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Biomedical subjects

J H Epstein

Publications and source records attributed to J H Epstein.

At least 73 records · Page 4Linked to original sources
PubMed1977

Photocontact dermatitis to halogenated salicylanilides and related compounds. Our experience between 1967 and 1975.

We evaluated the role of the halogenated salicylanilides and related compounds in the development of photocontact dermatitis between 1967 and 1975 as seen at the University of California, San Francisco clinic. During this period positive photopatch tests to at least one of these chemicals were detected in 98 patients. Prior to 1967, tetrachlorosalicylanilide and the brominated salicylanilides were the most common offenders. Declines occurred in number of patients with positive photopatch tests and patch tests to these agents as well as the number of patients tested to these agents during this period; ie, almost three times as many people were tested and four times as many had positive photopatch tests in the last six months of 1967 as compared to the first nine months of 1975. The most striking reduction in numbers of patients with positive tests occurred after 1968, but the most notable reduction in the total number of positive photopatch tests occurred after 1970. We concluded that these results were most likely due to removal from the market of the more potent photosensitizing chemicals and increased physician familiarity with the disease process.

Adult↗
PubMed1976

Porphyria-like cutaneous changes induced by tetracycline hydrochloride photosensitization.

Five patients manifested cutaneous changes indistinguishable from those noted in some porphyric disorders, consisting of fragility, denudation, and blister formation of sun-exposed skin. Microscopical examination showed subepidermal bulla formation and the desposition of PAS-positive, diastase-resistant material and IgG in or around the upper dermal blood vessel walls. There was also electron microscopical evidence of vascular basal lamina reduplication and the deposition of a fine fibrillar material in and around these vessels. However, no abnormal porphyrin formation was noted. All five patients had been receiving 250 mg of tetracycline hydrochloride twice a day for at least six months and had had extensive sun exposure prior to the onset of the condition. For four patients, discontinuing the medication led to complete remission, despite subsequent sun exposure; the fifth patient was much improved, but her skin was still somewhat fragile seven months later. We concluded that these cutaneous changes resulted from a low-grade photosensitization by tetracycline hydrochloride.

Acne Vulgaris↗
PubMed1970

Defect in DNA synthesis in skin of patients with xeroderma pigmentosum demonstrated in vivo.

Exposure of normal human skin in vivo to ultraviolet irradiation at wavelengths shorter than 320 nanometers stimtulated an unscheduled DNA synthesis in all of the cell layers of the epidermis and in the upper dermnial fibrocytes. The skin of patients with xeroderma pigmentosum did not show this response. correlation of these findings with previous tissue culture studies suggests that the defect in repair of the damaged DNA in xeroderma cells occurs in vivo as well as in vitro.

Autoradiography↗