PubMed Health⌕ Search

Biomedical subjects

Z Zbytniewski

Publications and source records attributed to Z Zbytniewski.

At least 19 recordsLinked to original sources
PubMed1991

[Excretion of vanillic acid and homovanillic acid and tissue distribution of catecholamines and their metabolites in mice with various levels of pigmentation].

Studies concerning metabolism of catecholamines in mice differing with respect to the degree of pigmentation were based on determination of daily excretion of vanillylmandelic and homovanillic acid and tissue content of epinephrine, norepinephrine, dopamine and their methoxy derivatives. It was found that pigmented mice excrete more homovanillic acid, the metabolite of dopamine, than do albinotic mice. Tissue studies have shown that the brain of albinotic mice contains more dopamine and kidneys more epinephrine, norepinephrine and their methoxy derivatives than the respective organs of the pigmented mice. The probable reasons of differences in the rate of inactivation of catecholamines in albinotic and pigmented mice have been discussed.

Animals↗
PubMed1981

Influence of some synthetic antioxidants on the growth and metastases formation of Lewis lung carcinoma and amelanotic B16 melanoma in C57BL mice.

Synthetic antioxidants: EPO (p-ethoxyphenol), PHP (p-hydroxypropiophenone), and DPPD (N,N'-diphenyl-p-phenylenediamine) dissolved in dimethylsulfoxide were administered subcutaneously to mice after subcutaneous implantation of Lewis lung carcinoma or amelanotic B16 melanoma into the tails. The doses of antioxidants used were: 50 mg/kg, 100 mg/kg, and 200 mg/kg per day, respectively. The animals received five injections a week during two weeks. The tails with Lewis lung carcinoma were amputated after 16 days and with amelanotic melanoma after 20 days; tumors weight was measured. 25 days after Lewis lung carcinoma and 42 days after B16 melanoma implantation mice were sacrificed, lungs weighed and incidence of pulmonary and extrapulmonary metastases were estimated. There was a significant increase of weight of amelanotic melanoma in animals treated with EOP or PHP (p less than or equal to 0.05). No influence of antioxidants on the metastases incidence of B16 melanoma was found. Antioxidants used did not influence the Lewis lung carcinoma weight, whereas EOP or PHP increased the incidence of extrapulmonary metastases (p = 0.05, and p = 0.1, respectively).

Animals↗
PubMed1981

Influence of aspirin and/or anabolic steroid (nandrolone decanoate) on experimental metastasis formation.

The influence on transpulmonary passage by an inhibitor of platelet aggregation, aspirin, and/or anabolic steroid, (Nandrolone decanoate), was investigated in syngeneic CBA mice. An increase of extrapulmonary metastases was used as a measure of increased redistribution of tumor cells from lungs to other organs. Aspirin alone did not reduce metastasis formation in lungs and did not significantly increase transpulmonary passage of tumor cells. The anabolic steroid increased the metastasis crop only in the lungs. However, treatment with the two compounds together increased the metastases in lungs and extrapulmonary organs. The results disclosed that in this system inhibition of platelet aggregation did not reduce metastasis formation but in combination with another drug, an anabolic steroid, it increased the number of experimental metastases.

Animals↗
PubMed1978

Cytofluorimetric measurement of DNA content in the cells of the transplantable melanotic and amelanotic Bomirski melanoma in golden hamster (Mesocricetus auratus, Waterhouse).

Cytofluorimetric measurements of the DNA content in transplantable melanotic and amelanotic tumor cells were carried out. The mean content DNA is higher in the amelanotic cells. The DNA distribution patterns are different in both tumors: there is a distinct stem line of the cells in the melanotic tumors whereas in the amelanotic cells there is a great variability in the DNA content and the stem line of the cells is absent. The correlation between these findings and some biological properties of the melanotic and amelanotic tumors are discussed.

Animals↗
PubMed1978

Activity of some lysosomal hydrolases in the homogenates of transplantable melanotic and amelanotic melanoma in golden hamster (Mesocricetus auratus, Waterhouse).

Activity of arylsulphatase, beta-glucuronidase, cathepsin D, and acid phosphatase in the homogenates of melanotic and amelanotic melanoma was determined. The activity of these enzymes is higher in melanotic than in amelanotic melanoma. Respective values for melanotic and amelanotic tumours are: arylsulphatase 10,78 +/- 3,20, and 1,45 +/- 0,66 micron 4-nitrocatechole/mg protein/hr; beta-glucuronidase 11,10 +/- 1,40, and 9,98 +/- 1,35 micron phenolphthalein/mg protein/hr; cathepsin D 4,24 +/- 1,37, and 3,26 +/- 0,73 micron tyrosine/mg protein/hr; acid phosphatase 230 +/- 22, and 180 +/- 25 micron p-nitrophenol/mg protein/hr. These differences are statistically significant. The increased activity of the lysosomal enzymes in melantoic melanoma probably depends on the occurrence of an higher number of lysosomes in tissues containing melanins.

Acid Phosphatase↗
PubMed1977

The effect of trasylol (Trascolan "Polfa") and p-aminomethylbenzoic acid (Pamba "Germed") on the experimental metastases of transplantable melanotic melanoma in golden hamster (Mesocricetus auratus, Waterhouse)

The influence of two proteinase inhibitors -- Trasylol (Trascolan "Polfa") and PAMBA ("Germed") -- on experimental metastases of melanotic melanoma has been studied in golden hamsters. Animals were injected intravenously with tumour cells (5x10(5) or 10(6) in 0.2 ml of saline). They obtained protease inhibitor intraperitoneally one hour prior, or one hour after melanoma cells injection. One group of hamsters were also inoculated with tumour cells preincubated 10 min. in saline containing Trasylol or PAMBA. A diminished number of experimental metastases to the lungs in each group has been observed.

4-Aminobenzoic Acid↗