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| 1 | Subcellular spatial resolution achieved for deep-brain imaging in vivo using a minimally invasive multimode fiber显示文摘Achieving intravital optical imaging with diffraction-limited spatial resolution of deep-brain structures represents an important step toward the goal of understanding the mammalian central nervous system1–4.Advances in wavefrontshaping methods and computational power have recently allowed for a novel approach to high-resolution imaging,utilizing deterministic light propagation through optically complex media and,of particular importance for this work,multimode optical fibers(MMFs)5–7.We report a compact and highly optimized approach for minimally invasive in vivo brain imaging applications.The volume of tissue lesion was reduced by more than 100-fold,while preserving diffraction-limited imaging performance utilizing wavefront control of light propagation through a single 50-μm-core MMF.Here,we demonstrated high-resolution fluorescence imaging of subcellular neuronal structures,dendrites and synaptic specializations,in deep-brain regions of living mice,as well as monitored stimulus-driven functional Ca2+responses.These results represent a major breakthrough in the compromise between high-resolution imaging and tissue damage,heralding new possibilities for deep-brain imaging in vivo. | Sebastian A.Vasquez-Lopez Raphaël Turcotte Vadim Koren Martin Plöschner Zahid Padamsey Martin J.Booth TomášČižmár Nigel J.Emptage | 2018 | Light(Science & Applications)2018，7，1： | 4 |
| 2 | Risk factors and urinary biomarkers of non-albuminuric and albuminuric chronic kidney disease in patients with type 2 diabetes显示文摘BACKGROUND A number of recent studies indicate a transformation in the natural course of chronic kidney disease(CKD)in type 2 diabetes(T2D)patients:an increasing prevalence of declined renal function without proceeding to the accompanying elevation of albuminuria.It has been suggested that albuminuric and nonalbuminuric CKD patterns could be different in their phenotypes and pathogenic mechanisms.AIM To identify the risk factors and biomarkers of albuminuric and non-albuminuric patterns of CKD in patients with T2D.METHODS Three hundred sixty patients with T2D duration≥10 years were included in this observational cross-sectional study.The associations of a panel of demographic and clinical characteristics,complications,comorbidities,and metabolic and hematology parameters with albuminuric and non-albuminuric CKD patterns were analyzed.The urinary excretion of nephrin and podocin,two podocytespecific markers,and WAP-four-disulfide core domain protein 2(WFDC-2),a marker of tubulointerstitial fibrosis,was determined by ELISA in comparison with healthy controls.RESULTS Non-albuminuric CKD was associated with age≥65 years(P=0.0001),female sex(P=0.04),diabetes duration≥15 years(P=0.0009),and the use of diuretics(P=0.0005).Male sex(P=0.01),smoking(P=0.01),waist-to-hip ratio>1.0(P=0.01)and hemoglobin A1c(HbA1c)>8.0%(P=0.005)were risk factors for elevated albuminuria not accompanied by a decrease in estimated glomerular filtration rate(eGFR).Duration of diabetes≥15 years and the use of calcium channel blockers were risk factors for albuminuria with decreased eGFR(both P=0.01).In multivariate logistic regression analysis,age,HbA1c,female sex and diuretics were significant predictors for reduced eGFR,while waist-to-hip ratio,HbA1c and male sex were associated with elevated urinary albumin-to-creatinine ratio(UACR).Excretion of nephrin and podocin was increased in patients with albuminuria,regardless of decline in renal function(P<0.001),correlating positively with UACR.The urinary excretion of WFDC-2 was markedly higher in men than in women(P<0.000001).Men with T2D demonstrated increased WFDC-2 levels independently of the CKD pattern(all P<0.05).In T2D women,WFDC-2 excretion was increased in those with reduced renal function(P≤0.01),correlating negatively with eGFR.CONCLUSION The data provide further evidence that albuminuric and non-albuminuric CKD phenotypes correspond to different pathways of diabetic kidney disease progression. | Anton I Korbut Vadim V Klimontov Ilya V Vinogradov Vyacheslav V Romanov | 2019 | World Journal of Diabetes2019，10，11： | 3 |
| 3 | Linagliptin alleviates fatty liver disease in diabetic db/db mice显示文摘AIM To study the effects of linagliptin on the structural signs of non-alcoholic fatty liver disease(NAFLD) in db/db mice. METHODS Male diabetic db /db mice(BKS.Cg-Dock7m+/+Leprdb/J) aged 10 wk received the dipeptidyl peptidase 4(DPP4) inhibitor linagliptin(10 mg/kg) or saline as a placebo once per day by gavage for 8 wk. Intact db/db mice served as controls. Structural changes in the liver were analyzed from light and electron microscopic images of sections from intact, placebo-treated and linagliptin-treated animals. We estimated the changes in hepatocytes, sinusoidal cells, liver microvasculature and lymphatic roots. Hepatic staining for lymphatic vessel endothelial hyaluronan receptor-1(LYVE-1) was assessed by immunohistochemistry. RESULTS In 18-wk-old diabetic mice, liver steatosis(predominantly microvesicular and mediovesicular steatosis) was accompanied by dilation of the roots of the lymphatic system, interlobular blood vessels and bile canaliculi. Compared to saline-treated mice, linagliptin-treated mice exhibited a reduction in the mean numeral densities of hepatocytes with lipid droplets(92.4% ± 1.7% vs 64.9% ± 5.8% per field of view, P = 0.0002) and a lower proportion of hepatocytes with a high density of lipid droplets(20.7% ± 3.6% vs 50.4% ± 3.1%, P = 0.0007). We observed heterogeneous hepatocytes and relatively preserved cell structures in the linagliptin group. Dilation of blood and lymphatic vessels, as well as ultrastructural changes in the hepatocyte endoplasmic reticulum and mitochondria, were alleviated by linagliptin treatment. In intact and placebo-treated mice, immunohistochemical staining for LYVE-1 was observed in the endothelial cells of interlobular lymphatic vessels and on the membranes of some endothelial sinusoidal cells. We observed an enlarged LYVE-1 reaction area in linagliptin-treated mice compared to intact and placebo-treated mice. The improvement in the structural parameters of the liver in linagliptin-treated mice was independent to changes in the plasma glucose levels. CONCLUSION The DPP4 inhibitor linagliptin alleviates liver steatosis and structural changes in the hepatic microvasculature and lymphatic roots in a model of NAFLD in diabetic db/db mice. | Svetlana V Michurina Irina Ju Ishenko Vadim V Klimontov Sergey A Archipov Natalia E Myakina Marina A Cherepanova Eugenii L Zavjalov Galina V Koncevaya Vladimir I Konenkov | 2016 | World Journal of Diabetes2016，7，19： | 2 |
| 4 | Empagliflozin alleviates podocytopathy and enhances glomerular nephrin expression in db/db diabetic mice显示文摘BACKGROUND Modern guidelines recommend sodium-glucose cotransporter-2(SGLT2)inhibitors as the preferred antihyperglycemic agents for patients with type 2 diabetes and chronic kidney disease.However,the mechanisms underlying the renal protective effect of SGLT2 inhibitors are not fully understood.structure of podocytes and nephrin expression in glomeruli in db/db diabetic mice.METHODS We treated 8-wk-old male db/db mice with EMPA(10 mg/kg/d)or vehicle for 8 wk.Age-matched male db/+mice were included as non-diabetic controls.Parameters of body composition,glycemic and lipid control,and plasma concentrations of leptin,insulin and glucagon were assessed.We evaluated renal hypertrophy as kidney weight adjusted to lean mass,renal function as plasma levels of creatinine,and albuminuria as the urinary albumin-to-creatinine ratio(UACR).Renal structures were studied by light and transmission electron microscopy with a focus on mesangial volume and podocyte structure,respectively.Glomerular nephrin and transforming growth factor beta(TGF-β)were assessed by immunohistochemistry.RESULTS Severe obesity and hyperglycemia developed in db/db mice prior to the start of the experiment;increased plasma concentrations of fructosamine,glycated albumin,cholesterol,leptin,and insulin,and elevated UACR were detected.Mesangial expansion,glomerular basement membrane thickening,and increased area of TGF-βstaining in glomeruli were revealed in vehicle-treated mice.Podocytopathy was manifested by effacement of foot processes;nephrin-positive areas in glomeruli were reduced.EMPA decreased the levels of glucose,fructosamine and glycated albumin,UACR,kidney hypertrophy,mesangial expansion,glomerular basement membrane thickening,and glomerular TGF-βstaining,alleviated podocytopathy and restored glomerular staining of nephrin.CONCLUSION These data indicate that EMPA attenuates podocytopathy in experimental diabetic kidney disease.The anti-albuminuric effect of EMPA could be attributed to mitigation of podocyte injury and enhancement of nephrin expression. | Vadim V Klimontov Anton I Korbut Iuliia S Taskaeva Nataliya P Bgatova Maksim V Dashkin Nikolai BOrlov Anna S Khotskina Evgenii L Zavyalov Thomas Klein | 2020 | World Journal of Diabetes2020，11，12： | 2 |
| 5 | A Control Engineer's Guide to Sliding Mode Control 显示文摘 | K David Young Vadim I Utkin U' mit O' zgu'ner | 1999 | IEEE Transactions on Control Systems Technology (S1063-6536)1999，7，3： | 1 |
| 6 | Variable structure systems with sliding modes 显示文摘 | Utkin Vadim I | 1977 | IEEE Transactions on Automatic Control1977，22，2： | 1 |
| 7 | 2-D Orthotropic failure criteria for masonry显示文摘 | Vadim I Lishak Vladimir I Yagust David ZYankelevsky | 2012 | Engineering Structures2012，36，36： | 1 |
| 8 | Block control principle for mechanical systems显示文摘 | Chen De-Shiou Chang Hao-Chi Vadim I Utkin | 2000 | J of Dynamic Systems Measurement and Control2000，122，1： | 1 |
| 9 | Block Control Principle for Mechanical Systems显示文摘 | Vadim I U Chen De-Shiou Chang Hao-Chi | 2000 | Journal of Dynamic Systems Measurement and Control2000，122，1： | 1 |
| 10 | Sliding mode control design principles and applications to electric drives 显示文摘 | VADIM I U tkin | 1993 | IEEE Trans on Industrial Electronics1993，10，1： | 1 |
| 11 | Modeling of Gaussian beam diffration on volume Bragg gratings in PTR glass 显示文摘 | Ciapurin Igor V Glebov Leonid B Smimov Vadim I | 2005 | SPIE2005，5742，： | 1 |
| 12 | Block control principle for mechanical systems显示文摘 | De-Shiou Chen Hao-Chi Chang | 2000 | J of Dynamic Systems Measurement and Control2000，122，1： | 1 |
| 13 | A control engineer' s guide to sliding mode control 显示文摘 | K David Young Vadim I Utkin | 1999 | IEEE Transactions on control systems technology1999，，： | 1 |
| 14 | Complications associ- ated with technique ofpedicle screw fixation显示文摘 | Stephen I Esses Barton L Vadim Dreyzin | 1993 | Spine1993，18，15： | 1 |
| 15 | A control engineer's guide to sliding mode control显示文摘 | David K Y Vadim I U | 1999 | IEEE Transactions on Control Systems Technology1999，7，3： | 1 |
| 16 | Sliding mode control design principles and applications to electric drives显示文摘 | VADIM I U | 1993 | IEEE Transactions on Industrial electronics1993，40，1： | 1 |
| 17 | Utkin, Sliding mode control design principles and application to electric drives显示文摘 | Vadim I | 1993 | IEEE Transaction on Industrial Electronics1993，40，1： | 1 |
| 18 | Block controlprinciple for mechanical systems 显示文摘 | Vadim I Utkin De Shiou Chen Hao Chi Chang | 2000 | Journal of Dynamic Sys-tems measurement and Control2000，122，1： | 1 |
| 19 | Variable structure systems with sliding modes显示文摘 | Vadim I Utkin | 1997 | IEEE Transactions on Automatic Control1997，22，2： | 1 |
| 20 | Modeling of Gaussian beam diffraction on volume Bragg gratings in PTR glass 显示文摘 | Igor V Ciapurin Leonid B Glebov Vadim I Smimov | 2005 | SPIE2005，5742，： | 1 |
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