Expression levels of vascular endothelial growth factor, matrix metalloproteinases 2 and 9 and tissue inhibitor of metalloproteinases 1 and 2 in the plasma of patients with ovarian carcinoma.

We measured the levels of the vascular endothelial growth factor (VEGF), matrix metalloproteinases type 2 and type 9 (MMP-2 and MMP-9) and tissue inhibitors of matrix metalloproteinase 1 and 2 (TIMP-1 and TIMP-2) in the plasma of patients with ovarian carcinoma (n=40), in other gynaecological pathologies (n=30) and in the plasma of healthy volunteers (n=26). MMP-2 and MMP-9 (pro and active forms) gelatinolytic activity was measured by zymography. Enzyme-linked immunosorbent assays (ELISA) were used to assay soluble VEGF and TIMPs. Preoperative plasma VEGF levels were significantly higher in patients with ovarian cancer than in healthy volunteers (P<0.0001) or patients with a benign gynaecological pathology (P<0.0001). The expression of pro-MMP-9 was higher in the plasma of ovarian cancer patients than in the plasma of women with non-malignant disease (P=0.01) or healthy women (P<0.0002). Pro-MMP-2 was detected in the plasma of ovarian cancer patients, but levels did not differ from those in non-malignant disease or healthy donor samples. Plasma TIMP-1 and TIMP-2 levels were significantly higher in patients with ovarian carcinomas than in healthy volunteers (P<0.0001 and P=0.006, respectively) or in the patients with a non-malignant pathology (P<0.0001 and P=0.002, respectively). Sub-group analysis showed that VEGF and pro-MMP-9 were higher in the plasma of patients with serous carcinomas than other histological types. Furthermore, plasma VEGF and pro-MMP-9 levels were higher in the plasma of cancer patients with thrombocytosis. Throughout the study, and in the univariate analysis, no correlation was found between the VEGF, MMP and TIMP levels. Only TIMP-1 was associated with a poor survival and mortality risk.

The spatial distribution of visual attention in developmental dyslexia.

The present study investigated the spatial distribution of visual attention in dyslexic and normally reading children. The performances of the two groups were investigated using two different paradigms. In experiment 1 we analyzed the distribution of processing resources both inside and outside the focus of visual attention by simply recording reaction times to the detection of a white dot target projected at different eccentricities from the fovea. The distribution of attentional resources differed significantly between the two groups of children. The eccentricity of the stimulus was significant only for normally reading children - who showed a normal gradient - as it influenced their detection speed, whereas it had no effect on dyslexic children, who exhibited a diffused distribution of visual processing resources inside the visual field. In experiment 2 we studied the distributed (unfocused) mode of attention in a visual search task by measuring reaction times to a target stimulus inside a large configuration with a variable number of distractors. Results show that as compared to normal children dyslexics are better able to distribute their attentional resources diffusely. Our conclusion is that reading disability may be characterized by a diffused distribution of visual processing resources. These data might be interpreted in the framework of studies on magnocellular deficits in dyslexia, whereby the anomalous distribution of visual attention might explain how transient pathway functioning influences the reading process.

Visual-spatial attention in developmental dyslexia.

Orienting and focusing of visual attention are two processes strictly involved in reading. They were studied in a group of dyslexic children and normal readers. Shifting of attention by both peripheral and central visual cues was studied by means of the covert orienting paradigm. Focusing, consisting in the ability to control the size of the attentional focus, was investigated using simple reaction times in central vision. Results showed that dyslexics had a specific disability in the shifting of attention caused by a peripheral cue at short SOAs, and were also able to maintain attention focused for short periods of time only, presumably not long enough for efficient visual processing. Our results support the suggestion that visual selective attention deficits in disabled readers may be due to a specific difficulty in orienting and focusing.

MMP inhibitors: experimental and clinical studies.

Matrix metalloproteases (MMPs) are a family of structurally related enzymes that are capable of degrading proteins of the extracellular matrix. These enzymes play a role in tissue remodelling associated with both physiological and pathogenic processes. A high expression of MMPs is associated with cancer malignancy: it is related to the tumor's ability to metastasize and to the process of angiogenesis. Treatment with MMP inhibitors alone or in combination with cytotoxic therapy is an interesting novel approach to control tumor progression. The expected mechanism of action of these compounds and the difference in side effects compared to cytotoxic drugs make the definition of endpoints and the assessment of response difficult. Furthermore, it is not yet clear whether tumor vascularization or, more specifically, MMP expression/activation should be a criterion of eligibility for this kind of treatment. This review provides an overview of the characteristics of MMPs and their role in tumor progression, metastasis and angiogenesis. Preclinical and clinical studies with synthetic MMP inhibitors are described. The presence of MMPs in biological fluids of patients and their use in prognostic evaluation and in determining the efficacy of treatment with MMP inhibitors is discussed.

Rhizomelic chondrodysplasia punctata: 16-year follow-up of a child from birth.

A boy with rhizomelic chondrodysplasia punctata, diagnosed on the laboratory evidence of a high plasma concentration of phytanic acid and a low erythrocyte concentration of plasmalogens, has been followed from birth to the age of 16 years. The clinical pattern (somatic, skeletal and neurological) tallies with published findings in this disease. Unusual findings are the associated epilepsy, confirmed by EEG, and the long survival. CT brain scan and MRI showed cortical and subcortical atrophy but not gyral abnormalities or demyelination.

[The sleep-wake rhythm of the fetus]. / Le rythme sommeil-veille du foetus.

Our work refers to a body of studies carried out by Sonargram observation, which allowed us to study fetal movements in real time. These fetuses were studied not only as parameters of correct neurobiological maturity but also from the psychological interest which looks for the beginning of thinking based on the question: When and how does the thought process begin in biological matter? The study comparing the movement of fetuses and new-born babies to psychoanalytical research (which have been described in other works) led us to formulate the following hypothesis: motor and sense experiences can only become "mental" after separation from the mother; it can only come about by birth which effectively forces a confrontation on biological grounds: it prepares the thinking process without yet having it. There is a debate between these positions and psychoanalytical schools of thought in which thinking could precede the birth of the human fetus; there might be a stage of sleep (REM) that corresponds to adult dreaming.