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PubMed1995

Distribution of various nickel compounds in rat organs after oral administration.

In this study, eight kinds of nickel (Ni) compounds were orally administered to Wistar male rats and the distribution of each compound was investigated 24 h after the administration. The Ni compounds used in this experiment were nickel metal [Ni-M], nickel oxide (green) [NiO(G)], nickel oxide (black) [NiO(B)], nickel subsulfide [Ni3S2], nickel sulfide [NiS], nickel sulfate [NiSO4], nickel chloride [NiCl2], and nickel nitrate [Ni(NO3)2]. The solubilities of the nickel compounds in saline solution were in the following order; [Ni(NO3)2 > NiCl2 > NiSO4] >> [NiS > Ni3S2] > [NiO(B) > Ni-M > NiO(G)]. The Ni level in the visceral organs was higher in the rats given soluble Ni compounds; Ni(NO3)2, NiCl2, NiSO4, than that in the rats receiving other compounds. In the rats to which soluble Ni compounds were administered, 80-90% of the recovered Ni amounts in the examined organs was detected in the kidneys. On the other hand, the Ni concentration in organs administered scarcely soluble Ni compounds; NiO(B), NiO(G), and Ni-M were very low. The estimated absorbed fraction of each Ni compounds was increased with the increase of the solubility. These results suggest that the kinetic behavior of Ni compounds administered orally is closely related with the solubility of Ni compounds, and that the solubility of Ni compounds is one of the important factors for determining the health effect of Ni compounds.

Absorption↗
PubMed1982

[Induction of interferon and activation of NK cells and macrophages in mice by oral administration of Ge-132, an organic germanium compound].

After oral administration of an organic germanium compound, Ge-132 (300 mg/kg), a significant level of interferon (IFN) activity was detected in the sera of mice at 20 hr and it reached a maximum of 320 U/ml at 24 hr. This IFN activity was lost after heat- or acid-treatment, suggesting that the induced IFN is of gamma nature. The molecular weight of this IFN was estimated to be 19,000 daltons by gel filtration. After the oral administration of Ge-132, NK activity of spleen cells had increased at 24 hr and cytotoxic macrophages were induced in the peritoneal cavity at 48 hr. In mice, receiving intraperitoneal (i.p.) injections of trypan blue or carrageenan 2 days before oral administration of Ge-132, neither induction of IFN nor augmentation of NK activity followed. X ray irradiation of mice also rendered the mice incapable of producing IFN, all suggesting that both macrophages and lymphocytes are required for this IFN induction. After i.p. administration of induced IFN, both NK and cytotoxic macrophage activities appeared at 48 hr with as little as 20 U/ml titered IFN. These facts may indicate that the augmentation of NK and activation of macrophages in mice after oral administration of Ge-132 is mediated by induced IFN.

Administration, Oral↗
PubMed1985

Induction of interferon and activation of NK cells and macrophages in mice by oral administration of Ge-132, an organic germanium compound.

After oral administration of an organic germanium compound, Ge-132 (300 mg/kg), a significant level of interferon (IFN) activity was detected in the sera of mice at 20 hr and it reached a maximum of 320 U/ml at 24 hr. This IFN activity was lost after heat- or acid-treatment, suggesting that the induced IFN is of gamma-nature. The molecular weight of this IFN was estimated to be 50,000 daltons by gel filtration. The NK activity of spleen cells was increased 24 hr after the oral administration of Ge-132, and cytotoxic macrophages were induced in the peritoneal cavity by 48 hr. In the mice receiving an intraperitoneal (ip) injection of trypan blue or carrageenan 2 days before oral administration of Ge-132, neither induction of IFN nor augmentation of NK activity occurred, and X-ray irradiation of mice also rendered the mice incapable of producing IFN, all indicating that both macrophages and lymphocytes are required for this IFN induction. Both NK and cytotoxic macrophages appeared 18 hr after ip administration of the induced IFN with a titer as low as 20 U/ml. These facts suggest that both the augmentation of NK activity and activation of macrophages in mice after oral administration of Ge-132 are mediated by the induced IFN.

Administration, Oral↗
PubMed2001

Organ transplantation: present scenario and future strategies for transplant programme (specially cadaveric) in India: socio-administrative respects.

Organ transplantation was enacted by a law "Transplantation of Human Organ Act" in 1994 but still, getting the consent from the relatives of brain dead person is a very difficult task and hence cadaveric transplant accounts for a minimum number. In India, most of the transplantations carried out are related to living donor and very few are cadaveric. The poor status of cadaver transplantation may be attributed to the moral, emotional and religious beliefs and taboos that inhibit the relatives of the deceased to come forward to donate organ(s) of a brain dead person.Non-existence of a trained transplant co-ordinator who is the backbone of any successful transplant programme is another reason for poor response in cadaver transplantation. The great task is to motivate and prepare the relatives for organ donation of their near and dear ones. Transplant co-ordinators are being prepared for motivating individuals or relatives for donation. To promote human organ transplantation government's initiative is very important. Mass media supported by the government can develop better awareness among the people. Non-government organisations (NGOs) can help in the similar ways. All hospitals are not authorised for the procedure of human organ transplantation. Other hospitals can help the process by informing the authorised hospitals about recent admission of potential donor (brainstem death). Role of transplant coordinator is crucial. He/she is the real inspiration to make agree the relatives for organ donation. Overall success of transplant programme is based on co-ordinated activity. Involvement of all agencies to motivate the person to pledge for organ donation during his/her life time is the first and the foremost requirement for successful planning and programme of organ transplantation.

Cadaver↗
PubMed1982

Localization of radioactivity in rat organs after oral administration of tritiated 8-methoxypsoralen in therapeutic doses.

Tritiated 8-methoxypsoralen was given perorally to rats in amounts corresponding to therapeutic human doses. The rats were exposed to UVA light or kept in darkness. None of the fractions (apart from 3H2O from the lens) examined changed their level of radioactivity under the influence of UVA light. Time-radioactivity curves were recorded for the skin, lens, residual eye, and the liver. Four fractions were measured: 3H2O, soluble pool, DNA-RNA, and protein. Tritiated water appeared already 1 h after ingestion, and attained maximum value 9-24 h after ingestion, indicating the efficiency with which the liver degrades 8-MOP. 3H-8-MOP and metabolites could be detected in the soluble pool in maximum amounts 2-3 h after the administration. Pretreatment with trypsin increased the concentration of 3H-8-MOP and metabolites; the origin of this extra radioactivity was the protein fraction. The 3H-8-MOP binding to DNA or RNA was studied by pretreatments of the homogenates with DNase or RNase followed by measurement of radioactivity in the TCA extracts. This indicated that no measurable amount of 3H-8-MOP had been bound to DNA or RNA. We conclude that 8-MOP administered to rats in amounts corresponding to human therapeutic doses does not bind to DNA or RNA in measurable amounts either after UV-light or in darkness. The experiments have shown proteins to be the main binding site in rat organs.

Administration, Oral↗
PubMed1987

Prevention of parathyroid hormone-dependent nephrocalcinosis by chronic administration of the organic phosphorothioate WR-2721.

Pharmacological inhibition of parathyroid hormone (PTH) secretion has been the object of several experimental and clinical trials in the past. It is only recently that a drug, WR-2721 [S-,2-(3-aminopropylamino)-,ethylphosphorothioic acid], has been shown to effectively inhibit PTH secretion in euparathyroid subjects and in parathyroid cancer patients within a few hours after its administration. In the present study we tested its long term efficacy as a PTH inhibitor in a model of nephrocalcinosis resulting from secondary hyperparathyroidism. Intact and thyroparathyroidectomized (TPTX) rats were pair-fed on a low Ca (0.2%)-high phosphorus (1.6%) diet (nephrocalcinotic diet) or on a normal Ca (1.1%)-normal phosphorus (0.8%) diet for 7 days. Simultaneously, either 0.2 mmol/kg of WR-2721 or its solvent was injected subcutaneously twice daily. The intact animals on the nephrocalcinotic diet had an increased urinary cyclic AMP excretion and important renal Ca accumulation. This nephrocalcinosis was markedly reduced by WR-2721 treatment. The kidney Ca content of the WR-2721-treated rats was 58 +/- 6% lower than that of the nontreated animals. The low Ca-high phosphorus diet did not cause nephrocalcinosis in the TPTX rats. WR-2721 failed to reduce the nephrocalcinosis induced by 1,25 dihydroxyvitamin D3 intoxication in TPTX rats fed the normal Ca-normal phosphorus diet. In conclusion, the present study suggests that chronic treatment with WR-2721, a potent inhibitor of PTH secretion, may be effective for preventing the deleterious consequences of hyperparathyroidism, such as nephrocalcinosis.

Amifostine↗
PubMedDate not supplied

[Oxidation and reduction of glutathione in rat organs during the administration of ethonium].

An intramuscular administration of ethonium in a dose of 5 and 10 mg/kg 4-6 h later decreases the level of the reduced glutathione and increases that of oxidized glutathione and the glutathione peroxidase activity in the liver and kidneys of albino rats. The duration of the preparation effect depends on the dose and organ, changes in the glutathione reductase activity in the liver, kidneys, lungs, spleen and heart are not found. Participation of ethonium in formation of peroxides in the organism tissues is shown possible.

Animals↗