Abstract:
:Adrenal medullary transplants in the spinal subarachnoid space, by providing a continual source of opioid peptides and catecholamines, offer a potentially important adjunct in the management of chronic pain. While previous studies have shown that this approach is effective against high-intensity phasic stimuli, adrenal medullary implants need to be evaluated against long-term and abnormal pain syndromes before transplantation can be used for human chronic pain. Using a recently developed model of painful peripheral neuropathy, the effects of adrenal medullary chromaffin cells transplanted into the subarachnoid space was evaluated. Peripheral mononeuropathy was induced by loosely tying 4 ligatures (4-0 chromic gut) around the right sciatic nerve. This procedure produces various pain symptoms including allodynia, hyperalgesia and dysesthesia. Rats were given either adrenal medullary tissue or control striated muscle transplants. Animals with adrenal medullary tissue transplants showed markedly decreased allodynia to innocuous cold as early as 1 week post-transplantation. In addition, hyperalgesia to a noxious thermal stimulus was eliminated by adrenal medullary, but not control, transplants. Touch-evoked allodynia was only slightly reduced by adrenal medullary transplants. In addition, indicators of spontaneous pain appeared reduced in animals with adrenal medullary transplants. These findings indicate that adrenal medullary transplants may be effective in reducing neuropathic pain.
journal_name
Painjournal_title
Painauthors
Hama AT,Sagen Jdoi
10.1016/0304-3959(93)90135-Csubject
Has Abstractpub_date
1993-02-01 00:00:00pages
223-231issue
2eissn
0304-3959issn
1872-6623pii
00006396-199302000-00013journal_volume
52pub_type
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