Brigitte Bonhomme

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Multiple forms of phosphodiesterase have been reported in many tissues. Phosphodiesterase 6, a cGMP-specific phosphodiesterase, is described as a photoreceptor cell-specific phosphodiesterase. Phosphodiesterase 6 is known to play a crucial role in visual function. A novel phosphodiesterase inhibitor, GF248(More)
Trans polyunsaturated fatty acids are formed during heat treatments of vegetable oils from polyunsaturated fatty acids containing cis double bonds. After dietary intake, they are distributed in the body and are incorporated into nervous tissues including the retina. Since nervous tissues are known to be rich in n-3 fatty acids such as docosahexaenoic acid(More)
The functional consequences of vitreous hemorrhage on the retina were studied using a rabbit experimental model. The repartition of hemoglobinic iron inside the retina was assessed after the intravitreous injection of 59Fe-labeled erythrocytes. Electroretinographic studies were performed both in vivo after the intravitreous injection of labeled blood and in(More)
We investigated the capacity of Royal College of Surgeons (RCS) rat retinal pigment epithelial (RPE) cells to take up all-trans-retinol (ROL) (vitamin A) and to metabolize it into retinyl esters (RE). Cultures of RPE cells were established from RCS and control newborn rats. All-trans-ROL was delivered to the apical surface of the RPE monolayer. Retinoids(More)
Results of experiments performed on rat isolated retina indicate that platelet-activating factor (PAF) is able to inhibit the functional response of the retina electroretinogram (ERG) recorded in response to a brief light flash. In the presence of PAF, the ERG b-wave amplitude decreases according to a dose-dependent (2.10(-11) M; 2.10(-9) M; 2.10(-7) M)(More)
Erythropoietin (Epo) had been shown to have a neuroprotective effect independent from its erythropoietic properties. In this study, we tested whether Epo could protect the retina from damage induced by a long period of moderate light insult and how it protected. First, rats were injected intraperitoneally (i.p.) by human recombinant Epo at 5000 or(More)
Platelet-activating factor (PAF) has been shown to alter the trans-retinal potential recorded from light-stimulated isolated retina. In the present study, we investigated the effect of cholera and pertussis toxins on PAF-induced impairment of the electroretinogram (ERG). Administered alone, 2 x 10(-7) M PAF induced a very marked and rapid drop in the b-wave(More)
The effects of (R)PAF-acether have been tested on the isolated rat retina model. Results indicate that (R)PAF-acether inhibits the electrophysiological response (electroretinogram) elicited on isolated retina by a brief light flash. Immediately after the administration of (R)PAF-acether, an irreversible decrease of the electroretinogram b-wave amplitude is(More)
The retina is a tissue particularly rich in polyunsaturated fatty acids and thus highly sensitive to lipid peroxidation initiated by oxygenated free radicals. By recording the electroretinogram (ERG) b wave amplitude on isolated rat retina, the authors have investigated the anti-oxidant properties of Ginkgo biloba extract (EGB 761). Two groups of rats were(More)
Weanling rats were fed three diets differing in their concentrations of the cis- and trans-isomers of alpha-linolenic acid [18:3(n-3)] for 12 mo to study the long-term effects of these fatty acids on the electroretinogram (ERG). The diets contained 18:3(n-3) in its natural form at 2.0 g/100 g total fatty acids (C group), partially isomerized 18:3(n-3) [1.3(More)