The essential oil from Tagetes minuta L. modulates the binding of [3H]flunitrazepam to crude membranes from chick brain.

Abstract:

:The hypothesis that the essential oil from Tagetes minuta L. can interact with biological membranes was investigated by assessing its ability of perturbing the binding of a benzodiazepine [flunitrazepam (FNTZ)] to crude members from chick brains. The essential oil from T. minuta L. inhibited [3H]FNTZ specific binding to chick brain members. These values were obtained from the analysis of the saturation curve for the kinetic parameters: dissociation equilibrium constant (Kd) = 2.47 +/- 0.32 nM, maximal binding (Bmax) = 556 +/- 5 fmoles/mg protein, and Hill coefficient (n) = 1.00 +/- 0.07 in the absence, and Kd = 6.73 +/- 1.4 nM, Bmax = 583 +/- 69 fmoles/mg protein, and n = 1.02 +/- 0.08 in the presence of 29 microgram/mL of essential oil. The essential oil could self-aggregate with a critical micellar concentration (CMC) of 60 microgram/mL. The marked increase in [3H]FNTZ nonspecific binding starting at 60 micrograms of essence per mL was due to that phenomenon and revealed the ability of self-aggregated structures to interact with members. [3H]FNTZ specific binding decrement as a function of essence concentration cannot be ascribed merely to oil's micelles ability of trapping the lipophilic radioligand molecules, because the discontinuous behavior that characterizes a monomer-aggregate phase transition was not shown. Oil's components might behave as competitive inhibitors or allosteric modulators of FNTZ specific binding. However, their ability to increase FNTZ nonspecific binding at concentrations below oil's CMC suggests that this effect may be due to oil's partitioning into the lipid bilayer. This latter phenomenon would induce an increment in membrane fluidity and a change on FNTZ binding site toward a lower affinity conformation. Therefore, the essential oil components can interact with brain membranes either as monomers, by partitioning into the lipid bilayer, or as self-aggregated structures, through an adsorption to the membrane surface.

journal_name

Lipids

journal_title

Lipids

authors

García DA,Perillo MA,Zygadlo JA,Martijena ID

doi

10.1007/BF02536610

subject

Has Abstract

pub_date

1995-12-01 00:00:00

pages

1105-10

issue

12

eissn

0024-4201

issn

1558-9307

journal_volume

30

pub_type

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