[Objective] This study aimed to investigate the effects of different mulberry extracts on sex hormone and hypothalamic neurotransmitter in naturally aged female rats and reveal the mechanism and material basis of anti...[Objective] This study aimed to investigate the effects of different mulberry extracts on sex hormone and hypothalamic neurotransmitter in naturally aged female rats and reveal the mechanism and material basis of anti-aging effect of mulberry. [ Method] Fourteen-month-old SD female rats were selected and ran- domly divided into model group, positive control group, high-dose and low-dose water extract groups, high-dose and low-dose 50% ethanol extract groups, and high-dose and low-dose 95% ethanol extract groups; four-month-old SD female rats were used as blank control group. After eight weeks of drug administration, the levels of 17β-estradiol （E2 ）, follicle- stimulating hormone （FSH） and luteinizing hormone （LH） in serum and beta-endorphin （β-EP） in hypothalamus were de- termined by radioimmunoassay; the levels of norepinephrine （ NE）, dopamine （ DA）, 5-hydroxy tryptamine （5-HT） and 5-HIAA in hypothalamus were determined by fluorescence spectrometry. [ Result] Water extract of mulberry can increase the level of E2 and reduce levels of FSH and LH in serum, and increase the level of fl-EP and reduce levels of DA, 5-HT and 5-HIAA in hypothalamus of naturally aged female rats. Water extract of mulberry exhibited higher effects than 50% eth- anol extract and 95% ethanol extract. [ Conclusion] Mulberry could significantly improve the function of hypothalamic peptide neurotransmitter in naturally aged rats, correct disorders of hypothalamic monoamine neurotransmitter, and treat perimenopausal syndrome by regulating reproductive endocrine function, which might be related with its water-soluble components and require further investigation and development.展开更多
AIM:To investigate the therapeutic effect of natural extract eye drops containing bee venom,musk,and deer antlers in dry eye disease(DED)animal models.METHODS:Scopolamine-injected DED rats and lacrimal gland-excised r...AIM:To investigate the therapeutic effect of natural extract eye drops containing bee venom,musk,and deer antlers in dry eye disease(DED)animal models.METHODS:Scopolamine-injected DED rats and lacrimal gland-excised rats were allocated into control,saline,and natural extract groups respectively and a normal group(lacrimal gland excision was not performed)in lacrimal gland-excised rats.After eye drop instillation 4 times a day for 5 d,corneal fluorescein staining(CFS)scores,tear MUC5AC levels,and tear lactic dehydrogenase(LDH)levels were measured.RESULTS:In scopolamine-injected rats,the natural extract-treated group had significantly lower CFS scores(1.7±0.5,4.7±1.4,3.8±1.9,P=0.006)and tear LDH levels(0.10±0.01,0.19±0.01,0.16±0.08 OD,P=0.014)but higher tear MUC5AC levels(12.9±3.7,7.9±2.0,9.7±3.6 ng/m L,P=0.041)compared with the control and saline-treated groups.There were no significant differences between the control and saline-treated groups.In lacrimal gland-excised rats,the natural extract-treated group also had lower CFS scores(4.3±1.2,11.5±2.3,9.0±1.9,P<0.001,P=0.001)and tear LDH levels(0.30±0.08,0.48±0.12,0.39±0.05 OD,P<0.05)but higher tear volume(4.3±0.9,1.9±0.7,2.8±1.1 mm,P=0.005,P=0.124)and tear MUC5 AC levels(8.2±2.0,2.9±1.2,5.4±2.2 ng/m L,P<0.001,P=0.047)compared with the control and saline-treated groups.There were no significant differences in the CFS scores,tear MUC5AC level,and tear LDH level between the normal and natural extracttreated groups.CONCLUSION:The natural extract consisting of bee venom,musk,and deer antlers may have effectiveness in DED treatment by restoring the damaged ocular surface,increasing tear volume,and recovering the tear mucin layer in DED rats.展开更多
Objective:To review treatment methods using natural extracts applied in rat models of periodontitis to establish a direction for the design of future experiments.Methods:An electronic search of PubMed was carried out ...Objective:To review treatment methods using natural extracts applied in rat models of periodontitis to establish a direction for the design of future experiments.Methods:An electronic search of PubMed was carried out using the keywords“periodontitis,”“natural”,“extracts”,“herb*”,“plants”and“rats.”Articles were screened against inclusion and exclusion criteria by two independent researchers.Data describing the characteristics of rats,method of periodontitis inducement,extract administration,and outcome measures were extracted and analyzed by more than two authors manually.Results:Of the 864 articles identified,33 studies were included.The use of SpragueeDawley rats(51.2%)and male rats(90.9%)was preferred.The most common experimental methods were ligature placement(72.7%)and oral administration(66.7%).Alveolar bone loss was evaluated mainly by photography(51.5%)and micro-computed tomography(39.4%).Factors related to bone remodeling and inflammatory processes,such as interleukin-1b,tumor necrosis factor-a,receptor activator of nuclear factor-kB,and osteoprotegerin,were also measured.Conclusion:Many diverse experimental periodontitis models have been used.However,few articles observed bone formation,immune responses,antibacterial effects,and toxicity.Future studies to assess natural extracts for the treatment of periodontitis should be robust and well-designed.展开更多
Astrocytes are implicated in the pathological changes of Alzheimer's disease. Our previous studies have demonstrated that estrogen deprivation and oxidative stress act synergistically to accelerate the progress of...Astrocytes are implicated in the pathological changes of Alzheimer's disease. Our previous studies have demonstrated that estrogen deprivation and oxidative stress act synergistically to accelerate the progress of Alzheimer's disease. Long-term D-galactose injection combined with ovariectomy may serve as a rodent model for Alzheimer's disease. To address the potential contribution of astroglia to the Alzheimer's disease pathogenesis, we investigated pathological and biochemical alterations of astrocytes under this animal model. Ovadectomized rats injected with D-galactose for 2 weeks showed extensive localization of glial fibrillary acidic protein immunoreactive astrocytes and slightly elevated glutathione levels in the hippocampus without significant impairments in the water maze test and deficits of the cholinergic analyses, compared to the saline-injected rats. Ovariectomized rats injected with D-galactose for 6 weeks, however, exhibited degeneration of astrocytes and decreased glutathione levels in the hippocampus, accompanied with severe dysfunction of behavioral test and deficiency of cholinergic terminals. Electron microscopy further confirmed the pathological changes of astrocytes, especially in the aggregated area of synapse and brain microvessels. Consistent with degeneration of perivascular astrocytic endfeet, analysis of the horseradish peroxidase demonstrated an impairment of the blood-brain barrier permeability. These findings indicate that biochemical and pathological alterations of astrocytes may partially contribute to exacerbating neuronal deficits in the course of Alzheimer's disease. Restoring neuroprotective potential of astrocytes may be a useful therapeutic target for Alzheimer's disease and other neurodegenerative diseases.展开更多
文摘[Objective] This study aimed to investigate the effects of different mulberry extracts on sex hormone and hypothalamic neurotransmitter in naturally aged female rats and reveal the mechanism and material basis of anti-aging effect of mulberry. [ Method] Fourteen-month-old SD female rats were selected and ran- domly divided into model group, positive control group, high-dose and low-dose water extract groups, high-dose and low-dose 50% ethanol extract groups, and high-dose and low-dose 95% ethanol extract groups; four-month-old SD female rats were used as blank control group. After eight weeks of drug administration, the levels of 17β-estradiol （E2 ）, follicle- stimulating hormone （FSH） and luteinizing hormone （LH） in serum and beta-endorphin （β-EP） in hypothalamus were de- termined by radioimmunoassay; the levels of norepinephrine （ NE）, dopamine （ DA）, 5-hydroxy tryptamine （5-HT） and 5-HIAA in hypothalamus were determined by fluorescence spectrometry. [ Result] Water extract of mulberry can increase the level of E2 and reduce levels of FSH and LH in serum, and increase the level of fl-EP and reduce levels of DA, 5-HT and 5-HIAA in hypothalamus of naturally aged female rats. Water extract of mulberry exhibited higher effects than 50% eth- anol extract and 95% ethanol extract. [ Conclusion] Mulberry could significantly improve the function of hypothalamic peptide neurotransmitter in naturally aged rats, correct disorders of hypothalamic monoamine neurotransmitter, and treat perimenopausal syndrome by regulating reproductive endocrine function, which might be related with its water-soluble components and require further investigation and development.
基金Supported in part by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(No.2018R1C1B6002794)Korea University Grant(No.K1625491+2 种基金No.K1722121,No.K1811051No.K1913161No.K2010921)。
文摘AIM:To investigate the therapeutic effect of natural extract eye drops containing bee venom,musk,and deer antlers in dry eye disease(DED)animal models.METHODS:Scopolamine-injected DED rats and lacrimal gland-excised rats were allocated into control,saline,and natural extract groups respectively and a normal group(lacrimal gland excision was not performed)in lacrimal gland-excised rats.After eye drop instillation 4 times a day for 5 d,corneal fluorescein staining(CFS)scores,tear MUC5AC levels,and tear lactic dehydrogenase(LDH)levels were measured.RESULTS:In scopolamine-injected rats,the natural extract-treated group had significantly lower CFS scores(1.7±0.5,4.7±1.4,3.8±1.9,P=0.006)and tear LDH levels(0.10±0.01,0.19±0.01,0.16±0.08 OD,P=0.014)but higher tear MUC5AC levels(12.9±3.7,7.9±2.0,9.7±3.6 ng/m L,P=0.041)compared with the control and saline-treated groups.There were no significant differences between the control and saline-treated groups.In lacrimal gland-excised rats,the natural extract-treated group also had lower CFS scores(4.3±1.2,11.5±2.3,9.0±1.9,P<0.001,P=0.001)and tear LDH levels(0.30±0.08,0.48±0.12,0.39±0.05 OD,P<0.05)but higher tear volume(4.3±0.9,1.9±0.7,2.8±1.1 mm,P=0.005,P=0.124)and tear MUC5 AC levels(8.2±2.0,2.9±1.2,5.4±2.2 ng/m L,P<0.001,P=0.047)compared with the control and saline-treated groups.There were no significant differences in the CFS scores,tear MUC5AC level,and tear LDH level between the normal and natural extracttreated groups.CONCLUSION:The natural extract consisting of bee venom,musk,and deer antlers may have effectiveness in DED treatment by restoring the damaged ocular surface,increasing tear volume,and recovering the tear mucin layer in DED rats.
基金supported by Kyung Hee University(Seoul,Republic of Korea)in 2018(KHU-20180922).
文摘Objective:To review treatment methods using natural extracts applied in rat models of periodontitis to establish a direction for the design of future experiments.Methods:An electronic search of PubMed was carried out using the keywords“periodontitis,”“natural”,“extracts”,“herb*”,“plants”and“rats.”Articles were screened against inclusion and exclusion criteria by two independent researchers.Data describing the characteristics of rats,method of periodontitis inducement,extract administration,and outcome measures were extracted and analyzed by more than two authors manually.Results:Of the 864 articles identified,33 studies were included.The use of SpragueeDawley rats(51.2%)and male rats(90.9%)was preferred.The most common experimental methods were ligature placement(72.7%)and oral administration(66.7%).Alveolar bone loss was evaluated mainly by photography(51.5%)and micro-computed tomography(39.4%).Factors related to bone remodeling and inflammatory processes,such as interleukin-1b,tumor necrosis factor-a,receptor activator of nuclear factor-kB,and osteoprotegerin,were also measured.Conclusion:Many diverse experimental periodontitis models have been used.However,few articles observed bone formation,immune responses,antibacterial effects,and toxicity.Future studies to assess natural extracts for the treatment of periodontitis should be robust and well-designed.
文摘Astrocytes are implicated in the pathological changes of Alzheimer's disease. Our previous studies have demonstrated that estrogen deprivation and oxidative stress act synergistically to accelerate the progress of Alzheimer's disease. Long-term D-galactose injection combined with ovariectomy may serve as a rodent model for Alzheimer's disease. To address the potential contribution of astroglia to the Alzheimer's disease pathogenesis, we investigated pathological and biochemical alterations of astrocytes under this animal model. Ovadectomized rats injected with D-galactose for 2 weeks showed extensive localization of glial fibrillary acidic protein immunoreactive astrocytes and slightly elevated glutathione levels in the hippocampus without significant impairments in the water maze test and deficits of the cholinergic analyses, compared to the saline-injected rats. Ovariectomized rats injected with D-galactose for 6 weeks, however, exhibited degeneration of astrocytes and decreased glutathione levels in the hippocampus, accompanied with severe dysfunction of behavioral test and deficiency of cholinergic terminals. Electron microscopy further confirmed the pathological changes of astrocytes, especially in the aggregated area of synapse and brain microvessels. Consistent with degeneration of perivascular astrocytic endfeet, analysis of the horseradish peroxidase demonstrated an impairment of the blood-brain barrier permeability. These findings indicate that biochemical and pathological alterations of astrocytes may partially contribute to exacerbating neuronal deficits in the course of Alzheimer's disease. Restoring neuroprotective potential of astrocytes may be a useful therapeutic target for Alzheimer's disease and other neurodegenerative diseases.
