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Biomedical subjects

J Lindner

Publications and source records attributed to J Lindner.

At least 109 records · Page 6Linked to original sources
PubMed1980

[The influence of a single glucocorticoid administration on the DNA and the nitrogen-content as well as on the beta-glucuronidase activity of rat skin during postnatal development (author's transl)].

In the paper presented here the following parameters on the skin of pure-bred Wistar inbred rats were investigated during the early postnatal maturation period: DNA-content (according to Burton 1956), nitrogen-content (according to Strauch 1965), beta-glucuronidase activity (according to Fishman 1974), partly also protein-content (according to Lowry 1951). At the same time, we tested if a single i.p. injection of 6-methyl-prednisolone, applied exactly at the same time of the day 24 h preceding the killing, has an influence on the above mentioned quantities in comparison to the control group (possibly dosage-dependent). In the observation period (2nd, 4th, 6th, 9th, and 14th day) a linear, statistically significant increase of the nitrogen-content could be stated on the skin. After an initial increase up to the 4th day of life the DNA-content significantly decreases during the following postnatal maturation period until the 14th day. These results could be obtained both in the control groups, and in the animals treated with different dosages of 6-methyl-prednisolone. It is of importance that these parameters (especially the cell and the DNA-content respectively) were not statistically significantly changed by pretreatment with the glucocorticoid at any day investigated. The total activity of the further tested lysosomal indicator-enzyme beta-glucuronidase increases during the postnatal maturation period up to its maximum on the 9th day of life before it decreases till the 14th day. The applied dosages of the glucucorticoid led to a general increase of the enzyme activity, which, however, was only exceptionally statistically significant. This enzyme induction could also by discussed in terms of a maturation acceleration. Dosage-dependent differences could partly be demonstrated.

Animals↗
PubMed1980

[The effect of sulfur compounds (N-acetylhomocysteine-thiolactone and penicillamine) on liver collagen metabolism in chronic thioacetamide poisoning].

The influence of N-acetyl-homocysteine-thiolactone (AHCT) and penicillamine on experimental thioacetamide (TAA)-induced liver fibrosis was investigated. TAA causes an increase in liver collagen content, which can partly be prevented by penicillamine and AHCT. This prevention is most effective, when the TAA-intoxication started earlier than the therapy with these two substances. The therapeutic effect of penicillamine is achieved by an inhibition of collagen biosynthesis and cross-linking (with an increase in the easily soluble collagen fractions). In the case of AHCT the inhibition of pathological collagen synthesis in experimental liver fibrosis cannot be explained by disturbed collagen cross-linking or increased collagen solubility. Whether collagen synthesis is inhibited and/or other influences of AHCT are present has still to be analyzed.

Acetamides↗
PubMed1980

The XX male -- report on a child and an adult.

Two XX males are described. The first patient with a typical phenotype of XX males has aplasia of the left kidney. The second one is a boy, who shows an additional chromosome translocation and also signs of the Prader-Willi syndrome.

Adult↗
PubMed1979

[Studies on DNA content of tissues and organs. 1st communication: changes in cell content of some mesenchymal and parenchymatous rat organs during development, maturation, and in part aging (determinations of DNA) (author's transl)].

In this study the cell content was analyzed by means of the DNA content of certain mesenchymal and parenchymal organs of the rat. The main aspects were the postnatal stages of development and maturation. Their correlation to aging was examined only on examples, so was their correlation to the prenatal development (on 2 examples: liver and skin). One important result of this research is that a gradual reduction in the exponential growth takes place with increasing maturation and development. The "growth by production" prevails over the "growth by division" (of cells). This is the explanation for the "relative" (= apparent) decrease in the cell content of the tissues and organs analyzed during the decisive postnatal development and maturation phases. In this period the complete differentiation of the cytoplasmic structures and of the differentiation products of the tissues and organs here analyzed occurs. This leads to a shift in their relative amounts to the disadvantage of the cell nuclei, which prevailed in the total weight of tissues and organs during the early phases of development. This concerns determinations of the DNA content related to wet weight even more than such of the DNA content related to dry weight. As already shown clearly, the different tissues and organs of the mammalian organism (here on the example of the rat) grow, mature and age differently. During growth different phases can be distinguished, too, by analysis of the DNA content which partly correlate with phases of growth which were differentiated morphologically. Determinations of DNA contents are necessary as parameters for determinations of the production metabolism (e.g. activities of enzymes, products of formation and differentiation) of the different tissues and organs during their development, maturation and aging.

Aging↗
PubMed1979

[Studies on DNA content of tissues and organs. 2nd communication: findings on DNA content in various rat organs 1. during maturation and aging and 2. during experimental pathological models and their therapy (author's transl)].

In this paper the DNA content as a quantitative parameter of the cell content was analyzed on selected rat organs. Aging changes in parenchymatous and connective tissue (= mesenchymal) organs were examined. Further, some pilot studies on experimental animal models of human diseases (experimental shock and liver fibrosis) and their therapy were carried out. In these simulations of human diseases only some preliminary indications about changes in cell or DNA content, resp., of the various organs could be obtained. The results show that these pilot studies justify intensified continuation (in larger series).

Aging↗
PubMed1978

[Trends in modern international gerontological research. Morphological aspects].

Ageing develops during the whole life with differences on cells, tissues and organs, and begins if their capacities for adaptations and compensations decrease. Theories about ageing are insufficiently. That results from the further development of ageing research in morphology also. Parenchymal cells are reduced in all organs, in favour of an enhanced connective tissue content, the function of the single parenchymal and mesenchymal cell is not diminished coincidently in ageing. In the most organs are young and old cells in every age stage (but more old cells in senile age). The most cells don't live endless, but they can be regenerated. Their organelles possess own biological half life times, which are very shorter than their cell life times. Ageing-typical increase of the total content of connective tissue, esp. of collagen in many organs is combined with alterations of the proteoglycan and collagen metaoblism rates and patterns (collagen types included), and are thereby connected with age dependent changes of the several functions of the cells, tissues and organs. Everybody, and esp. the physician has to know that the mean age of the population (and of the patients) becomes higher. So we need the morphological research in gerontology also, as demonstrated and summarized in this review.

Adolescent↗