Volume 33, Issue 3 pp. 240-249

Reduction of Allodynia by Intrathecal Transplantation of Microencapsulated Porcine Chromaffin Cells

Yu Mi Kim

Yu Mi Kim

Department of Oral Anatomy, School of Dentistry;

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Kyung Hwa Kwak

Kyung Hwa Kwak

Department of Anesthesiology, School of Medicine; and

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Jeong Ok Lim

Jeong Ok Lim

Department of Medical and Biological Engineering, Biomedical Research Institute, Kyungpook National University, Jung gu, Daegu, South Korea

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Woon Yi Baek

Woon Yi Baek

Department of Anesthesiology, School of Medicine; and

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First published: 23 February 2009
Citations: 13
Dr. Woon Yi Baek, Department of Anesthesiology, School of Medicine, Kyungpook National University, 50 Samduck 2ga, Jung gu, Daegu 700-721, South Korea. E-mail: [email protected]

Abstract

Bovine chromaffin cells (BCCs) are well known to have analgesic effect to reduce acute or chronic pain when transplanted in the subarachnoid space and have been considered as an alternative therapy for pain management. However, due to recent concerns over risks associated with prion transmission, porcine tissue is considered to be an alternate xenogeneic source for clinical use. In the present study, we investigated whether microencapsulated porcine adrenal medullary chromaffin cells (PCCs) also have analgesic effect to reduce allodynia caused by neuropathic pain in chronic constriction injury model of rat. PCCs were isolated from a porcine adrenal medulla and then microencapsulated with alginate and poly. In in vitro tests, the microencapsulated PCCs were investigated whether they have an ability to release catecholamines responding to nicotine stimulation. The levels of catecholamines released from the microencapsulated PCCs were significantly higher than from microencapsulated BCCs. In addition, the microencapsulated PCCs released catecholamines and met-enkephalin responding to cerebral spinal fluid (CSF) retrieved from a neuropathic pain model. In in vivo tests, implantation of microencapsulated PCCs reduced both mechanical and cold allodynia in chronic constriction injury model of a rat whereas the microencapsulated BCCs reduced only cold allodynia under the same conditions. The injection of antagonist of opioid peptides reversed the reduction of cold allodynia in microencapsulated PCC-received animal. The levels of catecholamines in the CSF of rats after implantation of microencapsulated PCCs were significantly higher than in the control group. These data suggest that microencapsulated PCCs may be another effective source for the treatment of neuropathic pain. 

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