Absence of immunosuppression in DBA/2 mice vaccinated with Trypanosoma cruzi treated with actinomycin-D

The subcutaneous (s.c.) vaccination of DBA/2 mice with 4 weekly doses of 3 x 10(7) living metacyclic forms of T. cruzi, Y strain, obtained from culture in axenic medium and treated for 24 h with actinomycin-D (50 micrograms/10(7) parasites), a drug that promotes an irreversible blockade of the parasite replication, do not induce any detectable degree of humoral and cellular immunosuppression as assessed by a) the production of anti-SRBC antibodies, b) the permanence of delayed cutaneous reaction to T. cruzi antigen, to PPD and DNCB and c) the degree of blastogenic transformation of spleen lymphocytes in the presence of the specific antigen.     

Carbamazepine inhibits NMDA-induced depolarizations in cortical wedges prepared from DBA/2 mice

There is some doubt as to the mechanism of action of the widely-used anticonvulsant drug, carbamazepine. In cortical wedges prepared from genetically epilepsy-prone DBA/2 mice, carbamazepine at therapeutic concentrations (1–10 M) markedly reduced the depolarization produced by N-methyl-D-aspartate (NMDA). The NMDA sub-type of glutamate receptor has been implicated in the pathogenesis of epilepsy and the inhibitory action of carbamazepine on this response suggests that the anticonvulsant action of the drug may be due to its blockade of NMDA receptor-mediated events.     

Carbamazepine inhibits NMDA-induced depolarizations in cortical wedges prepared from DBA/2 mice.

There is some doubt as to the mechanism of action of the widely-used anticonvulsant drug, carbamazepine. In cortical wedges prepared from genetically epilepsy-prone DBA/2 mice, carbamazepine at therapeutic concentrations (1-10 microM) markedly reduced the depolarization produced by N-methyl-D-aspartate (NMDA). The NMDA sub-type of glutamate receptor has been implicated in the pathogenesis of epilepsy and the inhibitory action of carbamazepine on this response suggests that the anticonvulsant action of the drug may be due to its blockade of NMDA receptor-mediated events.     

Changes in protein metabolism in proliferating and non-proliferating human acute leukaemia cells treated with actinomycin-D

Riassunto Negli elementi blastici di leucemia acuta umana incubati in vitro viene osservato un dimezzamento delle sintesi proteiche fra la prima e la seconda ora di contatto actinomicinico. Uno stesso comportamento metabolico è stato rilevato negli elementi blastici proliferanti e non proliferanti.     

Absence of tooth malformation in offspring of rats treated with a long-acting sulphonamide

Riassunto La 2-sulfanilamido, 3-metossi-pirazina, a differenza della 2-sulfanilamido, 4-6-dimetossi-pirimidina, non induce malformazioni dentarie nella prole, qualora venga somministrata al ratto durante la gestazione.     

Presence of anti-Trypanosoma cruzi antibodies in the sera of mice with experimental autoimmune myocarditis

Summary The existence of antigens shared in common byT. cruzi and heart muscle cells is suggested by the presence of antibodies binding to the parasite surface in the serum of mice with autoimmune myocarditis induced by immunization with syngeneic heart antigens.     

Presence of anti-Trypanosoma cruzi antibodies in the sera of mice with experimental autoimmune myocarditis.

The existence of antigens shared in common by T. cruzi and heart muscle cells is suggested by the presence of antibodies binding to the parasite surface in the serum of mice with autoimmune myocarditis induced by immunization with syngenic heart antigens.     

Renal regeneration in chloroform-poisoned male mice of strain C3H/He treated with di-sodium versenate

Résumé L'intoxication au chloroforme des souris mâles de la souche C3H/He entraîne la mort due à la nécrose et à la calcification tabulaire rénale. Le traitment par le versenate de sodium prévient la calcification ce qui rend possible la régénération des tubes contournés renaux.     

Cytochemical study of leucocytes of DBA/2 Mice after leukemia L1210 tumor graft]

The growth of L 1210 leukemia in DBA/2 strain mouse, provokes in the grafted animals intraleucocytic enzymatic modifications. As increase of acid phosphatase and a decrease of beta-glucuronidase were observed in the lymphocytes, the level of polymorphonuclear non-specific esterase being decreased. The implications of these modifications in the host response toward the tumor is discussed.     

Depigmentation and coat colour variegation in mice treated with 8-hydroxyquinoline

Zusammenfassung Die Melanogenese wird bei Mäusen durch 8-Hydroxychinolin selektiv gehemmt. Besonders bei behandelten weiblichen Tieren des Stammes C57BL entwickelt sich ein aussergewöhnliches Haarmuster mit abwechselnden schwarzen und weissen Streifen oder Kreisen. Diese reversible Wirkung wurde bei neugeborenen Mäusen oder nach Behandlung mit Cu-reaktiven Substanzen nicht beobachtet.

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I wish to thank Professor D. G.Harnden and Dr.Mary Lyon for their interest and advice, and Mr. C. R.Richardson for technical assistance. The work was supported by the Birmingham Branch of the British Empire Cancer Campaign for Research.     

Absence of naturally occurring coronary atherosclerosis in squirrel monkeys (Saimiri sciurea) treated with chondroitin sulfate A

Zusammenfassung Die überraschende Atheromatosehemmende Wirkung von Chondroitin-Sulfat konnte nun auch beiSaimiri scurea, einem Primaten mit hoher Inzidenz von Atheromatose, nachgewiesen werden.

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Supported in part by grants from the Heart Institute of the National Institutes of Health, U. S. Public Health Service, John A. Hartford Foundation, Inc., and other donors.     

Frequency distribution ofTrypanosoma cruzi in macrophages from resistant and susceptible strains of mice

Summary The frequency distribution ofTrypanosoma cruzi inside macrophages from normal of chronically infected resistant and susceptible mice obeys a negative binomial type of distribution. This implies that an aggregating mechanism operates inT. cruzi: macrophage interaction.Acknowledgments. We thank Dr Sylvio T. Torres for providing the inbred strains of mice. The work was supported by the Brazilian Research Council (CNPq) and the Financiadora de Estudos e Projectos (FINEP).     

Tumor induction in mice treated with hydrocortisone and innoculated with polyoma transformed hamster cells]

Tumors have been induced in hydrocortisone treated Mice innoculated with wild-type polyoma transformed Hamster cells. The filtrate from these tumors infects Mouse embryo cells and induces the production of polyoma virus. The polyoma virus has been characterised in the infected cells with anti-polyoma capsid serum.