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At least 19 recordsLinked to original sources

PubMed2002

[Community characteristics of Hippophae rhamnoides forest and water and nutrient condition of the woodland in Loess hilly region].

To improve the productivity of Hippophae rhamnoides forest and to manage the forest reasonably, the community characteristics of Hippophae rhamnoides and the water and nutrient condition of the woodland were analyzed. The results showed that Hippophae rhamnoides grew fast and its adaptability was strong. 4-5 years old Hippophae rhamnoides could form shrubs-grass community. The biomass 1-8 years old Hippophae rhamnoides increased rapidly, but that of 8-11 years old increased more slowly. Hippophae rhamnoides older than 11 years could keep reasonable community structure and higher primary productivity by natural thinning. The utilization of soil moisture by Hippophae rhamnoides could be classified into four layers as faint utilization layer of root system (0-20 cm), utilization of root system (20-300 cm), adjustment layer supplied by soil moisture (300-400 cm), and faint adjustment layer (400-500 cm). Due to the soil improvement by Hippophae rhamnoides and the water retaining by litter, the soil moisture of 1-1.5 m layer could be easy to restore. Hippophae rhamnoides could keep the balance of nutrition in the woodland through the fixation of nitrogen by root nodule and the decomposition of litter. In the 6-9 years old Hippophae rhamnoides plantation, the total nitrogen content of soil might be improved from 0.05-0.1% to 0.2%.

Biomass↗

PubMed2004

[A comparative study on water use characteristics and eco-adaptability of Hippophae rhamnoides and Caragana korshinskii in semi-arid loess hilly-gully region].

This study compared the seasonal dynamics of soil water content, biomass productivity, and leaf photosynthetic physiology and water potential between about ten years old Hippophae rhamnoides and Caragana korshinskii planted on the hilly slope land of semi-arid loess hilly-gully region. The results showed that there existed dry soil layer in the stands. The seasonal compensation depth of soil water in Hippophae rhamnoides stand was deeper and its water use capability was better than those of C. korshinskii. The yearly productivity of Hippophae rhamnoides was about 2.56 times of C. korshinskii. Hippophae rhamnoides leaf had an increased water use efficiency under improved soil water condition. C. korshinskii had higher photosynthetic and transpiration rates, but its leaf WUE was smaller than Hippophae rhamnoides. These two forests all had drought resistance and tolerance characteristics, but Hippophae rhamnoides was more active than C. korshinskii adapting to drought.

Adaptation, Physiological↗

PubMed2005

Chemoprevention by Hippophae rhamnoides: effects on tumorigenesis, phase II and antioxidant enzymes, and IRF-1 transcription factor.

Fruits or berries of Hippophae rhamnoides (sea buckthorn), a rich source of vitamins A, C, and E, carotenes, flavonoids, and microelements such as sulfur, selenium, zinc, and copper, are edible and have been shown to protect from atopic dermatitis, hepatic injury, cardiac disease, ulcer, and atherosclerosis. However, its mechanism of action is not clear. We show that Hippophae inhibits benzo(a)pyrene-induced forestomach and DMBA-induced skin papillomagenesis in mouse. This decrease in carcinogenesis may be attributed to the concomitant induction of phase II enzymes such as glutathione S-transferase and DT-diaphorase and antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase in the mouse liver. This was accompanied by a remarkable induction of the transcription factor interferon regulatory factor-1 in the Hippophae-treated liver. Our results strongly suggest that Hippophae fruit is able to decrease carcinogen-induced forestomach and skin tumorigenesis, which might involve up-regulation of phase II and antioxidant enzymes as well as DNA-binding activity of IRF-1, a known antioncogenic transcription factor causing growth suppression and apoptosis induction for its anticancer effect.

9,10-Dimethyl-1,2-benzanthracene↗

PubMed2006

[Management of burn wounds with Hippophae rhamnoides oil].

OBJECTIVE: To observe the therapeutic effects of Hippophae rhamnoides oil, a preparation of traditional Chinese herbal medicine derived from the fruits of sea buckthorn, on the wounds in burn patients. METHODS: Hippophae rhamnoides oil dressing was applied on the burn wounds as an inner dressing and covered by disinfecting dressing. The oil dressing was changed every other day until wound healing. RESULTS: Totally 151 burned patients received the treatment with Hippophae rhamnoides oil dressing, which obviously alleviated the swelling and effusion of the wounds and relieved the pains. Compared with the control patients (treated with vaseline gauze), patients receiving the dressing showed more obvious exudation reduction, pain relief, and faster epithelial cell growth and wound healing, with statistically significant difference between the two groups. CONCLUSION: As a valuable plant oil with wide uses in medicine, Hippophae rhamnoides oil for external application has definite effects on the healing of burn wounds.

Adolescent↗

PubMed1992

[The protective effect of Hippophae rhamnoides L. on hyperlipidemic serum cultured smooth muscle cells in vitro].

The effect of Hippophae rhamnoides on hyperlipidemic rabbit serum (HRS) cultured smooth muscle cells (SMC) was observed in comparison with vitamin E(VE). The results show that Hippophae rhamnoides, much like VE, is also a potent antioxidant. It strongly decreases the MDA content in HRS cultured SMC and protect the cells from the injury of lipid peroxidation, and thus keeps the SMC growing and proliferating health. The results implicate that Hippophae rhamnoides is an effective antioxidant, and one of the important mechanisms of Hippophae rhamnoides in anti-atherosclerosis reported recently may be closely related to the action of anti-lipid peroxidation.

Antioxidants↗

PubMed2003

[The protection of seed oil of Hippophae rharmnoides on ischemic cerebral infarction in rats].

OBJECTIVE: To study the protection of seed oil of Hippophae rhamnoides on ischemic cerebral infarction in rats and the mechanism of the action. METHOD: Focal cerebral ischemia model was made by middle cerebral artery occlusion(MCAO) in rats. Behavior obstacles of rats were observed. Cerebral infarction volume was determined by Megnetic Resonance Imaging(MRI). RESULT: Seed oil of Hippophae rhamnides 0.7 and 0.35 g.kg-1 could markedly reduce infarction volume after occlusion of middle cerebral artery in rats and also could ameliorate the behavior obstacles of rats. CONCLUSION: These results suggested that seed oil of Hippophae rhamnoides had distinct protection to ischemic cerebral infarction in rats.

Animals↗

PubMed1998

[Determination of ascorbic acid and its stability of Fructus Hippophae fruit by the method of high-valence iron reduction].

The high-valence iron reduction method was used to determine the ascorbic acid of fructus hippophae fruit. The reduction method had simple, high sensitivity and accuracy in comparison with fluorospectrophotometry or indophenol titration method. Its limit of detection was 0.01 microg/mL, the relative standard deviation and the average recovery was 0.83% (n = 8) and 95.6% (n = 6) respectively. We also researched the influence of the environment factors (temperature, storage period and condition, pH value) on the stability of ascorbic acid in fructus hippophae fruit. The ascorbic acid in fructus hippophae fruit was more stable than thepure ascorbic acid on the same condition of heating (80 C,1 hour), in pH neutral or storing in the refrigerator.

Ascorbic Acid↗

PubMed2003

Induction of DNA-protein cross-links by Hippophae rhamnoides: implications in radioprotection and cytotoxicity.

Recently Hippophae rhamnoides has been reported to render chromatin compaction and significantly inhibit radiation induced DNA strand breaks. To investigate the mechanism of action of RH-3, a preparation of Hippophae rhamnoides, in this connection, present study was undertaken. Chromatin compaction induced by RH-3 (100 microg/ml or more) was maximum at alkaline pH but was completely negated by acidic pH (< 6) or presence of free radical scavengers like glycerol, DMSO etc. In a concentration dependent manner, RH-3 inhibited the intercalation of ethidium ions from Et Br into calf thymus DNA and also increased the precipitation of DNA-protein cross-links (DPC) in thymocytes. Chromatin compaction caused by RH-3 treatment did not permit the separation of proteins from DNA even after treatment with 2 M NaCl solution. SDS-PAGE profiles also revealed that RH-3 in a dose dependent manner compacted the chromatin organization, induced DPC and inhibited the extraction of both histone and non-histone matrix proteins from chromatin maximally at 80 microg/ml. More than 80 microg/ml of RH-3, though extracted low molecular weight histones but did not separate non-histone proteins. The RH-3 mediated DPCs were resistant even to 1% SDS, 4 M NaCl and 3.8 M hydroxyl amine hydrochloride but were prone to both urea (8 M) and guanidine hydrochloride (6 M) indicating covalent bonding between DNA and proteins (serine/threonine). RH-3 in a concentration dependent manner induced superoxide anions and the phenomenon was dependent upon nature of medium, presence of metal ions and pH. RH-3 at concentrations up to 100 microg/ml in presence of 50 microM copper sulfate inflicted significant damage to extraneously added 2-deoxyribose molecules and maximum TBARS were formed at a concentration of 100 microg/ml. Higher concentrations of RH-3 more than 100 microg/ml quenched free radicals and inhibited 2-deoxyribose degradation. RH-3 also induced strand breaks in plasmid DNA at concentrations lower than 100 microg/ml but completely inhibited at concentrations higher than 250 microg/ml, indicating bimodal function. Strand breaks induced by lower concentrations of RH-3 (up to 100 microg/ml) were inhibited by antioxidants like GSH, DFR etc. RH-3, in a concentration dependent mode also inhibited the relaxation of supercoiled plasmid DNA (PBR322) by topoisomerase I. Present study indicated that RH-3 caused compaction of reversible (< 100 micrpg/ml) and irreversible (> 100 microg/ml) nature which was related to the magnitude of DNA-protein cross-links formed. Maintenance of chromatin organization, induction of hypoxia, hydrogen atom donation, free radical scavenging and blocking of cell cycle at G2-M phase by interfering with topoisomerase I activity seem to contribute towards the radioprotective efficacy of RH-3.

Animals↗

PubMed2004

Molecular genetic variation in Chinese populations of three subspecies of Hippophae rhamnoides.

To provide a population-level genetic profile for investigation and conservation of genetic diversity of the sea buckthorn (Hippophae rhamnoides L.), 300 individuals of fifteen natural populations of sea buckthorn in China were analyzed by using ISSR (inter-simple sequence repeats) markers. On the basis of Shannon's index and Nei's genetic diversity, the mean genetic diversity detected in the natural populations of Hippophae rhamnoides ssp. yunnanensis, ssp. sinensis, and ssp. gyantsensis was 0.1944, 0.2169, and 0.1372, respectively. The coefficient of gene differentiation (Gst) of seven ssp. yunnanensis populations is 0.2790, and that of seven ssp. sinensis populations is 0.4184. This means that 28% of the total molecular variance of seven ssp. yunnanensis populations existed among populations, and 42% for seven ssp. sinensis populations, suggesting that the subspecies have different genetic structures. No significant correlation between genetic and geographic distances of the populations was found using ISSR markers.

China↗

PubMed2000

Effect of total flavonoids of hippophae rhamnoides on contractile mechanics and calcium transfer in stretched myocyte.

OBJECTIVE: To study the role of total flavonoids of hippophae rhamnoides in improving contractile [correction of contactile] function of stretched cardiac myocyte. METHOD: Flavonoids were given to stretched myocytes which were proved their contractile function decline and then myocyte contractile mechanics characteristics and calcium transfer were measured. RESULT: Flavonoids increased myocyte contractility, as indicated by myocyte shortening, velocity of shortening, peak +dL/dt and peak -dL/dt during shortening, in a concentration-dependent manner (r>0.9, P<0.001), and with no relation to the intracellular calcium transfer in the myocytes. CONCLUSION: Flavonoids of the traditional Chinese drug hippophae rhamnoides is effective in improving the contractile function of stretched cardiac myocyte in low dosage.

Animals↗

PubMed2005

[Changes in apoptosis-related genes expression profile in human breast carcinoma cell line Bcap-37 induced by flavonoids from seed residues of Hippophae Rhamnoides L].

BACKGROUND & OBJECTIVE: Hippophae rhamnoides L. possesses functions of antioxidation and radioprotection. This study was designed to investigate changes in apoptosis-related genes expression profile in human breast carcinoma cell line Bcap-37 induced by flavonoids from seed residues of Hippophae rhamnoides L. (FHR) with cDNA microarray, and to explore possible mechanism of signal transduction on apoptosis. METHODS: Total RNA was extracted from Bcap-37 cells before and after treatment of FHR. Two cDNA probes, labeled by Cy3-dUTP or Cy5-dUTP fluorescent dyes, were synthesized via reverse transcription, and hybridized with a microarray contained 13 824 human 14K cDNA. Differential gene expression profiles of FHR group and control group were analyzed by Genespring software. RESULTS: After treatment of FHR, 305 genes were up-regulated, and 361 were down-regulated; 32 apoptosis-related genes were differentially expressed, and accounted for 0.23% of the total genes in cDNA microarray. Of the 32 apoptosis-related genes, 25 were up-regulated (average Ratio: 3.071), and 7 were down-regulated (average Ratio: 0.418). Bioinformatic analyses showed that the 32 genes, including CTNNB1, TSSC3, IGFBP4, IGFBP6, GADD34, TNFRSF10B, Caspase-9, and PCNA, related with apoptosis of Bcap-37 cells when treated with FHR. CONCLUSION: Apoptosis of Bcap-37 cells induced by FHR relates with various genes through co-regulating of intracellular and extracellular signal transduction pathways.

Apoptosis↗

PubMed1997

[Determination of flavonoids in the leaves of Hippophae L. by HPLC].

A method for determination of three flavonoids in the leaves of Hippophae by high presure liquid chromatography was established. The contents of these flavonoids in the leaves of seven different species of Hippophae were determined and compared. The results provide a scientific basis for evaluating and utilizing the leaves of Hppophae.

Chromatography, High Pressure Liquid↗

PubMed2006

Protection from radiation-induced mitochondrial and genomic DNA damage by an extract of Hippophae rhamnoides.

Hippophae rhamnoides or seabuckthorn is used extensively in Indian and Tibetan traditional medicine for the treatment of circulatory disorders, ischemic heart disease, hepatic injury, and neoplasia. In the present study, we have evaluated the radioprotective potential of REC-1001, a fraction isolated from the berries of H. rhamnoides. Chemical analysis of the extract indicated that REC-1001 was approximately 68% by weight polyphenols, and contained kaempferol, isorhamnetin, and quercetin. The effect of REC-1001 on modulating radiation-induced DNA damage was determined in murine thymocytes by measuring nonspecific nuclear DNA damage at the whole genome level using the alkaline halo assay and by measuring sequence/gene-specific DNA damage both in nuclear DNA (beta-globin gene) and in mitochondrial DNA using a quantitative polymerase chain reaction. Treatment with 10 Gy resulted in a significant amount of DNA damage in the halo assay and reductions in the amplification of both the beta-globin gene and mitochondrial DNA. REC-1001 dose-dependently reduced the amount of damage detected in each assay, with the maximum protective effects observed at the highest REC-1001 dose evaluated (250 micro g/ml). Studies measuring the nicking of naked plasmid DNA further established the radioprotective effect of REC-1001. To elucidate possible mechanisms of action, the antioxidant properties and the free-radical scavenging activities of REC-1001 were evaluated. REC-1001 dose-dependently scavenged radiation-induced hydroxyl radicals, chemically-generated superoxide anions, stabilized DPPH radicals, and reduced Fe(3+) to Fe(2+). The results of the study indicate that the REC-1001 extract of H. rhamnoides protects mitochondrial and genomic DNA from radiation-induced damage. The polyphenols/flavonoids present in the extract might be responsible for the free radical scavenging and DNA protection afforded by REC-1001.

Animals↗

PubMed2005

Simultaneous determination of quercetin, kaempferol, and isorhamnetin in phytopharmaceuticals of Hippophae rhamnoides L. by high-performance liquid chromatography with chemiluminescence detection.

A novel method based on reversed-phase high-performance liquid chromatography with chemiluminescence detection has been developed for the simultaneous determination of three flavonols including quercetin, kaempferol, and isorhamnetin. The procedure was based on the chemiluminescent enhancement by flavonols of the cerium(IV)-rhodamine 6G system in sulfuric acid medium. The effects of several parameters on the HPLC resolution and CL emission were studied systematically. Good separation was achieved with isocratic elution using a mixture of methanol and aqueous 1.0% acetic acid (37:63, v/v) within 25 min. Under optimized conditions, the linear working range covers 3 orders of magnitude with relative standard deviations below 4.5% for 11 replicate injected flavonol samples, and detection limits (S/N= 3) were 1.6 x 10(-8), 3.5 x 10(-9), and 6.5 x 10(-9) g mL(-1) for quercetin, kaempferol, and isorhamnetin, respectively. The chemiluminescence reaction was compatible with the mobile phase of high-performance liquid chromatography. The proposed method has been successfully applied to the determination of three active flavonols in phytopharmaceuticals of Hippophae rhamnoides L. After a simple extraction procedure, the repeatability and recovery were satisfactory.

Cerium↗

PubMedDate not supplied

Chromatographic analysis of carotenol fatty acid esters in Physalis alkekengi and Hippophae rhamnoides.

The carotenol fatty acid esters of two potentially valuable sources of plant carotenoids, sepals of Physalis alkekengi (Chinese lantern) and fruits of Hippophae rhamnoides (sea buckthorn), were separated by column chromatography and identified by HPLC-DAD and HPLC-MS. A chemical and an enzymatic hydrolysis were employed to identify the parent carotenoids and to remove the lipid components. Zeaxanthin and beta-cryptoxanthin esters represented the main fraction in P. alkekengi sepals and an important one in H. rhamnoides fruits. Beta-Cryptoxanthin palmitate and zeaxanthin dipalmitate were identified as major compounds in both plants. In P. alkekengi, the carotenoids were mainly (> 90%) esterified with palmitic acid, and a high proportion (> 80%) of saturated medium chain fatty acids was found (by GC-MS) in the total lipid extract. Although the total lipid extract of H. rhamnoides contained significant amounts of unsaturated fatty acids, especially oleic and palmitoleic acids, the xanthophylls were mainly esterified with saturated fatty acids. The oleoresins of both species represent potential sources of carotenoid esters and can be used as food additives, cosmetic ingredients or nutraceuticals.

Chromatography, High Pressure Liquid↗

PubMed2005

Effects of total flavonoids of Hippophae rhamnoides L. on intracellular free calcium in cultured vascular smooth muscle cells of spontaneously hypertensive rats and Wistar-Kyoto rats.

OBJECTIVE: To explore the effects of total flavonoids of Hippophae rhamnoides L. (TFH), quercetin (Que) and isorhamnetin (Isor) on the intracellular free calcium ([Ca(2+)](i)) in vascular smooth muscle cells (VSMC) of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats (WKY). METHODS: Fluo 3-acetoxymethylester (Fluo-3/AM) was used to observe the effects of TFH (100 mg/L) and its essential monomers, namely Que (10(-4) mol/L) and Isor (10(-4) mol/L) on changes of [Ca(2+)](i) in cultured SHR and WKY VSMC (abbr. to Ca-SHR & Ca-WKY) following exposure to high K(+), norepinephrine (NE) and angiotensin II (Ang II), and to compare with the effects of verapamil (Ver). RESULTS: (1) TFH, Que and Isor had inhibitory effects on resting Ca-SHR (P < 0.05), but had no significant effects on Ca-WKY (P > 0.05). (2) High K(+) could increase Ca-SHR more significantly than Ca-WKY (P < 0.05); TFH, Que and Isor could inhibit the elevation of [Ca(2+)](i) induced by high K(+)-depolarization, with the effects similar to that of Ver, and the effect on Ca-SHR was more significant than that on Ca-WKY (P < 0.05). (3) NE and Ang II could increase Ca-SHR more significantly than Ca-WKY (P < 0.05), TFH, Que and Isor had remarkably inhibitory effect on the elevation of Ca-SHR and Ca-WKY induced by NE or Ang II. (4) In the absence of extracellular Ca(2+), TFH, Que and Isor also had certain inhibitory effect on Ca-SHR and Ca-WKY induced by NE, and the effect on the former was more significant than that on the latter (P < 0.05). CONCLUSION: TFH, Que and Isor might decrease the levels of [Ca(2+)](i) in VSMCs by blocking both voltage-dependent calcium channels (VDC) and receptor-operated calcium channels (ROC) in physiological or pathological state, which may be one of the important mechanisms of their hypotensive and protective effects on target organs in patients with hypertension.

Angiotensin II↗

PubMed2006

Genetic variation in Hippophae rhamnoides ssp. sinensis (Elaeagnaceae) revealed by RAPD markers.

Hippophae rhamnoides ssp. sinensis is endemic to China, and it is a dioecious, outcrossing plant. Although many studies have been undertaken mainly on its agricultural, nutritional, medical, and ornamental value, little is known about its population genetics. This study uses random amplified polymorphic DNA to investigate the genetic diversity and population genetic structure of 13 natural populations of the subspecies sinensis. Fifteen primers amplified 107 reproducible bands, with 95 (88.79%) being polymorphic. The gene diversity within population was 0.168, considerably lower than that of tree species and most perennial, outcrossing species, but higher than that of annual or short-lived, selfing species. The Gst value showed that 18.3% of the total genetic variation resided among populations, a little lower than that of outcrossing species. The present results are quite similar to those previously reported in another subspecies, H ssp. . rhamnoides rhamnoides. The low genetic differentiation among populations in ssp. sinensis may be attributed to the long-distance dispersal of seeds facilitated by birds, in addition to its characteristics of outcrossing, wind pollination, and widespread distribution. No association between genetic distance and geographical distribution was found. The population relationships revealed by the UPGMA dendrogram parallel this result, in that genetic distance did not increase with geographic separation. This pattern of population differentiation may imply the adaptation of ssp. s populations to the local environment, given that its habitats vary greatly across its distribution.

China↗

PubMed2005

Immunomodulatory effects of seabuckthorn (Hippophae rhamnoides L.) against chromium (VI) induced immunosuppression.

The present study reports the immunomodulatory effects of seabuckthorn (Hippophae rhamnoides L.) leaf extract on cellular and humoral immune response by studying delayed-type hypersensitivity response, IL-2, IL-4 and gamma-IFN levels and antibody titres in chromium-induced immunosuppressed animals. Oral feeding of chromium (30 mg/kg bw) significantly inhibited antibody production and S-RBC induced delayed-type hypersensitivity response. Administration of leaf extract (100 mg/kg bw) along with chromium significantly inhibited chromium-induced immunosuppression. To understand the immunomodulatory mechanism of leaf extract, in vitro studies were carried out using rat lymphocytes. Addition of chromium resulted in a significant decrease in lymphocyte size and increased ROS generation. The leaf extract of seabuckthorn significantly inhibited chromium-induced reactive oxygen species (ROS) generation and maintained the cell size identical to that of control cells. Chromium treatment markedly inhibited the mitochondrial transmembrane potential by larger lymphocytes in particular, while the leaf extract restored the same significantly. Chromium also inhibited significantly concanavalin A (ConA) induced IL-2, IL-4 and gamma-IFN production in rat lymphocytes. The leaf extract (100 microg/ml) alone stimulated IL-2 and gamma-IFN production even in the absence of ConA and also inhibited chromium-induced decline in IL-2 and gamma-IFN production but it did not change IL-4 production. These observations suggest that the leaf extract of seabuckthorn has significant immunomodulatory activity and specifically activates the cell-mediated immune response.

Animals↗