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Biomedical subjects

M Pibouin

Publications and source records attributed to M Pibouin.

11 recordsLinked to original sources
PubMed1990

Cutaneous interstitial fluid protein concentrations in the inflammatory syndrome: pharmacological consequences.

Concentrations of alpha 1 acid glycoprotein, albumin, transferrin, haptoglobin, immunoglobulins G, A, M and apolipoprotein B were measured in serum and suction blister fluid from a group of individuals presenting a biologically proven inflammatory syndrome, and from a control group. Protein values in suction blister fluid did not change from the 2nd to the 3rd h after the beginning of blister formation. The ratio of the concentration of proteins in blister fluid and serum did not differ significantly between the groups. However, a 25% decrease in blister fluid albumin and a 100% increase in blister fluid alpha 1 acid glycoprotein, recorded in the inflammatory group, were worth noting, since they possibly influence the tissular distribution of some protein-binding drugs. Finally, an inverse relationship was established between the blister fluid/serum concentration ratio and the respective molar mass of each protein.

Aged↗
PubMed1989

Eczematous dermatitis in relation to carbon ligamentoplasty.

Carbon biomedical devices are widely used in prosthetic surgery; their biocompatibility is excellent and cutaneous or mucosal adverse effects of carbon material remain exceptional. We describe a patient who developed an eczematous dermatitis on the right knee in the vicinity of a ligamentoplasty performed 2 months earlier. Patch testing with the carbon ligament was positive. Although the scattering of carbon material in the surrounding tissues is well known, cutaneous complications have, to our knowledge, never been reported.

Adult↗
PubMed1987

Binding of 8-methoxypsoralen to human serum proteins and red blood cells.

Serum binding of 8-methoxypsoralen (8-MOP) was studied by equilibrium dialysis. In therapeutic concentrations, 8-MOP binding in serum was high, 91.4%, and constant, indicating concentration-independent kinetics. This binding involved the two main proteins, human serum albumin and alpha 1-acid glycoprotein, in a saturable process with one class of binding sites (n) and affinity constants (Ka) of 1.295 X 10(4) mol/l and 2.115 X 10(4) mol/l, respectively. Binding to lipoproteins and gamma globulins was negligible and non-saturable in therapeutic concentrations, with nKa values of 0.35, 0.024, 0.013 and 0.0004 mumol/l for VLDL, LDL, HDL and gamma globulins, respectively. Inhibition of 8-MOP serum binding was observed with salicylic acid and indomethacin, but not with diazepam, warfarin or erythromycin. Over a range of therapeutic concentrations, the ration of 8-MOP concentration in red blood cells (RBCs) and in serum was constant at 20.3% and three times higher than would be expected if a simple diffusion of the 8-MOP plasma free fraction (fu) occurred. According to the measured and calculated parameters, simulations of 8-MOP blood binding in pathological states (hypoalbuminaemia with or without inflammation) showed variations of fu which were partially 'buffered' by RBCs. Simulation of 8-MOP protein binding at cutaneous interstitial fluid level showed that fu is approximately 30% and permitted prediction of a decrease of fu available to the epidermis in case of local or systemic inflammation. This may imply an increase in the minimum phototoxic dose relevant for PUVA and explain some cases of 'poor' responsiveness of psoriatic patients to PUVA therapy.

Binding Sites↗
PubMed1984

[Chronic urticarial eruption with arthritis, papillary edema, and meningoencephalitis of childhood onset].

The authors report on a case of chronic urticarial eruption since infancy in a man who is now 27-year-old; the association of numerous chronic symptoms, principally meningo-encephalitis, polyarthritis, hepato-spleno-adenomegaly allows the authors to compare this case to those described by Prieur and Griscelli in 1981 and 16 others cases found in literature. It appears as a "systemic disease" without biological or immunological markers; it might belong to the group of chronic normocomplementemic vasculitis.

Adult↗