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M K Polano

Publications and source records attributed to M K Polano.

At least 19 recordsLinked to original sources
PubMed1986

[Dandruff].

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Hair Preparations↗
PubMed1979

Effects of glucocorticosteroids on cultured human skin fibroblasts. III. Transient inhibition of cell proliferation in the early growth stages and reduced susceptibility in later growth stages.

An immediate depression of the rate of cell proliferation occurred upon addition of glucocorticosteroids to cultures of human skin fibroblasts in the early growth stages. A reduced sensitivity or even insensitivity of the fibroblasts to growth inhibition inhibition was found upon the addition of the steroids at later stages of cell growth, when the cell density has increased. The inhibition in the early growth stages is transient and is most pronounced if the cultured medium is not renewed. This transient inhibition is not due to the development of steroid-resistant cell lines, and resembles the effect called tachyphylaxis, as is also observed in vasoconstriction tests.

Betamethasone Valerate↗
PubMed1979

Penetration of various corticosteroids through epidermis in vitro.

The penetration through the epidermis in vitro of various topically used corticosteroids was compared. The amount penetrating through the epidermis from an ethanolic solution showed good correlation with the polarity of the corticosteroids under study. Hydrocortisone, the most polar corticosteroid, penetrates the epidermis the most rapidly; clobetasone butyrate, the least polar, the slowest. Other corticosteroids, i.e., hydrocortisone-17-butyrate, triamcinolone acetonide, and clobetasol-17-propionate, form an intermediate group whose penetration rates and polarities decrease in the indicated sequence. The corticosteroid generally accepted as having greater clinical efficacy in creams or ointments did not permeate better from an ethanolic solution in vitro.

Administration, Topical↗
PubMed1979

Xanthomatosis and other clinical findings in patients with elevated levels of very low density lipoproteins.

Forty-six patients with xanthomatosis and elevated very low density lipoproteins (VLDL) levels (in different types of hyperlipoproteinaemia) were classified on the basis of the WHO criteria and the cholesterol/triglyceride ratio in VLDL. A large majority (31/46) of the patients referred to the Department of Dermatology could be classified as hyperlipoproteinaemia type III, only 8/46 as type IIB and 7/46 as type IV/V. This distinction seems to be relevant as the xanthomatous lesions differed distinctly between these three types of hyperlipoproteinaemia. Xanthochromia striata palmaris was present in 29/31 cases of hyperlipoproteinaemia type III and was not found in type IV/V patients, who had distinctive papuloeruptive xanthomas. During a follow-up in 35/46 patients all xanthomas disappeared within 2 years except the xanthelasma palpebrarum and tendinous xanthomas. All type IV/V patients (7/7) but only one type III patient (1/31) had abnormal glucose tolerance. Only 2/18 type III patients less than 45 years showed claudication and none of the young type III patients had angina pectoris. In contrast, all four type IIB patients less than 45 years had clinical signs of atherosclerosis. However, angina pectoris and/or claudication were present in 5/13 type III patients over 45 years old. The mean serum cholesterol level was equally elevated in both groups but the cholesterol was mainly present in VLDL in type III and in low density lipoproteins (LDL) in type IIB. In 9/31 type III patients the LDL level was also elevated but was easily normalized by a diet low in carbohydrate, whereas the elevated LDL level in type IIB was therapy-resistant. The recognition of xanthomatous lesions, specifically xanthochromia striata palmaris, as an early sign of type III hyperlipoproteinaemia, can lead to the early diagnosis and successful treatment of these patients, and thus possibly prevent the development of premature atherosclerosis.

Adult↗
PubMed1977

Effects of glucocorticosteroids on primary human skin fibroblasts. I. Inhibition of the proliferation of cultured primary human skin and mouse L929 fibroblasts.

Various glucocorticosteroids were added to logarithmically growing cultures of primary human skin fibroblasts and of mouse L929 fibroblasts. These steroids inhibited proliferation of the human fibroblasts at concentrations which fall in a range expected to occur during the topical treatment of skin disorders. In terms of the concentrations required for the inhibition hydrocortisone was least and clobetasol-17-propionate most effective. All other steroids studied (hydrocortisone-17-butyrate, triamcinolone acetonide, betamethasone-17-valerate and hydrocortisone-21-acetate) showed medium effectiveness. Fluorination as such may not enhance the inhibitory effect. The inhibition was independent of the source (baby foreskin or adult arm skin) and passage number (7th to 13th or 15th and 16th passage, respectively) of the cells. The possible relationship between the inhibition of cell proliferation by such steroids and their therapeutic effect in psoriasis and their atrophic side effects is discussed. Mouse L929 fibroblasts were affected at 10(3)--10(4)-fold lower steroid concentrations and the range of the effective concentrations was 10(4)--10(5) times as wide as that for the primary human skin fibroblasts. It was concluded that these mouse fibroblasts are a poor model system for the study of in vivo effects of glucocorticosteroids in man.

Administration, Topical↗
PubMed1976

Primary hyperlipoproteinemia in xanthomatosis.

Blood lipid values, clinical data and effects of therapy are reported on 74 patients with hyperlipidemia and xanthomatosis. A natural subdivision into two groups was observed on the basis of low density lipoprotein lipid values: one corresponding to Frederickson's type II, characterized by elevated low density lipoproteins, tendinous xanthomata, absence of eruptive xanthomata and a high incidence of cardiovascular diseases and the other resembling Frederickson's type III, with elevated very low density lipoproteins, eruptive xanthomata, xanthomata striata palmaria, elevated cholesterol/triglyceride ratios in the very low density lipoproteins and irregular appearance of floating beta lipoproteins. The latter group consisted of 32 patients in whom cardiovascular symptoms were relatively rare, despite mean cholesterol levels of 500 mg/dl.

Adult↗