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Biomedical subjects

M Avenel

Publications and source records attributed to M Avenel.

13 recordsLinked to original sources
PubMed1984

[Seasonal variations of vitamin D metabolites in man].

Studies concerning the influence of seasons and ultraviolet radiations on the metabolism of 1,25-dihydrocholecalciferol (1,25 (OH)2D), the active form of vitamin D, have given conflicting results. In the present study serum concentrations of the 3 main vitamin D metabolites--25-hydroxyvitamin D, 24,25-dihydroxyvitamin D and 1,25-dihydroxyvitamin D--were measured by radiocompetitive assay (a) monthly during one year in 7 normal subjects, and (b) before, during and after 4 weeks of "whole body" exposure to ultraviolet radiations in 11 other subjects. In study (a) parallel changes in 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D concentrations were observed during the year, with a rise in the summer; there were no significant monthly or quarterly changes in 1,25-dihydroxyvitamin D concentrations. In study (b), 25-hydroxyvitamin D and 24,25-dihydroxyvitamin D concentrations rose by 150% and 200% respectively after 4 weeks' exposure to ultraviolet radiations and again, there were no significant changes in 1,25-dihydroxyvitamin D concentrations. These results confirm that when synthesis of the substrate (25-hydroxyvitamin D) increases, synthesis of 1,25-dihydroxyvitamin D is inhibited by a regulatory process which does not apply to 24,25-dihydroxyvitamin D synthesis.

Adult↗
PubMed1984

[Kindler syndrome. Case report with ultrastructure study].

A case is reported of a 20 year-old man who had progressive poikiloderma, cutaneous atrophy, plantar keratosis, and, from birth, blister formation regressive in infancy. Ultrastructural study performed on poikilodermic and atrophic lesions showed that dermoepidermal "clefts" or " vacuolizations " observed in optical microscopy did correspond to a cleavage between lamina densa and undamaged basal cells membrane. Sixty cases of congenital poikiloderma with blisters and keratosis have been reviewed in the literature; 13 out of these, are as the present case, similar to the original observation of Th. Kindler ; the common clinical features of these cases (cutaneous atrophy, mucous membrane involvement) and probably autosomic recessive inheritance, allow to consider, according to the authors opinion, Kindler 's syndrome as a peculiar entity.

Adolescent↗
PubMed1982

[Cutaneous alternariosis revealing Cushing's disease. A case with ultrastructural study].

This case concerned a 67 old farmer who presented a vegetating and crusted tumor of the right knee. Histological examination revealed intracellular round structures PAS + within an inflammatory dermal granuloma, including epithelioid and giant cells. Alternaria could be isolated on cultures from biopsies of the tumor. Ultrastructural study specifies the morphological aspects of Alternaria within dermal granuloma; furthermore, large numerous myelinic bodies were present within the parasitic cells. The clinical aspect of the patient led to hormonal explorations and a Cushing's disease yet unrecognized was ascertained, that probably represented the "special terrain" which made the growth of Alternaria possible. The survey of the available literature revealed two cases of alternariosis and Cushing's syndrome, but in these two cases the diagnosis of the endocrinopathy was already established when the cutaneous infection developed. The lesion cleared within a month after electrocoagulation, local iodine compound and griseofulvine per os, with nonrelapse 12 months after.

Aged↗
PubMedDate not supplied

[Report on two cases of bullous manifestations, one of which being a pemphigus, induced by penicillamine (author's transl)].

Cutaneous bullous disease may be induced by D-penicillamin. We have briefly reviewed what was then possible: bullosa epidermolysis, pemphigus, bullous toxiderma. We have had the opportunity to observe twice this phenomenon. In one case, as already mentioned about fifteen times in the literature, it was a pemphigus. Its clinical, histological and immunological features are mentioned, and its good prognosis confirmed. The other case gives matter to discussion about toxic pre-pemphigus.

Drug Eruptions↗