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Open Access Development of a Novel Intestinal and Vascular Access Port (IVAP) Rabbit Model to Study Regiospecific Oral Absorption Pharmacokinetics

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Abstract:

Background and Purpose: The limited availability and cost of many drugs prohibits routine use of the previously developed intestinal and vascular access port (IVAP) canine model by our group. A lower animal species model such as the rabbit is suitable for implanting intestinal and vascular access ports for investigating regiospecific intestinal absorption and hepatic elimination while requiring significantly lower doses of drugs. In addition, expression of certain cytochrome P450 enzymes and apical secretory and absorptive transporters in rabbit intestine is similar to that in humans making the rabbit a suitable model.

Methods : Individual 5-F Silastic catheters were placed in the proximal or distal portion of the small intestine or the colon of subject animals, while a 5-F Heparin Coated Polyurethane (HCP) catheter was implanted in the portal vein of each subject. The catheters were tunneled out of the abdomen and attached to separate subcutaneous access ports along the spine. The animals were allowed a two-week minimum recovery period prior to being used in pharmacokinetic studies.

Results and Discussion: After some initial difficulties, rabbits with IVAP implants proved to be an efficient and dependable model for investigating intestinal and hepatic extraction of drugs. Fluoroscopic visualization of intestinal and portal venous catheters indicated that surgically implanted catheters did not interfere with gastrointestinal motility or blood flow into the liver, respectively. Acute pH studies in the proximal portion of the small intestine were consistent with normal GI motility patterns.

Document Type: Research Article

Affiliations: 1: Department of Pharmaceutics, College of Pharmacy, The State University of New Jersey Rutgers, 160 Frelinghuysen Road, Piscataway, New Jersey 08854 2: Department of Surgery, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, New Brunswick, New Jersey 08901

Publication date: August 1, 2001

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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