Search results for "PATHOGENESIS"
showing 10 items of 761 documents
A CTLA4high genotype is associated with myasthenia gravis in thymoma patients
2005
Myasthenia gravis (MG) in thymoma patients depends critically on intratumorous generation and export of mature autoreactive CD4+ T cells. Why non-MG thymomas fail to produce CD4+ T cells is unknown. We studied three single-nucleotide polymorphisms of the cytotoxic T-lymphocyte–associated antigen 4(CTLA4) gene in thymoma patients, nonthymoma early-onset MG patients, and control subjects. Surprisingly, the CTLA4high genotype +49A/A, which is protective against several autoimmune diseases, exerted a prominent predisposing effect to paraneoplastic MG in thymoma patients. The unusual disease association with a CTLA4high genotype implies a unique pathogenesis of paraneoplastic MG, with high CTLA4…
Immunohistochemical analysis of vascular endothelial growth factor (VEGF) and p53 expression in pterygium from Tunisian patients.
2009
A pterygium is characterized by abnormal fibrovascular corneoconjunctival tissue. A number of investigations have attempted to elucidate this incompletely understood pathology. Since vascular endothelial growth factor (VEGF) and p53 are known to participate in tumor vascularization, our purpose was to study VEGF and p53 expression in active primary and recurrent pterygium from Tunisian patients. To this end, 15 cases of active primary pterygium and five cases of recurrent pterygium from Tunisia were studied by immunohistochemistry. Antibodies raised against VEGF and p53 were used to analyze the distribution and expression of these markers in pterygium and normal human conjunctiva were used …
Effects of a nutraceutical formulation based on the combination of antioxidants and ω-3 essential fatty acids in the expression of inflamma…
2013
Maria D Pinazo-Durán,1,* Carmen Galbis-Estrada,1,* Sheila Pons-Vázquez,1 Jorge Cantú-Dibildox,2 Carla Marco-Ramírez,1 Javier Benítez-del-Castillo21Ophthalmic Research Unit Santiago Grisolia, Department of Surgery/Ophthalmology, Faculty of Medicine, University of Valencia, Valencia, Spain; 2Department of Ophthalmology, Hospital of Jerez, Jerez de la Frontera, Spain*These authors contributed equally to this workBackground: Women, and those older than 65 years of age, are particularly susceptible to dry eye disorders (DEDs). Inflammation is clearly involved in the pathogenesis of DEDs, and there is mounting evidence on the antioxidant and …
Elevated protein carbonyl and HIF-1α levels in eyes with proliferative diabetic retinopathy.
2013
Purpose: To evaluate the role of protein carbonyls and hypoxia inducible factor-1a (HIF-1a) in diabetic eyes with proliferative diabetic retinopathy (PDR). Methods: Prospective consecutive controlled observational study was performed. Vitreous samples were collected at the start of the 3-ppp vitrectomy. Protein carbonylation analysis was performed by Western blotting with antibody against 2,4-Dinitrophenol (anti-DNP), following derivatization of protein carbonyls with 2,4 Dinitrophenylhydrazine (DNHP). Protein carbonylation was quantified by scanning densitometry analysis and relativized to the total amount of protein into the ponceau staining of membranes. Vitreous HIF-1 a was determined w…
MFAP5 Loss-of-Function Mutations Underscore the Involvement of Matrix Alteration in the Pathogenesis of Familial Thoracic Aortic Aneurysms and Dissec…
2014
Thoracic aortic aneurysm and dissection (TAAD) is an autosomal-dominant disorder with major life-threatening complications. The disease displays great genetic heterogeneity with some forms allelic to Marfan and Loeys-Dietz syndrome, and an important number of cases still remain unexplained at the molecular level. Through whole-exome sequencing of affected members in a large TAAD-affected family, we identified the c.472CT (p.Arg158(∗)) nonsense mutation in MFAP5 encoding the extracellular matrix component MAGP-2. This protein interacts with elastin fibers and the microfibrillar network. Mutation screening of 403 additional probands identified an additional missense mutation of MFAP5 (c.62GT …
Thyroid Stimulating Antibodies Are Highly Prevalent in Hashimoto's Thyroiditis and Associated Orbitopathy
2016
Thyroid-associated orbitopathy (TAO) rarely occurs in patients with Hashimoto's thyroiditis (HT).There is evidence that TSH receptor stimulating antibodies (TSAb) play a role in the pathogenesis of TAO. In this report, the prevalence of TSAb in HT patients with and without TAO was studied.This is a longitudinal observational study.The study took place in an academic joint thyroid-eye clinic.A total of 1055 subjects were included.TSAb was measured with a Food and Drug Administration-cleared bioassay that uses Chinese hamster ovary cells expressing a chimeric TSH receptor and a cAMP response element-dependent luciferase. Results of TSAb activity were reported as percentage of specimen-to-refe…
Immunoregulatory T-lymphocyte subset deficiency in newly diagnosed Type 1 (insulin-dependent) diabetes mellitus
1984
Humoral and cell-mediated disorders in Type 1 (insulin-dependent) diabetes suggest that an imbalance of immunoregulatory T-cell subsets exists. In 23 newly diagnosed (onset less than 3 months) and 21 long-standing Type 1 diabetic patients, T lymphocyte subsets were analyzed using monoclonal antibodies (OKT3, OKT4, OKT8, OKM1). The newly diagnosed patients showed a reduction with a significant difference from healthy controls in total T cells (OKT3+: 58.1 +/- 8.5% versus 70.7 +/- 8.0%), helper/inducer cells (OKT4+: 33.8 +/- 7.0% versus 47.1 +/- 8.3%), suppressor/cytotoxic cells (OKT8+: 18.5 +/- 7.3% versus 32 +/- 6.8%) and monocytes (OKM1+: 11.5 +/- 3.8% versus 19.9 +/- 5.2%) (p less than 0.…
Binding of monocytes from normolipidemic hyperglycemic patients with type 1 diabetes to endothelial cells is increased in vitro.
2009
Increased endothelial binding and emigration of monocytes play a dominant role in the pathogenesis of atherosclerosis in diabetes mellitus. Previous studies revealed that hyperlipidemia correlates with monocyte binding in vitro. The aim of this study was to characterize the monocyte-endothelial interaction of leucocytes of hyperglycemic patients with type 1 diabetes but lacking hyperlipidemia. We isolated monocytes from healthy controls and normolipidemic type 1 diabetes patients with elevated levels of HbA1c and quantified monocyte binding by an immunoilluminometric cell adhesion assay. Purity of isolated monocytes was at least 98%. Endothelial binding of monocytes from patients with type …
Esophageal dysfunction and its pathogenesis in progressive systemic sclerosis
1978
In 25 patients with progressive systemic sclerosis esophageal involvement was studied prospectively by analysing subjective symptoms and radiological and manometric criteria. In all patients abnormal motility could be demonstrated by X-ray and/or manometry: radiologically in 18 (72%), manometrically in 22 (88%) cases. Dysphagia was present only in 11 patients (44%). Six patients (24%) had no subjective symptoms in spite of severe objective esophageal abnormalities. Therefore, the absence of esophageal symptoms does not exclude advanced affliction of the esophagus. To determine the pathogenesis of esophageal dysfunction the effects of 3.5 microgram/kg carbachol and of 0.6 microgram/kg pentag…
Serum levels of type III procollagen peptide in diabetes mellitus.
1989
Serum levels of type III procollagen peptide (P-III-P) were investigated in 19 patients with type 1 (insulin-dependent) and in 48 (25 orally treated, 23 insulinized) patients with type 2 (non insulin-dependent) diabetes mellitus. Among patients with type 2 diabetes, 16 orally treated and 14 insulin-treated subjects had macrovascular complications. P-III-P levels were not correlated with the duration of diabetes and with glucose control, nor were there any significant sex and age differences in the levels. P-III-P values were significantly higher in the sera of insulin-treated non insulin-dependent diabetic patients with macroangiopathy. These high values (18.5 +/- 10.8 ng/ml) were in contra…