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on Cannabinoid cytokines action



  • on Cannabinoid cytokines action
  • Cannabinoid influence on cytokine profile in multiple sclerosis
  • Introduction
  • How cannabinoids influence immune function has been examined extensively in the last 30 years. Studies on drug-abusing humans and animals, as well as in. The cannabinoid system and cytokine network. effects possibly through inhibiting the production and action of TNF-alpha and other acute phase cytokines. Cytokines are the signaling proteins synthesized and anti-inflammatory effects of THC were demonstrated in.

    on Cannabinoid cytokines action

    The increase in ceramide level can be dependent on the de novo synthesis or the release from membrane sphyngolipids induced by the activation of sphyngomyelinase. The different origins of ceramide can be disclosed by the employment of specific inhibitors of the two enzymes, fumonisin B1, the inhibitor of ceramide synthase, or desipramine, an inhibitor of sphyngomyelinase 41 , In many cannabinoid signalling pathways, ROS can exert a crucial role in activating both initiator and executioner caspase activities suggesting that continuous oxidative stress can occur following cannabinoid exposure.

    The involvement of ROS in cannabinoid-induced apoptosis has been widely evidenced in glioma and leukemia cells 43 , Moreover, the demonstration of ROS involvement in cannabinoid-induced apoptosis is also confirmed by the employement of N-acetyl-cysteine, a thiol antioxidant that scavenges ROS, or the NAD P H oxidase inhibitors, which are able to attenuate cannabinoid effects.

    A strong interplay between ceramide and generation of oxidative stress has been demonstrated. Ceramide stimulates the formation of ROS and apoptotic mechanisms, establishing a link between sphingolipid metabolism and oxidative stress. Moreover, inhibition of ROS generating enzymes or treatment with antioxidants impairs sphingomyelinase activation and ceramide production.

    Therefore, it is plausible to hypothesize that the contemporaneous activation of CB and TRP vanilloid receptors, responsible for the triggering of the two intracellular mediators ceramide and ROS , can augment the effects induced by cannabinoids carrying out an amplification of caspase cascades. The study on downstream events following ROS generation or ceramide induction has evidenced the involvement of ER-stress. On the other hand, a relationship between the increase in ceramide level and ER-stress is also well documented in cannabinoid-induced apoptosis in tumor cells A plethora of data reports the activation of stress-activated protein kinases or extracellular-related signal kinases in cannabinoid-dependent control of cancer cell growth and survival 43 , Interestingly, it has been demonstrated that the duration of the stimulus can be fundamental for the type of cellular response.

    A transient activation of ERK cascade leads to cell survival and proliferation, while long-term ERK activation results to apoptotic response as proposed by Galve-Roperh et al 48 in malignant glioma and confirmed in Kaposi sarcoma cells Differently, studies on several prostate and ovarian cancer cell lines evidenced that the activation of ERK signalling by the putative cannabinoid receptor GPR55 activates an autocrine loop that sustains cell proliferation It is well known that the activation of death pathways needs to be accompanied by downregulation of survival factors.

    On the contrary, inhibition of pAKT leads to cell cycle arrest which precedes apoptotic response very often mediated by the involvement of intrinsic mitochondria-dependent pathway.

    Downregulation of AKT is involved in cannabinoid antitumoral action. In human gastric cancer cells, it has been reported that cannabinoid receptor agonists induce cell cycle arrest which is a consequence of AKT inhibition related to the activation of MAPK pathway Interesting results were also obtained in astrocytoma In this model, cannabinoids induce apoptosis only in cells expressing low levels of CB receptors, while in cells with high CB receptor levels, cannabinoids are ineffective because of the contemporaneous high amount of the phosphorylated pro-survival AKT.

    These results suggest that the coupling of CB receptors to AKT pathway when these receptors are expressed at mid and high levels eliminates the ability of cannabinoids to induce apoptosis in astrocytoma cells. As previously indicated, autophagy can assume different and opposite roles in cell fate. In fact, this process may trigger survival pathways, collaborate with apoptosis to induce cell death or substitute itself to apoptosis to start an autonomous death pathway.

    Numerous recent studies have indicated the cannabinoid-mediated induction of autophagy in different experimental cancer models. Noteworthy is the observation that the activation of autophagic pathway is often mediated by the same molecules that are involved in apoptosis. In these cells autophagy seems to be upstream of apoptosis in cannabinoid-induced cancer cell death.

    The stimulation of autophagy-mediated apoptosis induced by cannabinoids has also been demonstrated in animal models of cancer, including glioma 54 , Similar studies performed to investigate the effects of cannabinoids on the growth of hepatocellular carcinoma cells have demonstrated that THC markedly reduces the viability of the human hepatocellular carcinoma cell lines through induction of autophagy mediated, also in this case, by upregulation of TRB3 and subsequent inhibition of the serine-threonine kinase AKT and AMPK stimulation.

    As in glioma animal model, in vivo studies on hepatocellular carcinoma subcutaneous xenografts have revealed that THC-dependent growth inhibition is reduced when autophagy is genetically or pharmacologically blocked, thus confirming that the induction of autophagy can be a key step in cannabinoid-induced cell death Further biochemical pathways have been suggested in the attempt to clarify the molecular mechanisms of cell death induced by cannabinoids. In addition, data have also shown the activation of intrinsic apoptotic pathway.

    The coexistence of autophagy and apoptosis has been confirmed by different observations: A new recent study on the interplay between autophagy and apoptosis induced by cannabinoids showed a surprise in mantle cell lymphomas Interestingly, this study shows that the response to cannabinoid treatment decreases cell viability which does not involve the caspase-3 cascade.

    Moreover, mantle cell lymphoma primary cells respond to cannabinoid treatment through the formation of cycloheximide-sensitive cytoplasmic vacuoles. However, the lack of enhanced autophagosome formation and lysosomal contribution also excludes the involvement of a canonical autophagic process. The authors hypothesize that the observed features resemble paraptosis-like cell death, a third type of programmed cell death, not previously described in response to cannabinoids.

    Activation of more types of cell death by cannabinoids widens their potential therapeutic usefulness in cells overexpressing cannabinoid receptors. Recent studies have demonstrated the ability of cannabinoids to synergize with other molecules to trigger death pathways in cancer cells. It is well known that in cancer therapy the employment of combinations of drugs rather than a single drug represents a therapeutic strategy with distinct advantages.

    On the one hand, the contemporaneous activation of different biochemical pathways can achieve synergistic effects; on the other hand, the combination can result in a reduction of the dose of each single drug thereby reducing side effects. Thus, the ability of cannabinoids in synergizing with other drugs to improve their anticancer activity has been investigated. In particular, we have recently demonstrated that the synthetic cannabinoid WIN55, sensitizes hepatocellular carcinoma cells to apoptosis, mediated by tumor necrosis-related apoptosis inducing ligand TRAIL.

    This event seems to be related to the increase in the level of p8 and CHOP, two factors implicated in ER stress response and apoptosis. Moreover, WIN55, treatment also induces a marked downregulation of some survival factors. Therefore, both the induction of DR5 and the decrease of survival factors explain synergistic effects of the drugs in hepatocellular carcinoma cells.

    Our unpublished data obtained in osteosarcoma cells seem to indicate that WIN also triggers an autophagic pathway with the increase in the level of beclin-1 and LC-3 II, but this pathway is not carried out because of the lysosomal membrane permeabilization.

    Also, in pancreatic cancer cells the combination of cannabinoids with gemcitabine, a pyrimidine analog largely employed in anticancer therapy, induces synergistic effects via activation of autophagy In this case, gemcitabine induces upregulation of both CB receptors thus sensitizing cells to cannabinoid effects. A central role in this pathway seems to be related to the increase in ROS production, induction of ER-stress which carried out to specific cell death pathway of type II autophagy.

    A curious observation about the therapeutic potential of cannabinoids is that in the first example cannabinoids sensitize the cells to TRAIL-induced cell death while in the latter the cannabinoid death action is potentiated by gemcitabine addition in pancreatic cancer cells.

    Another example of synergistic effects of cannabinoids with other drugs has also been reported by Gustafsson et al 60 who demonstrated that the synthetic cannabinoid HU, anandamide and its other derivatives induce synergistic and cytotoxic, rather than antiproliferative, effects when employed in combination with the classic pyrimidine antagonist 5-fluorouracil 5-FU in the colorectal carcinoma cells.

    The authors report that the effect does not seem to involve cannabinoid receptors and suggest the involvement of ER-stress because the employment of common antioxidants attenuates cannabinoid cytotoxicity. Autophagy is also involved in the strong antitumoral effects induced in glioma xenografts by combined administration of THC and temozolomide, the benchmark agent for the management of glioblastoma multiforme, an effect that is also observed in tumors which are resistant to temozolomide treatment.

    Data reported in this review seem to confirm the ability of cannabinoids to induce cell death in different tumor models. Moreover, it can be seen from the brief literature overview presented here that these compounds are effective in inducing the main cell death modes, i.

    Unfortunately, to simplify the mechanisms induced by cannabinoids to carry out cells to death and discriminate the role played by each intracellular mediator appears to be very difficult for different reasons: Furthermore, the observation that cannabinoids can synergize with other molecules thus accelerating death pathway, make these compounds, employed alone or in combination, promising for clinical outcome.

    The molecular basis of oncogenes and tumor suppressor genes. Ann NY Acad Sci. Role of oncogenes and tumor suppressor genes in multistage carcinogenesis. The role of apoptosis in cancer development and treatment response. Brown JM and Wilson G: Apoptosis genes and resistance to cancer therapy: Tsatsanis C and Spandidos DA: Oncogenic kinases signaling in human neoplasms. A decade of caspases. Green DR and Kroemer G: The pathophysiology of mitochondrial cell death. Hepatocyte growth factor installs a survival platform for colorectal cancer cell invasive growth and overcomes p38 MAPK-mediated apoptosis.

    Survivin and IAP proteins in cell-death mechanisms. Deregulation of the AKT pathway in human cancer. Curr Cancer Drug Targets. Role of autophagy in cancer. The dynamic nature of autophagy in cancer. Microautophagy of the nucleus requires the core macroautophagy genes. Peroxisome turnover by micropexophagy: Am J Physiol Renal Physiol. Curr Op Cell Biol. Nat Rev Mol Cell Biol. Eisenberg-Lerner A and Kimchi A: The paradox of autophagy and its implication in cancer etiology and therapy.

    Cross talk between apoptosis and autophagy by caspase-mediated cleavage of Beclin 1. Expt Op Invest Drugs. Antitumorigenic effects of cannabinoids beyond apoptosis.

    J Pharmacol Exp Therapeutics. Antineoplastic activity of cannabinoids. J Natl Cancer Inst. Demuth DG and Molleman A: The CB2 cannabinoid receptor signals apoptosis via ceramide-dependent activation of the mitochondrial intrinsic pathway.

    Endocannabinoids in endocrine and related tumours. Anandamide induces apoptosis in human cells via vanilloid receptors. Evidence for a protective role of cannabinoid receptors.

    Anandamide induces cell death through lipid rafts in hepatic stellate cells. The antimitogenic effect of the cannabinoid receptor agonist WIN on human melanoma cells is mediated by the membrane lipid raft.

    Palmitoylation of cysteine of helix 8: The putative cannabinoid receptor GPR55 promotes cancer cell proliferation. Down-regulation of tissue inhibitor of metalloproteinases-1 in gliomas: Cannabinoid receptor activation induces apoptosis through tumor necrosis factor alpha-mediated ceramide de novo synthesis in colon cancer cells. Controls were obtained from random anonymized patient samples sent to the immunology laboratory for routine immunological analyses.

    Peripheral blood mononuclear cells PBMC were isolated within 12 h of blood sampling see below. CRP levels were measured as a marker of concurrent infection and a surrogate marker of IL Control wells contained monensin only. The cells were subsequently harvested, washed, fixed and permeabilized using a commercial kit Dako Intrastain; Becton-Dickinson, Oxford, UK.

    Measurements were taken in duplicate using samples from each of the cell culture wells. All experiments and data collection were completed prior to unblinding.

    The study was approved by the South-West multi-centre research ethics committee and was undertaken under licence from the UK Home Office. All participants provided written informed consent.

    A total of patients were recruited to the main CAMS study from the two centres Plymouth, 79; Queen Square, 51 after the initial pilot phase of 20 patients had been recruited in Plymouth. Samples were available from patients, two of whom did not commence medication.

    The disposition of patients according to treatment group and disease type is shown in Table 1. Only two patients in this cohort had a relapse treated with 1 g methylprednisolone for 3 days during the study period, one in each of the cannabis extract and placebo groups. Grouping the two active treatment groups together gave similar results and there were no significant treatment effects on measured cytokines when the cohort was analysed according to disease type PPMS or SPMS. The asterisk represents an extreme value more than three interquartial ranges from the box hinges.

    Asterisks represent extreme values more than three interquartial ranges from the box hinges; open circles represent outliers more than 15 interquartial ranges from the box hinges. Using the Mann—Whitney U -test and Wilcoxon matched pairs, there was no evidence of a significant difference in serum cytokine levels between controls and MS patients Table 3.

    Mann—Whitney U -test comparing serum cytokine results in vivo between MS patients and controls. Peripheral blood mononuclear cells PBMC were cultured with progressive multiple sclerosis PMS , ionomycin and monensin for 7 h, fixed and permeabilized. Results from the present experiments do not demonstrate any significant effects of cannabinoids on the cytokine profiles examined. However, numbers are small and standard deviations large, so that relatively small but possibly clinically useful effects cannot be excluded from these results.

    The small numbers also make it very difficult to distinguish any differences between cytokine profiles in primary and secondary progressive disease patterns. The majority of cannabinoid actions are thought to be mediated via cannabinoid receptors, two types of which have been identified and cloned. CB 1 receptors [ 11 ] are found predominantly in the central nervous system whereas CB 2 receptors [ 12 ] are principally located peripherally, especially on leucocytes.

    The majority of experimental evidence suggests that cannabinoids are anti-inflammatory and may be associated with a Th1 to Th2 shift. This may be mediated via a reduction in IL [ 14 ].

    The correlation between serum level and symptomatic or immunological effect is the focus of ongoing work. The data are difficult to interpret as high lipid solubility of this group of drugs means that serum levels may not necessarily reflect therapeutic doses, due to concentration within particular compartments such as the central nervous system. These differences in doses may explain partly why the situation in humans appears to be more complicated than experimental data would suggest.

    Cannabis use has also been associated with a decrease in IL-2 levels and Th1-type cytokine profile and an increase in IL and Th2 cytokines [ 19 ]. It is difficult to assess the significance of these results, as numbers were small and no adjustments were made for multiple comparisons.

    The fact that anti-TNF therapy has been shown to worsen the course of MS [ 20 ] suggests that classical concepts of proinflammatory cytokines being detrimental to the disease course may be an over-simplification of disease pathogenesis. Overall, the bulk of evidence would suggest that cannabinoids are anti-inflammatory.

    Interestingly, there has been a recent report of a new diagnosis of MS occurring following treatment with a cannabinoid receptor-1 antagonist for obesity [ 21 ], and longer-term follow-up results from the CAMS study suggest that cannabinoids may have more than just a symptomatic role in the treatment of MS [ 22 ]. More work is now needed both to determine the functional significance of cannabinoid receptors on cells of the immune system, and to investigate whether cannabinoids have an immunomodulatory role at doses likely to be used therapeutically.

    National Center for Biotechnology Information , U. Journal List Clin Exp Immunol v. Author information Article notes Copyright and License information Disclaimer. Accepted Feb This article has been cited by other articles in PMC. Abstract Cannabinoids have been suggested as possessing immunomodulatory properties, and cannabinoid receptors are present on leucocytes.

    Introduction Multiple sclerosis MS is the most common cause of neurological disability in young adults, with a prevalence of around one in in most of the United Kingdom [ 1 ].

    Materials and methods Patients Patients with stable MS were recruited into a double-blind placebo-controlled trial looking at the effect of oral cannabinoids on spasticity, the CAMS study [ 3 ].

    Cannabinoid influence on cytokine profile in multiple sclerosis

    Request PDF on ResearchGate | Cannabinoids, Immune System and Cytokine Network | How cannabinoids influence immune function has been examined. Jul 31, Request PDF on ResearchGate | Interaction between cytokines, of the cannabinoid system is associated with therapeutic effects that may be. CANNABINOID EFFECTS ON. IMMUNE FUNCTION. The immune system is a complex network of cells, tissues and soluble mediators, including cytokines and .




    Request PDF on ResearchGate | Cannabinoids, Immune System and Cytokine Network | How cannabinoids influence immune function has been examined.


    Jul 31, Request PDF on ResearchGate | Interaction between cytokines, of the cannabinoid system is associated with therapeutic effects that may be.


    CANNABINOID EFFECTS ON. IMMUNE FUNCTION. The immune system is a complex network of cells, tissues and soluble mediators, including cytokines and .

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