ABSTRACT
BACKGROUND: Currently, gastric cancer (GC) is considered a public health problem worldwide. Using medicinal plants for the prevention of chronic diseases such as cancer constitutes new alternatives in traditional medicine. Oenothera rosea (OR) could be an option, but it needs to be evaluated. AIM: The main objective of this study was to evaluate the protective effect of OR extract on N-methyl-N-nitrosourea (NMU)-induced GC in rats. METHODS: In total, 80 male Holtzman rats were randomized into five groups. Group A received the saline solution (5mL/kg), group B received NMU 500 µg/kg (cancer inductor) by oral administration for 16 weeks, and groups C, D, and E were treated with OR extract (100, 200, and 300 mg/kg, respectively) and NMU in order to evaluate the preventive effect on cancer induced by NMU for 16 weeks. Blood and histological samples of stomachs were collected to determine histopathological, biochemical, and hematological parameters between different experimental groups. RESULTS: Groups C, D, and E presented less histopathological changes such as anaplastic and hyperplastic cells, compared with group B. Hematological and biochemical parameters were recorded, and superoxide dismutase, malondialdehyde, and nitric oxide levels were statistically less than those of NMU group (P<0.05, P<0.01, and P<0.01). CONCLUSION: Considering the histopathological signs and the antioxidant activity in vivo as well as hematological and biochemical parameters of ethanolic extract of OR, we concluded that its administration in rats has a protective effect on GC, which is induced experimentally. This species could be studied in clinical trials for patients with GC in the future.
ABSTRACT
El tocosh es un producto alimenticio obtenido por una técnica de conservación andina y que tiene propiedades nutritivas y terapéuticas. Objetivo: Demostrar la capacidad antioxidante y el efecto citoprotector del tocosh de Solanum tuberosum æpapaÆ en la mucosa gástrica de animales de experimentación. Diseño: Experimental. Institución: Centro de Investigación de Bioquímica y Nutrición, Facultad de Medicina, Universidad Nacional Mayor de San Marcos, Lima, Perú. Material biológico: Tocosh seco y molido administrado a ratas albinas. Intervenciones: A 6 grupos de ratas albinas machos (200 ± 50 g) se les dividió en: (GI) solución NaCl 0,9 por ciento, 10 mL/kg; (GII) etanol al 70 por ciento a 10 mL/kg; (GIII, IV y V) Tocosh equivalente a 900 mg/kg, 1 800 mg/kg y 2 700 mg/kg, respectivamente, y (GVI) sucralfato 30 mg/kg. En todos los casos, una hora después se indujo injuria con etanol 70 grados a 10 mL/kg y por laparotomía abdominal se obtuvo el tejido gástrico. Principales medidas de resultados: Porcentaje de citoprotección gástrica en imagen digitalizada por image analysis software for plant disease quantification y capacidad antioxidante por lipoperoxidación método espectrofotométrico de la reacción de especies reactivas al ácido tiobarbitúrico (TBARS). Resultados: La marcha fitoquímica identificó compuestos fenólicos, alcaloides, triterpenoides y esteroides, azúcares reductores y aminoácidos libres como metabolitos secundarios. Las dosis de 2 700 mg/kg y 900 mg/kg resultaron en 0,72 y 1,81 nmol/g tejido de lipoperoxidación, respectivamente. La dosis de 1 800 mg/kg protegió un 97 por ciento del área de la mucosa gástrica, 2 700 mg/kg un 95 por ciento y la de 900 mg/kg, 88 por ciento (p<0,05). La dosis de 1 800 mg/kg exhibió mejor efecto citoprotector y la de 2 700 mg/kg mejor actividad antioxidante, comparada con sucralfato 30 mg/kg. Conclusiones: El tocosh de Solanum tuberosum æpapaÆ tuvo efecto citoprotector y actividad antioxidante...
Tocosh is a nutritious product obtained by an Andean preservation technique with nutritive and therapeutic properties. Objective: To demonstrate antioxidant and cytoprotector effects of Solanum tuberosum æpapaÆ tocosh in the gastric mucosa of experimental animals. Design: Experimental. Institution: Biochemistry and Nutrition Research Center, Faculty of Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru. Biologic material: Dry and grounded administered to albino rats. Interventions: Six groups of male albino rats (200 ± 50 g) were divided in: (GI) NaCl 0.9 per cent solution, 10 mL/kg; (GII) ethanol 70 per cent 10 mL/kg; (GIII, IV y V) Tocosh equivalent to 900 mg/kg, 1 800 mg/kg, and 2 700 mg/kg respectively, and (GVI) sucralfate 30 mg/kg. One hour after, in all cases injury with ethanol 70 degrees 10 mL/kg was induced and gastric tissue was obtained by abdominal laparotomy. Main outcome measures: Percentage of gastric cytoprotection in digitalized image by image analysis software for plant disease quantification, and antioxidant ability by lipoperoxidation spectrophotometric method of reactive species reaction to thiobarbituric acid (TBARS). Results: The phytochemist progress identified phenolic compounds, alcaloids, triterpenoids and steroids, reducing sugars and free aminoacids as secondary metabolites. The 2 700 mg/kg and 900 mg/kg doses resulted respectively in 0.72 and 1.81 nmol/g lipoperoxidation tissue. The 1800 mg/kg doses protected 97 per cent of the gastric mucosa, 2 700 mg/kg 95 per cent and the 900 mg/kg, 88 per cent (p<0.05). The 1 800 mg/kg doses exhibited better cytoprotector effect and the 2 700 mg/kg doses better antioxidant activity, compared with sucralfate 30 mg/kg. Conclusions: Solanum tuberosum æpapaÆ tocosh showed cytoprotector effect and antioxidant activity...
