Browsing by Author "Lanzarin, Germano"
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- Dietary supplementation with chestnut (Castanea sativa) reduces abdominal adiposity in FVB/n mice: a preliminary studyPublication . Rodrigues, Pedro M.; Ferreira, Tiago; Nascimento-Gonçalves, Elisabete; Seixas, Fernanda; Costa, Rui Miguel Gil; Martins, Tânia; Neuparth, Maria João; Pires, Maria João; Lanzarin, Germano; Félix, Luís; Venâncio, Carlos; Ferreira, Isabel C.F.R.; Bastos, Margarida M.S.M.; Medeiros, Rui; Gaivão, Isabel; Rosa, Eduardo; Oliveira, Paula A.The production of chestnut (Castanea sativa Miller) is mostly concentrated in Europe. Chestnut is recognized by its high content of antioxidants and phytosterols. This work aimed to evaluate the e ects of dietary chestnut consumption over physiological variables of FVB/n mice. Eighteen FVB/n male 7-month-old mice were randomly divided into three experimental groups (n = 6): 1 (control group) fed a standard diet; 2 fed a diet supplemented with 0.55% (w/w) chestnut; and 3 supplemented with 1.1% (w/w) chestnut. Body weight, water, and food intake were recorded weekly. Following 35 days of supplementation, the mice were sacrificed for the collection of biological samples. Chestnut supplementation at 1.1% reduced abdominal adipose tissue. Lower serum cholesterol was also observed in animals supplemented with chestnut. There were no significant di erences concerning the incidence of histological lesions nor in biochemical markers of hepatic damage and oxidative stress. These results suggest that chestnut supplementation may contribute to regulate adipose tissue deposition.
- Exploring the Chemopreventive and Antioxidant Effects of Spearmint Leaf Hydroethanolic Extract in HPV16-transgenic MicePublication . Jesus, Tiago M.; Azevedo, Tiago; Silva-Reis, Rita; Ferreira, Tiago; Nascimento-Gonçalves, Elisabete; Medeiros, Catarina; Ferreira, João; Gama, Adelina; Gaivão, Isabel; Pires, Maria João; Lanzarin, Germano; Félix, Luís; Venância, Carlos; Medeiros, Rui; Bastos, Margarida M.S.M.; Finimundy, Tiane C.; Barros, Lillian; Costa, Rui M. Gil da; Oliveira, Paula A.Human papillomavirus (HPV) is the most common sexually transmitted infectious agent and, in cases of persistent infection, may cause cancer. This study evaluated the toxicological and antitumor properties of Mentha spicata extract (MSE) in KP14HPV16 mice, which carry HPV16 oncogenes. Thirty‑three female FVB/n mice (Mus musculus), including 17 HPV‑transgenic and 16 wild‑type (WT) mice, were divided into six groups. The control groups received tap water (WT‑C, n=5, and HPV‑C, n=6), while the treatment groups received either 0.50 mg/ml MSE (WT‑50 and HPV‑50, n=6) or 0.55 mg/ml MSE (WT‑55 and HPV‑55, n=5) in drinking water for 28 days. Afterwards, animals were sacrificed, and blood and organs were collected for histopathological and biochemical analysis. The main phenolic compounds in MSE were rosmarinic acid and luteolin‑O‑glucoronide. MSE did not significantly affect weight gain in WT mice; however, WT‑55 gained significantly more weight than HPV‑55. MSE demonstrated antioxidant activity as indicated by the modulation of hepatic superoxide dismutase and glutathione S‑transferase (GST) activity, as well as renal GST activity, in MSE‑treated HPV groups. MSE did not reduce histological lesion incidence or systemic inflammation in HPV16‑transgenic mice. In general, while MSE was safe and exhibited antioxidant activity, it did not significantly impact HPV16‑induced lesions, warranting further research to assess systemic effects with different concentrations and durations.
- The anti-tumour effect of spearmint (Mentha spicata) in a HPV-16-transgenic mouse modelPublication . Jesus, T.M.; Silva-Reis, Rita; Pires, Maria João; Lanzarin, Germano; Félix, Luís; Venâncio, Carlos; Costa, Rui Miguel Gil; Bastos, Margarida M.S.M.; Medeiros, Rui; Nogueira, António José M.; Barros, Lillian; Ferreira, Isabel C.F.R.; Rosa, Eduardo; Oliveira, Paula A.Infection by Human Papillomavirus (HPV) is the main cause of cervical cancer, highlighting the importance of studying compounds that may reduce viral activity and its lesions/symptoms. The aromatic herb spearmint (Mentha spicata) (MS) has proven anti-tumour properties 1. Thus, this study aimed to evaluate the effects of an hydroethanolic extract obtained from spearmint in HPV16-transgenic (HPV+/-) mice. The extract was obtained through maceration with ethanol/water (80:20, v/v), and the phenolic composition was determined through HPLC-DAD-ESI/MS. A total of thirteen compounds were identified in the hydroethanolic extract, being salvianolic acid B, rosmarinic acid and luteolin-7-O-glucuronide, the main compounds found. Moreover, the compounds revealed to be stable in the drinking water during the 5 tested days. Results show that HPV+/- (GIV, V and VI) have lower weight but higher water and food intake, as expected. Analysis of HPV+/- mice GIV showed a significant increase of superoxide dismutase activity when compared with GV (p=0.0029) and VI (p=0.0011). This suggests that group IV was subjected to a higher oxidative stress, as expected1. These results could also mean that MS is responsible for a decrease in the oxidative stress known to be induced by HPV, which in turn decreases SOD, further the role of MS as an antioxidant. Regarding genetic damage, no statistically significant changes between groups were found in the comet and micronucleus assays, implying that spearmint has no influence on genotoxicity at the concentrations employed. There were no significant differences concerning basal DNA damage between WT and transgenic individuals as seen in other studies 2. Further studies are required to clarify the antioxidant and antigenotoxic effects of spearmint.
- The anti-tumour effect of spearmint (Mentha spicata) in a HPV-16-transgenic mouse modelPublication . Jesus, T.M.; Silva-Reis, Rita; Pires, Maria João; Lanzarin, Germano; Félix, Luís; Venâncio, Carlos; Costa, Rui Miguel Gil; Bastos, Margarida M.S.M.; Medeiros, Rui; Nogueira, António José M.; Barros, Lillian; Ferreira, Isabel C.F.R.; Rosa, Eduardo; Oliveira, Paula A.Infection by Human Papillomavirus (HPV) is the main cause of cervical cancer, highlighting the importance of studying compounds that may reduce viral activity and its lesions/symptoms. The aromatic herb spearmint (Mentha spicata) (MS) has proven anti-tumor properties [1]. Thus, this study aimed to evaluate the effects of an hydroethanolic extract obtained from spearmint in HPV16-transgenic (HPV+/-) mice. The extract was obtained through maceration with ethanol/water (80:20, v/v), and the phenolic composition was determined through HPLC-DAD-ESI/MS. Thirty-three female mice (16 HPV-/- and 17 HPV+/-) were randomly divided into six groups: Group (G) I – HPV-/- w/o Mentha (n=5); G II – HPV-/- w/ Mentha (0.5 mg/ml; n=6); G III – HPV-/- w/ Mentha (0.55 mg/ml; n=5); G IV – HPV+/- w/o Mentha (n=6); G V – HPV+/- w/ Mentha (0.5 mg/ml; n=6); G VI – HPV+/- w/ Mentha (0.55 mg/ml; n=5). The spearmint extract was administered in the animal’s drinking water for 28 days. During the study, water and food intake as well the animals’ weights were recorded weekly. Afterwards, the animals were sacrificed, and their organs were collected for oxidative stress and genetic damage analysis. A total of thirteen compounds were identified in the hydroethanolic extract, being salvianolic acid B, rosmarinic acid and luteolin-7-O-glucuronide, the main compounds found. Moreover, the compounds revealed to be stable in the drinking water during the 5 tested days. Results show that HPV+/- (GIV, V and VI) have lower weight but higher water and food intake, as expected. Analysis of HPV+/- mice GIV showed a significant increase of superoxide dismutase activity when compared with GV (p=0.0029) and VI (p=0.0011). This suggests that group IV was subjected to a higher oxidative stress, as expected. These results could also mean that MS is responsible for a decrease in the oxidative stress known to be induced by HPV, which in turn decreases SOD, further the role of MS as an antioxidant. Regarding genetic damage, no statistically significant changes between groups were found in the comet and micronucleus assays, implying that spearmint has no influence on genotoxicity at the concentrations employed. There were no significant differences concerning basal DNA damage between WT and transgenic individuals as seen in other studies [2]. Further studies are required to clarify the antioxidant and antigenotoxic effects of spearmint.
- Therapeutic properties of Tilia platyphyllos Scop. in K14HPV16 micePublication . Ferreira, Tiago; Nascimento-Gonçalves, Elisabete; Gama, Adelina; Costa, Rui Miguel Gil; Neuparth, Maria João; Lanzarin, Germano; Venâncio, Carlos; Félix, Luís; Pires, Maria João; Nogueira, António José M.; Barros, Lillian; Ferreira, Isabel C.F.R.; Rosa, Eduardo; Oliveira, Paula A.Tila platyphyllos Scop. is a popular broad-leave tree, native to central and southern Europe
- Toxicological and anti-tumor effects of a linden extract (Tilia platyphyllos Scop.) in a HPV16-transgenic mouse modelPublication . Patwal, Tiago; Nascimento-Gonçalves, Elisabete; Macedo, Sara; Borges, Inês; Gama, Adelina; Costa, Rui Miguel Gil; Neuparth, Maria João; Lanzarin, Germano; Venâncio, Carlos; Félix, Luís; Gaivão, Isabel; Alvarado, Antonieta; Pires, Maria João; Bastos, Margarida M.S.M.; Medeiros, Rui; Nogueira, António José M.; Barros, Lillian; Ferreira, Isabel C.F.R.; Rosa, Eduardo; Oliveira, Paula A.Tilia platyphyllos Scop. is a popular broad-leaved tree, native to Central and Southern Europe. Hydroethanolic extracts rich in phenolic compounds obtained from T. platyphyllos Scop. have shown in vitro antioxidant, anti-inflammatory and antitumor properties. The aim of this work was to evaluate the therapeutic properties of a hydroethanolic extract obtained from T. platyphyllos in HPV16-transgenic mice. The animals were divided into eight groups according to their sex and phenotype. Four groups of female: HPV+ exposed to linden (HPV linden; n = 6), HPV+ (HPV water; n = 4), HPV- exposed to linden (WT linden; n = 5) and HPV- (WT water; n = 4) and four groups of male: HPV+ exposed to linden (HPV linden; n = 5), HPV+ (HPV water; n = 5), HPV- exposed to linden (WT linden; n = 5) and HPV- (WT water; n = 7). The linden (Tilia platyphyllos Scop.) extract was orally administered at a dose of 4.5 mg/10 mL per animal (dissolved in water) and changed daily for 33 days. The hydroethanolic extract of T. platyphyllos consisted of protocatechuic acid and (-)-epicatechin as the most abundant phenolic acid and flavonoid, respectively, and was found to be stable during the studied period. In two male groups a significant positive weight gain was observed but without association with the linden extract. Histological, biochemical, and oxidative stress analyses for the evaluation of kidney and liver damage support the hypothesis that the linden extract is safe and well-tolerated under the present experimental conditions. Skin histopathology does not demonstrate the chemopreventive effect of the linden extract against HPV16-induced lesions. The linden extract has revealed a favourable toxicological profile; however, additional studies are required to determine the chemopreventive potential of the linden extract. This journal is