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At least 91 records · Page 5Linked to original sources
PubMed1986

Characterization of macrophages elicited by intraperitoneal injection of hyaluronate.

Hyaluronate of 120,000 molecular weight has been injected in the peritoneal cavity of mice to study its effect on migration of inflammatory cells in vivo. After one day a dose-dependent granulocyte migration is observed. Three days later the number of granulocytes is greatly reduced and macrophages form about half of the total cell population. Hyaluronate-elicited macrophages show a decreased 5'-nucleotidase and an increased acid phosphatase activity as compared to resident macrophages. The production of superoxide anion in response to the phorbol ester tetradecanoyl-phorbolacetate, and the phagocytic activity are also enhanced. Macrophages elicited by hyaluronate secrete growth factor(s) for non-lymphoid mesenchymal cells. It is concluded that hyaluronate in vivo stimulates the migration of inflammatory cells, thus causing the recruitment of a population of stimulating macrophages. These effects may explain previous reports on the acceleration of wound healing by hyaluronate.

5'-Nucleotidase↗
PubMed1982

Comparison of the brain levels of N,N-dimethyltryptamine and alpha, alpha, beta, beta-tetradeutero-N-N-dimethyltryptamine following intraperitoneal injection. The in vivo kinetic isotope effect.

A comparison of the brain levels (microgram/g wet weight of tissue) of the hallucinogen N,N-dimethyltryptamine (DMT) and its deuterated analog alpha, alpha, beta, beta-tetradeutero-DMT (D4DMT) as a function of time and dose is reported. It was observed that the presence of deuterium in the alpha- and beta-positions of the ethylamine side-chain led to a potentiation of the level of DMT in brain. Strikingly different dynamics of uptake and clearance were also noted. We propose that these results are due to primary kinetic isotope effect, illustrating the importance of the alpha-position in the metabolism of DMT.

Animals↗
PubMed1975

Enhancement of picrotoxin convulsions in chicks and mice by the prior intraperitoneal injection of hypertonic GABA or mannitol.

Effects of i.p. injection of hypertonic solutions of GABA and mannitol on convulsant activity and latency to reduced or enhanced depending on whether picrotoxin was given i.p. or given i.v. or s.c. The principal cause of these changes appeared to be altered rates of absorption of picrotoxin. There was no evidence that cerebral dehydration afforded protection against picrotoxin.

Aminobutyrates↗