Details

Autor(en) / Beteiligte

• Fogaca, R.T.H
• Cavalcante, A.D.A
• Serpa, A.K.L
• Sousa, P.J.C
• Coelho-de-Souza, A.N
• Leal-Cardoso, J.H

Titel

effects of essential oil of Mentha x villosa on skeletal muscle of the toad

Ist Teil von

• Phytotherapy research, 1997-12, Vol.11 (8), p.552-557

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

1997

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• The effects of the essential oil of Mentha x villosa (EOMV) was investigated in saponin‐permeabilized fibres and in intact sartorius muscle of the toad. In intact muscle EOMV at concentrations from 1 to 100 μg/mL blocked the contraction induced by high (80 mM) potassium and induced potentiation of caffeine‐induced muscle contraction. From 1 to 6 mg/mL EOMV elicited contraction in both depolarized (by 110 mM K+) and non‐depolarized (4 mM K+) muscle fibres. This contraction was blocked by procaine. At 3 mg/mL EOMV depolarized the normal resting potential from −80.77 to −71.21 mV, but did not alter the transmembrane potential in the presence of 60 mM K+. EOMV (1 mg/mL) induced contraction of saponin‐permeabilized muscle fibres with an intact sarcoplasmic reticulum (SR). These data suggest that EOMV: (i) induces muscle contraction by releasing Ca2+ from SR; (ii) impairs the excitation–contraction coupling at a step before Ca2+ release from the SR. © 1997 John Wiley & Sons, Ltd.