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1.
Hung-Yen Ke Li-Han Chin Chien-Sung Tsai Feng-Zhi Lin Yen-Hui Chen Yung-Lung Chang Shih-Ming Huang Yao-Chang Chen Chih-Yuan Lin 《Journal of cellular and molecular medicine》2020,24(6):3669-3677
Cardiovascular complications are leading causes of morbidity and mortality in patients with chronic kidney disease (CKD). CKD significantly affects cardiac calcium (Ca2+) regulation, but the underlying mechanisms are not clear. The present study investigated the modulation of Ca2+ homeostasis in CKD mice. Echocardiography revealed impaired fractional shortening (FS) and stroke volume (SV) in CKD mice. Electrocardiography showed that CKD mice exhibited longer QT interval, corrected QT (QTc) prolongation, faster spontaneous activities, shorter action potential duration (APD) and increased ventricle arrhythmogenesis, and ranolazine (10 µmol/L) blocked these effects. Conventional microelectrodes and the Fluo-3 fluorometric ratio techniques indicated that CKD ventricular cardiomyocytes exhibited higher Ca2+ decay time, Ca2+ sparks, and Ca2+ leakage but lower [Ca2+]i transients and sarcoplasmic reticulum Ca2+ contents. The CaMKII inhibitor KN93 and ranolazine (RAN; late sodium current inhibitor) reversed the deterioration in Ca2+ handling. Western blots revealed that CKD ventricles exhibited higher phosphorylated RyR2 and CaMKII and reduced phosphorylated SERCA2 and SERCA2 and the ratio of PLB-Thr17 to PLB. In conclusions, the modulation of CaMKII, PLB and late Na+ current in CKD significantly altered cardiac Ca2+ regulation and electrophysiological characteristics. These findings may apply on future clinical therapies. 相似文献
2.
Sheng-Ping Huang Chun-Hsiang Huang Jia-Fwu Shyu Herng-Sheng Lee Shyi-Gen Chen James Yi-Hsin Chan Shih-Ming Huang 《Journal of biomedical science》2013,20(1):51
Background
Wound healing is a complex biologic process that involves the integration of inflammation, mitosis, angiogenesis, synthesis, and remodeling of the extracellular matrix. However, some wounds fail to heal properly and become chronic. Although some simulated chronic wound models have been established, an efficient approach to treat chronic wounds in animal models has not been determined. The aim of this study was to develop a modified rat model simulating the chronic wounds caused by clinical radiation ulcers and examine the treatment of chronic wounds with adipose-derived stem cells.Results
Sprague–Dawley rats were irradiated with an electron beam, and wounds were created. The rats received treatment with adipose-derived stem cells (ASCs), and a wound-healing assay was performed. The wound sizes after ASC treatment for 3 weeks were significantly smaller compared with the control condition (p < 0.01). Histological observations of the wound edge and immunoblot analysis of the re-epithelialization region both indicated that the treatment with ASCs was associated with the development of new blood vessels. Cell-tracking experiments showed that ASCs were colocalized with endothelial cell markers in ulcerated tissues.Conclusions
We established a modified rat model of radiation-induced wounds and demonstrated that ASCs accelerate wound-healing. 相似文献3.
Ching-Hung Lee Yen-Wei Chen Yun-Tzu Huang Yih-Jiuan Pan Chien-Hsien Lee Shih-Ming Lin Lin-Kun Huang Yueh-Yu Lo Yu-Fen Huang Yu-Di Hsu Shih-Chung Yen Jenn-Kang Hwang Rong-Long Pan 《The Journal of membrane biology》2013,246(12):959-966
H+-translocating pyrophosphatase (H+-PPase, EC 3.6.1.1) plays an important role in acidifying vacuoles by transporting protons across membranes at the expense of pyrophosphate (PPi) hydrolysis. Vigna radiata H+-PPase (VrH+-PPase) contains 16 transmembrane helices (TMs). The hydrophobicity of TM3 is relatively lower than that of most other TMs, and the amino acids in this TM are highly conserved in plants. Furthermore, TM5 and -6, which are the core TMs involving in H+-PPase functions, are near TM3. It is thus proposed that TM3 is associated with H+-PPase activity. To address this possibility, site-directed mutagenesis was applied in this investigation to determine the role of TM3 in VrH+-PPase. Upon alanine/serine substitution, T138 and S142, whose side chains face toward the center TMs, were found to be involved in efficient proton transport. G149/S153 and G160/A164 pairs at the crucial termini of the two GxxxG-like motifs are indispensable in maintaining enzymatic activities and conformational stability. Moreover, stability in the vicinity surrounding G149 is pivotal for efficient expression. S153, M161 and A164 are critical for the K+-mediated stimulation of H+-PPase. Taken together, our results demonstrate that TM3 plays essential roles in PPi hydrolysis, proton transport, expression, and K+ stimulation of H+-PPase. 相似文献
4.
Regulation of nuclear receptor activities by two human papillomavirus type 18 oncoproteins,E6 and E7
The human papillomavirus (HPV) E6 and E7 oncoproteins are two major proteins that remain expressing in HPV-associated human cancers. The high-risk HPVs synthesize E6 and E7 oncoproteins to alter the function of cellular regulatory proteins, such as p53 and retinoblastoma gene product, respectively. In this study, we demonstrated that HPV-18 E6 and E7 proteins were able to directly interact with some nuclear receptors (NRs), such as thyroid receptor, androgen receptor, and estrogen receptor (ER), whether or not appropriate hormones were present. The functional roles of these two oncoproteins in NRs depended on the cell type (including ligand), promoter context, and NR type. These two oncoproteins regulated ER functions through ER's AF-1, AF-2, or both. Hence, our results provide new insights into the mechanisms controlling the proliferation and immortalization of HPV infected cells by these two oncoproteins mediating through their regulatory functions in NR systems. 相似文献
5.
Magnetic resonance imaging findings in the brains of rabbits infected with Angiostrongylus cantonensis: a long-term investigation 总被引:2,自引:0,他引:2
Because magnetic resonance (MRI) imaging is a superior technique in delineating pathological changes in cerebral angiostrongyliasis, it should also be an optimal imaging modality in monitoring long-term changes in the brains of animals infected with Angiostrongylus cantonensis. In this study, MRI and histological techniques were used to observe the changes in the brains of 7 rabbits infected with the third-stage larvae of A. canronensis. Changes were monitored by MRI from day 0 to day 207 postinfection (PI). Hyperintense lesions on T2-weighted MR brain images were first observed on day 22 PI and hallmarks of abnormalities were noted on day 35 PI. Hyperintensities on brain MR images remained up to day 207 PI. Histological examination from days 108 to 207 PI revealed meningeal congestion, choroid plexus inflammation, infarction, granuloma with embedded larva, gliosis, and hemorrhage in the brain tissues. These findings suggest that hosts infected with A. cantonensis may undergo pathological changes in the brain tissues for more than 200 days PI. Moreover, severe abnormalities may occur as early as the fifth week PI. 相似文献
6.
Li YC Tsai SH Chen SM Chang YM Huang TC Huang YP Chang CT Lee JA 《Biochemical and biophysical research communications》2012,423(4):832-837
Aristolochic acid, found in the Aristolochia species, causes aristolochic acid nephropathy (AAN) and can develop into renal failure. Methylglyoxal (MGO) is a highly cytotoxic compound generated from the metabolic process of glucose or fatty acids. It binds to proteins and forms N(ε)-(carboxymethyl)lysine (CML), which contributes to aging and diabetes mellitus complications. However, no relevant literature explores the relationship of MGO and CML with AAN. By injecting AA (10mg/kg BW) into C3H/He mice for 5 consecutive days, we successfully developed an AAN model and observed tubular atrophy with decreased renal function. Creatinine clearance also decreased from 10.32 ± 0.79 ml/min/kg to 2.19 ± 0.29 ml/min/kg (p<0.01). The concentration of MGO in kidney homogenates increased 12 × compared to the control group (from 18.23 ± 8.05 μg/mg of protein to 231.16 ± 17.57 μg/mg of protein, p<0.01), and CML was observed in the renal tubules of the mice by immunohistochemistry. Furthermore, compared to the control group, GSH levels decreased by 0.32 × (from 2.46 ± 0.41 μM/μg of protein to 0.78 ± 0.15 μM/μg of protein, p<0.01), whereas intra-renal antioxidant capacity decreased by 0.54×(from 6.82 ± 0.97 U to 3.71 ± 0.25 U; unit is equivalent to μM Trolox/mg of protein, p<0.01). In this study, we found that serious kidney damage induced by AA is related to an increase and accumulation of MGO and CML. 相似文献
7.
8.
Hsiao-Ling Chen Chih-Ching Yen Shih-Ming Wang Tung-Chou Tsai Zi-Lun Lai Jheng-Yue Sun Willei Lin Wu-Huei Hsu Chuan-Mu Chen 《Biometals》2014,27(5):1057-1068
This study investigated the ability of aerosolized bovine lactoferrin (bLF) to protect the lungs from injury induced by chronic hyperoxia. Female CD-1 mice were exposed to hyperoxia (FiO2 = 80 %) for 7 days to induce lung injury and fibrosis. The therapeutic effects of bLF, administered via an aerosol delivery system, on the chronic lung injury induced by this period of hyperoxia were measured by bronchoalveolar lavage, lung histology, cell apoptosis, and inflammatory cytokines in the lung tissues. After exposure to hyperoxia for 7 days, the survival of the mice was significantly decreased to 20 %. The protective effects of bLF against hyperoxia were further confirmed by significant reductions in lung edema, total cell numbers in bronchoalveolar lavage fluid, inflammatory cytokines (IL-1β and IL-6), pulmonary fibrosis, and apoptotic DNA fragmentation. The aerosolized bLF protected the mice from oxygen toxicity and increased the survival fraction to 66.7 % in the hyperoxic model. The results support the use of an aerosol therapy with bLF in intensive care units to reduce oxidative injury in patients with severe hypoxemic respiratory failure or chronic obstructive pulmonary disease. 相似文献
9.
Shih-Ming Chen Yau-Sheng Tsai Chin-Ming Wu Shuen-Kuei Liao Ling-Chia Wu Cherng-Shyang Chang Ya-Hui Liu Pei-Jane Tsai 《BMC microbiology》2010,10(1):320
Background
Collagen-like surface proteins Scl1 and Scl2 on Streptococcus pyogenes contain contiguous Gly-X-X triplet amino acid motifs, the characteristic structure of human collagen. Although the potential role of Scl1 in adhesion has been studied, the conclusions may be affected by the use of different S. pyogenes strains and their carriages of various adhesins. To explore the bona fide nature of Scl1 in adherence to human epithelial cells without the potential interference of other streptococcal surface factors, we constructed a scl1 isogenic mutant from the Scl2-defective S. pyogenes strain and a Scl1-expressed Escherichia coli. 相似文献10.
Shih-Ming Kao 《Ocean Development & International Law》2013,44(1):2-16
This article examines the National Plans of Action (NPOAs) adopted by selected States to combat illegal, unreported, and unregulated (IUU) fishing. Despite some minor differences between States’ NPOAs, the NPOAs generally are similar to what was envisioned in the International Plan of Action to Prevent, Deter, and Eliminate Illegal, Unreported, and Unregulated Fishing adopted in 2001. 相似文献