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Machinery Of The 'Marijuana Munchies'
Science Daily ^ | December 26, 2005

Posted on 12/27/2005 7:26:46 AM PST by billorites

Marijuana--or more specifically its active ingredient, tetrahydrocannabinol--has a well-documented tendency to stimulate hunger. And while scientists have traced this property to cannabinoid receptors in the brain, they have had little understanding of the neural circuitry underlying this effect.

Understanding this circuitry has important practical implications because blocking the cannabinoid receptor, CB1, offers a promising approach to treating obesity. One such compound, rimonabant (trade name AcompliaTM) is already undergoing clinical testing.

In an article in the December 22, 2005, issue of Neuron, Young-Hwan Jo and colleagues report how the circuitry of CB1 is integrated with signaling by the appetite-suppressing hormone leptin. The CB1 receptor is normally triggered by natural regulatory molecules, called endocannabinoids.

In their studies, the researchers concentrated on the lateral hypothalamus (LH) of the brain, known to be a center of control of food intake. Their studies involved detailed electrophysiological measurements of the effects of specific neurons that they had identified in previous studies as being important in endocannabinoid signaling.

Their studies revealed that activation of CB1 receptors, as by endocannabinoid molecules, induced these neurons to be rendered more excitable by a mechanism called "depolarization-induced suppression of inhibition" (DSI).

What's more, they found that leptin inhibits DSI. However, they found that leptin did not interfere with the CB1 receptors themselves. Rather, leptin "short-circuits" the endocannabinoid effects by inhibiting pore-like channels in the neurons that regulate the flow of calcium into the neurons. Such calcium is necessary for the synthesis of endocannabinoids.

In further studies of mice genetically altered to be leptin deficient, the researchers found the DSI to be more prolonged than in normal mice. Thus, they said, the findings "implicate this mechanism for leptin receptor/endocannabinoid signaling in contributing to the maintenance of weight balance...." The researchers also included that "upregulation of endocannabinoid signaling in the LH may explain, at least in part, the increased body weight consistent with a prior report of elevated endocannabinoids" in such leptin-deficient mice.

The researchers concluded that their findings "are consistent with the hypothesis that the integration of endocannabinoid and leptin signaling regulates the excitability of neurons on appetite-related circuits."

They also wrote that "the cellular mechanisms of recently developed antiobesity drugs, such as rimonabant, may include decreased endocannabinoid signaling and hence decreased excitability of LH circuits related to appetite, even in the context of leptin insufficiency or resistance."


TOPICS: Heated Discussion
KEYWORDS: marijuana; medicalmarijuana; potheads; wodlist
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To: Protagoras
They made me do it! They made me post like that!

WODdies aren't big on personal responsibility.

101 posted on 12/27/2005 9:05:29 AM PST by Know your rights (The modern enlightened liberal doesn't care what you believe as long as you don't really believe it.)
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To: sandbar

I think his tagline says it all.


102 posted on 12/27/2005 9:05:41 AM PST by Woman on Caroline Street (Go sell crazy somewhere else. We're all stocked up here.)
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To: Clint N. Suhks
Yet more Liberaltarian palaver...the 10th amendment trumps the 9th.

Horsefeathers. No amendment of the Bill of Rights can trump another, they were passed at the same time, as a package.

Now the real question is whether the 9th amendment binds the state governments. Rights reserved to the people verses powers reserved to the states. Oh, and to the people. People have powers and rights, governments only have powers.

Several states have passed laws semi-legalizing the use of marijuana for medical purposes. The Feds have overridden them at every turn. So much for both the 9th and 10th amendments, as far as the drug warriors are concerned.

103 posted on 12/27/2005 9:06:40 AM PST by El Gato
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To: billorites

bump for later


104 posted on 12/27/2005 9:07:22 AM PST by bassmaner (Let's take the word "liberal" back from the commies!!)
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To: albertp; Allosaurs_r_us; Abram; AlexandriaDuke; Americanwolf; Annie03; Baby Bear; bassmaner; ...
Libertarian ping.To be added or removed from my ping list freepmail me or post a message here
105 posted on 12/27/2005 9:07:27 AM PST by freepatriot32 (Holding you head high & voting Libertarian is better then holding your nose and voting republican)
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To: Know your rights
(And if used from a vaporizer rather than smoked it doesn't have the ill effects of smoking.)

And, you still get stoned. :)

106 posted on 12/27/2005 9:08:51 AM PST by ppaul
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Everybody must get stoned...
107 posted on 12/27/2005 9:09:54 AM PST by ppaul
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To: ppaul
And, you still get stoned. :)

There are worse side effects for a medicine to have.

108 posted on 12/27/2005 9:11:56 AM PST by Know your rights (The modern enlightened liberal doesn't care what you believe as long as you don't really believe it.)
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To: Know your rights

If the morbidly obese had willpower to do anything besides overeat, they wouldn't be morbidly obese.


109 posted on 12/27/2005 9:12:48 AM PST by 308MBR (Not only older, but bolder. Merry Christmas and a Happy New Year.)
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To: PJ-Comix
Um...I think something in the OTHER direction is needed. Suppression of the appetite.

Administer as needed.


110 posted on 12/27/2005 9:13:14 AM PST by M203M4 ( MERRY BOXING DAY)
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To: Know your rights
"If you can show that the numerical increase in drug users is not substantially larger than the number of persons released by the Community Mental Health Centers Act,

That's a silly question to attempt to answer 40 years later. Nevertheless, the drug problems in the USA and its creation of a world wide market in drugs is the result of both the USA, Canada and Western Europe attempting to treat the mentally ill on a community based, out-patient basis. From Sarah Jane Moore to Mark Chapman, to David Hinkley and Patrick Purdy, of the Stockton School yard Massacre, all were mental patients being treated at a community clinic.

111 posted on 12/27/2005 9:16:04 AM PST by elbucko
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To: sandbar
Mostly because if a person is drug tested and there is presence of marijuana they are considered DWI. Even if that intoxication occured last week sometime, it still shows in your system.

Fortunately, like with alcohol, there would be a level test. Heck a large fraction the population could probably get a positive indication for MJ, just by second hand smoke in the halls and public areas of businesses and residences such as apartment buildings.

112 posted on 12/27/2005 9:18:33 AM PST by El Gato
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To: elbucko
If you can show that the numerical increase in drug users is not substantially larger than the number of persons released by the Community Mental Health Centers Act,

That's a silly question to attempt to answer 40 years later. Nevertheless, the drug problems in the USA and its creation of a world wide market in drugs is the result of both the USA, Canada and Western Europe attempting to treat the mentally ill on a community based, out-patient basis.

So you have no evidence but you'll make the claim anyway. Typical Drug War 'logic.'

From Sarah Jane Moore to Mark Chapman, to David Hinkley and Patrick Purdy, of the Stockton School yard Massacre, all were mental patients being treated at a community clinic.

And they were all pot smokers? Or are you dragging in red herrings?

113 posted on 12/27/2005 9:18:50 AM PST by Know your rights (The modern enlightened liberal doesn't care what you believe as long as you don't really believe it.)
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To: elbucko
Moron is as good as any for hose who propose the legalization of drugs before the national problem of the homeless and mentally ill on the street is addressed.

Keep hitting that one piano key, my friend.

114 posted on 12/27/2005 9:19:16 AM PST by Hemingway's Ghost (Spirit of '75)
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To: 308MBR
Could be ... but I'd rather have a medicine be available than have lack of willpower be a death sentence.
115 posted on 12/27/2005 9:19:47 AM PST by Know your rights (The modern enlightened liberal doesn't care what you believe as long as you don't really believe it.)
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To: elbucko

>>>So shove your, "Why are you here?" where it belongs, you friggin ignorant moron!>>>

I have reported you for abuse.

Questioning your reason for being on a conservative website when you obviously have a thing for limiting freedoms of private citizens is not quite the same as calling you an ignorant moron.


116 posted on 12/27/2005 9:22:23 AM PST by sandbar
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To: Know your rights
WODdies aren't big on personal responsibility.

Actually, I think the War on Drugs is a bad policy. Money spent and wasted on a futile effort. Better the money had been spent on mental facilities.

117 posted on 12/27/2005 9:23:40 AM PST by elbucko
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To: Xenalyte

why even bother with some of nutty responses, Like spitting into a tornado.......stay safe


118 posted on 12/27/2005 9:24:19 AM PST by vin-one (REMEMBER the WTC !!!!!!!!)
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To: Hemingway's Ghost
Keep hitting that one piano key, my friend.

I will. It's the only one in tune.

119 posted on 12/27/2005 9:28:11 AM PST by elbucko
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To: elbucko
The mentally ill are the reason that the 2nd Amendment is being infringed. Or is that too high a concept to wrap your drug addled brain around?

Again, horsefeathers. The second amendment is being infringed because the notion of an armed populace scares many politicians, and for good reason I might add. Now, they use the rise in crime and drug abuse as an excuse, but it's not the real reason. In fact, as we know, crime drops when the law abiding are armed.

The attacks on the second amendment started well before the '63 law that you cite. The first major attack at the federal level came in the 1930s, with the passage of the ('34) National Firearms Act, and the ('38) Federal Firearms Act. For those, especially the former, they used the crime caused by the prohibition of alcohol as the excuse, even though by then, prohibition had been repealed, although the crime syndicates remained. Then there was the 1968 Gun Control Act, which was passed using as the excuse events that happened after your '63 law, but not so much after that the societal effects had yet had enough time to grow enough to be really be noticeable.

120 posted on 12/27/2005 9:29:34 AM PST by El Gato
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