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Biomedical subjects

C Ferrero

Publications and source records attributed to C Ferrero.

At least 19 recordsLinked to original sources
PubMed1997

Differential SP220K expression in renal carcinoma and oncocytoma cells.

SP220K is a newly described serine proteinase which displays guanidinobenzoatase activity in its inactive form and gelatinolytic activity in its active form. SP220K expression was studied in 20 renal clear-cell carcinomas and in a series of renal oncocytomas, a rare benign tumor derived from the kidney tubule epithelium. We provide evidence that SP220K expression, as assessed by guanidinobenzoatase activity, gelatin zymography and Western blot immunodetection, was increased markedly in cancer basolateral membranes compared to kidney cortex controls, whereas no signal was detectable in basolateral membranes from the 5 renal oncocytomas studied. Cytoplasms of carcinoma cells were immunodetected consistently, whereas no expression was seen in oncocytic cells from any of the oncocytomas studied (12/12). Endothelial cells were immunodetected in all 3 tissue types. Our data favor a potential mechanistic relationship between expression of the matrix proteinase SP220K and invasive phenotype in kidney epithelium proliferative processes.

Adenoma, Oxyphilic↗
PubMed1997

Accuracy of cholesterol measurements in Italian clinical laboratories. Joint project GISSI prevention--Italian Society of Clinical Biochemistry. SIBioC GISSI Prevenzione Group.

We report the results of an external quality assessment scheme for serum total cholesterol measurement involving about 100 Italian laboratories participating in an epidemiological study of post myocardial infarction. Two frozen human serum pools with Abell-Kendall assigned values are distributed quarterly at the laboratories (up to now seven events occurred); the obtained results are evaluated and discussed. In one exercise (# 5) duplicated measurements were repeated on three different days. Eighty-five to 98% of the laboratories obtained results within the total error limits (+/- 8.9%). But, while precision (calculated on the six replicates of exercise # 5) is good (90% of the laboratories obtained CV < 3%), inaccuracy problems are evident in every event. Indeed the mean bias from the reference method value ranged from 1.54 and 3.49% in the various events.

Analysis of Variance↗
PubMed1997

Creatinine measurement proficiency testing: assignment of matrix-adjusted ID GC-MS target values.

The results of an external quality-assessment experiment for serum creatinine measurement are described. Fifty-one laboratories performed quintuplicate analyses during three different analytical runs on six lyophilized sera and two frozen human serum pools. Isotope dilution gas chromatography-mass spectrometry (ID GC-MS) target values were assigned to all the materials. Intralaboratory within- and between-run imprecision results were very similar for all the materials tested (CV < or = 2.20% and < or = 4.70%, respectively). The overall imprecision obtained was high (CV 6.5-20.0%) because of increased interlaboratory-intermethod variability. A significant positive bias (+ 9.2-+43.7%) was found for all the materials at lower creatinine concentration. By using two human sera at different concentrations, we could calculate the constant and the proportional calibration bias displayed by each peer group. The majority of the lyophilized materials showed a behavior divergent from the frozen pools, indicating matrix-related problems. We propose a new algorithm for calculating matrix bias correction factor instrument-reagent specific for each material.

Algorithms↗
PubMed1997

Biological activity of particle exhaust emissions from light-duty diesel engines.

Whole diesel exhaust has been classified recently as a probable carcinogen, and several genotoxicity studies have found particulate exhaust to be clearly mutagenic. Moreover, genotoxicity of diesel particulate is greatly influenced by fuel nature and type of combustion. In order to obtain an effective environmental pollution control, combustion processes using alternative fuels are being analyzed presently. The goal of this study is to determine whether the installation of exhaust after treatment-devices on two light-duty, exhaust gas recirculation (EGR) valve-equipped diesel engines (1930 cc and 2500 cc) can reduce the mutagenicity associated with particles collected during U.S.A. and European driving cycles. Another interesting object was to compare the ability of alternative biodiesel and conventional diesel fuels to reduce the mutagenic activity associated with collected particles from two light duty diesel engines (both 1930 cc) during the European driving cycle. SOF mutagenicity was assayed using the Salmonella/microsome test (TA 98 and TA 100 strains, +/- S9 fraction). In the first part of our study, the highest mutagenicity was revealed by TA98 strain without enzymatic activation, suggesting a direct-acting mutagenicity prevalence in diesel particulate. The 2500 cc engine revealed twofold mutagenic activity compared with the 1930 cc engine (both EGR valve equipped), whereas an opposite result was found in particulate matter amount. The use of a noncatalytic ceramic trap produced a decrease of particle mutagenic activity in the 2500 cc car, whereas an enhancement in the 1930 cc engine was found. The catalytic converter and the electrostatic filter installed on the 2500 cc engine yielded a light particle amount and an SOF mutagenicity decrease. A greater engine stress was obtained using European driving cycles, which caused the strongest mutagenicity/km compared with the U.S.A. cycles. In the second part of the investigation, even though a small number of assays were available, exhaust emission generation by biodiesel fuel seemed to yield a smaller environmental impact than that of the referenced diesel fuel. The results point out the usefulness of mutagenicity testing in the research of both newer, more efficient automotive aftertreatment devices and less polluting fuels.

Air Pollutants↗
PubMed1992

[Arterial embolism, venous thrombosis, pulmonary embolism: a suggestive triad].

The aim of this study is to present a relatively rare case of paradoxical arterial embolism, found in a patient who was sent to us for serious pulmonary embolism. Taking into account that the foramen ovale, despite being functionally competent, remains anatomically patent in 30% of the adult population, we cannot neglect the possibility of a paradoxical embolism, in the presence of a sudden embolic limb ischemia unless heart pathology or aortic lesions can be held responsible. Furthermore it must not be forgotten that deep venous thrombosis in the lower limbs or in the pelvic plexus may go unobserved on a purely clinical evaluation.

Axillary Artery↗
PubMed1992

[Deep phlebothrombosis disclosing aortoiliac aneurysms].

The purpose of the present study is to underline the importance of the systematic search for iliocaval venous compression on the part of an aortoiliac aneurysm in the face of a clinical picture of suspected deep venous thrombosis. Early diagnosis of this syndrome, although rare in everyday experience, is of decisive importance, as is every other clinical sign of aneurysmal pathology prior to rupture. Correct, systematic diagnostic exclusion procedure, which is capable of leading to certain diagnosis in all cases is therefore necessary.

Aged↗
PubMed1989

[Reactivity of antigenic fractions obtained from Toxoplasma gondii evaluated with Western blotting].

A toxoplasma gondii antigen, has been obtained by sonication, separated by SDS gel electrophoresis system in 10% acrylamide and blotted onto nitrocellulose paper (Western Blot). The antigen has been tested against: serum samples from subjects T. gondii negative; serum samples from patients with acute Toxoplasma infection; serum samples from subjects who had serologic evidence of infection with T. gondii, but IgM negatives. IgG and IgM immune response has been evaluated. Gel stained with Coomassie Blue revealed 48 protein fractions; only twenty fractions reacted as antigen. In particular, we have observed that only one protein fraction has been recognized by IgM antibodies present in the serum of patient with acute Toxoplasma infection (with lymphoadenopathy); some protein fractions have been recognized only by IgG antibodies; some protein fractions have been recognized in the same time by IgG and IgM antibodies in the same serum sample.

Animals↗
PubMed1975

[Proceedings: Right bundle-branch block without a wide split of the 2nd sound].

In a series of 38 complete right bundle branch blocks (RBBB) (17 "idiopathic" and 21 cardiopathies), auscultation and phonocardiograms disclosed a normal split second heart sound (S2 = A2-P2 less than or equal to 0.045 sec) in 27 and a wide split S2 (A2-P2 greater than or equal to 0.06 sec) in only 11 cases. Analysis of the initial and terminal vectors constructed from ECGs recorded at 250 mm/sec shows no valid correlation between a transseptal mode of depolarization of the right ventricle and the presence of either a normal or wide split of the 2nd heart sound. A review of the mechanisms generating the 2nd sound and discussion of the additional factors which may influence the duration of A2-P2 in RBBB (start of activation, length and quality of right ventricular systole, impedance of pulmonary arterial bed, possible delay of 2nd aortic sound) explain why wide splitting of the 2nd sound in RBBB is the exception rather than the rule.

Bundle-Branch Block↗