Limits...
Gastroprotective Mechanisms of the Monoterpene 1,8-Cineole (Eucalyptol).

Rocha Caldas GF, Oliveira AR, Araújo AV, Lafayette SS, Albuquerque GS, Silva-Neto Jda C, Costa-Silva JH, Ferreira F, Costa JG, Wanderley AG - PLoS ONE (2015)

Bottom Line: CIN (100 mg/kg) reduced the volume of basal but not stimulated acid secretion.This findings demonstrate the role of 1,8-cineole as an important ulcer healing agent and indicate the involvement of antioxidant and cytoprotective mechanisms in the gastroprotective effect of compound.This study also provides evidence that 1,8-cineole is related to the gastroprotective effect of the essential oil of Hyptis martiusii.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutical Sciences, Universidade Federal de Pernambuco, 50740-521, Recife, PE, Brazil.

ABSTRACT
Recently, our research group identified and reported 1,8-cineole (CIN), a monoterpene that naturally occur in many aromatic plants, as one of the major constituent of the essential oil from leaves of Hyptis martiusii (EOHM), as well as characterized the gastroprotective action of this oil. The aim of this study was to investigate the mechanisms of action involved in the antiulcer and healing activity of CIN, in order to confirm its correlation with the gastroprotective effect of EOHM. Wistar rats were exposed to different protocols (acute ulceration, gastrointestinal motility and antisecretory activity). In addition, were determinated the involvement of nitric oxide and sulphydryl groups; the levels of gastric mucus, lipid peroxidation, sulphydryl groups and myeloperoxidase activity. The healing ability was evaluated by acetic acid-induced chronic ulcer and histological and immunohistochemical analysis (PCNA, Ki-67 and BrdU). The treatment with CIN inhibited ethanol-, ethanol/HCl- and indomethacin-induced gastric lesions. The highest doses of CIN inhibited gastric emptying, but did not affect intestinal transit. CIN (100 mg/kg) reduced the volume of basal but not stimulated acid secretion. CIN increased levels of mucus (89.3%), prevented depletion of -SH groups (62.6%) and reduced the level of lipid peroxidation (55.3%) and myeloperoxidase activity (59.4%) in the gastric mucosa. In chronic ulcer model, CIN reduced in 43.1% the gastric area lesion, promoted significant regeneration and restoration of the levels of mucus in glandular cells as confirmed by histological analysis; and promoted increase in cell proliferation as evidenced by reactivity for PCNA, Ki-67 and BrdU. This findings demonstrate the role of 1,8-cineole as an important ulcer healing agent and indicate the involvement of antioxidant and cytoprotective mechanisms in the gastroprotective effect of compound. This study also provides evidence that 1,8-cineole is related to the gastroprotective effect of the essential oil of Hyptis martiusii.

No MeSH data available.


Related in: MedlinePlus

Immunohistochemical analysis for PCNA (proliferating cell nuclear antigen), Ki-67 and BrdU of the gastric mucosa of the rats subjected to induction of chronic ulcer by 30% acetic acid.Animals were treated orally with 1% Tween-80 aqueous solution (control group), pantoprazole (40 mg/kg) or CIN (100 mg/kg) for 14 days. The filled arrow indicates the absence of the epithelial layer (ulcer area internal) and the dashed arrow indicates epithelial layer remaining (ulcer edge). Microphotographs depict the immunoreactivity for PCNA, Ki-67 and BrdU in the groups, magnification 200x (control) and 500x (CIN or pantoprazole).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4526535&req=5

pone.0134558.g004: Immunohistochemical analysis for PCNA (proliferating cell nuclear antigen), Ki-67 and BrdU of the gastric mucosa of the rats subjected to induction of chronic ulcer by 30% acetic acid.Animals were treated orally with 1% Tween-80 aqueous solution (control group), pantoprazole (40 mg/kg) or CIN (100 mg/kg) for 14 days. The filled arrow indicates the absence of the epithelial layer (ulcer area internal) and the dashed arrow indicates epithelial layer remaining (ulcer edge). Microphotographs depict the immunoreactivity for PCNA, Ki-67 and BrdU in the groups, magnification 200x (control) and 500x (CIN or pantoprazole).

Mentions: Immunohistochemical investigation using monoclonal antibodies against PCNA, Ki-67 and BrdU showed strong reactivity and a great quantity of PCNA- and Ki-67-positive nuclei (marked with dark reddish-brown color) and moderate reactivity for BrdU in the gastric mucosa of animals treated with CIN for 14 days, when compared to control group, in which there was no reactivity for the three markers due to the destruction of the epithelial layer, as shown in Fig 4. Treatment with pantoprazole was associated with a great quantity of PCNA-positive nuclei, moderate reactivity for Ki-67 and mild staining intensity of BrdU positive cells.


Gastroprotective Mechanisms of the Monoterpene 1,8-Cineole (Eucalyptol).

Rocha Caldas GF, Oliveira AR, Araújo AV, Lafayette SS, Albuquerque GS, Silva-Neto Jda C, Costa-Silva JH, Ferreira F, Costa JG, Wanderley AG - PLoS ONE (2015)

Immunohistochemical analysis for PCNA (proliferating cell nuclear antigen), Ki-67 and BrdU of the gastric mucosa of the rats subjected to induction of chronic ulcer by 30% acetic acid.Animals were treated orally with 1% Tween-80 aqueous solution (control group), pantoprazole (40 mg/kg) or CIN (100 mg/kg) for 14 days. The filled arrow indicates the absence of the epithelial layer (ulcer area internal) and the dashed arrow indicates epithelial layer remaining (ulcer edge). Microphotographs depict the immunoreactivity for PCNA, Ki-67 and BrdU in the groups, magnification 200x (control) and 500x (CIN or pantoprazole).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526535&req=5

pone.0134558.g004: Immunohistochemical analysis for PCNA (proliferating cell nuclear antigen), Ki-67 and BrdU of the gastric mucosa of the rats subjected to induction of chronic ulcer by 30% acetic acid.Animals were treated orally with 1% Tween-80 aqueous solution (control group), pantoprazole (40 mg/kg) or CIN (100 mg/kg) for 14 days. The filled arrow indicates the absence of the epithelial layer (ulcer area internal) and the dashed arrow indicates epithelial layer remaining (ulcer edge). Microphotographs depict the immunoreactivity for PCNA, Ki-67 and BrdU in the groups, magnification 200x (control) and 500x (CIN or pantoprazole).
Mentions: Immunohistochemical investigation using monoclonal antibodies against PCNA, Ki-67 and BrdU showed strong reactivity and a great quantity of PCNA- and Ki-67-positive nuclei (marked with dark reddish-brown color) and moderate reactivity for BrdU in the gastric mucosa of animals treated with CIN for 14 days, when compared to control group, in which there was no reactivity for the three markers due to the destruction of the epithelial layer, as shown in Fig 4. Treatment with pantoprazole was associated with a great quantity of PCNA-positive nuclei, moderate reactivity for Ki-67 and mild staining intensity of BrdU positive cells.

Bottom Line: CIN (100 mg/kg) reduced the volume of basal but not stimulated acid secretion.This findings demonstrate the role of 1,8-cineole as an important ulcer healing agent and indicate the involvement of antioxidant and cytoprotective mechanisms in the gastroprotective effect of compound.This study also provides evidence that 1,8-cineole is related to the gastroprotective effect of the essential oil of Hyptis martiusii.

View Article: PubMed Central - PubMed

Affiliation: Department of Pharmaceutical Sciences, Universidade Federal de Pernambuco, 50740-521, Recife, PE, Brazil.

ABSTRACT
Recently, our research group identified and reported 1,8-cineole (CIN), a monoterpene that naturally occur in many aromatic plants, as one of the major constituent of the essential oil from leaves of Hyptis martiusii (EOHM), as well as characterized the gastroprotective action of this oil. The aim of this study was to investigate the mechanisms of action involved in the antiulcer and healing activity of CIN, in order to confirm its correlation with the gastroprotective effect of EOHM. Wistar rats were exposed to different protocols (acute ulceration, gastrointestinal motility and antisecretory activity). In addition, were determinated the involvement of nitric oxide and sulphydryl groups; the levels of gastric mucus, lipid peroxidation, sulphydryl groups and myeloperoxidase activity. The healing ability was evaluated by acetic acid-induced chronic ulcer and histological and immunohistochemical analysis (PCNA, Ki-67 and BrdU). The treatment with CIN inhibited ethanol-, ethanol/HCl- and indomethacin-induced gastric lesions. The highest doses of CIN inhibited gastric emptying, but did not affect intestinal transit. CIN (100 mg/kg) reduced the volume of basal but not stimulated acid secretion. CIN increased levels of mucus (89.3%), prevented depletion of -SH groups (62.6%) and reduced the level of lipid peroxidation (55.3%) and myeloperoxidase activity (59.4%) in the gastric mucosa. In chronic ulcer model, CIN reduced in 43.1% the gastric area lesion, promoted significant regeneration and restoration of the levels of mucus in glandular cells as confirmed by histological analysis; and promoted increase in cell proliferation as evidenced by reactivity for PCNA, Ki-67 and BrdU. This findings demonstrate the role of 1,8-cineole as an important ulcer healing agent and indicate the involvement of antioxidant and cytoprotective mechanisms in the gastroprotective effect of compound. This study also provides evidence that 1,8-cineole is related to the gastroprotective effect of the essential oil of Hyptis martiusii.

No MeSH data available.


Related in: MedlinePlus