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Pharm Biol. 2016;54(4):705-11. doi: 10.3109/13880209.2015.1072829. Epub 2015 Oct 1.

Kaurane diterpenes as mitochondrial alterations preventive agents under experimental oxidative stress conditions.

Author information

1
a Department of Pharmacology , Faculty of Pharmacy, University Complutense , Madrid , Spain .
2
b Center for Neuroscience and Cell Biology, University of Coimbra , Coimbra , Portugal , and.
3
c Faculty of Medicine , Laboratory of Physiology, University of Coimbra , Coimbra , Portugal.

Abstract

CONTEXT:

Foliol, linearol, and sidol are the most common diterpenes found in Sideritis L. spp. (Lamiaceae) with a wide range of demonstrated properties including anti-inflammatory, antioxidant, and anti-apoptotic effects.

OBJECTIVE:

For the first time, the present work was studied for the potential protective role of these kaurane-type diterpenes on mitochondrial oxidative stress induced by H2O2 in the human astrocytoma U373-MG cell line and in the rat adrenal pheochromocytoma PC12 cell line.

MATERIALS AND METHODS:

Mitochondrial protection was assayed at 5 and 10 µM concentrations for 24 h (for kaurane diterpenes) and H2O2 as oxidative stress inducer (0.1 mM for PC12 cells and 1 mM for U373-MG, for 30 min). ATP concentration was determined by high-performance liquid chromatography (HPLC), and changes in mitochondrial membrane potential, caspase-3 activity as well as in cytosolic and mitochondrial calcium levels were assessed by fluorometric techniques, by using specific fluorescent probes.

RESULTS:

Pretreatments for 24 h with linearol and sidol, prior to H2O2 exposure, acted as mitochondrial alterations preventive agents by increasing membrane potential (over 40-60% in PC12 cells and over 10-20% in U373-MG), restoring both cytosolic and mitochondrial calcium homeostasis (linearol at 10 µM caused a 3.5-fold decrease in cytosolic calcium concentration in PC12 cells), decreasing caspase-3 activity (over 1.25-1.5-fold for linearol and sidol) and avoiding ATP depletion (linearol increased over 20% ATP level in both cell types).

CONCLUSION:

Our results suggest that linearol and sidol could provide protective activity by targeting mitochondria in response to the deleterious changes induced by H2O2.

KEYWORDS:

Hydrogen peroxide; mitochondria; natural products; reactive oxygen species

PMID:
26427521
DOI:
10.3109/13880209.2015.1072829
[Indexed for MEDLINE]

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