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• Vol.53 No.11
• CLINICA NEUROL, 53: 1382−1385, 2013
• Vol.53 No.11 contents

Symposium 4

Gastrointestinal dysfunction has important implications for plasma L-dopa concentrations in Parkinson's disease

Hirokazu Doi, Ph.D.¹⁾, Ryuji Sakakibara, M.D. Ph.D.²⁾, Masahiko Kishi, M.D. Ph.D.²⁾, Yohei Tsuyuzaki, M.D.²⁾, Fuyuki Tateno, M.D.²⁾ and Shigekazu Hirai¹⁾

¹⁾Pharmaceutical unit, Toho university Sakura medical center
²⁾Neurology, Internal medicine, Toho university Sakura medical center

Gastrointestinal motility dysfunctions including anorexia, nausea, heartburn, bloating, etc. are common and frequent complication of Parkinson's disease (PD). Degeneration of enteric nerves system is supposed to be a pathogenesis of these symptoms. Impairment of gastric emptying (GE) leads to retardation of the drug delivery from stomach to jejunum, so that PD patients with GE impairment show the delayed elevation of plasma L-dopa concentration. Disturbance of L-dopa absorption will result in wearing-off and delayed-on, and these are called motor fluctuation. In our investigation, 69% of PD patients who exhibited delayed elevation of plasma L-dopa concentration complicated GE impairment, whereas only 22% of patients with normal L-dopa level showed GE retardation (p = 0.0044, χ²-test). Serotonin 5-HT₄ agonist and dopamine D₂ antagonist are useful to improve GE impairment in PD. These drugs stimulate the postganglionic cholinergic fiber to release acetylcholine amongst the enteric nerves system and facilitate the gastrointestinal tract. Rikkunshi-to, dietary herbal medicine, is also administered to ameliorate gastrointestinal symptoms in PD. Rikkunshi-to is reported to improve erratic GE and reduce the variation of plasma L-dopa level. Recently, intestinal continuous L-dopa administration is expected as the potential solution for L-dopa induced motor fluctuation in advanced PD.
Full Text of this Article in Japanese PDF (897K)

(CLINICA NEUROL, 53: 1382−1385, 2013)
key words: Parkinson's disease, autonomic failure, non-motor symptom, gastric emptying, L-dopa

(Received: 1-Jun-13)