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References: Laxative

Biomed Environ Sci. 1992 Dec;5(4):283-92.
Experimental podophyllotoxin (bajiaolian) poisoning: I. Effects on the nervous system.

Chang LW, Yang CM, Chen CF, Deng JF.

Department of Pathology, University of Arkansas for Medical Sciences, Little Rock 72205.

Bajiaolian, one of the species in the Mayapple family (Podophyllum pelatum), has been widely used as a traditional Chinese herbal medicine for the remedies of snake bites, general weakness, poisons, condyloma accuminata, lymphadenopathy, and certain tumors in China. In Western medicine, Podophyllum was first used medically as a laxative in the early 19th century. Since 1940, the resin of podophyllum has also been used topically for various skin lesions, such as warts and condyloma. Human poisonings have been reported. An animal model was established to investigate the neurotoxic effects of Bajiaolian. Podophyllotoxin, the major active ingredient in Podophyllum, was injected (ip) to young adult male rats at doses of 0, 5, 10, or 15 mg.kg-1 b.w.. The animals were sacrificed 72 h after injection. Neuronal changes were readily observable in animals treated with 10 or 15 mg.kg-1 of the toxin. Edematous changes of the anterior horn motoneurons were observed in the spinal cord. No neuronal necrosis was found. The type of neuronal swelling is believed to be only a transient change and would probably subside with time if no further assaults occur. More serious and perhaps longer term of changes were found in the dorsal ganglion neurons and the nerve fibers (axons) in the central and peripheral nervous system. Severe depletion of the Nissl substance (RNA/polyribosomes) was observed in the dorsal root ganglion neurons. Alterations in these sensory neurons would give rise to and correlate with the sensory disturbances experienced by the patients. Bodian staining also revealed a dose-related increase in the coarseness (thickness) of the nerve fibers (axons) in the cerebellum, cerebral cortex, brainstem, and spinal cord. This is the first scientific study

Pharmacology. 1993 Oct;47 Suppl 1:196-204.
Effects of sennosides and nonanthranoid laxatives on cytochemistry of epithelial cells in rat colon.

Yang K, Fan K, Mengs U, Lipkin M.

Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, N.Y. 10021.

The cytochemical effects of laxatives on rat colonic epithelial cells were studied. A total of 32 rats was divided into four groups. Three groups were treated with bisacodyl, picosulfate and sennosides for 12 weeks, and a fourth group served as control. The rectum, midcolon and cecum were studied for acidic mucins, lectin soybean agglutinin (SBA) and cytokeratin AE1. Most striking and consistent changes were found in the rectum including total acidic mucin content which significantly increased, with sulfomucin decreased and sialomucin increased in the three treatment groups. Cytokeratin AE1 expression increased on picosulfate and sennosides. SBA total binding increased on bisacodyl and picosulfate. The present findings were thought to be of functional origin and do not represent early precancerous lesions.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7694305&dopt=Abstract constipation laxative

J Pharm Pharmacol. 1993 Oct;45(10):916-8.
Increased ex-vivo colonic generation of PAF induced by diphenylmethane stimulant laxatives in rats, mice, guinea-pigs and rabbits.

Izzo AA, Mascolo N, Autore G, Di Carlo G, Capasso F.

Department of Experimental Pharmacology, University of Naples Federico II, Italy.

The effects of in-vivo treatment with bisacodyl, phenolphthalein, picosulphate, sulphosuccinate, mannitol and lactulose laxatives were examined on the ex-vivo formation of platelet-activating factor (PAF) by duodenum and colon of rat, mouse, guinea-pig and rabbit. Bisacodyl (10 mg kg-1), phenolphthalein (20 mg kg-1) and picosulphate (10 mg kg-1), but not sulphosuccinate (40 mg kg-1), mannitol (50 mg kg-1) or lactulose (50 mg kg-1), at doses that all caused laxation, markedly increased PAF in the colon (P < 0.01) but not in the duodenum. Intraluminal release of acid phosphatase was also significantly increased in the colon of rats treated with bisacodyl, phenolphthalein and picosulphate, but not in colons of animals treated with sulphosuccinate, mannitol or lactulose. The data show that enhanced generation of PAF is associated with the colonic damage induced by diphenylmethane laxatives, but do not show whether this is a cause or a consequence of the pathophysiological changes.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=7904633&dopt=Abstract constipation laxative

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