“The aim of this review is to discuss cannabinoids from a preclinical and clinical oncological perspective and provide the audience with a concise, retrospective overview of the most significant findings concerning the potential use of cannabinoids in cancer treatment.
Cannabis sativa is a plant rich in more than 100 types of cannabinoids. Besides exogenous plant cannabinoids, mammalian endocannabinoids and synthetic cannabinoid analogues have been identified. Cannabinoid receptors type 1 (CB1) and type 2 (CB2) have been isolated and characterized from mammalian cells. Through cannabinoid receptor and non-receptor signaling pathways, cannabinoids show specific cytotoxicity against tumor cells, while protecting healthy tissue from apoptosis. The dual antiproliferative and proapoptotic effects of cannabinoids and associated signaling pathways have been investigated on a large panel of cancer cell lines. Cannabinoids also display potent anticancer activity against tumor xenografts, including tumors that express high resistance to standard chemotherapeutics. Few studies have investigated the possible synergistic effects of cannabinoids with standard oncology therapies, and are based on the preclinically confirmed concept of “cannabinoid sensitizers.” Also, clinical trials aimed to confirm the antineoplastic activity of cannabinoids have only been evaluated on a small number of subjects, with no consensus conclusions regarding their effectiveness.
A large number of cannabinoid compounds have been discovered, developed, and used to study the effects of cannabinoids on cancers in model systems. However, few clinical trials have been conducted on the use of cannabinoids in the treatment of cancers in humans. Further studies require extensive monitoring of the effects of cannabinoids alone or in combination with standard anticancer strategies. With such knowledge, cannabinoids could become a therapy of choice in contemporary oncology.”
“The palliative effects of cannabis sativa (marijuana), which include appetite stimulation, attenuation of nausea and emesis, and pain relief, are well known.
The active components of cannabis sativa (cannabinoids) and their derivatives have received growing interest due to their diverse pharmacological activities, such as cell growth inhibition and tumour regression.
The aim of this review is to look at the current evidence on the antiproliferative effects of cannabinoids in urological malignancies, including renal, prostate, bladder, and testicular cancers.
The search yielded a total of 93 studies from Medline and PubMed, of which 23 studies were included in the final analysis. To date, there are various in vitro studies elucidating the potential mechanism of action of cannabinoids for urological cancers, along with population-based studies specifically for testicular malignancies. To date, no clinical trials have been conducted for urological cancer patients.
These results demonstrate that the role of endocannabinoids for urological malignancies is an area of active research. Further research is required not only to evaluate the crosstalk between cancer signaling pathways and cannabinoids, but also large randomized clinical studies with urological patients need to be conducted before cannabinoids can be introduced as potential therapeutic options for urological neoplasms.”
“Colorectal cancer (CRC) is a major health problem in Western countries. The endocannabinoid 2-arachidonoyl-glycerol (2-AG) exerts antiproliferative actions in a number of tumoral cell lines, including CRC cells.
Monoacylglycerol lipase (MAGL), a serine hydrolase that inactivates 2-AG, is highly expressed in aggressive human cancer cells.
Here, we investigated the role of MAGL in experimental colon carcinogenesis.
MAGL, possibly through modulation of angiogenesis, plays a pivotal role in experimental colon carcinogenesis.
Pharmacological inhibition of MAGL could represent an innovative therapeutic approach to reduce colorectal tumor progression.”
“Cannabinoid– 2 (CB2) receptor is known for its anti-obesity effects silencing the activated immune cells that are key drivers of metabolic syndrome and inflammation.
Nutritional interventions in experimental models of carcinogenesis have been demonstrated to modulate tissue inflammation state and proliferation.
OBJECTIVE: Aim of this study was to test, in ApcMin/+ mice, whether a diet enriched with olive oil, omega- 3 and omega-6- PUFAs affects the adipose tissue inflammation status.
RESULTS: The diet enriched with olive oil significantly induced CB2 receptor expression and it was able to control inflammatory and proliferative activity of mice adipose tissue.
CONCLUSIONS: The present findings open opportunities for developing novel nutritional strategies considering olive oil a key ingredient of a healthy dietary pattern.”
“Seventy phytocannabinoids are now known to be synthesized by Cannabis sativa (marijuana)]. The major non-psychoactive cannabinoid cannabidiol (CBD) exhibits antiproliferative effects against breast, cervix, colon, glioma, leukemia, ovary, prostate, and thyroid cancer cells. In this study, we investigated the antiproliferative effect of CBD on the ME-180 cervical cancer cell line. The results of our study suggest that CBD exerts its antiproliferative effect via multiple mechanisms, and it could be a potential treatment for cervical cancer.”
“Terpinolene (TPO) is a natural monoterpene present in essential oils of many aromatic plant species.
Our findings clearly demonstrate that TPO is a potent antiproliferative agent for brain tumour cells and may have potential as an anticancer agent, which needs to be further studied.” http://www.ncbi.nlm.nih.gov/pubmed/24084350
“Three different medicinal cannabis varieties were investigated Bedrocan, Bedrobinol and Bediol. The major components in Bedrocan smoke were Delta(9)-THC, cannabinol (CBN), terpinolene, CBG, myrcene and cis-ocimene in Bedrobinol Delta(9)-THC, CBN and myrcene in Bediol CBD, Delta(9)-THC, CBN, myrcene, CBC and terpinolene.” http://www.ncbi.nlm.nih.gov/pubmed/20118579
“The sedative effect of inhaled terpinolene in mice and its structure-activity relationships.” http://www.ncbi.nlm.nih.gov/pubmed/23339024
“Breast cancer is the leading cause of cancer-related deaths among women aged 34–50 worldwide, and is the most commonly diagnosed metastasizing tumor in women of all ages. Despite advances in understanding breast cancer as a disease, there remains a critical need for novel disease-modifying therapeutics.
Nonspecific cannabinoids, cannabinoid receptor 2 (CB2)-selective, as well as cannabinoid receptor 1 (CB1)-selective compounds have yielded similar antitumor results in several tumor models. The lack of neuronal expression of CB2 receptors precludes CB2 selective compounds from inducing the psychotropic effects that typically accompany CB1 activation.
Our group and others have shown that CB2 agonists displaying selectivity for the CB2 receptor can decrease tumor cell viability and significantly attenuate cancer-induced bone pain without displaying psychoactive or addictive properties.
…antitumor effects of cannabinoids have been demonstrated in a variety of tumor models…
The antiproliferative effects of a CB2 agonist along with our previous work demonstrating significant efficacy in inhibiting bone cancer pain and slowing bone loss in a murine model of advanced breast cancer strongly suggest that CB2 agonists should be investigated in humans as adjunct therapy for advanced stages of breast cancer.
“Endogenous and synthetic cannabinoids exert antiproliferative and proapoptotic effects in various types of cancer and in mantle cell lymphoma (MCL).
In this study, we evaluated the expression of cannabinoid receptors type 1 and type 2 (CB1 and CB2) in non-Hodgkin lymphomas of B cell type.
Together, our results suggest that therapies using cannabinoid receptor ligands will have efficiency in reducing tumor burden in malignant lymphoma overexpressing CB1 and CB2.”
“Objective To investigate the effects of WIN55, 212-2 (WIN) on the proliferation, invasion and migration of SMMC-7721 hepatocellular carcinoma cells and its underlying mechanisms. Methods SMMC-7721 cells were treated with (0, 1, 5, 10, 20) μmol/L WIN, and cell viability was determined by CCK-8 assay. The morphological changes of the cells were observed under a fluorescence microscope with Hoechst33258 staining. Cell apoptosis was measured by flow cytometry combined with annexin V-FITC/PI staining. The expression levels of apoptosis-related proteins P53, P21, Bcl-2 and Bax, and the phosphorylated AKT (p-AKT) and phosphorylated extracellular signal-regulated kinase (p-ERK) were analyzed by Western blotting. Transwell(TM) invasion assay was used to detect cell invasion ability. Would healing assay was performed to test cell migration ability. The expression level of matrix metalloproteinase 14 (MMP-14) was evaluated by Western blotting. Results WIN inhibited the proliferation of SMMC-7721 cells and induced cell apoptosis in a dose-dependent manner. After treatment with WIN, the cell nucleus concentrated and broken, indicating obvious cell apoptosis. Western blotting exhibited an up-regulation in the protein expression of P53, P21 and Bax. And the anti-apoptotic protein Bcl-2 was repressed. The expression levels of AKT, p-AKT and p-ERK were down-regulated, whereas the expression of total ERK was not obviously changed. Compared with control group, there was a significant inhibition of cell invasion and migration abilities when SMMC-7721 cells were treated with WIN. The expression level of MMP-14 decreased as well. Conclusion WIN can inhibit the proliferation of SMMC-7721 cells and induce cell apoptosis. The mechanism is associated with the activation of P53 and the inhibition of AKT, p-AKT and p-ERK. WIN can inhibit the invasion and migration of SMMC-7721 cells through down-regulating the protein expression of MMP-14.”