Kaoru Koike, Hiroyuki Yokota
Clostridium difficile infections (CDI) have recently increased worldwide. Some CDI progress to fulminant and recurrent CDI and are associated with high mortality and morbidity. CD produces toxins A and B, which cause intestinal mucosal damage, although toxin B exhibits greater cytotoxicity. Pepsin-treated lactoferrin (PLF) is the decomposed product of lactoferrin (LF), a multifunctional glycoprotein with anti-inflammatory properties. Here, we investigate the effects of LF and PLF in toxin B-stimulated rat intestinal epithelial (IEC-6) cells...
September 19, 2017: Shock
https://www.readbyqxmd.com/read/28928959/cell-polarity-cell-adhesion-and-spermatogenesis-role-of-cytoskeletons
#4
REVIEW
Linxi Li, Ying Gao, Haiqi Chen, Tito Jesus, Elizabeth Tang, Nan Li, Qingquan Lian, Ren-Shan Ge, C Yan Cheng
In the rat testis, studies have shown that cell polarity, in particular spermatid polarity, to support spermatogenesis is conferred by the coordinated efforts of the Par-, Crumbs-, and Scribble-based polarity complexes in the seminiferous epithelium. Furthermore, planar cell polarity (PCP) is conferred by PCP proteins such as Van Gogh-like 2 (Vangl2) in the testis. On the other hand, cell junctions at the Sertoli cell-spermatid (steps 8-19) interface are exclusively supported by adhesion protein complexes (for example, α6β1-integrin-laminin-α3,β3,γ3 and nectin-3-afadin) at the actin-rich apical ectoplasmic specialization (ES) since the apical ES is the only anchoring device in step 8-19 spermatids...
2017: F1000Research
https://www.readbyqxmd.com/read/28928541/morphological-and-functional-analyses-of-the-tight-junction-in-the-palatal-epithelium-of-mouse
#5
Noriko Shiotsu, Tadafumi Kawamoto, Mariko Kawai, Mika Ikegame, Yasuhiro Torii, Hiroyuki Sasaki, Toshio Yamamoto
Tight junction (TJ) is one of the cell-cell junctions and known to have the barrier and fence functions between adjacent cells in both simple and stratified epithelia. We examined the distribution pattern, constitutive proteins, and permeability of TJ in the stratified squamous epithelium of the palatal mucosa of mice. Ultrastructural observations based on the ultrathin section and freeze-fracture methods revealed that poorly developed TJs are located at the upper layer of the stratum granulosum. The positive immunofluorescence of occludin (OCD), claudin (CLD)-1 and -4 were localized among the upper layer of the stratum granulosum showing a dot-like distribution pattern...
August 25, 2017: Acta Histochemica et Cytochemica
https://www.readbyqxmd.com/read/28925083/selective-knockout-of-astrocytic-na-h-exchanger-isoform-1-reduces-astrogliosis-bbb-damage-infarction-and-improves-neurological-function-after-ischemic-stroke
#6
Gulnaz Begum, Shanshan Song, Shaoxia Wang, Hanshu Zhao, Mohammad Iqbal H Bhuiyan, Eric Li, Rachel Nepomuceno, Qing Ye, Ming Sun, Michael Joseph Calderon, Donna B Stolz, Claudette St Croix, Simon C Watkins, Yinhuai Chen, Pingnian He, Gary E Shull, Dandan Sun
Stimulation of Na(+) /H(+) exchanger isoform 1 (NHE1) in astrocytes causes ionic dysregulation under ischemic conditions. In this study, we created a Nhe1(flox/flox) (Nhe1(f/f) ) mouse line with exon 5 of Nhe1 flanked with two loxP sites and selective ablation of Nhe1 in astrocytes was achieved by crossing Nhe1(f/f) mice with Gfap-Cre(ERT2) Cre-recombinase mice. Gfap-Cre(ERT2+/-) ;Nhe1(f/f) mice at postnatal day 60-90 were treated with either corn oil or tamoxifen (Tam, 75 mg/kg/day, i.p.) for 5 days. After 30 days post-injection, mice underwent transient middle cerebral artery occlusion (tMCAO) to induce ischemic stroke...
September 19, 2017: Glia
https://www.readbyqxmd.com/read/28921512/dacomitinib-induced-diarrhea-targeting-chloride-secretion-with-crofelemer
#7
Ysabella Z A Van Sebille, Rachel J Gibson, Hannah R Wardill, Imogen A Ball, Dorothy M K Keefe, Joanne M Bowen
Dacomitinib, an irreversible small-molecule pan-ErbB TKI, has a high incidence of diarrhea which has been suggested to be due to chloride secretory mechanisms. Based on this hypothesis, crofelemer, an anti-secretory agent may be an effective intervention. T84 monolayers were treated with 1µM dacomitinib and 10µM crofelemer, and mounted into Ussing chambers for electrogenic ion analysis. Crofelemer attenuated increases in chloride secretion in cells treated with dacomitinib. Albino Wistar rats (n=48) were treated with 7...
September 16, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28920862/enhanced-endothelium-epithelial-sodium-channel-signaling-prompts-left-ventricular-diastolic-dysfunction-in-obese-female-mice
#8
Guanghong Jia, Javad Habibi, Annayya R Aroor, Michael A Hill, Vincent G DeMarco, Li E Lee, Lixin Ma, Brady J Barron, Adam Whaley-Connell, James R Sowers
OBJECTIVE: Enhanced activation of cell specific mineralocorticoid receptors (MRs) in obesity plays a key role in the development of cardiovascular disease including cardiac diastolic dysfunction as a critical prognosticator. Our previous investigations demonstrated that selective endothelium MR activation promotes a maladaptive inflammatory response and fibrosis in cardiovascular tissue in female mice fed a western diet (WD), and this was associated with expression and activation of the epithelial sodium channel on the surface of endothelial cells (EnNaC)...
September 8, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28915390/navy-and-black-bean-supplementation-primes-the-colonic-mucosal-microenvironment-to-improve-gut-health
#9
Jennifer M Monk, Dion Lepp, Wenqing Wu, K Peter Pauls, Lindsay E Robinson, Krista A Power
Common beans (Phaseolus vulgaris L.) are enriched in non-digestible fermentable carbohydrates and phenolic compounds that can modulate the colonic microenvironment (microbiota and host epithelial barrier) to improve gut health. In a comprehensive assessment of the impact of two commonly consumed bean varieties (differing in levels and types of phenolic compounds) within the colonic microenvironment, C57Bl/6 mice were fed diets supplemented with 20% cooked navy bean (NB) or black bean (BB) flours or an isocaloric basal diet control (BD) for 3 weeks...
August 10, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28912935/baicalin-attenuates-subarachnoid-hemorrhagic-brain-injury-by-modulating-blood-brain-barrier-disruption-inflammation-and-oxidative-damage-in-mice
#10
Xianqing Shi, Yongjian Fu, SongSong Zhang, Hao Ding, Jin Chen
In subarachnoid hemorrhagic brain injury, the early crucial events are edema formation due to inflammatory responses and blood-brain barrier disruption. Baicalin, a flavone glycoside, has antineuroinflammatory and antioxidant properties. We examined the effect of baicalin in subarachnoid hemorrhagic brain injury. Subarachnoid hemorrhage was induced through filament perforation and either baicalin or vehicle was administered 30 min prior to surgery. Brain tissues were collected 24 hours after surgery after evaluation of neurological scores...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28906444/short-term-intake-of-a-fructose-fat-and-cholesterol-rich-diet-causes-hepatic-steatosis-in-mice-effect-of-antibiotic-treatment
#11
Annette Brandt, Cheng Jun Jin, Katja Nolte, Cathrin Sellmann, Anna Janina Engstler, Ina Bergheim
Intestinal microbiota and barrier functions seem to play an important role in the development of non-alcoholic fatty liver disease (NAFLD). However, whether these changes are an early event in the development of NAFLD or are primarily associated with later stages of the disease, has not yet been clarified. Using a pair-feeding model, we determined the effects of a short-term intake of a fat-, fructose- and cholesterol-rich diet (FFC) on the development of early hepatic steatosis and markers of intestinal barrier function in mice treated with and without non-resorbable antibiotics (AB)...
September 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28905096/comparison-of-suction-blistering-and-tape-stripping-for-analysis-of-epidermal-genes-proteins-and-lipids
#12
Marek Svoboda, Marta Hlobilová, Markéta Marešová, Michaela Sochorová, Andrej Kováčik, Kateřina Vávrová, Iva Dolečková
Analysis of epidermal genes, proteins and lipids is important in the research and diagnosis of skin diseases. Although punch biopsy is the first-choice technique for the skin sampling, it is unnecessarily invasive for obtaining a sample just for the epidermal analysis. Here we compare two less invasive methods, suction blistering (SB) and tape stripping (TS), for the analysis of selected epidermal genes (quantitative real-time reverse transcription PCR, qRT-PCR), proteins (western blotting, WB), and lipids in ten healthy volunteers...
September 13, 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28901890/dietary-l-arginine-inhibits-intestinal-clostridium-perfringens-colonisation-and-attenuates-intestinal-mucosal-injury-in-broiler-chickens
#13
Beibei Zhang, Zengpeng Lv, Huixian Li, Shuangshuang Guo, Dan Liu, Yuming Guo
We investigated the effects of dietary l-arginine level and feeding duration on the intestinal damage of broilers induced by Clostridium perfringens (CP) in vivo, and the antimicrobial effect of its metabolite nitric oxide (NO) in vitro. The in vivo experiment was designed as a factorial arrangement of three dietary treatments×two challenge statuses. Broilers were fed a basal diet (CON) or a high-arginine diet (ARG) containing 1·87 % l-arginine, or CON for the first 8 d and ARG from days 9 to 28 (CON/ARG)...
September 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28901429/monocytic-cell-junction-proteins-serve-important-roles-in-atherosclerosis-via-the-endoglin-pathway
#14
Lina Chen, Zhongliang Chen, Menghua Ge, Oushan Tang, Yinhong Cheng, Haoliang Zhou, Yu Shen, Fengming Qin
The formation of atherosclerosis is recognized to be caused by multiple factors including pathogenesis in monocytes during inflammation. The current study provided evidence that monocytic junctions were significantly altered in patients with atherosclerosis, which suggested an association between cell junctions and atherosclerosis. Claudin‑1, occludin‑1 and ZO‑1 were significantly enhanced in atherosclerosis, indicating that the tight junction pathway was activated during the pathogenesis of atherosclerosis...
September 8, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28889842/effects-of-acupuncture-on-1-chloro-2-4-dinitrochlorobenzene-induced-allergic-contact-dermatitis-in-mice
#15
Cuicui Chen, Xiaozhu Liu, Yinfeng Li, Huankun Liang, Kangyan Li, Jiali Li, Chengwu Cheng, Xianpan Liu, Shuhai Zhong, Laiqing Li, Yan Wang
Allergic contact dermatitis (ACD) is a chronic inflammatory skin disease. Topical corticosteroids are the first-line therapy for ACD despite their significant adverse effects. Acupuncture has been widely used in the treatment of various skin diseases, but its underlying mechanism remains unrevealed. In this study, we investigated the characteristics of acupuncture treatment based on effectiveness and mechanism. BALB/c mice received 1-chloro-2,4-dinitrobenzene (DNCB) application to build AD-like model. Results showed that acupuncture was an effective treatment method in inhibiting inflammatory conditions, serum IgE levels, and expression of proinflammatory cytokine Th2 (IL-4, IL-6), and Th2 (IL-1β, TNF-α) mRNA compared with DNCB treatment...
August 2017: Journal of Acupuncture and Meridian Studies
https://www.readbyqxmd.com/read/28888784/malignant-ascites-determine-the-transmesothelial-invasion-of-ovarian-cancer-cells
#16
Justyna Mikuła-Pietrasik, Paweł Uruski, Sebastian Szubert, Dariusz Szpurek, Stefan Sajdak, Andrzej Tykarski, Krzysztof Książek
The exact role of malignant ascites in the development of intraperitoneal ovarian cancer metastases remains unclear. In this report we sought to establish if ascites can determine the efficiency of transmesothelial invasion of ovarian cancer cells, and, if so, whether the fluid generated by highly aggressive serous and undifferentiated tumors will promote the invasion more effectively than ascites from less aggressive clear cell and endometrioid cancers. The study showed that the invasion of ovarian cancer cells (SKOV-3 and primary cancer cells) across monolayered peritoneal mesothelial cells was elevated upon mesothelial cell exposure to fluid produced by serous and undifferentiated cancers, as compared with cells subjected to ascites from clear cell and endometrioid tumors...
September 6, 2017: International Journal of Biochemistry & Cell Biology
https://www.readbyqxmd.com/read/28887194/hypoxia-inducible-factor-1%C3%AE-is-involved-in-isoflurane-induced-blood-brain-barrier-disruption-in-aged-rats-model-of-pocd
#17
Yiyun Cao, Zhengqian Li, Hongping Li, Cheng Ni, Lunxu Li, Ning Yang, Chengmei Shi, Yanfeng Zhong, Dehua Cui, Xiangyang Guo
Prolonged exposure to inhaled anesthetics may lead to postoperative cognitive dysfunction (POCD). Nevertheless, the underlying mechanisms are not known. Hypoxia-inducible factor-1α (HIF-1α) and its target gene vascular endothelial growth factor (VEGF) were shown to be activated by inhaled anesthetics. The aim of the present study was to determine the role of HIF-1α in isoflurane-induced blood-brain barrier (BBB) disruption and resultant cognitive impairment. After a 4-h exposure to 1.5% isoflurane in 20-month-old rats, increases in vascular permeability, and disrupted BBB ultrastructure were accompanied by the degradation of tight junction proteins occludin and collagen type IV in brain blood vessels...
September 5, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28883692/fluctuation-of-zonulin-levels-in-blood-vs-stability-of-antibodies
#18
Aristo Vojdani, Elroy Vojdani, Datis Kharrazian
AIM: To evaluate the measurement of zonulin level and antibodies of zonulin and other tight junction proteins in the blood of controls and celiac disease patients. METHODS: This study was conducted to assess the variability or stability of zonulin levels vs IgA and IgG antibodies against zonulin in blood samples from 18 controls at 0, 6, 24 and 30 h after blood draw. We also measured zonulin level as well as zonulin, occludin, vinculin, aquaporin 4 and glial fibrillary acidic protein antibodies in the sera of 30 patients with celiac disease and 30 controls using enzyme-linked immunosorbent assay methodology...
August 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28883042/real-time-acquisition-of-transendothelial-electrical-resistance-in-an-all-human-in-vitro-3-dimensional-blood-brain-barrier-model-exemplifies-tight-junction-integrity
#19
Zaynah Maherally, Helen L Fillmore, Sim Ling Tan, Suk Fei Tan, Samah A Jassam, Friederike I Quack, Kathryn E Hatherell, Geoffrey J Pilkington
The blood-brain barrier (BBB) consists of endothelial cells, astrocytes, and pericytes embedded in basal lamina (BL). Most in vitro models use nonhuman, monolayer cultures for therapeutic-delivery studies, relying on transendothelial electrical resistance (TEER) measurements without other tight-junction (TJ) formation parameters. We aimed to develop reliable, reproducible, in vitro 3-dimensional (3D) models incorporating relevant human, in vivo cell types and BL proteins. The 3D BBB models were constructed with human brain endothelial cells, human astrocytes, and human brain pericytes in mono-, co-, and tricultures...
September 7, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28882647/acute-and-chronic-exposure-to-high-levels-of-glucose-modulates-tight-junction-associated-epithelial-barrier-function-in-a-renal-tubular-cell-line
#20
B M Mongelli-Sabino, L P Canuto, C B Collares-Buzato
AIMS: Type 2 diabetes mellitus (T2DM) is one of the most prevalent diseases worldwide. Diabetic nephropathy (DN) is a complication of diabetes and the mechanisms underlying onset and progression of this disease are not fully understood. It has been shown that hyperglycemia is an independent factor to predict the development of DN in individuals with T2DM, however, a link between high plasma glucose levels and renal tubular injuries in DN remains unknown. In this study, we investigated the effect of high levels of glucose (i...
September 4, 2017: Life Sciences
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