Metabolism of pyrrolizidine alkaloids by ruminal microbes
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Metabolism of pyrrolizidine alkaloids by ruminal microbes

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Published .
Written in English


  • Pyrrolizidines -- Metabolism.

Book details:

Edition Notes

Statementby Jeannette Talbot Hovermale.
The Physical Object
Pagination125 leaves, bound :
Number of Pages125
ID Numbers
Open LibraryOL15494611M

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Pyrrolizidine Alkaloid Plants, Metabolism and Toxicity Article Literature Review (PDF Available) in Journal of natural toxins 8(1) March with 1, Reads How we measure 'reads'. Pyrrolizidine alkaloids (PAs), sometimes referred to as necine bases, are a group of naturally occurring alkaloids based on the structure of izidine alkaloids are produced by plants as a defense mechanism against insect herbivores. More than PAs and PA N-oxides have been identified in over 6, plants, and about half of them exhibit hepatotoxicity. Pyrrolizidine alkaloids were among the first naturally occurring carcinogens identified in plants. In , a pure pyrrolizidine alkaloid, retrorsine, was found to induce liver tumors in experimental animals [75]. Subsequently, a series of pyrrolizidine alkaloids was found to induce liver tumors in experimental animals [47,48]. Riddelliine is a.   Abstract. Pyrrolizidine alkaloids (PA) are found mainly in plants of three families: Boraginaceae, Compositae and Leguminosae. In North America, PA poisoning of livestock is caused primarily by consumption of Senecio and Crotalaria spp. The PA of Senecio spp. cause irreversible hepatic damage; toxicity signs are a consequence of impaired liver function.. Cited by:

To compare hepatic metabolism of pyrrolizidine alkaloids (PAs) between sheep and cattle and elucidate the protective mechanism of sheep. Liver microsomes and cytosol from 8 .   Pyrrolizidine Alkaloids (PAs) are currently one of the most important botanical hepatotoxic ingredients. Glutathion (GSH) metabolism is the most reported pathway involved in hepatotoxicity mechanism of PAs. We speculate that, for different PAs, there should be a common mechanism underlying their hepatotoxicity in GSH by: 5. 2) Protozoa may account for as much as one-third of ruminal cellulolysis, and their presence may enhance the cellulolytic activity of bacteria. 7. Manipulations of Ruminal Microbes A. Ruminal microbial protein: 1) May be adequate for maintenance and during periods of slow growth or . The pyrrolizidine alkaloids that exhibit the most potent genotoxicity and tumori-genicity are the macrocyclic diester pyrrolizidine alkaloids, namely, the retronecine-, heliotridine-, and otonecine-type pyrrolizidine alkaloids. Shown in Table 1 are the pyrrolizidine alkaloids that were tested to be tumorigenic in experimental animals.

Pyrrolizidine alkaloidosis is a disease caused by chronic poisoning found in humans and other animals caused by ingesting poisonous plants which contain the natural chemical compounds known as pyrrolizidine alkaloids. Pyrrolizidine alkaloidosis can result in damage to the liver, kidneys, heart, brain, smooth muscles, lungs, DNA, lesions all over the body, and could be a . Members of a consortium of bacteria, isolated from the rumen of sheep, that degrades pyrrolizidine alkaloids (PAs) found in tansy ragwort (Senecio jacobaea) were characterized. An enrichment of ruminal bacteria was isolated from a sample of ruminal fluid using standard anaerobic by:   Abstract. Pyrrolizidine alkaloids (PAs) encompass a typical class of plant secondary compounds. During recent years PAs have proved to be an excellent choice to exemplify various mechanistic and functional aspects of plant secondary by: 3 SUMMARY Pyrrolizidine alkaloids (PAs) which may find their way into human and animal food in Australia are derived mainly from the plants Heliotropium europaeum, Echium plantagineum, Symphytum spp. and Crotalaria retusa. The Sympthytum spp. (comfrey) are deliberately ingested while the remaining species are weeds in variousFile Size: 61KB.