Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0002874 (aplastic anemia)
 5,905 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Sublethally irradiated CBA/J mice injected with lymph node cells (LNC) of C3H/He mice exhibit aplastic anemia within 3 weeks. Aplastic anemia plasma (AAP) from these mice was found to inhibit granulocyte-macrophage colony (GM-CFU) formation. This inhibitory action was not strain specific and was not generated in donor:host combination involving other strains. AAP also inhibited the formation of colonies derived from leukemic cell lines. Though this activity inhibited GM-CFU, it did not affect erythroid colony formation. Two experiments were performed to examine the mechanism of inhibition. Superoptimal concentrations of recombinant mouse granulocyte-macrophage colony-stimulating factor (GM-CSF) did not reverse AAP-induced inhibition of colony formation. Bone marrow cells preincubated with AAP for 24 h and washed were unchanged in their ability to form GM-CFU colonies. Thus, the inhibitory activity acted neither as a competitive nor a cytotoxic agent. Interferons and certain prostaglandins, known to inhibit colony formation, were not found in active concentrations in AAP. The inhibitory activity of AAP was heat stable, nondialyzable, inextractable with chloroform, precipitable with 50% ammonium sulfate, and had a molecular weight of 100,000 daltons. In contrast, control plasma from mice given only sublethal irradiation and injected with saline had significantly less inhibitory activity, which was not heat stable and was extractable with chloroform. Thus, LNC in certain host mouse strains generate a plasma activity that can inhibit the formation of normal and leukemic GM-CFU colonies.
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PMID:Inhibitor of granulocyte-macrophage colony formation in plasma of mice rendered aplastic by allogeneic lymph node cells. 246 13

T2, a chloroform/methanol extract of the herb Tripterygium wilfordii Hook f, has been used in China for the treatment of autoimmune and inflammatory diseases for many years. Recent experimental evidence has confirmed that T2 has potent anti-inflammatory and immunosuppressive activity, and a United States Food and Drug Administration-approved clinical trial is currently exploring the efficacy of T2 in the treatment of rheumatoid arthritis. Despite the potential therapeutic benefits of T2, there is ample documentation that T2 is toxic, targeting, among other things, the hematopoietic system, and its use has resulted in cases of leukopenia, thrombocytopenia, and aplastic anemia. This investigation was undertaken to characterize the in vitro effects of T2 on primary human CD34-positive (CD34+) bone marrow cells. Our results demonstrate that T2 has a potent inhibitory effect on the clonogenic response of human bone marrow cells to exogenously added hematopoietic growth factors. The inhibition of colony formation by T2 is not the result of direct cytotoxicity or increased apoptosis and indicates a functional suppression of hematopoiesis. Additional experiments demonstrate that T2 also alters transcriptional regulation in bone marrow cells by inhibiting nuclear factor-kappaB. This transcription factor is found in CD34+ bone marrow cells and has been recently shown to be a requirement for colony formation. These results demonstrate that therapeutic concentrations of T2 exert a significant hematotoxic effect by inhibiting growth factor response in CD34+ bone marrow cells and suggest that inhibition of nuclear factor-kappaB may play a role in the blood dyscrasias encountered with the use of this drug.
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PMID:Hematotoxicity of the chinese herbal medicine Tripterygium wilfordii hook f in CD34-positive human bone marrow cells. 1069 91

The analysis of the glue "RAZI" was carried out at the Republican Chromatographic Center of Georgia, with high-efficient liquid chromatographic equipment "Millipore Waters" (USA), by I. Wagner's Method. We were able to determine presumable composition of the glue chemical components. The different substances were evaporated at different times fixed by appropriate peaks on chromatogram. There have been at least five toxic substances identified within the glue composition, which are used as industrial or household chemical goods and as some authors explain, may be used as inhaling psychoactive substances. These substances are: benzol (benzene), toluene (toluol), phenol (carbolic acid), chloroform, and methyl-ketone. The glue is inhaled with a small polyethylene bag. The substances are evaporated during inhalation and join arterial blood through lungs. In several minutes leap forward a situation similar to alcohol intoxication. The evaporated substances characterized by strong toxicity and influence to the organism in different ways. The results of chronic glue abuse is serious, such as lethal aplastic anemia, leukemia, marrow damage, chromosome aberrations, functional disorders of CNS, dystrophic changes in myocardium, cirrhosis, liver atrophy and so on. Abuse of the glue "RAZI" can lead to very serious medical consequences and represents emerging public health problem in Georgia.
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PMID:Study of chemical composition of glue "RAZI" used by solvent abusers in Tbilisi. 1670 32