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Cheng Y, Liu Y, Chen D, Zhou Y, Yu S, Lin H, Liao CK, Lin H, Xu P, Huang M. Dual effects of quercetin on protein digestion and absorption in the digestive tract. Food Chem 2021; 358:129891. [PMID: 33940290 DOI: 10.1016/j.foodchem.2021.129891] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 01/02/2023]
Abstract
Quercetin is a well-studied natural product with multiple pharmacological properties. In this study, we demonstrated that quercetin suppressed protein digestion in the intestinal fluid by inhibiting trypsin, a key digestive enzyme. However, we also observed a previously unknown property of quercetin: promoting the intestinal absorption of proteins. In addition, the promoted protein absorption was mediated by internalization of digested oligopeptides in the intestinal epithelia rather than increasing the intestinal paracellular permeability. Notably, four other flavonoids also achieved such enhanced intestinal absorption, suggesting that this effect was associated with the aglycone flavonol backbone, but not related to their inhibitory potencies against trypsin. This study demonstrates that quercetin exhibits dual effects on protein digestion and absorption: 1) suppressing protein digestion by inhibiting trypsin in the intestinal fluid; 2) promoting the intestinal absorption of oligopeptides in the intestinal villi cells.
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Affiliation(s)
- Yuan Cheng
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | - Yurong Liu
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | - Dan Chen
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | - Yang Zhou
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | - Shujuan Yu
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | - Huajian Lin
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China
| | | | - Haili Lin
- Department of Pharmacy, The Peoples Hospital of Fujian Province, Fuzhou, China
| | - Peng Xu
- College of Biological Science and Engineering, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China; Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou University, Fuzhou, China.
| | - Mingdong Huang
- College of Chemistry, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China; College of Biological Science and Engineering, National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, Fuzhou University, Fuzhou, China; Fujian Key Laboratory of Marine Enzyme Engineering, Fuzhou University, Fuzhou, China.
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2
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Yaglova NV, Obernikhin SS, Timokhina EP, Yaglov VV. Response of Pituitary-Thyroid Axis to a Short-Term Shift in Deuterium Content in the Body. Bull Exp Biol Med 2021; 171:262-264. [PMID: 34173112 DOI: 10.1007/s10517-021-05208-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Indexed: 12/16/2022]
Abstract
We studied functional changes in rat pituitary-thyroid axis after a short-term shift in deuterium body content. Male Wistar rats consumed deuterium-enriched (500,000 ppm) or deuterium-depleted water (10 ppm) for 24 h. Rats of both experimental groups demonstrated elevated concentration of bound with transport proteins thyroxine and reduced level of thyroid-stimulating hormone in serum. No changes in the rate of thyroxine conversion to triiodothyronine were found. Thus, both the increase and reduction of deuterium body content produced similar changes in the function of the pituitary-thyroid axis with primary affection of the thyroid gland, indicative of its higher sensitivity to shift in deuterium levels.
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Affiliation(s)
- N V Yaglova
- Research Institute of Human Morphology, Moscow, Russia.
| | | | - E P Timokhina
- Research Institute of Human Morphology, Moscow, Russia
| | - V V Yaglov
- Research Institute of Human Morphology, Moscow, Russia
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3
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Zhang YL, Liu W, Xu JB, Sun Q, Qiu ZE, Chen L, Huang J, Zhu YX, Zhou WL. Prostaglandin E 2 stimulates anion and fluid secretion triggered by lipopolysaccharide in rat vaginal epithelium. Mol Cell Endocrinol 2021; 526:111219. [PMID: 33610642 DOI: 10.1016/j.mce.2021.111219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 02/08/2021] [Accepted: 02/13/2021] [Indexed: 10/22/2022]
Abstract
Prostaglandin E2 (PGE2) is a principal lipid mediator mediating various biological processes including immune responses and fluid secretion. As the first line of host defense against infection, vaginal epithelium plays orchestrated roles in vaginal innate immunity. However, the effect of PGE2 triggered by pro-inflammatory stimuli on vaginal epithelium remains elusive. This study aimed to investigate the regulatory role of PGE2 on vaginal epithelium after lipopolysaccharide (LPS) stimulation. RT-PCR and western blot analysis revealed that E-prostanoid (EP) receptors EP2 and EP4 were expressed in rat vagina. Basolateral application of PGE2 induced anion secretion mediated by cystic fibrosis transmembrane conductance regulator (CFTR) via EP-adenylate cyclase-cAMP signaling pathway in rat vaginal epithelial cells. The in vivo study showed that PGE2 promoted fluid secretion in rat vagina. Moreover, LPS stimulation facilitated cyclooxygenase-dependent PGE2 synthesis and vaginal fluid secretion in vivo. Conclusively, LPS stimulation triggered epithelium-derived PGE2 production in vaginal epithelium, leading to CFTR-mediated anion secretion and luminal flushing. This study provides valuable insights into the physiological role of PGE2 during vaginal bacterial infection.
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Affiliation(s)
- Yi-Lin Zhang
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China.
| | - Wen Liu
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Jian-Bang Xu
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China; State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangzhou Institute for Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, China
| | - Qing Sun
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Zhuo-Er Qiu
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Lei Chen
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Jiehong Huang
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Yun-Xin Zhu
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China
| | - Wen-Liang Zhou
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, Guangdong, China.
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4
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Tang Y, Xu Q, Yan M, Zhang Y, Zhu P, Li X, Sang L, Zhang M, Huang W, Lin L, Wu J, Xin Y, Fu J, Zhang L, Zhang S, Gu J. Autologous culture method improves retention of tumors' native properties. Sci Rep 2020; 10:20455. [PMID: 33235257 PMCID: PMC7686378 DOI: 10.1038/s41598-020-77238-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Accepted: 11/02/2020] [Indexed: 02/07/2023] Open
Abstract
No current in vitro tumor model replicates a tumor's in vivo microenvironment. A culturing technique that better preserves a tumor's pathophysiological conditions is needed for some important clinical applications, including personalized drug-sensitivity/resistance assays. In this study, we utilized autologous serum or body fluid to build a 3D scaffold and grow a patient's tumor. We named this technique "3D-ACM" (autologous culture method). Forty-five clinical samples from biopsies, surgically removed tumor tissues and malignant body fluids were cultured with 3D-ACM. Traditional 3D-FBS (fetal bovine serum) cultures were performed side-by-side for comparison. The results were that cells cultured in 3D-ACM rebuilt tissue-like structures, and retained their immuno-phenotypes and cytokine productions. In contrast, the 3D-FBS method promoted mesenchymal cell proliferation. In preliminary chemo drug-sensitivity assays, significantly higher mortality was always associated with FBS-cultured cells. Accordingly, 3D-ACM appears to more reliably preserve a tumor's biological characteristics, which might improve the accuracy of drug-testing for personalized cancer treatment.
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Affiliation(s)
- Yao Tang
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China.
- Dalian Municipal Central Hospital, Dalian, 116033, Liaoning, China.
| | - Qian Xu
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Meiling Yan
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Yimin Zhang
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Ping Zhu
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Xianghong Li
- Department of Pathology, Beijing University Cancer Hospital, Beijing, 100142, China
| | - Limin Sang
- Dalian Municipal Central Hospital, Dalian, 116033, Liaoning, China
| | - Ming Zhang
- Dalian Municipal Central Hospital, Dalian, 116033, Liaoning, China
| | - Wenhe Huang
- Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Lianxing Lin
- Shantou Central Hospital, Shantou, 515041, Guangdong, China
| | - Jundong Wu
- Cancer Hospital of Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Yue Xin
- Dalian Municipal Central Hospital, Dalian, 116033, Liaoning, China
| | - Junhui Fu
- Shantou Central Hospital, Shantou, 515041, Guangdong, China
| | - Li Zhang
- Dalian Municipal Central Hospital, Dalian, 116033, Liaoning, China
| | - Shuming Zhang
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China
| | - Jiang Gu
- Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology, Department of Pathology and Pathophysiology, Shantou University Medical College, Shantou, 515041, Guangdong, China.
- Jinxin Research Institute for Reproductive Medicine and Genetics, Chengdu Jinjiang Hospital for Maternal and Child Health Care, Chengdu, 610066, Sichuan, China.
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Abstract
BACKGROUND The oral administration of Infliximab (IFX) antibody would ensure a direct action on inflamed intestinal tissues without side effects. Thus, investigations about its resilience within the intestinal environment are required. OBJECTIVE Quantify the IFX recovery in a simulated upper intestinal environment. METHODS IFX was incubated for different times until 120 min in simulated intestinal fluid (SIF) which differed (i) for pH (7.2 vs 6.8, Exp 1), (ii) for addition or not with pancreatin (Exp 2) and (iii) for addition or not with bovine serum albumin in presence of pancreatin (BSA, Exp 3). RESULTS In Exp 1 the IFX incubated without pancreatin was degraded by about 15% by SIF pH change from 7.2 to 6.8 and after 120 min it was reduced by about 20%. In Exp 2 the presence of pancreatin determined an intense and rapid IFX degradation (recovery < 33%, within 30 min), but when BSA was added to simulate the presence of food protein (Exp 3) the IFX half-life ranged between 59 and 70 min. CONCLUSIONS A discrete in vitro stability of IFX in the upper intestine environment was demonstrated, if food protein is available and competes with pancreatin proteases.
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Follain G, Herrmann D, Harlepp S, Hyenne V, Osmani N, Warren SC, Timpson P, Goetz JG. Fluids and their mechanics in tumour transit: shaping metastasis. Nat Rev Cancer 2020; 20:107-124. [PMID: 31780785 DOI: 10.1038/s41568-019-0221-x] [Citation(s) in RCA: 185] [Impact Index Per Article: 46.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/21/2019] [Indexed: 02/07/2023]
Abstract
Metastasis is a dynamic succession of events involving the dissemination of tumour cells to distant sites within the body, ultimately reducing the survival of patients with cancer. To colonize distant organs and, therefore, systemically disseminate within the organism, cancer cells and associated factors exploit several bodily fluid systems, which provide a natural transportation route. Indeed, the flow mechanics of the blood and lymphatic circulatory systems can be co-opted to improve the efficiency of cancer cell transit from the primary tumour, extravasation and metastatic seeding. Flow rates, vessel size and shear stress can all influence the survival of cancer cells in the circulation and control organotropic seeding patterns. Thus, in addition to using these fluids as a means to travel throughout the body, cancer cells exploit the underlying physical forces within these fluids to successfully seed distant metastases. In this Review, we describe how circulating tumour cells and tumour-associated factors leverage bodily fluids, their underlying forces and imposed stresses during metastasis. As the contribution of bodily fluids and their mechanics raises interesting questions about the biology of the metastatic cascade, an improved understanding of this process might provide a new avenue for targeting cancer cells in transit.
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Affiliation(s)
- Gautier Follain
- INSERM UMR_S1109, Tumor Biomechanics, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - David Herrmann
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, New South Wales, Australia
- St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Sébastien Harlepp
- INSERM UMR_S1109, Tumor Biomechanics, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Vincent Hyenne
- INSERM UMR_S1109, Tumor Biomechanics, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
- CNRS SNC 505, Strasbourg, France
| | - Naël Osmani
- INSERM UMR_S1109, Tumor Biomechanics, Strasbourg, France
- Université de Strasbourg, Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Sean C Warren
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, New South Wales, Australia
- St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Paul Timpson
- The Kinghorn Cancer Centre, Garvan Institute of Medical Research, Sydney, New South Wales, Australia.
- St. Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia.
| | - Jacky G Goetz
- INSERM UMR_S1109, Tumor Biomechanics, Strasbourg, France.
- Université de Strasbourg, Strasbourg, France.
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France.
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7
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Masuda T, Muto S, Fukuda K, Watanabe M, Ohara K, Koepsell H, Vallon V, Nagata D. Osmotic diuresis by SGLT2 inhibition stimulates vasopressin-induced water reabsorption to maintain body fluid volume. Physiol Rep 2020; 8:e14360. [PMID: 31994353 PMCID: PMC6987478 DOI: 10.14814/phy2.14360] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 01/02/2020] [Accepted: 01/05/2020] [Indexed: 12/25/2022] Open
Abstract
Most of the filtered glucose is reabsorbed in the early proximal tubule by the sodium-glucose cotransporter SGLT2. The glycosuric effect of the SGLT2 inhibitor ipragliflozin is linked to a diuretic and natriuretic effect that activates compensatory increases in fluid and food intake to stabilize body fluid volume (BFV). However, the compensatory mechanisms that are activated on the level of renal tubules remain unclear. Type 2 diabetic Goto-Kakizaki (GK) rats were treated with vehicle or 0.01% (in diet) ipragliflozin with free access to fluid and food. After 8 weeks, GK rats were placed in metabolic cages for 24-hr. Ipragliflozin decreased body weight, serum glucose and systolic blood pressure, and increased fluid and food intake, urinary glucose and Na+ excretion, urine volume, and renal osmolar clearance, as well as urine vasopressin and solute-free water reabsorption (TcH2O). BFV, measured by bioimpedance spectroscopy, and fluid balance were similar among the two groups. Urine vasopressin in ipragliflozin-treated rats was negatively and positively associated with fluid balance and TcH2O, respectively. Ipragliflozin increased the renal membrane protein expression of SGLT2, aquaporin (AQP) 2 phosphorylated at Ser269 and vasopressin V2 receptor. The expression of SGLT1, GLUT2, AQP1, and AQP2 was similar between the groups. In conclusion, the SGLT2 inhibitor ipragliflozin induced a sustained glucosuria, diuresis, and natriuresis, with compensatory increases in fluid intake and vasopressin-induced TcH2O in proportion to the reduced fluid balance to maintain BFV. These results indicate that the osmotic diuresis induced by SGLT2 inhibition stimulates compensatory fluid intake and renal water reabsorption to maintain BFV.
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Affiliation(s)
- Takahiro Masuda
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
| | - Shigeaki Muto
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
| | - Keiko Fukuda
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
| | - Minami Watanabe
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
| | - Ken Ohara
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
| | - Hermann Koepsell
- Department of Molecular Plant Physiology and BiophysicsJulius‐von‐Sachs‐Institute of BiosciencesUniversity of WürzburgWürzburgBavariaGermany
| | - Volker Vallon
- Division of Nephrology and HypertensionDepartment of Medicine and PharmacologyUniversity of California San Diego &VA San Diego Healthcare SystemSan DiegoCAUSA
| | - Daisuke Nagata
- Division of NephrologyDepartment of Internal MedicineJichi Medical UniversityShimotsukeTochigiJapan
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8
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Oppelaar JJ, Vogt L. Body Fluid-Independent Effects of Dietary Salt Consumption in Chronic Kidney Disease. Nutrients 2019; 11:E2779. [PMID: 31731658 PMCID: PMC6893804 DOI: 10.3390/nu11112779] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 11/08/2019] [Accepted: 11/11/2019] [Indexed: 02/07/2023] Open
Abstract
The average dietary salt (i.e., sodium chloride) intake in Western society is about 10 g per day. This greatly exceeds the lifestyle recommendations by the WHO to limit dietary salt intake to 5 g. There is robust evidence that excess salt intake is associated with deleterious effects including hypertension, kidney damage and adverse cardiovascular health. In patients with chronic kidney disease, moderate reduction of dietary salt intake has important renoprotective effects and positively influences the efficacy of common pharmacological treatment regimens. During the past several years, it has become clear that besides influencing body fluid volume high salt also induces tissue remodelling and activates immune cell homeostasis. The exact pathophysiological pathway in which these salt-induced fluid-independent effects contribute to CKD is not fully elucidated, nonetheless it is clear that inflammation and the development of fibrosis play a major role in the pathogenic mechanisms of renal diseases. This review focuses on body fluid-independent effects of salt contributing to CKD pathogenesis and cardiovascular health. Additionally, the question whether better understanding of these pathophysiological pathways, related to high salt consumption, might identify new potential treatment options will be discussed.
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Affiliation(s)
| | - Liffert Vogt
- Section of Nephrology, Department of Internal Medicine, Amsterdam Cardiovascular Sciences, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
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Affiliation(s)
- Steven D Anisman
- SVMC Cardiology, Dartmouth Hitchcock Department of Cardiovascular Medicine, Bennington, VT, USA
| | - Stephen B Erickson
- Mayo Clinic, Division of Nephrology and Hypertension, Rochester, MN, USA
| | - Nancy E Morden
- The Dartmouth Institute for Health Policy & Clinical Practice, The Department of Community and Family Medicine, The Geisel School of Medicine at Dartmouth, Hanover, NH, USA
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10
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Breitner EK, Burns KE, Hussain SM, Comfort KK. Implementation of physiological fluids to provide insight into the characterization, fate, and biological interactions of silver nanoparticles. Nanotechnology 2018; 29:254001. [PMID: 29617270 DOI: 10.1088/1361-6528/aabb9d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Silver nanoparticles (AgNPs) are being increasingly utilized in consumer and medical applications. However, there remains conflicting reports on their safety, which are evaluated through a combination of in vitro and in vivo exposure models. These discrepancies may arise, in part, due to the inherent differences between cell-based and animal systems. It is well established that nanotoxicological effects are highly dependent on the unique physicochemical properties and behavior of the particle set, including size, surface chemistry, agglomeration, and ionic dissolution. However, recent studies have identified that these properties vary as a function of exposure environment; providing a rationale for the contradictory results between in vitro and in vivo assessments. Artificial physiological fluids are emerging as a powerful tool as they allow for the characterization of NPs in an environment which they would likely encounter in vivo, in addition to having the experimental advantages of flexibility and consistency. Here, we demonstrated that the utilization of artificial fluids provided a mechanism to assess AgNP behavior and induced bioresponses in environments that they would likely encounter in vivo. AgNPs were introduced within an alveolar-based exposure model, which included alveolar epithelial (A549) cells incubated within artificial alveolar fluid (AF). Additionally, the particles underwent extensive characterization within both AF and lysosomal fluid, which the AgNPs would encounter following cellular internalization. Following incubation in physiological environments AgNP properties were significantly modified versus a traditional media environment, including alterations to both extent of agglomeration and rate of ionic dissolution. Moreover, when A549s were exposed to AgNPs in AF, the cells displayed lower cytotoxicity and stress rates, corresponding to a fluid-dependent drop in silver ion production. This work highlights the need for enhanced in vitro models that more closely mimic in vivo exposure environments in order to capture true NP behaviors and cellular interactions.
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Affiliation(s)
- Emily K Breitner
- Department of Chemical and Materials Engineering, University of Dayton, Dayton, OH 45469, United States of America
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11
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Zhang J, Wei W, Yang L, Pan Y, Wang X, Wang T, Tang S, Yao Y, Hong H, Wei J. Stimulation of cell responses and bone ingrowth into macro-microporous implants of nano-bioglass/polyetheretherketone composite and enhanced antibacterial activity by release of hinokitiol. Colloids Surf B Biointerfaces 2018; 164:347-357. [PMID: 29413616 DOI: 10.1016/j.colsurfb.2018.01.058] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/22/2018] [Accepted: 01/28/2018] [Indexed: 12/17/2022]
Abstract
Poor osteogenesis and bacterial infection lead to the failure of implants, thus enhancements of osteogenic activity and antibacterial activity of the implants have significances in orthopedic applications. In this study, macro-microporous bone implants of nano-bioglass (nBG) and polyetheretherketone (PK) composite (mBPC) were fabricated. The results indicated that the mBPC with the porosity of around 70% exhibited interconnected macropores (sizes of about 400 μm) and micropores (sizes of about 10 μm). The apatite mineralization ability of mBPC in simulated body fluid (SBF) was significantly improved compared with macroporous nBG/PK composite (BPC) without micropores and macroporous PK (mPK). Drug of hinokitiol (HK) was loaded into mBPC (dmBPC), which displayed excellent in vitro antibacterial activity against Staphylococcus aureus. The MC3T3-E1 cells proliferation and ALP activity were significantly promoted by mBPC and dmBPC as compared with BPC and mPK. The micro-CT and histological evaluation showed that both mBPC and dmBPC containing nBG and micropores induced higher new bone formation into porous implants than mPK and BPC. The immunohistochemistry analysis indicated that the expression of BMP-2 in mBPC and dmBPC exhibited obviously higher level than mPK and BPC. The results suggested that the incorporation of nBG and micropores in mBPC obviously improved the osteogenic activity, and mBPC load with HK also promoted osteogenesis, indicating good biocompatibility. The dmBPC with HK significantly enhanced osteogenesis and antibacterial activity, which had great potential as bone implant for hard tissue repair.
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Affiliation(s)
- Jue Zhang
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Wu Wei
- College of Materials Science & Engineering, Nanjing Tech. University, Nanjing, 210009, China
| | - Lili Yang
- Department of Orthopaedic Surgery, Changzheng Hospital, The Second Military Medical University, Shanghai, 200003, China
| | - Yongkang Pan
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Xuehong Wang
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Tinglan Wang
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Songchao Tang
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Yuan Yao
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China
| | - Hua Hong
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China.
| | - Jie Wei
- Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China.
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12
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Wang XX, Li YB, Feng MR, Smith DE. Semi-Mechanistic Population Pharmacokinetic Modeling of L-Histidine Disposition and Brain Uptake in Wildtype and Pht1 Null Mice. Pharm Res 2018; 35:19. [PMID: 29305823 DOI: 10.1007/s11095-017-2322-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 11/22/2017] [Indexed: 01/06/2023]
Abstract
PURPOSE To develop a semi-mechanistic population pharmacokinetic (PK) model to quantitate the disposition kinetics of L-histidine, a peptide-histidine transporter 1 (PHT1) substrate, in the plasma, cerebrospinal fluid and brain parenchyma of wildtype (WT) and Pht1 knockout (KO) mice. METHODS L-[14C]Hisidine (L-His) was administrated to WT and KO mice via tail vein injection, after which plasma, cerebrospinal fluid (CSF) and brain parenchyma samples were collected. A PK model was developed using non-linear mixed effects modeling (NONMEM). The disposition of L-His between the plasma, brain, and CSF was described by a combination of PHT1-mediated uptake, CSF bulk flow and first-order micro-rate constants. RESULTS The PK profile of L-His was best described by a four-compartment model. A more rapid uptake of L-His in brain parenchyma was observed in WT mice due to PHT1-mediated uptake, a process characterized by a Michaelis-Menten component (Vmax = 0.051 nmoL/min and Km = 34.94 μM). CONCLUSIONS A semi-mechanistic population PK model was successfully developed, for the first time, to quantitatively characterize the disposition kinetics of L-His in brain under in vivo conditions. This model may prove a useful tool in predicting the uptake of L-His, and possibly other PHT1 peptide/mimetic substrates, for drug delivery to the brain.
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Affiliation(s)
- Xiao-Xing Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA
| | - Yang-Bing Li
- Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan, 48109, USA
| | - Meihua R Feng
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA
| | - David E Smith
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA.
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Kannan MB, Moore C, Saptarshi S, Somasundaram S, Rahuma M, Lopata AL. Biocompatibility and biodegradation studies of a commercial zinc alloy for temporary mini-implant applications. Sci Rep 2017; 7:15605. [PMID: 29142320 PMCID: PMC5688075 DOI: 10.1038/s41598-017-15873-w] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 11/03/2017] [Indexed: 01/18/2023] Open
Abstract
In this study, the biocompatibility and in vitro degradation behaviour of a commercial zinc-based alloy (Zn-5 Al-4 Mg) were evaluated and compared with that of pure zinc for temporary orthopaedic implant applications. Biocompatibility tests were conducted using human alveolar lung epithelial cells (A549), which showed that the zinc alloy exhibits similar biocompatibility as compared to pure zinc. In vitro degradation evaluation was performed using weight loss and electrochemical methods in simulated body fluid (SBF) at 37 °C. Weight loss measurements revealed that the degradation of the zinc alloy was slightly lower during the initial immersion period (1-3 days), but marginally increased after 5 and 7 days immersion as compared to pure zinc. Potentiodynamic polarisation experiments showed that the zinc alloy exhibits higher degradation rate than pure zinc. However, electrochemical impedance spectroscopy analysis suggests that pure zinc is susceptible to localized degradation, whereas the zinc alloy exhibited passivation behaviour. Post-degradation analysis revealed localized degradation in both pure zinc and the zinc alloy.
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Affiliation(s)
- M Bobby Kannan
- Biomaterials and Engineering Materials (BEM) Laboratory, James Cook University, Townsville, Queensland, 4811, Australia.
| | - Corey Moore
- Biomaterials and Engineering Materials (BEM) Laboratory, James Cook University, Townsville, Queensland, 4811, Australia
| | - Shruti Saptarshi
- Molecular Allergy Research Laboratory, Department of Molecular & Cell Biology James Cook University, Townsville, Queensland, 4811, Australia
| | - Sahadev Somasundaram
- Biomaterials and Engineering Materials (BEM) Laboratory, James Cook University, Townsville, Queensland, 4811, Australia
| | - Mohamed Rahuma
- Biomaterials and Engineering Materials (BEM) Laboratory, James Cook University, Townsville, Queensland, 4811, Australia
| | - Andreas L Lopata
- Molecular Allergy Research Laboratory, Department of Molecular & Cell Biology James Cook University, Townsville, Queensland, 4811, Australia
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Cil O, Phuan PW, Son JH, Zhu JS, Ku CK, Tabib NA, Teuthorn AP, Ferrera L, Zachos NC, Lin R, Galietta LJV, Donowitz M, Kurth MJ, Verkman AS. Phenylquinoxalinone CFTR activator as potential prosecretory therapy for constipation. Transl Res 2017; 182:14-26.e4. [PMID: 27815136 PMCID: PMC5453637 DOI: 10.1016/j.trsl.2016.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/09/2016] [Accepted: 10/06/2016] [Indexed: 11/21/2022]
Abstract
Constipation is a common condition for which current treatments can have limited efficacy. By high-throughput screening, we recently identified a phenylquinoxalinone activator of the cystic fibrosis transmembrane conductance regulator (CFTR) chloride channel that stimulated intestinal fluid secretion and normalized stool output in a mouse model of opioid-induced constipation. Here, we report phenylquinoxalinone structure-activity analysis, mechanism of action, animal efficacy data in acute and chronic models of constipation, and functional data in ex vivo primary cultured human enterocytes. Structure-activity analysis was done on 175 phenylquinoxalinone analogs, including 15 synthesized compounds. The most potent compound, CFTRact-J027, activated CFTR with EC50 ∼ 200 nM, with patch-clamp analysis showing a linear CFTR current-voltage relationship with direct CFTR activation. CFTRact-J027 corrected reduced stool output and hydration in a mouse model of acute constipation produced by scopolamine and in a chronically constipated mouse strain (C3H/HeJ). Direct comparison with the approved prosecretory drugs lubiprostone and linaclotide showed substantially greater intestinal fluid secretion with CFTRact-J027, as well as greater efficacy in a constipation model. As evidence to support efficacy in human constipation, CFTRact-J027 increased transepithelial fluid transport in enteroids generated from normal human small intestine. Also, CFTRact-J027 was rapidly metabolized in vitro in human hepatic microsomes, suggesting minimal systemic exposure upon oral administration. These data establish structure-activity and mechanistic data for phenylquinoxalinone CFTR activators, and support their potential efficacy in human constipation.
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Affiliation(s)
- Onur Cil
- Departments of Medicine and Physiology, University of California San Francisco, San Francisco, Calif
| | - Puay-Wah Phuan
- Departments of Medicine and Physiology, University of California San Francisco, San Francisco, Calif
| | - Jung-Ho Son
- Department of Chemistry, University of California, Davis, Calif
| | - Jie S Zhu
- Department of Chemistry, University of California, Davis, Calif
| | - Colton K Ku
- Department of Chemistry, University of California, Davis, Calif
| | | | | | | | - Nicholas C Zachos
- Departments of Physiology and Medicine, Gastroenterology Division, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Ruxian Lin
- Departments of Physiology and Medicine, Gastroenterology Division, Johns Hopkins University School of Medicine, Baltimore, Md
| | | | - Mark Donowitz
- Departments of Physiology and Medicine, Gastroenterology Division, Johns Hopkins University School of Medicine, Baltimore, Md
| | - Mark J Kurth
- Department of Chemistry, University of California, Davis, Calif
| | - Alan S Verkman
- Departments of Medicine and Physiology, University of California San Francisco, San Francisco, Calif.
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15
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Heerspink HJL, Makino H, Andress D, Brennan JJ, Correa-Rotter R, Coll B, Davis JW, Idler K, Kohan DE, Liu M, Perkovic V, Remuzzi G, Tobe SW, Toto R, Parving HH, de Zeeuw D. Comparison of exposure response relationship of atrasentan between North American and Asian populations. Diabetes Obes Metab 2017; 19:545-552. [PMID: 27981738 DOI: 10.1111/dom.12851] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 12/06/2016] [Accepted: 12/08/2016] [Indexed: 12/25/2022]
Abstract
AIMS The selective endothelin (ET) A receptor antagonist atrasentan has been shown to lower albuminuria in North American and Asian patients with type 2 diabetes and nephropathy. As drug responses to many drugs may differ between North American and Asian populations, we assessed the influence of geographical region on the albuminuria and fluid retention response to atrasentan. MATERIALS AND METHODS Two 12-week double-blind randomised controlled trials were performed with atrasentan 0.75 or 1.25 mg/d vs placebo in patients with type 2 diabetes and nephropathy. The efficacy endpoint was the percentage change in albuminuria. Bodyweight change, a proxy of fluid retention, was used as a safety endpoint. Pharmacodynamics were determined in Asians (N = 77) and North Americans (N = 134). Atrasentan plasma concentration was measured in 161 atrasentan-treated patients. RESULTS Mean albuminuria reduction in Asian, compared to North American, patients was, respectively, -34.4% vs -26.3% for 0.75 mg/d ( P = .44) and -48.0% vs -28.9% for 1.25 mg/d ( P = .035). Bodyweight gain did not differ between North American and Asian populations. Atrasentan plasma concentrations were higher in Asians compared to North Americans and correlated with albuminuria response (7.2% albuminuria reduction per doubling atrasentan concentration; P = .024). Body surface area (β = -1.09 per m2 ; P < .001) and bilirubin, as a marker of hepatic organic anion transporter activity, (β = 0.69 per mg/dL increment; P = .010) were independent determinants of atrasentan plasma concentration; correction by body surface area and bilirubin left no significant difference in plasma concentration between Asian and North American populations. CONCLUSION The higher exposure and albuminuria reduction of atrasentan in Asian patients is not associated with more fluid retention, suggesting that Asian patients are less sensitive to atrasentan-induced sodium retention.
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Affiliation(s)
- Hiddo J L Heerspink
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Hirofumi Makino
- Okayama University Graduate School of Medicine, Okayama City, Okayama, Japan
| | | | | | - Ricardo Correa-Rotter
- Department of Nephrology and Mineral Metabolism, National Medical Science and Nutrition Institute Salvador Zubirán, Mexico City, Mexico
| | - Blai Coll
- Renal Clinical Development, AbbVie, Chicago, Illinois
| | | | - Ken Idler
- Renal Clinical Development, AbbVie, Chicago, Illinois
| | - Donald E Kohan
- Division of Nephrology, University of Utah Health Sciences Center, Salt Lake City, Utah
| | - Mohan Liu
- Renal Clinical Development, AbbVie, Chicago, Illinois
| | - Vlado Perkovic
- George Institute for Global Health, University of Sydney, Sydney, Australia
| | - Giuseppe Remuzzi
- Azienda Ospedaliera Papa Giovanni XXIII and IRCCS-Istituto di Ricerche Farmacologiche Mario Negri, Bergamo, Italy
| | - Sheldon W Tobe
- Department of Hypertension and Nephrology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Robert Toto
- Department of Clinical Science, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Hans-Henrik Parving
- Department of Medical Endocrinology, Rigshospitalet University Hospital of Copenhagen, Copenhagen, Denmark
| | - Dick de Zeeuw
- Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Shahzad H, Giribabu N, Karim K, Kassim NM, Muniandy S, Salleh N. Combinatorial effects of quercetin and sex-steroids on fluid and electrolytes' (Na+, Cl-, HCO3-) secretory mechanisms in the uterus of ovariectomised female Sprague-Dawley rats. PLoS One 2017; 12:e0172765. [PMID: 28253299 PMCID: PMC5333842 DOI: 10.1371/journal.pone.0172765] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 02/09/2017] [Indexed: 12/18/2022] Open
Abstract
Dysregulation of uterine fluid environment could impair successful reproduction and this could be due to the effect of environmental estrogens. Therefore, in this study, effect of quercetin, an environmental estrogen on uterine fluid and electrolytes concentrations were investigated under sex-steroid influence. Ovariectomised adult female Sprague-Dawley rats were given 10, 50 or 100mg/kg/day quercetin subcutaneously with 17-β estradiol (E) for seven days or three days E, then three days E plus progesterone (P) (E+P) treatment. Uterine fluid secretion rate, Na+, Cl- and HCO3- concentrations were determined by in-vivo perfusion. Following sacrifice, uteri were harvested and levels of the proteins of interest were identified by Western blotting and Realtime PCR. Distribution of these proteins in the uterus was observed by immunofluorescence. Levels of uterine cAMP were measured by enzyme-linked immunoassay (EIA). Administration of quercetin at increasing doses increased uterine fluid secretion rate, Na+, Cl- and HCO3- concentrations, but to the levels lesser than that of E. In concordant, levels of CFTR, SLC4A4, ENaC (α, β and γ), Na+/K+-ATPase, GPα/β, AC and cAMP in the uterus increased following increased in the doses of quercetin. Co-administration of quercetin with E caused uterine fluid secretion rate, Na+, Cl- and HCO3- concentrations to decrease. In concordant, uterine CFTR, SLC26A6, SLC4A4, ENaC (α, β and γ), Na+/K+-ATPase, GPα/β, AC and cAMP decreased. Greatest effects were observed following co-administration of 10mg/kg/day quercetin with E. Co-administration of quercetin with E+P caused uterine fluid Na+ and HCO3- concentrations to increase but no changes in fluid secretion rate and Cl- concentration were observed. Co-administration of high dose quercetin (100 mg/kg/day) with E+P caused uterine CFTR, SLC26A6, AC, GPα/β and ENaC (α, β and γ) to increase. Quercetin-induced changes in the uterine fluid secretion rate and electrolytes concentrations could potentially affect the uterine reproductive functions under female sex-steroid influence.
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Affiliation(s)
- Huma Shahzad
- Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, Kuala Lumpur, Malaysia
| | - Nelli Giribabu
- Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, Kuala Lumpur, Malaysia
| | - Kamarulzaman Karim
- Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, Kuala Lumpur, Malaysia
| | - Normadiah M. Kassim
- Department of Anatomy, Faculty of Medicine, University of Malaya, Lembah Pantai, Kuala Lumpur, Malaysia
| | - Sekaran Muniandy
- Department of Biochemistry, Faculty of Medicine and Biomedical Sciences, MAHSA University, Jalan Elmu, Off Jalan University, Kuala Lumpur, Malaysia
| | - Naguib Salleh
- Department of Physiology, Faculty of Medicine, University of Malaya, Lembah Pantai, Kuala Lumpur, Malaysia
- * E-mail:
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17
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Popa AC, Stan GE, Husanu MA, Mercioniu I, Santos LF, Fernandes HR, Ferreira JMF. Bioglass implant-coating interactions in synthetic physiological fluids with varying degrees of biomimicry. Int J Nanomedicine 2017; 12:683-707. [PMID: 28176941 PMCID: PMC5268334 DOI: 10.2147/ijn.s123236] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Synthetic physiological fluids are currently used as a first in vitro bioactivity assessment for bone grafts. Our understanding about the interactions taking place at the fluid-implant interface has evolved remarkably during the last decade, and does not comply with the traditional International Organization for Standardization/final draft International Standard 23317 protocol in purely inorganic simulated body fluid. The advances in our knowledge point to the need of a true paradigm shift toward testing physiological fluids with enhanced biomimicry and a better understanding of the materials' structure-dissolution behavior. This will contribute to "upgrade" our vision of entire cascades of events taking place at the implant surfaces upon immersion in the testing media or after implantation. Starting from an osteoinductive bioglass composition with the ability to alleviate the oxidative stress, thin bioglass films with different degrees of polymerization were deposited onto titanium substrates. Their biomineralization activity in simulated body fluid and in a series of new inorganic-organic media with increasing biomimicry that more closely simulated the human intercellular environment was compared. A comprehensive range of advanced characterization tools (scanning electron microscopy; grazing-incidence X-ray diffraction; Fourier-transform infrared, micro-Raman, energy-dispersive, X-ray photoelectron, and surface-enhanced laser desorption/ionization time-of-flight mass spectroscopies; and cytocompatibility assays using mesenchymal stem cells) were used. The information gathered is very useful to biologists, biophysicists, clinicians, and material scientists with special interest in teaching and research. By combining all the analyses, we propose herein a step forward toward establishing an improved unified protocol for testing the bioactivity of implant materials.
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Affiliation(s)
- AC Popa
- National Institute of Materials Physics, Măgurele
- Army Centre for Medical Research, Bucharest, Romania
| | - GE Stan
- National Institute of Materials Physics, Măgurele
| | - MA Husanu
- National Institute of Materials Physics, Măgurele
| | - I Mercioniu
- National Institute of Materials Physics, Măgurele
| | - LF Santos
- Centro de Química Estrutural, Instituto Superior Técnico (CQE-IST), University of Lisbon, Lisbon
| | - HR Fernandes
- Department of Materials and Ceramics Engineering, Centre for Research in Ceramics and Composite Materials (CICECO), University of Aveiro, Aveiro, Portugal
| | - JMF Ferreira
- Department of Materials and Ceramics Engineering, Centre for Research in Ceramics and Composite Materials (CICECO), University of Aveiro, Aveiro, Portugal
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18
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Abstract
The ever-growing global burden of congestive heart failure (CHF) and type 2 diabetes mellitus (T2DM) as well as their co-existence necessitate that anti-diabetic pharmacotherapy will modulate the cardiovascular risk inherent to T2DM while complying with the accompanying restrictions imposed by CHF. The thiazolidinedione (TZD) family of peroxisome proliferator-activated receptor γ (PPARγ) agonists initially provided a promising therapeutic option in T2DM owing to anti-diabetic efficacy combined with pleiotropic beneficial cardiovascular effects. However, the utility of TZDs in T2DM has declined in the past decade, largely due to concomitant adverse effects of fluid retention and edema formation attributed to salt-retaining effects of PPARγ activation on the nephron. Presumably, the latter effects are potentially deleterious in the context of pre-existing fluid retention in CHF. However, despite a considerable body of evidence on mechanisms responsible for TZD-induced fluid retention suggesting that this class of drugs is rightfully prohibited from use in CHF patients, there is a paucity of experimental and clinical studies that investigate the effects of TZDs on salt and water homeostasis in the CHF setting. In an attempt to elucidate whether TZDs actually exacerbate the pre-existing fluid retention in CHF, our review summarizes the pathophysiology of fluid retention in CHF. Moreover, we thoroughly review the available data on TZD-induced fluid retention and proposed mechanisms in animals and patients. Finally, we will present recent studies challenging the common notion that TZDs worsen renal salt and water retention in CHF.
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Affiliation(s)
- Ilia Goltsman
- Department of Physiology, Biophysics and Systems Biology, The Bruce Rappaport, Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Emad E Khoury
- Department of Physiology, Biophysics and Systems Biology, The Bruce Rappaport, Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Joseph Winaver
- Department of Physiology, Biophysics and Systems Biology, The Bruce Rappaport, Rappaport Faculty of Medicine, Technion, Haifa, Israel
| | - Zaid Abassi
- Department of Physiology, Biophysics and Systems Biology, The Bruce Rappaport, Rappaport Faculty of Medicine, Technion, Haifa, Israel; Department of Laboratory Medicine, Rambam Human Health Care Campus, Haifa, Israel.
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19
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Su CW, Chiang MY, Lin YL, Tsai NM, Chen YP, Li WM, Hsu CH, Chen SY. Sodium Dodecyl Sulfate-Modified Doxorubicin-Loaded Chitosan-Lipid Nanocarrier with Multi Polysaccharide-Lecithin Nanoarchitecture for Augmented Bioavailability and Stability of Oral Administration In Vitro and In Vivo. J Biomed Nanotechnol 2016; 12:962-72. [PMID: 27305818 DOI: 10.1166/jbn.2016.2227] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
For oral anti-cancer drug delivery, a new chitosan-lipid nanoparticle with sodium dodecyl sulfate modification was designed and synthesized using a double emulsification. TEM examination showed that the DOX-loaded nanoparticles, termed D-PL/TG NPs, exhibited a unique core-shell configuration composed of multiple amphiphilic chitosan-lecithin reverse micelles as the core and a triglyceride shell as a physical barrier to improve the encapsulation efficiency and reduce the drug leakage. In addition, the D-PL/TG NPs with sodium dodecyl sulfate modification on the surface have enhanced stability in the GI tract and increased oral bioavailability of doxorubicin. In vitro transport studies performed on Caco-2 monolayers indicated that the D-PL/TG NPs enhanced the permeability of DOX in the Caco-2 monolayers by altering the transport pathway from passive diffusion to transcytosis. The in vivo intestinal absorption assay suggested that the D-PL/TG NPs were preferentially absorbed through the specialized membranous epithelial cells (M cells) of the Peyer's patches, resulting in a significant improvement (8-fold) in oral bioavailability compared to that of free DOX. The experimental outcomes in this work demonstrate that the D-PL/TG NPs provide an exciting opportunity for advances in the oral administration of drugs with poor bioavailability that are usually used in treating tough and chronic diseases.
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20
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Xu B, Huang X, Wei X, Zeng Y. [Intraperitoneal transplantation of acellular extracellular matrix-derived biomaterial has no response to innate immunity in mice]. Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi 2016; 32:721-725. [PMID: 27371834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Objective To explore the effect of acellular extracellular matrix (ECM) transplantation on the innate immunity (including macrophages and neutrophils) of mice, and establish a method evaluating the immunogenicity of acellular ECM material in mice as experimental animals. Methods Fresh membrane material and newly-processed acellular ECM material without DNA were separately intraperitoneally transplanted into mice. Seven days later, samples were collected to measure spleen index. The absolute numbers of neutrophils in peripheral blood and macrophages in peritoneal fluid were determined by BD Trucount tubes. The concentrations of interleukin 2 (IL-2), IL-4, IL-6, interferon-γ (IFN-γ), tumor necrosis factor α (TNF-α), IL-17A and IL-10 in the plasma and peritoneal fluid were detected by BD(TM) Cytometric Bead Array (CBA) mouse Th1/Th2/Th17 cytokine kit. Results Compared with sham group, the body mass is not increased in the mice transplanted with fresh membrane material, but the spleen index increased. The fresh material could dramatically increase the numbers of neutrophils in peripheral blood and macrophages in peritoneal fluid, and increase IL-6 and IFN-γ production. However, acellular ECM material prepared by improved technique only had minor or even no effect on those parameters. Conclusion Acellular ECM material with DNA removed has no obvious response to the inherent immunity in mice.
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Affiliation(s)
- Bin Xu
- Institute of Tissue Transplantation and Immunology, College of Life Science and Technology, Jinan University, Guangzhou 510632; Grandhope Biotech Co., Ltd, National Engineering Laboratory for Regenerative Implantable Medical Devices, Guangzhou 510530, China
| | - Xiuyan Huang
- Institute of Tissue Transplantation and Immunology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Xiaohui Wei
- Grandhope Biotech Co., Ltd, National Engineering Laboratory for Regenerative Implantable Medical Devices, Guangzhou 510530, China
| | - Yaoying Zeng
- Institute of Tissue Transplantation and Immunology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China. *Corresponding author, E-mail:
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21
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Guzoglu N, Uras N, Aksoy HT, Eras Z, Oguz SS, Dilmen U. Dopamine treatment does not need speed recovery of newborns from transient tachypnea. J Perinat Med 2016; 44:477-80. [PMID: 26352063 DOI: 10.1515/jpm-2015-0077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 06/17/2015] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Transient tachypnea of the newborn (TTN) results from inadequate neonatal lung fluid clearance. Low-dose dopamine induces natriuresis in the kidneys and it has been assumed that, at this low dosage, dopamine increases renal perfusion in critically ill patients. Medium doses have positive inotropic and chronotropic effects via increased β-receptor activation. Recent studies have demonstrated that dopamine stimulates the clearance of pulmonary edema. Furthermore, β-adrenergic agonists regulate Na+ channels and Na-K-ATPase activity in the pulmonary epithelium. This study investigated the effect of dopamine at different dosages on TTN treatment. METHODS A prospective controlled study examined 60 infants with TTN older than 34 weeks of gestation who required at least 24 h of O2 and nasal continuous positive airway pressure (nCPAP) treatment. The infants were randomized into three groups of 20: controls, infants treated with low-dose dopamine (3 μg/kg/min), and infants treated with a medium dose (5 μg/kg/min). The control and study groups were compared in terms of the requirement for mechanical ventilation, and the durations of nCPAP, oxygen requirement, and hospitalization. RESULTS The requirement for mechanical ventilation, and durations of nCPAP, oxygen requirement, and hospitalization did not differ significantly among the three groups (P=0.54, 0.16 and 0.11, respectively). CONCLUSION Dopamine treatment in low-moderate doses does not improve the outcome in TTN. Thus, further studies in this area are needed.
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Ramanathan R, Jiang Y, Read B, Golan-Paz S, Woodrow KA. Biophysical characterization of small molecule antiviral-loaded nanolipogels for HIV-1 chemoprophylaxis and topical mucosal application. Acta Biomater 2016; 36:122-31. [PMID: 26947382 PMCID: PMC5678975 DOI: 10.1016/j.actbio.2016.02.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/20/2016] [Accepted: 02/22/2016] [Indexed: 01/08/2023]
Abstract
UNLABELLED Nanocarriers are versatile vehicles for drug delivery, and emerging as platforms to formulate and deliver multiple classes of antiretroviral (ARV) drugs in a single system. Here we describe the fabrication of hydrogel-core and lipid-shell nanoparticles (nanolipogels) for the controlled loading and topical, vaginal delivery of maraviroc (MVC) and tenofovir disoproxil fumarate (TDF), two ARV drugs with different mechanisms of action that are used in the treatment of HIV. The nanolipogel platform was used to successfully formulate MVC and TDF, which produced ARV drug-loaded nanolipogels that were characterized for their physical properties and antiviral activity against HIV-1 BaL in cell culture. We also show that administration of these drug carriers topically to the vaginal mucosa in a murine model leads to antiviral activity against HIV-1 BaL in cervicovaginal lavages. Our results suggest that nanolipogel carriers are promising for the encapsulation and delivery of hydrophilic small molecule ARV drugs, and may expand the nanocarrier systems being investigated for HIV prevention or treatment. STATEMENT OF SIGNIFICANCE Topical, mucosal intervention of HIV is a leading strategy in the efforts to curb the spread of viral infection. A significant research thrust in the field has been to characterize different dosage forms for formulation of physicochemically diverse antiretroviral drugs. Nanocarriers have been used to formulate and deliver small molecule and protein drugs for a range of applications, including ARV drugs for HIV treatment. The broad significance of our work includes evaluation of lipid-shell, hydrogel-core nanoparticles for formulation and topical, vaginal delivery of two water-soluble antiretroviral drugs. We have characterized these nanocarriers for their physical properties and their biological activity against HIV-1 infection in vitro, and demonstrated the ability to deliver drug-loaded nanocarriers in vivo.
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Affiliation(s)
- R Ramanathan
- 3720 15th Ave NE, Foege Hall, Department of Bioengineering, University of Washington, Seattle, WA, USA.
| | - Y Jiang
- 3720 15th Ave NE, Foege Hall, Department of Bioengineering, University of Washington, Seattle, WA, USA.
| | - B Read
- 3720 15th Ave NE, Foege Hall, Department of Bioengineering, University of Washington, Seattle, WA, USA.
| | - S Golan-Paz
- 3720 15th Ave NE, Foege Hall, Department of Bioengineering, University of Washington, Seattle, WA, USA.
| | - K A Woodrow
- 3720 15th Ave NE, Foege Hall, Department of Bioengineering, University of Washington, Seattle, WA, USA.
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Zhao S, Wang H, Zhang Y, Huang W, Rahaman MN, Liu Z, Wang D, Zhang C. Copper-doped borosilicate bioactive glass scaffolds with improved angiogenic and osteogenic capacity for repairing osseous defects. Acta Biomater 2015; 14:185-96. [PMID: 25534470 DOI: 10.1016/j.actbio.2014.12.010] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 12/03/2014] [Accepted: 12/14/2014] [Indexed: 12/26/2022]
Abstract
There is growing interest in the use of synthetic biomaterials to deliver inorganic ions that are known to stimulate angiogenesis and osteogenesis in vivo. In the present study, we investigated the effects of varying amounts of copper in a bioactive glass on the response of human bone marrow-derived mesenchymal stem cells (hBMSCs) in vitro and on blood vessel formation and bone regeneration in rat calvarial defects in vivo. Porous scaffolds of a borosilicate bioactive glass (composition 6Na2O, 8K2O, 8MgO, 22CaO, 36B2O3, 18SiO2, 2P2O5, mol.%) doped with 0.5, 1.0 and 3.0wt.% CuO were created using a foam replication method. When immersed in simulated body fluid, the scaffolds released Cu ions into the medium and converted to hydroxyapatite. At the concentrations used, the Cu in the glass was not toxic to the hBMSCs cultured on the scaffolds in vitro. The alkaline phosphatase activity of the hBMSCs and the expression levels of angiogenic-related genes (vascular endothelial growth factor and basic fibroblast growth factor) and osteogenic-related genes (runt-related transcription factor 2, bone morphogenetic protein-2 and osteopontin) increased significantly with increasing amount of Cu in the glass. When implanted in rat calvarial defects in vivo, the scaffolds (3wt.% CuO) significantly enhanced both blood vessel formation and bone regeneration in the defects at 8weeks post-implantation. These results show that doping bioactive glass implants with Cu is a promising approach for enhancing angiogenesis and osteogenesis in the healing of osseous defects.
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Affiliation(s)
- Shichang Zhao
- Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Hui Wang
- School of Materials Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Yadong Zhang
- Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, People's Republic of China
| | - Wenhai Huang
- School of Materials Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Mohamed N Rahaman
- Department of Materials Science and Engineering, and Center for Biomedical Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0340, USA
| | - Zhongtang Liu
- Department of Orthopaedics, Shanghai Hospital, Second Military Medical University, Shanghai 200433, People's Republic of China
| | - Deping Wang
- School of Materials Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
| | - Changqing Zhang
- Department of Orthopedic Surgery, Shanghai Sixth People's Hospital, Shanghai Jiaotong University, Shanghai 200233, People's Republic of China.
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Braydich-Stolle LK, Breitner EK, Comfort KK, Schlager JJ, Hussain SM. Dynamic characteristics of silver nanoparticles in physiological fluids: toxicological implications. Langmuir 2014; 30:15309-15316. [PMID: 25496452 DOI: 10.1021/la5036079] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The field of nanotoxicology has made tremendous progress identifying novel and potentially adverse biological effects following nanomaterial (NM) exposure. However, one facet yet to be satisfactorily explored is how a physiological environment modifies NM physicochemical properties, thus introducing novel complexities associated with solid phase material exposures. In this study, artificial alveolar, lysosomal, and interstitial fluids were used to identify environmental-specific modulations to the properties and behavior of hydrocarbon-coated (Ag-HC) and polysaccharide-coated (Ag-PS) silver NMs. As inhalation is a common route of exposure, an alveolar macrophage cell model with deposition dosages representing approximately 2.5 months and 10 years of occupational exposure (0.5 and 25 ng/mL, respectively) were employed. Following dispersion in the artificial fluids, the Ag-HC and Ag-PS NMs demonstrated significant alterations to morphology, aggregation patterns, and particle reactivity. However, the Ag-PS also demonstrated a loss of particle coating, which elicited increased cytotoxicity, phagocytosis, and inflammation not associated with the original Ag-PS. This study demonstrated that in a physiological system NMs undergo considerable modulation, introducing a scenario where the toxicity of NMs may increase over time due to internal bioconditions. These findings highlight the critical influence that the dynamic and insoluble nature of NMs have on bioeffects and the importance of characterizing this behavior.
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Affiliation(s)
- Laura K Braydich-Stolle
- Molecular Bioeffects Branch, Bioeffects Division, Human Effectiveness Directorate, Human Performance Wing, Air Force Research Laboratory, Wright-Patterson AFB , Dayton, Ohio 45433, United States
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Fu Y, Gerasimova M, Batz F, Kuczkowski A, Alam Y, Sanders PW, Ronzaud C, Hummler E, Vallon V. PPARγ agonist-induced fluid retention depends on αENaC expression in connecting tubules. Nephron Clin Pract 2014; 129:68-74. [PMID: 25531136 DOI: 10.1159/000370254] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 11/27/2014] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND/AIMS Thiazolidinediones (TZDs, like rosiglitazone (RGZ)) are peroxisome proliferator-activated receptor γ (PPARγ) agonists used to treat type 2 diabetes. Clinical limitations include TZD-induced fluid retention and body weight (BW) increase, which are inhibited by amiloride, an epithelial-sodium channel (ENaC) blocker. RGZ-induced fluid retention is maintained in mice with αENaC knockdown in the collecting duct (CD). Since ENaC in the connecting tubule (CNT) rather than in CD appears to be critical for normal NaCl retention, we aimed to further explore the role of ENaC in CNT in RGZ-induced fluid retention. METHODS Mice with conditional inactivation of αENaC in both CNT and CD were used (αENaC lox/lox AQP2-Cre; 'αENaC-CNT/CD-KO') and compared with littermate controls (αENaC lox/lox mice; 'WT'). BW was monitored and total body water (TBW) and extracellular fluid volume (ECF) were determined by bioelectrical impedance spectroscopy (BIS) before and after RGZ (320 mg/kg diet for 10 days). RESULTS On regular NaCl diet, αENaC-CNT/CD-KO had normal BW, TBW, ECF, hematocrit, and plasma Na(+), K(+), and creatinine, associated with an increase in plasma aldosterone compared with WT. Challenging αENaC-CNT/CD-KO with a low NaCl diet unmasked impaired NaCl and K homeostasis, consistent with effective knockdown of αENaC. In WT, RGZ increased BW (+6.1%), TBW (+8.4%) and ECF (+10%), consistent with fluid retention. These changes were significantly attenuated in αENaC-CNT/CD-KO (+3.4, 1.3, and 4.3%). CONCLUSION Together with the previous studies, the current results are consistent with a role of αENaC in CNT in RGZ-induced fluid retention, which dovetails with the physiological relevance of ENaC in this segment.
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Tapolyai M, Faludi M, Dossabhoy NR, Barna I, Lengvárszky Z, Szarvas T, Berta K, Fülöp T. Diuretics and bioimpedance-measured fluid spaces in hypertensive patients. J Clin Hypertens (Greenwich) 2014; 16:895-9. [PMID: 25329360 PMCID: PMC8032123 DOI: 10.1111/jch.12428] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 09/03/2014] [Accepted: 09/04/2014] [Indexed: 09/20/2023]
Abstract
The authors examined the relationship between thiazide-type diuretics and fluid spaces in a cohort of hypertensive patients in a retrospective study of 60 stable hypertensive patients without renal abnormalities who underwent whole-body bioimpedance analysis. Overhydration was greater in the diuretic group, but only to a nonsignificant degree (5.9 vs. 2.9%; P=.21). The total body water did not differ in the two groups (41.8 L vs. 40.5 L; P=.64). Extracellular fluid volume (ECV) (19.7 L vs. 18.5 L; P=.35) and intracellular fluid volume (ICV) spaces (20.8 L vs. 21.3 L; P=.75) were also not significantly different in the two groups. The ratio of ICV:ECV, however, appeared different: 1.05 vs 1.15 (P=.017) and the effect was maintained in the linear regression-adjusted model (β coefficient: -0.143; P=.001). The diuretic-related distortion of ICV:ECV ratio indicates potential fluid redistribution in hypertensive patients, with ICV participating in the process.
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Affiliation(s)
- Mihály Tapolyai
- Fresenius Medical Care HungarySemmelweis UniversityBudapestHungary
- Carolinas CampusEdward Via Osteopathic College of MedicineSpartanburgSC
| | - Mária Faludi
- Fresenius Medical Care HungarySemmelweis UniversityBudapestHungary
| | | | | | | | - Tibor Szarvas
- Department of MathematicsLouisiana State UniversityShreveportLA
| | - Klára Berta
- Fresenius Medical Care HungarySemmelweis UniversityBudapestHungary
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Gordin DM, Ion R, Vasilescu C, Drob SI, Cimpean A, Gloriant T. Potentiality of the "Gum Metal" titanium-based alloy for biomedical applications. Mater Sci Eng C Mater Biol Appl 2014; 44:362-70. [PMID: 25280716 DOI: 10.1016/j.msec.2014.08.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 06/24/2014] [Accepted: 08/01/2014] [Indexed: 11/17/2022]
Abstract
In this study, the "Gum Metal" titanium-based alloy (Ti-23Nb-0.7Ta-2Zr-1.2O) was synthesized by melting and then characterized in order to evaluate its potential for biomedical applications. Thus, the mechanical properties, the corrosion resistance in simulated body fluid and the in vitro cell response were investigated. It was shown that this alloy presents a very high strength, a low Young's modulus and a high recoverable strain by comparison with the titanium alloys currently used in medicine. On the other hand, all electrochemical and corrosion parameters exhibited more favorable values showing a nobler behavior and negligible toxicity in comparison with the commercially pure Ti taken as reference. Furthermore, the biocompatibility tests showed that this alloy induced an excellent response of MC3T3-E1 pre-osteoblasts in terms of attachment, spreading, viability, proliferation and differentiation. Consequently, the "Gum Metal" titanium-based alloy processes useful characteristics for the manufacturing of highly biocompatible medical devices.
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Affiliation(s)
- D M Gordin
- Institut des Sciences Chimiques de Rennes (UMR CNRS 6226), INSA Rennes, 20 Avenue des Buttes de Coësmes, F-35043 Rennes Cedex, France
| | - R Ion
- University of Bucharest, Department of Biochemistry and Molecular Biology, 91-95 Spl. Independentei, 050095 Bucharest, Romania
| | - C Vasilescu
- Institute of Physical Chemistry "Ilie Murgulescu" of Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania
| | - S I Drob
- Institute of Physical Chemistry "Ilie Murgulescu" of Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania
| | - A Cimpean
- University of Bucharest, Department of Biochemistry and Molecular Biology, 91-95 Spl. Independentei, 050095 Bucharest, Romania
| | - T Gloriant
- Institut des Sciences Chimiques de Rennes (UMR CNRS 6226), INSA Rennes, 20 Avenue des Buttes de Coësmes, F-35043 Rennes Cedex, France.
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Aja M, Jaya M, Vijayakumaran Nair K, Joe IH. FT-IR spectroscopy as a sentinel technology in earthworm toxicology. Spectrochim Acta A Mol Biomol Spectrosc 2013; 120:534-541. [PMID: 24374480 DOI: 10.1016/j.saa.2013.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 11/20/2013] [Accepted: 12/04/2013] [Indexed: 06/03/2023]
Abstract
FT-IR spectroscopy is a useful tool for determining the biomolecular profile of micro-samples of body fluids such as coelomic fluid of earthworms. The present study focuses on the usefulness of the earthworm (Perionyx sansibaricus) coelomic fluid for observing pathologically induced biochemical changes. Compared to controls, appreciable changes in expression of peaks were observed in worms exposed to seven selected xenobiotics (pesticides, heavy metals, herbicides and detergents). Observation of bands in the region 1600-1690 cm(-1) indicates the presence of amide I band in all the worms. The peak at 2364 cm(-1) present as a weak band on day 7 of treatment, is shifted to 2358/2359 cm(-1) and more pronounced in most of the treated groups on day 14. Presence of band at 1663 cm(-1) in controls is attributed to CO stretching vibration representing the amino acid, glutamic acid. Under toxicological conditions vibration in this region is absent. Presence of the amino acid arginine (1633 cm(-1)) and lysine (1629 cm(-1)) and absence of glutamic acid (1663 cm(-1)) under toxicological stress were characteristic. FT-IR spectra of the coelomic fluid were similar under the sublethal and lethal concentrations of the test chemicals. The potential use of FT-IR spectral information as baseline data for toxicological studies and for monitoring the quality of the environment is recommended.
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Affiliation(s)
- M Aja
- Department of Zoology, Mar Ivanios College, Thiruvananthapuram 695 015, Kerala, India
| | - M Jaya
- Department of Zoology, Mar Ivanios College, Thiruvananthapuram 695 015, Kerala, India
| | - K Vijayakumaran Nair
- Department of Zoology, Mar Ivanios College, Thiruvananthapuram 695 015, Kerala, India
| | - I Hubert Joe
- Centre of Molecular and Biophysics Research, Department of Physics, Mar Ivanios College, Thiruvananthapuram 695 015, Kerala, India.
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Suito H, Iwawaki Y, Goto T, Tomotake Y, Ichikawa T. Oral factors affecting titanium elution and corrosion: an in vitro study using simulated body fluid. PLoS One 2013; 8:e66052. [PMID: 23762461 PMCID: PMC3676376 DOI: 10.1371/journal.pone.0066052] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Accepted: 05/03/2013] [Indexed: 01/20/2023] Open
Abstract
Objectives Ti, which is biocompatible and resistant to corrosion, is widely used for dental implants, particularly in patients allergic to other materials. However, numerous studies have reported on Ti allergy and the in vitro corrosion of Ti. This study investigated the conditions that promote the elution of Ti ions from Ti implants. Methods Specimens of commercially pure Ti, pure nickel, a magnetic alloy, and a gold alloy were tested. Each specimen was immersed in a simulated body fluid (SBF) whose pH value was controlled (2.0, 3.0, 5.0, 7.4, and 9.0) using either hydrochloric or lactic acid. The parameters investigated were the following: duration of immersion, pH of the SBF, contact with a dissimilar metal, and mechanical stimulus. The amounts of Ti ions eluted were measured using a polarized Zeeman atomic absorption spectrophotometer. Results Eluted Ti ions were detected after 24 h (pH of 2.0 and 3.0) and after 48 h (pH of 9.0). However, even after 4 weeks, eluted Ti ions were not detected in SBF solutions with pH values of 5.0 and 7.4. Ti elution was affected by immersion time, pH, acid type, mechanical stimulus, and contact with a dissimilar metal. Elution of Ti ions in a Candida albicans culture medium was observed after 72 h. Significance Elution of Ti ions in the SBF was influenced by its pH and by crevice corrosion. The results of this study elucidate the conditions that lead to the elution of Ti ions in humans, which results in implant corrosion and Ti allergy.
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Affiliation(s)
- Hideki Suito
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan
| | - Yuki Iwawaki
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan
| | - Takaharu Goto
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan
| | - Yoritoki Tomotake
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan
| | - Tetsuo Ichikawa
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences, The University of Tokushima, Tokushima, Japan
- * E-mail:
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Kudgus RA, Szabolcs A, Khan JA, Walden CA, Reid JM, Robertson JD, Bhattacharya R, Mukherjee P. Inhibiting the growth of pancreatic adenocarcinoma in vitro and in vivo through targeted treatment with designer gold nanotherapeutics. PLoS One 2013; 8:e57522. [PMID: 23483913 PMCID: PMC3590245 DOI: 10.1371/journal.pone.0057522] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Accepted: 01/22/2013] [Indexed: 01/05/2023] Open
Abstract
Background Pancreatic cancer is one of the deadliest of all human malignancies with limited options for therapy. Here, we report the development of an optimized targeted drug delivery system to inhibit advanced stage pancreatic tumor growth in an orthotopic mouse model. Method/Principal Findings Targeting specificity in vitro was confirmed by preincubation of the pancreatic cancer cells with C225 as well as Nitrobenzylthioinosine (NBMPR - nucleoside transporter (NT) inhibitor). Upon nanoconjugation functional activity of gemcitabine was retained as tested using a thymidine incorporation assay. Significant stability of the nanoconjugates was maintained, with only 12% release of gemcitabine over a 24-hour period in mouse plasma. Finally, an in vivo study demonstrated the inhibition of tumor growth through targeted delivery of a low dose of gemcitabine in an orthotopic model of pancreatic cancer, mimicking an advanced stage of the disease. Conclusion We demonstrated in this study that the gold nanoparticle-based therapeutic containing gemcitabine inhibited tumor growth in an advanced stage of the disease in an orthotopic model of pancreatic cancer. Future work would focus on understanding the pharmacokinetics and combining active targeting with passive targeting to further improve the therapeutic efficacy and increase survival.
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Affiliation(s)
- Rachel A. Kudgus
- Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Annamaria Szabolcs
- Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Jameel Ahmad Khan
- Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Chad A. Walden
- Department of Physiology and Biomedical Engineering, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Joel M. Reid
- Department of Physiology and Biomedical Engineering, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - J. David Robertson
- Department of Chemistry and University of Missouri Research Reactor, University of Missouri, Columbia, Missouri, United States of America
| | - Resham Bhattacharya
- Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Priyabrata Mukherjee
- Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Department of Physiology and Biomedical Engineering, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Mayo Clinic Cancer Center, College of Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- * E-mail:
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Mori T, Oba I, Koizumi K, Kodama M, Shimanuki M, Tanno M, Chida M, Saito M, Kiyomoto H, Miyazaki M, Ogawa S, Sato H, Ito S. Beneficial role of tolvaptan in the control of body fluids without reductions in residual renal function in patients undergoing peritoneal dialysis. Adv Perit Dial 2013; 29:33-37. [PMID: 24344488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The V2 receptor antagonist tolvaptan has been approved for volume control in heart-failure patients in Japan. Tolvaptan increases renal blood flow, and so the present study was designed to ascertain whether tolvaptan could be a useful diuretic for volume control without reducing residual renal function (RRF) in peritoneal dialysis (PD) patients. Tolvaptan was administered in 15 PD patients (15 mg daily). Urine volume, body weight, and blood pressure were monitored Urinary excretion of urea nitrogen Na+, the osmolality of plasma and urine, and peritoneal and renal Kt/V were analyzed before and after tolvaptan treatment. In 11 of 15 patients, urine volume increased to more than 400 mL daily. A significant increase in diluted urine was observed, as indicated by a reduction in the specific gravity or osmolality of urine (or both). Urinary excretion of urea nitrogen, and Na+ was significantly increased Increases in renal Kt/V were observed, but peritoneal Kt/V was unchanged. Singnificant increase in creatinine clearance was also observed These data suggest that tolvaptan not only stimulates water diuresis, but also natriuresis, without reducing RRF in PD patients. Hence, tolvaptan could be a beneficial tool for the control of body fluid and maintenance of RRF in PD patients.
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Affiliation(s)
- Takefumi Mori
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.
| | - Ikuko Oba
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kenji Koizumi
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Mayumi Kodama
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Miwako Shimanuki
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Mizuho Tanno
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Makiko Chida
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Mai Saito
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hideyasu Kiyomoto
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Mariko Miyazaki
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Susumu Ogawa
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hiroshi Sato
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Sadayoshi Ito
- Division of Nephrology, Endocrinology and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
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Chandiramani M, Seed PT, Orsi NM, Ekbote UV, Bennett PR, Shennan AH, Tribe RM. Limited relationship between cervico-vaginal fluid cytokine profiles and cervical shortening in women at high risk of spontaneous preterm birth. PLoS One 2012; 7:e52412. [PMID: 23300664 PMCID: PMC3530581 DOI: 10.1371/journal.pone.0052412] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 11/13/2012] [Indexed: 11/20/2022] Open
Abstract
Objective To determine the relationship between high vaginal pro-inflammatory cytokines and cervical shortening in women at high risk of spontaneous preterm labor and to assess the influence of cervical cerclage and vaginal progesterone on this relationship. Methods This prospective longitudinal observational study assessed 112 women with at least one previous preterm delivery between 16 and 34 weeks’ gestation. Transvaginal cervical length was measured and cervico-vaginal fluid sampled every two weeks until 28 weeks. If the cervix shortened (<25 mm) before 24 weeks’ gestation, women (cases) were randomly assigned to cerclage or progesterone and sampled weekly. Cytokine concentrations were measured in a subset of cervico-vaginal fluid samples (n = 477 from 78 women) by 11-plex fluid-phase immunoassay. Results All 11 inflammatory cytokines investigated were detected in cervico-vaginal fluid from women at high risk of preterm birth, irrespective of later cervical shortening. At less than 24 weeks’ gestation and prior to intervention, women destined to develop a short cervix (n = 36) exhibited higher cervico-vaginal concentrations than controls (n = 42) of granulocyte-macrophage colony-stimulating factor [(GM-CSF) 16.2 fold increase, confidence interval (CI) 1.8–147; p = 0.01] and monocyte chemotactic protein-1 [(MCP-1) 4.8, CI 1.0–23.0; p = 0.05]. Other cytokines were similar between cases and controls. Progesterone treatment did not suppress cytokine concentrations. Interleukin (IL)-6, IL-8, granulocyte colony-stimulating factor (G-CSF), interferon (IFN)-γ and tumour necrosis factor (TNF)-α concentrations were higher following randomization to cerclage versus progesterone (p<0.05). Cerclage, but not progesterone treatment, was followed by a significant increase in cervical length [mean 11.4 mm, CI 5.0–17.7; p<0.001]. Conclusions Although GM-CSF and MCP-1 cervico-vaginal fluid concentrations were raised, the majority of cervico-vaginal cytokines did not increase in association with cervical shortening. Progesterone treatment showed no significant anti-inflammation action on cytokine concentrations. Cerclage insertion was associated with an increase in the majority of inflammatory markers and cervical length.
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Affiliation(s)
- Manju Chandiramani
- Division of Women's Health, King's College London, London, United Kingdom.
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Monopoli MP, Aberg C, Salvati A, Dawson KA. Biomolecular coronas provide the biological identity of nanosized materials. Nat Nanotechnol 2012; 7:779-86. [PMID: 23212421 DOI: 10.1038/nnano.2012.207] [Citation(s) in RCA: 1821] [Impact Index Per Article: 151.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 10/14/2012] [Indexed: 05/18/2023]
Abstract
The search for understanding the interactions of nanosized materials with living organisms is leading to the rapid development of key applications, including improved drug delivery by targeting nanoparticles, and resolution of the potential threat of nanotechnological devices to organisms and the environment. Unless they are specifically designed to avoid it, nanoparticles in contact with biological fluids are rapidly covered by a selected group of biomolecules to form a corona that interacts with biological systems. Here we review the basic concept of the nanoparticle corona and its structure and composition, and highlight how the properties of the corona may be linked to its biological impacts. We conclude with a critical assessment of the key problems that need to be resolved in the near future.
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Affiliation(s)
- Marco P Monopoli
- Centre for BioNano Interactions, School of Chemistry and Chemical Biology, Belfield, Dublin 4, Ireland
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Choudhary L, Raman RKS. Magnesium alloys as body implants: fracture mechanism under dynamic and static loadings in a physiological environment. Acta Biomater 2012; 8:916-23. [PMID: 22075121 DOI: 10.1016/j.actbio.2011.10.031] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 10/23/2011] [Accepted: 10/24/2011] [Indexed: 11/19/2022]
Abstract
It is essential that a metallic implant material possesses adequate resistance to cracking/fracture under the synergistic action of a corrosive physiological environment and mechanical loading (i.e. stress corrosion cracking (SCC)), before the implant can be put to actual use. This paper presents a critique of the fundamental issues with an assessment of SCC of a rapidly corroding material such as magnesium alloys, and describes an investigation into the mechanism of SCC of a magnesium alloy in a physiological environment. The SCC susceptibility of the alloy in a simulated human body fluid was established by slow strain rate tensile (SSRT) testing using smooth specimens under different electrochemical conditions for understanding the mechanism of SCC. However, to assess the life of the implant devices that often possess fine micro-cracks, SCC susceptibility of notched specimens was investigated by circumferential notch tensile (CNT) testing. CNT tests also produced important design data, i.e. threshold stress intensity for SCC (KISCC) and SCC crack growth rate. Fractographic features of SCC were examined using scanning electron microscopy. The SSRT and CNT results, together with fractographic evidence, confirmed the SCC susceptibility of both smooth and notched specimens of a magnesium alloy in the physiological environment.
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Affiliation(s)
- Lokesh Choudhary
- Department of Mechanical & Aerospace Engineering, Monash University, Melbourne, VIC-3800, Australia
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Prokopowicz M, Zegliński J, Gandhi A, Sawicki W, Tofail SAM. Bioactive silica-based drug delivery systems containing doxorubicin hydrochloride: in vitro studies. Colloids Surf B Biointerfaces 2012; 93:249-59. [PMID: 22325320 DOI: 10.1016/j.colsurfb.2012.01.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 12/16/2011] [Accepted: 01/16/2012] [Indexed: 11/17/2022]
Abstract
This study reports the applicability of sol-gel derived silica and silica-polydimethylsiloxane (silica-PDMS) composites as a potential bioactive implantable drug delivery system for doxorubicin hydrochloride (DOX). These composites also contain calcium chloride (CaCl(2)) and triethylphosphate as precursors of Ca(2+) and (PO(4))(3-) ions. These composites were immersed for 20 days in a simulated body fluid (SBF) at 37°C to study the release rate of the DOX, dissolution of the silica and the formation of hydroxyapatite on the composites' surface. The results show that the release rate of the DOX can be effectively tailored by either the addition of a polydimethylsiloxane (PDMS), or by varying the amount of CaCl(2), where the elution rate of DOX increases with increasing amount of the CaCl(2) precursor. Importantly, irrespective of the amount of CaCl(2), no burst release of DOX has been observed in any of the silica-PDMS system investigated. On the other hand, a slow release of DOX has been observed with a trend that followed a zero (0)-order kinetics for a total of 20 days of elusion. The dissolution of silica in SBF was ca. two-times faster than that of silica-PDMS, with the former reaching an average saturation level of 80 μg/mL whilst the latter reached 46 μg/mL within 20 days. Both the silica and the silica-PDMS composites show bioactivity i.e. they absorb calcium phosphate from SBF. Within 10 days, a ten-fold increase in the concentration of calcium phosphate deposit has been observed on the silica-PDMS relative to the silica. The constant rates of DOX release observed for the silica-PDMS composites indicate that the calcium phosphate deposit do not obstruct controlled release of the drug.
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Fahlgren A, Johansson L, Edlund U, Aspenberg P. Direct ex vivo measurement of the fluid permeability of loose scar tissue. Acta Bioeng Biomech 2012; 14:47-51. [PMID: 22793501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Fluid flow is important in many biomechanical models, but there is a lack of experimental data that quantifies soft tissue permeability. We measured the tissue permeability in fibrous soft tissue, using a novel technique to obtain specimens by allowing soft tissue to grow into coralline hydroxyapatite scaffoldings implanted between the abdominal muscle layers of rats.
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Affiliation(s)
- Anna Fahlgren
- Department of Clinical and Experimental Medicine, Sweden
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Demkowska I, Polkowska Z, Namieśnik J. Non-invasive biological fluid matrices analysed to assess exposure to environmental tobacco smoke. J Expo Sci Environ Epidemiol 2011; 21:656-661. [PMID: 21559054 DOI: 10.1038/jes.2011.19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2010] [Accepted: 11/28/2010] [Indexed: 05/30/2023]
Abstract
Human biomonitoring (analysis of biological fluids) is increasingly being used for assessing exposure to environmental pollutants. Smoking tobacco is a significant source of indoor air pollution and is harmful to human health. The aim of this research was to find both the best non-invasive matrices (from among saliva, urine, semen and sweat) for evaluating environmental exposure to tobacco smoke and the relationships between thiocyanates (biomarkers of environmental tobacco smoke exposure) and other inorganic ions in these matrices collected from active and passive smokers and also non-smokers.
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Affiliation(s)
- Ilona Demkowska
- Department of Analytical Chemistry, Chemical Faculty, Gdansk University of Technology, G. Narutowicza Street. 11/12, 80-233 Gdañsk, Poland.
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Kamenicky P, Blanchard A, Frank M, Salenave S, Letierce A, Azizi M, Lombès M, Chanson P. Body fluid expansion in acromegaly is related to enhanced epithelial sodium channel (ENaC) activity. J Clin Endocrinol Metab 2011; 96:2127-35. [PMID: 21508131 DOI: 10.1210/jc.2011-0078] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Soft-tissue swelling and increased extracellular volume, two features of acromegaly, are related to the antinatriuretic effects of excess GH/IGF-I, but the precise pathophysiological mechanism is unclear. OBJECTIVE Our objective was to determine the effect of the GH excess on renal and extrarenal epithelial sodium channel (ENaC) activity. DESIGN AND SETTING We conducted a prospective randomized open-label blinded-endpoint (PROBE) crossover study (www.ClinicalTrials.gov Identifier: NCT00531908) at a tertiary referral medical center and clinical investigation center. INTERVENTION Sixteen patients (five females, 11 males) with acromegaly were randomly assigned to receive 20 mg amiloride (an ENaC blocker) and 25 mg furosemide (a Na-K-2Cl cotransporter blocker) under a high-sodium diet to suppress endogenous renin and aldosterone. MEASUREMENTS Diuretic-induced changes in the urinary Na/K ratio (reflecting coupling between ENaC-mediated Na reabsorption and distal K secretion) and the intranasal amiloride-sensitive potential (reflecting extrarenal ENaC activity) were measured before and 6 months after (range, 1-12 months) treatment of acromegaly. RESULTS Serum IGF-I concentrations normalized in all the patients after treatment of acromegaly. Baseline plasma renin and aldosterone concentrations remained unchanged after treatment. Active acromegaly, compared with controlled disease, was associated with an enhanced response [median (interquartile range)] to amiloride [urinary Na/K, 13.9 (9.8-19.5) vs. 6.3 (4.3-8.4) mmol/mmol, P = 0.0003], a reduced response to furosemide [urinary Na/K, 5.2 (4.6-7.2) vs. 7.1 (5.4-8.8) mmol/mmol, P =0.0151], and an increased intranasal amiloride-sensitive potential [5.8 (11.9-3.8) vs. 4.2 (6.4-2.1) mV, P = 0.031], respectively. CONCLUSION GH/IGF-I excess in humans is associated with enhanced renal and extrarenal ENaC activity that may contribute to soft-tissue swelling and volume expansion in acromegaly.
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Affiliation(s)
- Peter Kamenicky
- Assistance Publique-Hôpitaux de Paris, Hôpital de Bicêtre, Service d'Endocrinologie et des Maladies de la Reproduction, Le Kremlin Bicêtre F-94275, France
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Wu G, Li X, Fan X, Wu H, Wang S, Shen Z, Xi T. The activity of antimicrobial peptide S-thanatin is independent on multidrug-resistant spectrum of bacteria. Peptides 2011; 32:1139-45. [PMID: 21453736 DOI: 10.1016/j.peptides.2011.03.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 03/17/2011] [Accepted: 03/17/2011] [Indexed: 11/21/2022]
Abstract
In this study, the activity of S-thanatin (an analog of antimicrobial peptide derived from thanatin) against different bacterial pathogens frequently which can cause therapeutic problems was tested. The result showed minimal inhibitory concentrations (MICs) of S-thanatin against all isolates of the Escherichia coli, Klebsiella pneumoniae, Enterobacter cloacae, Enterobacter aerogenes, Klebsiella ornithinolytica and Klebsiella oxytoca were in the range of 4-16μg/ml, no matter which antibiotic the bacterial was resistant or susceptible, while almost all MICs to Gram-positive bacterial were >128μg/ml except Enterococcus faecium. S-thanatin was more effective toward Gram-negative strains, especially for Enterobacter and Klebsiella. The MICs of S-thanatin were no significantly different in the same species regardless of antibiotic sensitive or -resistant isolates to single or multiple antibiotic (P>0.05). Likewise, no notable difference could be observed between E. coli, K. pneumoniae, E. cloacae, E. aerogenes, K. ornithinolytica which were sensitive to S-thanatin (P>0.05). It was implied that the antimicrobial activity of S-thanatin was independent on multi-drug resistance spectrum of bacteria.
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Affiliation(s)
- Guoqiu Wu
- Center of Clinical Laboratory Medicine of Zhongda Hospital, Southeast University, Nanjing 210009, China.
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Wu C, Zhang Y, Zhou Y, Fan W, Xiao Y. A comparative study of mesoporous glass/silk and non-mesoporous glass/silk scaffolds: physiochemistry and in vivo osteogenesis. Acta Biomater 2011; 7:2229-36. [PMID: 21185954 DOI: 10.1016/j.actbio.2010.12.019] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Revised: 12/14/2010] [Accepted: 12/20/2010] [Indexed: 12/24/2022]
Abstract
Mesoporous bioactive glass (MBG) is a new class of biomaterials with a well-ordered nanochannel structure, whose in vitro bioactivity is far superior than that of non-mesoporous bioactive glass (BG); the material's in vivo osteogenic properties are, however, yet to be assessed. Porous silk scaffolds have been used for bone tissue engineering, but this material's osteoconductivity is far from optimal. The aims of this study were to incorporate MBG into silk scaffolds in order to improve their osteoconductivity and then to compare the effect of MBG and BG on the in vivo osteogenesis of silk scaffolds. MBG/silk and BG/silk scaffolds with a highly porous structure were prepared by a freeze-drying method. The mechanical strength, in vitro apatite mineralization, silicon ion release and pH stability of the composite scaffolds were assessed. The scaffolds were implanted into calvarial defects in SCID mice and the degree of in vivo osteogenesis was evaluated by microcomputed tomography (μCT), hematoxylin and eosin (H&E) and immunohistochemistry (type I collagen) analyses. The results showed that MBG/silk scaffolds have better physiochemical properties (mechanical strength, in vitro apatite mineralization, Si ion release and pH stability) compared to BG/silk scaffolds. MBG and BG both improved the in vivo osteogenesis of silk scaffolds. μCT and H&E analyses showed that MBG/silk scaffolds induced a slightly higher rate of new bone formation in the defects than did BG/silk scaffolds and immunohistochemical analysis showed greater synthesis of type I collagen in MBG/silk scaffolds compared to BG/silk scaffolds.
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Affiliation(s)
- Chengtie Wu
- Institute of Health & Biomedical Innovation, Queensland University of Technology, Brisbane, Australia
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Xin Y, Hu T, Chu PK. In vitro studies of biomedical magnesium alloys in a simulated physiological environment: a review. Acta Biomater 2011; 7:1452-9. [PMID: 21145436 DOI: 10.1016/j.actbio.2010.12.004] [Citation(s) in RCA: 220] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 12/01/2010] [Accepted: 12/03/2010] [Indexed: 11/15/2022]
Abstract
In spite of the immense potential of biodegradable magnesium alloys, the fast degradation rates of Mg-based biomedical implants in the physiological environment impose severe limitations in many clinical applications. Consequently, extensive in vitro studies have been carried out to investigate the materials' performance and fathom the associated mechanisms. Here, an up-to-date review of the in vitro studies on biomedical magnesium alloys in a simulated physiological environment is provided. This review focuses on four topics: (1) materials selection and in vitro biocompatibility of biomedical magnesium alloys; (2) in vitro degradation of biomedical magnesium alloys in simulated physiological environments, specifically discussing corrosion types, degradation rates, corrosion products and impact of the constituents in body fluids on materials degradation; (3) selection of suitable test media for in vitro assessment; and (4) future research trends.
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Affiliation(s)
- Y Xin
- School of Materials Science and Engineering, Chongqing University, Chongqing, China.
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Squadrito GL, Postlethwait EM, Matalon S. Elucidating mechanisms of chlorine toxicity: reaction kinetics, thermodynamics, and physiological implications. Am J Physiol Lung Cell Mol Physiol 2010; 299:L289-300. [PMID: 20525917 PMCID: PMC2951076 DOI: 10.1152/ajplung.00077.2010] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2010] [Accepted: 06/02/2010] [Indexed: 12/18/2022] Open
Abstract
Industrial and transport accidents, accidental releases during recreational swimming pool water treatment, household accidents due to mixing bleach with acidic cleaners, and, in recent years, usage of chlorine during war and in acts of terror, all contribute to the general and elevated state of alert with regard to chlorine gas. We here describe chemical and physical properties of Cl(2) that are relevant to its chemical reactivity with biological molecules, including water-soluble small-molecular-weight antioxidants, amino acid residues in proteins, and amino-phospholipids such as phosphatidylethanolamine and phosphatidylserine that are present in the lining fluid layers covering the airways and alveolar spaces. We further conduct a Cl(2) penetration analysis to assess how far Cl(2) can penetrate the surface of the lung before it reacts with water or biological substrate molecules. Our results strongly suggest that Cl(2) will predominantly react directly with biological molecules in the lung epithelial lining fluid, such as low-molecular-weight antioxidants, and that the hydrolysis of Cl(2) to HOCl (and HCl) can be important only when these biological molecules have been depleted by direct chemical reaction with Cl(2). The results from this theoretical analysis are then used for the assessment of the potential benefits of adjuvant antioxidant therapy in the mitigation of lung injury due to inhalation of Cl(2) and are compared with recent experimental results.
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Affiliation(s)
- Giuseppe L Squadrito
- Department of Environmental Health Sciences, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama 35294-0022, USA.
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Vasilescu E, Drob P, Raducanu D, Cojocaru VD, Cinca I, Iordachescu D, Ion R, Popa M, Vasilescu C. In vitro biocompatibility and corrosion resistance of a new implant titanium base alloy. J Mater Sci Mater Med 2010; 21:1959-1968. [PMID: 20336353 DOI: 10.1007/s10856-010-4057-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Accepted: 03/11/2010] [Indexed: 05/29/2023]
Abstract
One objective of this work was to study the corrosion resistance of the new implant Ti-10Zr-5Ta-5Nb alloy in physiological fluids of different pH values, simulating the extreme functional conditions. Another objective was in vitro biocompatibility evaluation of the new alloy using human fetal osteoblast cell line hFOB 1.19. Cytocompatibility was assessed by determination of possible material cytotoxic effects, cell morphology and cell adhesion. The thermo-mechanical processing of the new implant alloy consisted in plastic deformation (almost 90%) performed by hot rolling accompanied by an initial and final heat treatment. The new Ti-10Zr-5Ta-5Nb alloy presented self-passivation, with a large passive potential range and low passive current densities, namely, a very good anticorrosive resistance in Ringer solution of acid, neutral and alkaline pH values. Cell viability was not affected by the alloy substrate presence and a very good compatibility was noticed.
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Affiliation(s)
- E Vasilescu
- Institute of Physical Chemistry "Ilie Murgulescu", Spl. Independentei 202, Bucharest 060021, Romania.
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Li NJ, Li W, He P, Gu X, Li SQ. Effect of beta3-adrenergic agonists on alveolar fluid clearance in hypoxic rat lungs. Chin Med J (Engl) 2010; 123:1028-1033. [PMID: 20497709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023] Open
Abstract
BACKGROUND Recent research suggests that beta(2)-adrenergic agonists increase alveolar fluid clearance (AFC) under physiologic and pathologic conditions. It is unknown whether beta(3)-adrenergic agonists also increase AFC under pathologic conditions. The aim of this study was to investigate the effect of beta(3)-adrenergic agonists on AFC following hypoxic lung injury and the mechanisms involved. METHODS Hypoxic rats were exposed to 10% oxygen. BRL-37344 (beta(3)-adrenergic agonist) or CGP-12177 (selective beta(3)-adrenergic agonist) alone or combined with beta receptor antagonists, sodium channel blockers, or Na(+)/K(+)-ATPase blockers were perfused into the alveolar space of rats exposed to 10% oxygen for 48 hours. Total lung water content (TLW) and AFC were measured. RESULTS AFC did not change for the first 24 hours but then decreased after 48-hour exposure to 10% oxygen. The perfusion of BRL-37344 or CGP-12177 significantly increased AFC in normal and hypoxic rats. The AFC-stimulating effect of CGP-12177 was lowered with amiloride (a Na(+) channel blocker) and ouabain (a Na(+)/K(+)-ATPase inhibitor) by 37% and 49%, respectively. Colchicine significantly inhibited the effect of CGP-12177. CONCLUSIONS These findings suggest that beta(3)-adrenergic agonists can increase AFC during hypoxic lung injury in rats and accelerate the amelioration of pulmonary edema.
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Affiliation(s)
- Nai-jing Li
- Department of Gerontology, Shengjing Hospital, China Medical University, Shenyang, Liaoning, China
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Li R, Maminishkis A, Banzon T, Wan Q, Jalickee S, Chen S, Miller SS. IFN{gamma} regulates retinal pigment epithelial fluid transport. Am J Physiol Cell Physiol 2009; 297:C1452-65. [PMID: 19794146 PMCID: PMC2793058 DOI: 10.1152/ajpcell.00255.2009] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Accepted: 09/25/2009] [Indexed: 12/14/2022]
Abstract
The present experiments show that IFNgamma receptors are mainly localized to the basolateral membrane of human retinal pigment epithelium (RPE). Activation of these receptors in primary cultures of human fetal RPE inhibited cell proliferation and migration, decreased RPE mitochondrial membrane potential, altered transepithelial potential and resistance, and significantly increased transepithelial fluid absorption. These effects are mediated through JAK-STAT and p38 MAPK signaling pathways. Second messenger signaling through cAMP-PKA pathway- and interferon regulatory factor-1-dependent production of nitric oxide/cGMP stimulated the CFTR at the basolateral membrane and increased transepithelial fluid absorption. In vivo experiments using a rat model of retinal reattachment showed that IFNgamma applied to the anterior surface of the eye can remove extra fluid deposited in the extracellular or subretinal space between the retinal photoreceptors and RPE. Removal of this extra fluid was blocked by a combination of PKA and JAK-STAT pathway inhibitors injected into the subretinal space. These results demonstrate a protective role for IFNgamma in regulating retinal hydration across the outer blood-retinal barrier in inflammatory disease processes and provide the basis for possible therapeutic interventions.
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Affiliation(s)
- Rong Li
- NIH, Bethesda, MD 20892-2510, USA
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Abstract
OBJECTIVES The aim of this paper is to study the influence of albumin content, from 5 to 45 g/L, on copper dissolution and compounds composition in a simulated uterine solution. METHODS Experiments were performed in atmospheric pressure conditions and with an additional oxygen pressure of 0.2 atmospheres, at 6.3 and 8.0 pH values, and at a temperature of 37 +/- 0.1 degrees C for 1, 3, 7, and 30 days experimentation time. RESULTS The copper dissolution rate has been determined using absorbance measurements, finding the highest value for pH 8.0, 35 g/L albumin, and with an additional oxygen pressure of 0.2 atmospheres: 674 microg/day for 1 day, and 301 microg/day for 30 days. X-ray photoelectron spectroscopy (XPS) results show copper(II) as the main copper oxidation state at pH 8.0; and copper(I) and metallic copper at pH 6.3. CONCLUSIONS The presence of albumin up to 35 g/L, accelerates copper dissolution. For high albumin content a stabilisation on the copper dissolution takes place. Corrosion product layer morphology is poorly protective, showing paths through which copper ions can release.
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Affiliation(s)
- D M Bastidas
- School of Chemistry, University of St. Andrews, Fife, Scotland, UK
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Böttger SA, McClintock JB. The effects of chronic inorganic and organic phosphate exposure on bactericidal activity of the coelomic fluid of the sea urchin Lytechinus variegatus (Lamarck) (Echinodermata: Echinoidea). Comp Biochem Physiol C Toxicol Pharmacol 2009; 150:39-44. [PMID: 19444992 DOI: 10.1016/j.cbpc.2009.02.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The sea urchin Lytechinus variegatus can survive chronic exposure to sodium phosphate (inorganic phosphate) concentrations as high as 3.2 mg L-1, and triethyl phosphate (organic phosphate) concentrations of 1000 mg L-1. However, chronic exposure to low (0.8 mg L-1 inorganic and 10 mg L-1 organic phosphate), medium (1.6 mg L-1 inorganic and 100 mg L-1 organic phosphate) or high (3.2 mg L-1 inorganic and 1000 mg L-1 organic phosphate) sublethal concentrations of these phosphates inhibit bactericidal clearance of the marine bacterium Vibrio sp. Bacteria were exposed to coelomic fluid collected from individuals maintained in either artificial seawater, or three concentrations of either inorganic phosphate or organic phosphate. Sterile marine broth, natural seawater and cell free coelomic fluid (cfCF) were employed as controls. Bacterial survival indices were measured at 0, 24 and 48 h periods once a week for four weeks. Bacteria were readily eliminated from the whole coelomic fluid (wCF) of individuals maintained in artificial seawater. Individuals maintained in inorganic phosphates were able to clear bacteria following a two week exposure period, while individuals maintained at even low concentrations of organic phosphates failed to clear all bacteria from their coelomic fluid. Exposure to phosphates represses antimicrobial defenses and may ultimately compromise survival of L. variegatus in the nearshore environment.
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Affiliation(s)
- S Anne Böttger
- Department of Biology, West Chester University, West Chester, PA 19383, USA.
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RISSEL E, SCHNACK H, STEFENELLI N, WEWALKA F. Die Wirkungen von Hydrochlorothiazid auf den Wasser- und Elektrolytstoffwechsel bei Leberzirrhosen. Dtsch Med Wochenschr 2009; 84:1221-5. [PMID: 13671961 DOI: 10.1055/s-0028-1114425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
The antihypertensive effect of diuretics is well documented. At least some preserved kidney function seems to be necessary to achieve a demonstrable effect. The importance of fluid volume reduction for the antihypertensive effect of these drugs during long-term treatment is however uncertain. The effects on central hemodynamics vary according to the literature, but the blood pressure reduction in responders (delta MAP greater than 10%) may primarily be explained by a reduction of the total peripheral vascular resistance. The peripheral circulation is influenced in the same way. Sometimes a flow reduction is observed, and sometimes a resistance reduction. In spite of a lasting blood pressure reduction after treatment with diuretics, the structural hypertensive vascular changes do not seem to be influenced.
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