Calorimetric study of the interaction of binary DMTAP/DOTAP cationic liposomes with plasmid DNA.

Cationic liposomes have been suggested as possible agents for nonviral gene transfer. The interaction of plasmid DNA (pDNA) with dispersions of stable unilamellar cationic liposomes based on the binary lipid system 1,2-dimyristoyl-3-trimethyl-ammonium-propane (DMTAP):1,2-dioleoyl-3-trimethyl-ammonium-propane (DOTAP) has been studied by using isothermal titration calorimetry (ITC), high-precision differential scanning calorimetry (DSC), dynamic light scattering (DLS), and circular dichroism (CD). Systematic calorimetric and DLS exploration of the DMTAP:DOTAP binary system reveals that single-bilayer liposomes are stable at the 4:1 molar ratio, exhibiting the main lipid-phase transition temperature at approximately 25.

Apoptosis and hepatitis C virus infection in renal transplant recipients.

Hepatocellular injury in renal transplant recipients with hepatitis C virus (HCV) infection remains unclear. The suppressed immune response, in combination with increased viremia levels, provides a unique setting for the study of a potential HCV-induced apoptotic process. Liver biopsy specimens from 59 HCV-infected renal transplant recipients were examined histologically.

Thermal unfolding of human BRCA1 BRCT-domain variants.

Missense mutations at the BRCT domain of human BRCA1 protein have been associated with an elevated risk for hereditary breast/ovarian cancer. They have been shown to affect the binding site and they have also been proposed to affect domain stability, severely hampering the protein's tumor suppressor function. In order to assess the impact of various such mutations upon the stability and the function of the BRCT domain, heat-induced denaturation has been employed to study the thermal unfolding of variants M1775R and R1699W, which have been linked with the disease, as well as of V1833M, which has been reported for patients with a family history.

Greek BRCA1 and BRCA2 mutation spectrum: two BRCA1 mutations account for half the carriers found among high-risk breast/ovarian cancer patients.

127 Greek breast/ovarian cancer families were screened for germline BRCA1/2 mutations by dHPLC followed by direct sequencing. Our results indicated 16 and 5 breast/ovarian cancer families bearing deleterious mutations in the BRCA1 and BRCA2 genes, respectively. Two novel BRCA2 germline mutations (G4X and 3783del10) are reported here for the first time.

Correlation between increased serum sFas levels and microalbuminuria in type 1 diabetic patients.

Objective: The aim of this study was to elucidate if apoptosis dysregulation is present in type 1 diabetic patients with microalbuminuria.

Subjects And Methods: The following variables were determined in 29 type 1 diabetic patients: the duration of diabetes, soluble Fas (sFas), Bcl-2, hemoglobin A(1c) levels, glomerular filtration rate (GFR) and microalbuminuria, using the urine albumin to urine creatinine ratio (ACR). Age and gender were assessed and patients were categorized into two groups, according to their ACR: the microalbuminuric (MA) group with an ACR > or =30 mg/g, and the normoalbuminuric (NA) group with an ACR <30 mg/g.