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Epithelial heparin delivery via microspheres mitigates experimental colitis in mice

Pellequer, Yann and Meissner, Yvette and Ubrich, Nathalie and Lamprecht, Alf (2007) Epithelial heparin delivery via microspheres mitigates experimental colitis in mice. JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS, 321 (2). pp. 726-733.

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Low-molecular-weight heparins ( LMWH) have been shown to be efficient in the treatment of inflammatory bowel disease (IBD). Parenteral heparin therapy, however, may cause hemorrhagic adverse effects. To reduce this risk, epithelial LMWH delivery in combination with a system ensuring selective drug release to the inflamed tissue was tested here. Enoxaparin loaded microspheres ( MS) were administered orally to male BALB mice suffering from a pre-existing experimental colitis, whereas control groups received subcutaneous or rectal LMWH solution. Colon weight/length index and alkaline phosphatase and myeloperoxidase activities were assessed to determine the inflammation. Tissue penetration experiments elucidated the processes involved in the proposed new therapeutic approach. Oral LMWH-MS proved to be equally efficient in mitigating experimental colitis as rectally administered LMWH solution when quantified by myeloperoxidase activity ( MS, 10.2 +/- 1.5 U/mg tissue; rectal, 9.2 +/- 1.6 U/mg) and to be superior to subcutaneous LMWH (s.c., 21.6 +/- 5.6 U/mg; untreated colitis control, 30.0 +/- 3.8 U/mg). Pharmacokinetic studies found a notably low systemic availability of oral LMWH delivered from MS (<5%) indicating a low potential for adverse effects. The tissue permeability was selectively enhanced in the inflamed regions where a 9-fold higher LMWH penetration was found compared with healthy tissue. Epithelial LMWH delivery has been found a promising anti-inflammatory therapeutic approach. The use of LMWH-MS in this context offers a promising tool for IBD therapy by enhancing specifically drug availability at inflamed tissue sites while reducing the risk for systemic adverse effects to a negligibly low level.

Item Type:Article
Subjects:Biomedical Science > Nanotechnology for animal health
Biomedical Science > Nanotechnology for human health
Biomedical Science > Nanomedicine
ID Code:791
Deposited By:Farnush Anwar
Deposited On:05 Dec 2008 13:00
Last Modified:05 Dec 2008 13:00

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