Tag Archives: THC

Does cannabis affect dopaminergic signaling in the human brain? A systematic review of evidence to date.

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“While abnormalities in multiple pathways may lead to schizophrenia, an abnormality in dopamine neurotransmission is considered to be the final common abnormality.

One would thus expect cannabis use to be associated with dopamine signaling alterations.

This is the first systematic review of all studies, both observational as well as experimental, examining the acute as well as chronic effect of cannabis or its main psychoactive ingredient, THC, on the dopamine system in man…

In man, there is as yet little direct evidence to suggest that cannabis use affects acute striatal dopamine release or affects chronic dopamine receptor status in healthy human volunteers. ”

http://www.ncbi.nlm.nih.gov/pubmed/26068702

The rat pineal gland comprises an endocannabinoid system.

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“In the mammalian pineal gland, the rhythm in melatonin biosynthesis depends on the norepinephrine (NE)-driven regulation of arylalkylamine N-acetyltransferase (AANAT), the penultimate enzyme of melatonin biosynthesis.

A recent study showed that phytocannabinoids like tetrahydrocannabinol reduce AANAT activity and attenuate NE-induced melatonin biosynthesis in rat pineal glands, raising the possibility that an endocannabinoid system is present in the pineal gland…

In summary, the pineal gland comprises indispensable compounds of the endocannabinoid system indicating that endocannabinoids may be involved in the control of pineal physiology.”

http://www.ncbi.nlm.nih.gov/pubmed/18554250

Marijuana kills brain cancer, new study confirms

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“The active molecules in cannabis kill brain cancer — another study has revealed.”

“Scientists using an extract of whole-plant marijuana rich in pot’s main psychoactive ingredient THC as well as cannabidiol (CBD) showed “dramatic reductions in tumor volumes” of a type of brain cancer.”  http://blog.sfgate.com/smellthetruth/2014/11/18/marijuana-kills-brain-cancer-new-study-confirms/

“Marijuana kills brain cancer, new study confirms. The active molecules in cannabis kill brain cancer — another study has revealed.” http://blog.seattlepi.com/marijuana/2014/11/18/marijuana-kills-brain-cancer-new-study-confirms/#13130101=0

“Marijuana Kills Brain Cancer Cells. Researchers have found that the THC in marijuana causes brain cancer cells to die in both mice and humans.”  http://www.nbcphiladelphia.com/news/health/Marijuana_Kills_Brain_Cancer_Cells_All__National_.html

“Marijuana Kills Brain Cancer, New Study Confirms” http://cancerguide.byethost8.com/marijuana-kills-brain-cancer-new-study-confirms-sfgate-blog/

http://www.thctotalhealthcare.com/category/brain-cancer/

Photosynthetic response of Cannabis sativa L., an important medicinal plant, to elevated levels of CO2

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“Cannabis sativa L. (Cannabaceae) is a widely distributed plant around the world. It has a long history of medicinal use as far back as the 6th century B.C. Cannabis sativa is the natural source of the cannabinoids, a unique group of terpeno-phenolic compounds that accumulate in the glandular trichomes of the plant.

Δ9-Tetrahydrocannabinolic acid (Δ9-THCA) is the major cannabinoid which upon decarboxylation with age or heating gives rise to Δ9-THC, the primary psychoactive agent. The pharmacologic and therapeutic potency of Cannabis preparations and Δ9-THC have been extensively reviewed.

Despite of its medicinal importance and widespread occurrence, to the best of our knowledge, no information is available on the consequences of rising atmospheric CO2 concentration on its photosynthesis and growth performance.

This study describes the short term effect of elevated CO2 on photosynthetic characteristics and stomatal response in four different high Δ9-THC yielding varieties of Cannabis sativa.

The higher water use efficiency (WUE) under elevated CO2 conditions in Cannabis sativa, primarily because of decreased stomatal conductance and subsequently the transpiration rate, may enable this species to survive under expected harsh greenhouse effects including elevated CO2 concentration and drought conditions.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3550578/

The effect of phytocannabinoids on airway hyper-responsiveness, airway inflammation, and cough.

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“Cannabis has been demonstrated to have bronchodilator, anti-inflammatory, and antitussive activity in the airways…

We compared the effects of Δ(9)-tetrahydrocannabinol, cannabidiol, cannabigerol, cannabichromene, cannabidiolic acid, and tetrahydrocannabivarin on contractions of the guinea pig-isolated trachea and bronchoconstriction induced by nerve stimulation or methacholine in anesthetized guinea pigs following exposure to saline or the proinflammatory cytokine, tumor necrosis factor α (TNF-α)…

Only Δ(9)-tetrahydrocannabinol inhibited TNF-α-enhanced vagal-induced bronchoconstriction, neutrophil recruitment to the airways, and citric acid-induced cough responses…

The other cannabinoids did not influence cholinergic transmission, and only Δ(9)-THC demonstrated effects on airway hyper-responsiveness, anti-inflammatory activity, and antitussive activity in the airways.”

http://www.ncbi.nlm.nih.gov/pubmed/25655949

Very low doses of delta 8-THC increase food consumption and alter neurotransmitter levels following weight loss.

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“We have investigated the effect of 0.001 mg/kg delta(8)-tetrahydrocannabinol (THC) on food consumption, cognitive function, and neurotransmitters in mice…

Cognitive function showed a tendency to improve in the THC-treated mice…

Delta(8)-THC increased food intake significantly more than did delta(9)-THC, while performance and activity were similar.

Thus, delta(8)-THC (0.001 mg/kg) caused increased food consumption and tendency to improve cognitive function, without cannabimimetic side effects.

Hence, a low dose of THC might be a potential therapeutic agent in the treatment of weight disorders.”

http://www.ncbi.nlm.nih.gov/pubmed/15099912

Targeting cannabinoid receptors as a novel approach in the treatment of graft-versus-host disease: evidence from an experimental murine model.

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“Allogeneic hematopoietic cell transplantation (HCT) is widely used to treat patients with life-threatening malignant and nonmalignant hematological diseases. However, allogeneic HCT often is accompanied by severe and lethal complications from graft-versus-host disease (GVHD)…

Cannabinoids, the active ingredients found in Cannabis sativa, have been shown to exhibit a wide range of pharmacological properties. Studies from our laboratory and elsewhere have suggested that cannabinoids exhibit potent anti-inflammatory properties and therefore can be used to treat autoimmune and inflammatory diseases.

Cannabinoids have been shown to inhibit tumor cell growth and angiogenesis, suggesting their potential use in the treatment of gliomas, prostate and breast cancers, and malignancies of immune origin.

Δ9-Tetrahydrocannabinol (THC) is one of the most extensively investigated ingredients found in cannabis. THC activates both CB1 and CB2, thereby mediating both psychotropic and anti-inflammatory properties.

Inasmuch as our previous studies suggested that THC exhibits anti-inflammatory and immunosuppressive properties, we tested the possibility of its use in treating GVHD in a parent → F1 model. We hereby demonstrate for the first time that administration of THC during allogeneic transplantation can significantly suppress GVHD…

Our results demonstrate for the first time that targeting cannabinoid receptors may constitute a novel treatment modality against acute GVHD.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3164345/

Δ9-Tetrahydrocannabinol attenuates allogeneic host-versus-graft response and delays skin graft rejection through activation of cannabinoid receptor 1 and induction of myeloid-derived suppressor cells.

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“Immune cells have been shown to express cannabinoid receptors and to produce endogenous ligands. Moreover, activation of cannabinoid receptors on immune cells has been shown to trigger potent immunosuppression.

Despite such studies, the role of cannabinoids in transplantation, specifically to prevent allograft rejection, has not, to our knowledge, been investigated previously. In the current study, we tested the effect of THC on the suppression of HvGD as well as rejection of skin allografts…

Together, our research shows, for the first time to our knowledge, that targeting cannabinoid receptors may provide a novel treatment modality to attenuate HvGD and prevent allograft rejection.”

http://www.ncbi.nlm.nih.gov/pubmed/26034207

Synergy between cannabidiol, cannabidiolic acid, and Δ⁹-tetrahydrocannabinol in the regulation of emesis in the Suncus murinus (house musk shrew).

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“Smoked marijuana contains over 100 different cannabinoids, including the psychoactive compound Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD).

THC, CBD, and its acidic precursor, cannabidiolic acid (CBDA), have all been shown to have antiemetic properties in the Suncus murinus.

Here we show that when subthreshold antiemetic doses of CBD or CBDA are combined with a subthreshold antiemetic dose of THC in the S. murinus, both lithium-chloride-induced vomiting and abdominal retching are dramatically suppressed.

These results suggest that combined effects of these compounds may lead to better control of vomiting with fewer side effects.”

http://www.ncbi.nlm.nih.gov/pubmed/26030435

http://www.thctotalhealthcare.com/category/nauseavomiting/