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Sarma Pranamee

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23.06.2018

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  • Sarma Pranamee
  • Pranamee Sarma
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    Sarma Pranamee

    Mice were evenly distributed between vehicle and Otreated groups before the initiation of treatment. One mouse, where the tumour was regressing in the lung, was removed from the study to confirm the imaging results by visualizing the lung using an India ink stain and a dissecting microscope. The data presented correspond to the number of metastatic foci in the lungs harvested from vehicle- and CBD-treated mice, where immunohistochemical detection of Id1 was either negative, weakly positive or strongly positive.

    Experiments were carried out as previously described Felder et al. Data represent the mean with corresponding confidence limits CL for three independent determinations. Our goal was to discover a compound that could efficiently target both cannabinoid anti-tumour pathways. Changes in protein levels were evaluated using Western analysis. CBD reduced breast cancer metastasis in advanced stages of the disease as the direct result of down-regulating the transcriptional regulator Id1.

    However, this was associated with moderate increases in survival. We therefore screened for analogues that could co-target cannabinoid anti-tumour pathways CBD- and THC-associated and discovered the compound O This analogue inhibited Id1, produced a marked stimulation of ROS, up-regulated autophagy and induced apoptosis.

    Of all the compounds tested, it was the most potent at inhibiting breast cancer cell proliferation and invasion in culture and metastasis in vivo. O prolonged survival in advanced stages of breast cancer metastasis. Developing compounds that can simultaneously target multiple cannabinoid anti-tumour pathways efficiently may provide a novel approach for the treatment of patients with metastatic breast cancer.

    This Table lists key protein targets and ligands in this document, which are hyperlinked to corresponding entries in http: The processes leading to metastatic progression are still not well understood Kraljevic Pavelic et al. Therefore, there is an urgent need to develop non-toxic therapeutic interventions that specifically target metastatic progression. A recent, exciting area of study for the therapeutic applications of THC and CBD has been their anti-tumour activity against a variety of aggressive cancers Velasco et al.

    Each compound, however, has its own unique mechanism of action. In culture and in vivo , the primary mechanisms leading to the inhibition of tumour progression by THC include de novo synthesis of ceramide, leading to endoplasmic reticulum stress and autophagy-mediated cell death Carracedo et al. As opposed to THC, the pathways responsible for anti-tumour activity of CBD have not been well defined, particularly in vivo. In culture, the most unifying theme is the production of reactive oxygen species ROS Ligresti et al.

    It has been proposed by our group and others that targeting both cannabinoid anti-tumour pathways simultaneously may provide enhanced anti-tumour activity Marcu et al.

    However, it has been shown that similar anti-tumour activity of mixed CB receptor agonists those targeting CB 1 and CB 2 could be reproduced using non-psychoactive CB 2 selective agonists Blazquez et al.

    We have previously reported that CBD inhibits Id1 gene expression and corresponding breast cancer aggressiveness in culture McAllister et al. Id1 is a transcriptional regulator that has been shown to play a critical role in mediating breast cancer tumourigenicity and metastasis to the lung Fong et al.

    Based on our discovery that CBD targets Id1 and our past experience with structure-activity relationship of cannabinoids McAllister et al. Since THC and CBD individually have also been shown to have therapeutic efficacy against other disease states, there is also a potential broad-based use for this approach. While some potential targets, such as Id1, explaining the anti-metastatic activity of CBD have been identified in culture, limited investigations have determined whether these targets are modulated in secondary tumours derived from disseminated cancer cells.

    The lack of a viable biomarker predicting successful targeting of metastasis by CBD limits the development of future clinical trials and the potential synthesis of more potent and efficacious analogues. Additionally, the pharmacological assessment of cannabinoids, particularly CBD, has been limited, with most studies incorporating the use of only a single dose and no cannabinoid has been previously shown to extend survival in a model of metastasis. In this investigation, we determined that the anti-metastatic activity of CBD was directly related to the down-regulation of Id1 in vivo and, in addition, discovered that CBD was also effective at inhibiting advanced stages of metastasis.

    Based on these results, we then screened compounds and discovered a cannabinoid analogue that was more active than CBD at down-regulating Id1 and was also a CB 2 selective agonist that could target CB 2 receptor anti-tumour pathways. We present mechanistic data unique to this analogue that demonstrates inhibition of advanced stages of metastasis in preclinical models leading to prolonged survival. All cell lines were cultured as we previously described McAllister et al.

    For the in vivo studies, 6—8 week old female mice were used. Ten mice per group were used for the orthotopic studies and 6—8 mice per group were used for the i. Mice were cared for as we previously described McAllister et al. Animals in all the different groups control and treated were removed from the study when they demonstrated any single sign indicative of significant tumour burden development in the lung including labored breathing, hunched back, closed eyes or decreased general activity.

    These signs generally preceded any significant decrease in weight. All studies involving animals are reported in accordance with the ARRIVE guidelines for reporting experiments involving animals Kilkenny et al. CBD treatment was initiated upon first detection of the primary tumours 1 week until the completion of the study approximately 1 month. Treatment and analysis were performed as previously described McAllister et al.

    The mouse 4T1 i. One or 7 days after the injection, the tumour-bearing mice were i. Two or 18 days after the injection, the tumour-bearing mice were i. Fifteen minutes before imaging, mice were i. Western blotting was performed as previously described McAllister et al.

    The blots were probed with anti-Id1 or anti-Id2 McAllister et al. The relative amounts of protein were quantified using densitometry and the software programme ImageJ NIH.

    All values in separate experiments were normalized to the corresponding vehicle control values. Cells were grown in 6-well culture dishes and treated with the appropriate compounds every 24 h for 2 days. Labelled cells were analysed by cell flow cytometry using the Muse cell analyzer.

    Survival between groups was compared using a log-rank Mantel—Cox test. Additional methods are described in the Supporting Information. While CBD has been shown to inhibit breast cancer metastasis in vivo , a detailed pharmacological analysis to determine potency and efficacy has not been performed. Utilizing the 4T1 i. The potency of CBD at targeting metastasis in the i. CBD was also effective at reducing metastatic progression in an orthotopic model utilizing 4T1 cells Supporting Information Fig.

    S2A—C even when the drug was administered three times a week as opposed to daily, but the cannabinoid did not inhibit primary tumour growth. In both the i. Since orthotopic models suffer from significant variability and CBD did not inhibit primary tumour growth, we continued our investigations into the anti-metastatic activity of CBD using the i.

    In the culture, the ability of CBD to inhibit breast cancer aggressiveness is the direct result of down-regulation of Id1 expression McAllister et al. To determine whether the anti-metastatic activity of CBD was directly related to the down-regulation of Id1 in vivo , we first determined whether CBD down-regulated Id1 gene expression in the tumour tissue. We have previously shown that CBD does not inhibit Id1 expression and invasion in these cells in the culture McAllister et al.

    Inhibition of Id1 expression in vivo is necessary for the anti-metastatic activity of CBD. A Immunohistochemical detection of Id1 and Ki67 was performed in lung tissues of vehicle left and CBD right treated 4T1-derived tumours. Nuclei are visible in blue haematoxylin staining. B The intensity of Id1 expression is shown. C The percentage of Ki67 positive cells per lung metastatic foci was evaluated.

    Two days after the injection, the tumour bearing mice were injected i. We found that CBD dose-dependently reduced the growth of established lung metastatic foci, reduced the formation of new metastatic foci and increased survival Figure 2B—D.

    Based upon these findings, we expected that synthesis of more active analogues based upon CBD would result in the development of a compound that could produce more robust inhibition of advanced stages of metastasis. CBD reduces the formation of metastatic foci and increases survival in advanced stages of metastatic progression. A The pictures are representative of tumour formation observed at days 5, 7 and 9.

    B Seven days after the injection of tumour cells, mice were injected i. Our past studies McAllister et al. S4A and B suggested the unique activity inhibition of Id1 gene expression of CBD was related to the opened pyran ring, the possession of an extended alkyl side chain and was not due to interactions with the abnormal CBD receptor. While selective activation of CB 2 receptors leads to anti-tumour activity Blazquez et al. We reasoned however that a CB 2 selective cannabinoid agonist, having limited activity at CB 1 receptors psychoactivity , could be developed to target Id1, resulting in a single compound that could efficiently target multiple pathways associated with cannabinoid activity leading to enhanced anti-tumour activity.

    Experiments were carried out as previously described McAllister et al. Data represent the mean with corresponding confidence limits for three to six independent determinations. O was previously synthesized in a series of bicyclic resorcinol derivatives that resembled CBD Supporting Information Fig.

    S4A Wiley et al. It has been previously shown to have lower affinity for CB 1 receptors compared with THC and produces little activity in the tetrad assay measure of psychoactivity in vivo Wiley et al. In all studies, the drugs were co-administered. The antago nist alone had no significant effects on cell viability Supporting Information Fig. The ability of the cells to migrate and invade in modified Boyden chambers was then determined.

    Id2 expression was also determined in 4T1 cells treated with vehicle control , 1. While no reversal of CBD activity was observed using the CB 2 receptor antagonist SR, it was able to partially reverse the inhibitory effects of O Id2 is a marker of good prognosis in breast cancer patients and is specifically up-regulated following inhibition of Id1 expression Itahana et al. S5C is a primary mechanism that leads to the inhibition of Id1 expression, cell growth, invasion and survival across multiple cancers Ligresti et al.

    D A representative example of the Western blot analysis for LC3 is shown. E The number of cells positive for annexin staining after 2 days treatment with 1. A primary mechanism for the anti-tumour activity of the mixed CB 1 and CB 2 receptor agonist THC and CB 2 selective agonists is the up-regulation of the autophagy pathway Velasco et al. We found that O was 2. Moreover, no overt toxicity was noted with O in the mouse models of metastasis as assessed by weight, appearance and general activity data not shown.

    O is more potent than CBD at inhibiting breast cancer metastasis. One day after the injection, the tumour-bearing mice were i. In agreement with our findings in the culture, the anti-metastatic activity of CBD was not affected by co-administration with SR SR2 , whereas the anti-metastatic activity of O was partially reversed by the antagonist.

    Seven days after i. O produces a significant inhibition of advanced stage breast metastasis. A, B One week after the injection of 4T1 cells, the tumour-bearing mice were injected i.

    Indicates where one animal responding well to treatment with O based on BLI was removed in order to stain and visualize lung metastatic foci. We next utilized MDA-MBluc-D3H2LN cells in order to determine whether O would produce robust anti-metastatic activity against a human breast cancer cell line in advanced stages of disease progression.

    This variant is significantly more aggressive than the parental line with a rapid disease progression with a time course more closely resembling the 4T1 model. Additionally, the expression of luciferase allowed us to assess the activity of the drug treatments longitudinally in real time using BLI and to demonstrate that metastases were present in the lung when the treatment was initiated.

    This cell line was therefore significantly less sensitive to the effects of CBD but not O While regression did occur beyond the initial size of the tumour in some mice, the tumour did adapt over time and began to progress again.

    One mouse, where the tumour was regressing in the lung, was removed from the study to confirm the imaging results by visualizing the lung using an India ink stain and a dissecting microscope Supporting Information Fig.

    We therefore initiated treatment with CBD 2 days after mice were i. While CBD inhibited disease progression in a subset of the mice, overall survival was not significantly improved Supporting Information Fig. CBD has been reported to have a wide variety of therapeutic indications and has been shown to be non-toxic, safe and well-tolerated in clinical trials Zuardi, Our goal was to discover a compound that could efficiently target both cannabinoid anti-tumour pathways.

    Changes in protein levels were evaluated using Western analysis. CBD reduced breast cancer metastasis in advanced stages of the disease as the direct result of down-regulating the transcriptional regulator Id1.

    However, this was associated with moderate increases in survival. We therefore screened for analogues that could co-target cannabinoid anti-tumour pathways CBD- and THC-associated and discovered the compound O This analogue inhibited Id1, produced a marked stimulation of ROS, up-regulated autophagy and induced apoptosis.

    Of all the compounds tested, it was the most potent at inhibiting breast cancer cell proliferation and invasion in culture and metastasis in vivo. O prolonged survival in advanced stages of breast cancer metastasis. Developing compounds that can simultaneously target multiple cannabinoid anti-tumour pathways efficiently may provide a novel approach for the treatment of patients with metastatic breast cancer.

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    Pranamee Sarma

    Ryuichi Murase,1 Rumi Kawamura,1 Eric Singer,1 Arash Pakdel,1 Pranamee Sarma,1 Jonathon Judkins,1 Eiman Elwakeel,1 Sonali Dayal,1 Esther. View the profiles of people named Pranami Sarma. Join Facebook to connect with Pranami Sarma and others you may know. Facebook gives people the power. See what Pranamee Sarma (sarmapranamee) has discovered on Pinterest, the world's biggest collection of ideas.

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    nekro1313

    Ryuichi Murase,1 Rumi Kawamura,1 Eric Singer,1 Arash Pakdel,1 Pranamee Sarma,1 Jonathon Judkins,1 Eiman Elwakeel,1 Sonali Dayal,1 Esther.

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