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Biomedical subjects

G W Oertel

Publications and source records attributed to G W Oertel.

At least 19 recordsLinked to original sources
PubMed1976

Effects of exogenous dehydroepiandrosterone sulphate on various enzymes and on steroid metabolism in the guinea-pig.

Treatment of male guinea-pigs daily with an oral dose of 2 mg dehydroepiandrosterone (DHA) sulphate/100 g body weight for 2 weeks significantly reduced the glucose-6-phosphate dehydrogenase (G-6-PDH) activity of erythrocytes, liver, kidney and testis. Lactate dehydrogenase activity in plasma also decreased, but L-aspartate: 2-oxoglutarate aminotransferase (GOT) and L-alanine:2-oxoglutarate aminotransferase (GPT) activity in plasma remained unaffected. In liver and kidney, however, a significant rise in GOT and GPT was observed. A 2- to 3-7-fold increase of C19-steroids was observed in plasma, liver and kidney. In extracts of liver and kidney more than 60% of steroids were isolated from the sulphatide fraction. Only minor changes were detected in the metabolic pattern of C19-steroids, 17-hydroxysteroids prevailing in the free and sulphatide fractions, while 17-oxosteroids predominated in the sulphate and glucuronide fractions. A slight rise of cyclic AMP concentrations in liver and kidney tissue was attributed to the inhibition of phosphodiesterase by the DHA/G-6-PDH system

17-Ketosteroids↗
PubMed1975

Interaction between dehydroepiandrosterone, glucose-6-phosphate dehydrogenase, and cyclic adenosine-3',5'-monophosphate in neoplastic and normal human mammary tissue.

When total DHEA, G-6-PDH activity, and c-AMP were determined in human neoplastic mammary tissue and corresponding normal tissue the G-6-PDH activity in the former tissue greatly exceeded that found in normal tissue. On the other hand, a remarkable decrease of total DHEA and c-AMP could be detected in cancer tissue, hinting at the participation of DHEA in the intracellular regulation of G-6-PDH and c-AMP levels.

Breast↗
PubMed1975

[Family studies for detection of latent psoriatics by assay of alterations in steroid metabolism (author's transl)].

In psoriasis changes of the DHEA metabolism could be demonstrated. These genetically determined basic alterations may represent an important factor for the manifestation of psoriasis. They consist of a decreased penetration of DHEA through the cell membrane and an increased reduction of DHEA to ADIOL, leading to a reduced DHEA/ADIOL ratio. In the present investigations the question was whether the assay of these parameters may aid in the detection of latent psoriasis. For this purpose 31 members form 6 unselected families of psoriatics (8 manifested psoriatics, 18 potential psoriatics, 5 clinically and anamnestically healthy family members by marriage) as well as 6 further controls were examined. It could be shown that those changes in the DHEA metabolism, which are evident in manifested psoriatics also occur at least in part of potential psoriatics. However, both parameters investigated do not always behave the same way. Hence, from the present data a satisfactory diagnosis of latent psoriasis does not seem possible. Still, the estimation of the above parameters may aid in the attempts to define latent psoriasis. Further investigations of such families are warranted for final elucidation of this problem.

Androstenediols↗