Neuroprotective Effect of(−)Δ9-Tetrahydrocannabinol and Cannabidiol in N-Methyl-d-Aspartate-Induced Retinal Neurotoxicity

Posted on February 26, 2015 by David

“In glaucoma, the increased release of glutamate is the major cause of retinal ganglion cell death. Cannabinoids have been demonstrated to protect neuron cultures from glutamate-induced death.

In this study, we test the hypothesis that glutamate causes apoptosis of retinal neurons via the excessive formation of peroxynitrite, and that the neuroprotective effect of the psychotropic Δ9-tetrahydroxycannabinol (THC) or nonpsychotropic cannabidiol (CBD) is via the attenuation of this formation…

The neuroprotection by THC and CBD was because of attenuation of peroxynitrite.

The effect of THC was in part mediated by the cannabinoid receptor CB1.

These results suggest the potential use of CBD as a novel topical therapy for the treatment of glaucoma.

THC and CBD, are similarly potent antioxidants that protect neuron cultures from glutamate-induced cell death or oxidative stress…

In addition to possessing neuroprotective or retinal neuroprotective activity… cannabinoids, such as THC, have been demonstrated to induce dose-related reductions in intraocular pressure in human and in animal models.

This suggests that cannabinoids may offer a multifaceted therapy for glaucoma.

In conclusion, our results indicate that lipid peroxidation and ONOO− formation play an important role in NMDA-induced retinal neurotoxicity and cell loss in the retina, and that THC and CBD, by reducing the formation of these compounds, are effective neuroprotectants.

The present studies could form the basis for the development of new topical therapies for the treatment of glaucoma.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1892413/

http://www.thctotalhealthcare.com/category/glaucoma-2/

Intraocular pressure, ocular toxicity and neurotoxicity after administration of cannabinol or cannabigerol.

Posted on October 5, 2014 by David

“Cannabinol or cannabigerol was administered to cats topically in doses of 250, 500 and 1000 micrograms as a single drop or chronically via osmotic minipumps (20 micrograms hr-1) over a period of 9 days. While cannabinol had a modest effect on intraocular pressure after a single dose, it caused a more significant reduction in ocular tension during chronic administration. Cannabigerol had similar effects, but the magnitude of response to its chronic administration was greater. Cannabinol but not cannabigerol caused conjunctival erythema and hyperemia. After systemic administration of cannabinol (20, 40 or 80 mg kg-1) to rats, 8-13 Hz polyspike discharges appeared in the electrocorticogram during wakefulness and during rapid eye movement sleep episodes. Cannabigerol (10, 30 and 100 mg kg-1) lacked this effect.

These results indicate that chronic administration of these cannabinoids lowers ocular tension considerably.

Like marihuana and delta-9-tetrahydrocannabinol, cannabinol produced both ocular toxicity and neurotoxicity. As cannabigerol lacked these toxicities, it appears that the ocular hypotensive effect of this cannabinoid is somewhat dissociable from both the adverse central and ocular effects accompanying marihuana intake.”

http://www.ncbi.nlm.nih.gov/pubmed/6499952

A comparison of the ocular and central effects of delta 9-tetrahydrocannabinol and cannabigerol.

Posted on October 5, 2014 by David

“Both delta 9-tetrahydrocannabinol (delta 9-THC) and cannabigerol, two naturally occurring marihuana cannabinoids, produced only a modest fall in intraocular pressure after acute topical application to the eyes of cats.

After chronic administration unilaterally to the cornea via Alzet osmotic minipumps and connecting extraocular cannulas, however, a considerable fall in ocular tension amounting to 4 to 7 mm Hg occurred. After systemic administration of delta 9-THC to rats, polyspike discharges appeared in the cortical electroencephalogram initially during wakefulness and behavioral depression. These polyspikes subsequently became evident within rapid eye movement sleep episodes. Cannabigerol was devoid of this effect. After removal of either sympathetic or parasympathetic input to the eyes of cats, the intraocular pressure lowering effect of delta 9-THC was not changed. Neither delta 9-THC nor cannabigerol altered the rate of formation of aqueous humor. On the other hand, both cannabinoids produced a two-to three-fold increase in aqueous outflow facility.

These results suggest that cannabigerol and related cannabinoids may have therapeutic potential for the treatment of glaucoma.”

http://www.ncbi.nlm.nih.gov/pubmed/1965836

Cannabinoids: a novel treatment for glaucoma

Posted on August 21, 2014 by David

Acta Ophthalmologica

“…cannabinoids are emerging novel agents for the treatment of glaucoma.

Although increased intraocular pressure (IOP) is a risk factor, associated retinal damage is of prime concern. This study determines the ability of cannabinoids to decrease IOP and confer neuroprotection…

Conclusion: Topically applied cannabinoids are effective agents that reduce IOP and confer neuroprotection and are prime candidates for potential glaucoma treatment.”

http://onlinelibrary.wiley.com/doi/10.1111/j.1755-3768.2014.T022.x/abstract

http://www.thctotalhealthcare.com/category/glaucoma-2/

Medical Marijuana Helps Cure Chronic Disease

Posted on June 21, 2014 by David

Medical Marijuana Helps Cure Chronic Disease

“The medicinal power of Marijuana is well documented throughtout history

Back in 2700 BC, According to Chinese lore, the Emperor Shen Nung, considered the Father of Chinese medicine, in 2700 BC ,discovered the healing properties of Marijuana as well as Ginseng and Ephedra.

Throughout recorded history, the use of Medical Marijuana has been linked to the ancient Egyptians, Persians, Greek civilizations, George Washington, Queen Victoria and even mainstream medicine by the 1840s.

From the 1850s to Y 1942, Marijuana was listed in the United States Pharmacopeia, an official public standards-setting authority for all prescription and over-the counter medicines, as a treatment for tetanus, cholera, rabies, dysentery, alcoholism, opiate addiction, convulsive disorders, insanity, excessive menstrual bleeding and many other health problems. My father was a Dental doctor and had a license to dispense the drug, pharmacies carried it back then.

During that same time frame prohibition gained popularity, that along with a growing “faith” in federal government.

By Y 1937, the United States passed its 1st federal law against Marijuana despite objections by the American Medical Association (AMA).

In fact, Dr. William C. Woodward, testifying on behalf of the AMA, told the US Congress:

“The American Medical Association knows of no evidence that Marijuana is a dangerous drug.”

He warned that a prohibition “loses sight of the fact that future investigation may show that there are substantial medical uses for Cannabis.”

Today, we see a growing trend of acceptance of Marijuana for its medicinal purposes.

Dr. Sanjay Gupta, CNN’s chief medical correspondent, reversed his Y 2009 opinion against Marijuana when he said, “We have been terribly and systematically misled for nearly 70 yrs in the United States, and I apologize for my own role in that.”

Now people including lawmakers are seeing the legalization of Marijuana in states like Colorado and Washington for “recreational” purposes. Most Americans are in favor of Medical Marijuana, and the legalization of this drug.

The Big Q: why does the federal government want to ban its usage?

The Big A: it is all about control and money, and there is a major market for it, plus it poses a major threat to the pharmaceutical industry.

Below are just a few of the many health benefits associated with Medical Marijuana:

1. It can stop HIV from spreading throughout the body.
2. It slows the progression of Alzheimer’s.
3. It slows the spread of cancer cells.
4. It is an active pain reliever.
5. It can prevent or help with opiate addiction.
6. It combats depression, anxiety and ADHD.
7. It can treat epilepsy and Tourette’s.
8. It can help with other neurological damage, such as concussions and strokes.
9. It can prevent blindness from glaucoma.
10. Its connected to lower insulin levels in diabetics.

Contrary to popular notions, many patients experience health benefits from Medical Marijuana without “getting stoned.””

http://www.livetradingnews.com/medical-marijuana-helps-cure-chronic-disease-55569.htm#.U6VjgZRX-uY

Neuroprotective effects of the cannabinoid agonist HU210 on retinal degeneration.

Posted on February 6, 2014 by David

“Cannabinoids have been demonstrated to exert neuroprotective effects on different types of neuronal insults.

Here we have addressed the therapeutic potential of the synthetic cannabinoid HU210 on photoreceptor degeneration, synaptic connectivity and functional activity of the retina in the transgenic P23H rat, an animal model for autosomal dominant retinitis pigmentosa (RP)…

These data suggest that cannabinoids are potentially useful to delay retinal degeneration in RP patients.”

http://www.ncbi.nlm.nih.gov/pubmed/24495949

Therapeutic potential of cannabinoid medicines.

Posted on September 6, 2013 by David

Drug Testing and Analysis

“Cannabis was extensively used as a medicine throughout the developed world in the nineteenth century but went into decline early in the twentieth century ahead of its emergence as the most widely used illicit recreational drug later that century. Recent advances in cannabinoid pharmacology alongside the discovery of the endocannabinoid system (ECS) have re-ignited interest in cannabis-based medicines.

The ECS has emerged as an important physiological system and plausible target for new medicines. Its receptors and endogenous ligands play a vital modulatory role in diverse functions including immune response, food intake, cognition, emotion, perception, behavioural reinforcement, motor co-ordination, body temperature, wake/sleep cycle, bone formation and resorption, and various aspects of hormonal control. In disease it may act as part of the physiological response or as a component of the underlying pathology.

In the forefront of clinical research are the cannabinoids delta-9-tetrahydrocannabinol and cannabidiol, and their contrasting pharmacology will be briefly outlined. The therapeutic potential and possible risks of drugs that inhibit the ECS will also be considered. This paper will then go on to review clinical research exploring the potential of cannabinoid medicines in the following indications: symptomatic relief in multiple sclerosis, chronic neuropathic pain, intractable nausea and vomiting, loss of appetite and weight in the context of cancer or AIDS, psychosis, epilepsy, addiction, and metabolic disorders.”

http://www.ncbi.nlm.nih.gov/pubmed/24006213

http://onlinelibrary.wiley.com/doi/10.1002/dta.1529/abstract

Doctor: Marijuana is a needed option

Posted on August 26, 2013 by David

“There was a personal reason why Dr. Gary Blick became one of the nearly 100 physicians in the state who are licensed to prescribe medical marijuana.”I did this because my 91-year-old mother, who has glaucoma,” he said. “Her glaucoma eye drops had failed to produce the desired results and she was facing surgery.”

Glaucoma is a disease in which the eye typically has excessive internal pressure, damaging the nerve fibers of the retina, the delicate tissue at the back of the eye that’s sensitive to light and color.

“She was needing surgery to repair her eyes,” he said. “But after we started her on medical marijuana, her pressures dropped, and when she stopped smoking marijuana, the pressures went back up again.”

He said her testimony in Hartford last year had the legislative committee considering the bill “in stitches,” even though her testimony countered testimony of the president of the Connecticut Society of Eye Physicians, who said marijuana would not be helpful to glaucoma patients.

“So one of the senators said, `Are you aware of Gloria Blick‘s testimony?’ To which he replied, `Well, I guess it would help some people.’ To which the senator replied, `Isn’t that what we’re here for?’ ”

Blick sees medical marijuana as just one of the arsenal of options that physicians should have to ease pain and provide relief for various diseases.”

More: http://www.ctpost.com/local/article/Doctor-Marijuana-is-a-needed-option-4740995.php#src=fb

Cannabinoid Receptor CB2 Modulates Axon Guidance.

Posted on August 21, 2013 by David

“Navigation of retinal projections towards their targets is regulated by guidance molecules and growth cone transduction mechanisms. Here, we present in vitro and in vivo evidences that the cannabinoid receptor 2 (CB2R) is expressed along the retino-thalamic pathway and exerts a modulatory action on axon guidance….

Overall, this study demonstrates that the contribution of endocannabinoids to brain development is not solely mediated by CB1R, but also involves CB2R.”

http://www.ncbi.nlm.nih.gov/pubmed/23951024

Poly-ε-caprolactone microspheres as a drug delivery system for cannabinoid administration: development, characterization and in vitro evaluation of their antitumoral efficacy.

Posted on June 19, 2013 by David

“Cannabinoids show promise for the treatment of various medical conditions such as emesis, anorexia, pain, cancer, multiple sclerosis, Parkinson’s disease and glaucoma.

The objective of the present work was to assess the feasibility of developing cannabinoid loaded poly-ε-caprolactone (PCL) microparticles prepared by the oil-in-water emulsion-solvent evaporation technique as a suitable dosage form for their administration.

In vitro cell viability studies demonstrated the antitumoral activity of CBD released from microparticles. After 4 and 7 days of incubation, CBD in microspheres significantly inhibited the growth of MDA-MB-231 cells by 60% as compared to the 50% attained with free drug.

The results suggest that PCL microparticles could be an alternative delivery system for long-term cannabinoid administration, showing potential therapeutic advantages over free drug.”

http://www.ncbi.nlm.nih.gov/pubmed/22580111