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Role of L-DOPA in spinal nociceptive reflex activity: higher sensitivity of Adelta versus C fibre-evoked nociceptive reflexes to L-DOPA

Schomburg ED, Dibaj P, Steffens H.

. 2011 ; 60 (4) : 701-703.

Language English Country Czech Republic

Document type Comparative Study, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc11037188

The role of L-DOPA in spinal nociceptive reflex activity has been re-evaluated. In high spinal cats, with supraspinal loops being excluded, the onset of reflex facilitation induced by noxious radiant heat is delayed after injection of L-DOPA by 4 to 10 s, i.e. the early component of nociceptive reflex facilitation is blocked, while the late component persisted. Further investigations have shown that the early component of reflex facilitation induced by noxious radiant heat is mediated by Adelta-fibres and the late component by C-fibres. Therefore, it can be assumed that L-DOPA, like opioids, preferentially blocks the transmission in nociceptive reflex pathways from Adelta-fibres.

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Lit.: 16

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$a The role of L-DOPA in spinal nociceptive reflex activity has been re-evaluated. In high spinal cats, with supraspinal loops being excluded, the onset of reflex facilitation induced by noxious radiant heat is delayed after injection of L-DOPA by 4 to 10 s, i.e. the early component of nociceptive reflex facilitation is blocked, while the late component persisted. Further investigations have shown that the early component of reflex facilitation induced by noxious radiant heat is mediated by Adelta-fibres and the late component by C-fibres. Therefore, it can be assumed that L-DOPA, like opioids, preferentially blocks the transmission in nociceptive reflex pathways from Adelta-fibres.
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