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Tissue glutathione and cysteine levels in methionine-restric

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Guest
Posted: Fri Sep 23, 2005 3:52 pm
Nutrition. 2004 Sep;20(9):800-5. Related Articles, Links


Tissue glutathione and cysteine levels in methionine-restricted rats.

Richie JP Jr, Komninou D, Leutzinger Y, Kleinman W, Orentreich N,
Malloy V, Zimmerman JA.

Division of Epidemiology and Cancer Susceptibility, American Health
Foundation Cancer Center, Institute for Cancer Prevention, Valhalla, NY
10595, USA. jrichie@ifcp.us

OBJECTIVE: Previously, we demonstrated that lifelong methionine (Met)
restriction (MR) increases lifespan, decreases the incidence of
aging-related diseases, increases blood glutathione (GSH) levels, and
prevents loss of GSH during aging in rats. Our present objective was to
elucidate the effects of MR on GSH metabolism and transport by
determining the time course and nature of GSH and cysteine changes in
blood and other tissues in young and mature rats. METHODS: Male F-344
rats were placed on control (0.86% Met) or MR (0.17% Met) defined amino
acid diets at age 7 wk and killed at different times thereafter. MR was
also initiated in adult (12-mo-old) rats. RESULTS: Throughout the first
2 mo of MR, blood GSH levels increased 84% and liver GSH decreased 66%
in relation to controls. After this period, liver GSH levels remained
constant through at least 6 mo. GSH levels also decreased in the
pancreas (80%) and kidney (22%) but remained unchanged in other tissues
examined after 11 wk of MR. The increase in blood GSH was evident as
soon as 1 wk after initiating MR and reached a plateau by 6 wk. A
similar increase in erythrocyte GSH levels was observed when MR was
administered to mature adult rats. Fasting decreased liver GSH in
controls but had no further effect in MR animals. By 1 mo, cysteine
levels had decreased in all tissues except brain. CONCLUSION: These
results suggest that adaptive changes occur in the metabolism of Met,
cysteine, and/or GSH as a result of MR in young and adult rats. These
early metabolic changes lead to conservation of GSH levels in most
extrahepatic tissues and increased GSH in erythrocytes by depleting
liver GSH to a critical level.

PMID: 15325691 [PubMed - indexed for MEDLINE]
 
Guest
Posted: Sun Sep 25, 2005 9:57 pm
Does this mean that supplementing with S-AME, which puts methionine
into the body, can have bad effects?
 
Paul Antonik Wakfer
Posted: Mon Sep 26, 2005 2:41 pm
Guest
gehayw@hotmail.com wrote:

Quote:
Does this mean that supplementing with S-AME, which puts methionine
into the body, can have bad effects?

No, Methionine is an essential amino acid obtained from many food sources.
The amount that would be obtained by conversion from supplemental SAMe
would be insignificant compared with dietary intake.

--Paul Wakfer

MoreLife for the rational - http://morelife.org
Reality based tools for more life in quantity and quality
The Self-Sovereign Individual Project - http://selfsip.org
Rational freedom by self-sovereignty & social contracting
 
cruiser
Posted: Thu Oct 06, 2005 10:03 pm
Guest
<gehayw@hotmail.com> wrote in message
news:1127707067.530814.202300@g44g2000cwa.googlegroups.com...
Quote:
Does this mean that supplementing with S-AME, which puts methionine
into the body, can have bad effects?

Maybe.


Just supplementing SAMe is not a good idea. SAMe is part of a chemical
cycle. SAMe is at the top of the cycle. After SAMe has made a methyl
donation, and another chemical donation, to fire up many chemical processes
in the body, it ends up as homocysteine. That is the bottom of the cycle.
Homocysteine is burnt out SAMe. Elevated homocysteine levels indicate health
problems, current and future.

Homocysteine can be eliminated quickly, by using B12, TMG, and zinc. TMG can
come from cholin, but you can take it as TMG. TMG, folic acid, B12 are all
methyl donors.
They will re-methylize the homocysteine, and with a bit of chemical slight
of hand, you have SAMe. You turn the bad stuff back into the good stuff.

You have to turn the cycle over. It is no good pouring SAMe in at the top of
the cycle, because if the cycle does not turn over, it all just accumulates
at the bottom of the cycle as homocysteine. You need to turn the cycle over
and help your body make its own SAMe, out homocysteine.

You can feed the cycle some methionine, to prevent depletion, due to
glutathione formation, by the B6 pathway, and cysteine loss to RNA
synthesis. Or you can take some NAC which is both a methyl and sulfur donor.

B12, TMG, zinc, N-Acetyl-Cysteine.

TMG is also good for RNA and DNA, since they tend to use a lot of methyl
groups. And Tri-Methyl-Glycine can contribute three methyl groups and strips
to glycine, which is also used to make RNA.

Strongly, recommend B12 in the Methyl-Cobalamin sublingual form. Some people
have B12 absoption problems, due to a shortage of HCl or GIF.
Methyl-cobalamin sublingual bypasses absoption problems, and does not need
to be coverted. That is its active form.
Cyanocobalamin, releases cyanide to become active, and robs a methyl group.

You can also take Folic acid, instead of TMG to convert homocysteine, and
should take folic acid too, since it is needed for RNA synthesis. However,
again the folic acid commonly used is not methylated and must rob methyl
groups from other processes to be activated. TMG can help activate the folic
acid, by donating some methyl groups. TMG can do the job of re-methylating
homocysteine, without being converted or activated. TMG is the active form.

I really don't understand the rational behind taking methyl donors without
their methyl groups to donate. Merck makes an activated methylfolate that
sells as Metafolate, to supplement makers. It is not allowed in
Canada.(idiots)

However, folic acid, like SAMe, is a methyl donor. These both are
specifically involved in initiating chemical processes, by donating a methyl
group. Folic acid has the important job of helping to make RNA. If you are
short of folic acid, due to high demands for converting homocysteine, RNA
production can suffer.

RNA has been called "life force", It does all the work of making proteins
etc. RNA is like all the little workers in your body, building things. DNA
is a sort of reference library for RNA. If you run short of RNA, you run
short of workers to make things in you body. You get run down. Your body
cannot keep up with the insults and stresses. Your health declines, mentally
and physically.

Cruiser
 
Cruiser
Posted: Fri Oct 07, 2005 7:30 am
Guest
Here are some good references.

These are a strongly recommended read.

http://www.enzymestuff.com/methylation.htm

http://www.nutriwest.com/articles/homovmsm.htm

http://www.newtreatments.org/fromweb/sulfur.html

http://www.healthandage.com/html/min/iananda/content/jnha_v6n1_folate.htm

http://www.thorne.com/altmedrev/fulltext/meth1-4.html

http://www.strokedoctor.com/vitamin_b12.htm

Note: I take NAC with molybdenum and selenium added.

Cruiser
 
just Ed
Posted: Fri Oct 07, 2005 9:46 am
Guest
cruiser wrote:
<Snip>
Quote:
I really don't understand the rational behind taking methyl donors without
their methyl groups to donate. Merck makes an activated methylfolate that
sells as Metafolate, to supplement makers. It is not allowed in
Canada.(idiots)
snip


There are signs that many of us lower hcy & mortality with folic sup.
maybe that's just from poor diet, but I know of no broad advantage of
Metafolate over cheap folic acid.

The last time I looked, I found two studies comparing them:
(full texts avail on both)

PMID: 10859289 Controlled comparison of L-5-methyltetrahydrofolate
versus folic acid for the treatment of hyperhomocysteinemia in
hemodialysis patients.
(15mg folic acid matched the performance of 17mg MTHF)


PMID: 14985224 Supplementation with [6S]-5-methyltetrahydrofolate or
folic acid equally reduces plasma total homocysteine concentrations
in healthy women.
"The decrease in tHcy did not differ significantly between the 3
supplemented groups" 208ug MTHF, 416 ug MTHF, 400 ug folic acid"

(see table 2 of the full text for no difference in steady state
plasma folate which is Merck's erroneous attempt to scare us
into buying this stuff)
B6 & B12 were also supplemented in this study.


The much higher cost of Metafolate over folic acid is many times
more expensive than getting sup. methyl groups from TMG, creatine
or choline.

my waffle-wording "broad advantage" above is intended to except
rare special cases like the hemodialysis patients where protein
intake needs to be limited (advantage over TMG).

Ed
 
SDer
Posted: Fri Oct 07, 2005 11:42 am
Guest
"cruiser" <tg.cruisers@sympatico.ca> wrote in
news:3fm1f.8350$2F2.992190@news20.bellglobal.com:

Quote:
gehayw@hotmail.com> wrote in message
news:1127707067.530814.202300@g44g2000cwa.googlegroups.com...
Does this mean that supplementing with S-AME, which puts methionine
into the body, can have bad effects?

Maybe.

Just supplementing SAMe is not a good idea. SAMe is part of a chemical
cycle. SAMe is at the top of the cycle. After SAMe has made a methyl
donation, and another chemical donation, to fire up many chemical
processes in the body, it ends up as homocysteine. That is the bottom
of the cycle. Homocysteine is burnt out SAMe. Elevated homocysteine
levels indicate health problems, current and future.

Homocysteine can be eliminated quickly, by using B12, TMG, and zinc.
TMG can come from cholin, but you can take it as TMG. TMG, folic
acid, B12 are all methyl donors.
They will re-methylize the homocysteine, and with a bit of chemical
slight of hand, you have SAMe. You turn the bad stuff back into the
good stuff.

You have to turn the cycle over. It is no good pouring SAMe in at the
top of the cycle, because if the cycle does not turn over, it all just
accumulates at the bottom of the cycle as homocysteine. You need to
turn the cycle over and help your body make its own SAMe, out
homocysteine.

You can feed the cycle some methionine, to prevent depletion, due to
glutathione formation, by the B6 pathway, and cysteine loss to RNA
synthesis. Or you can take some NAC which is both a methyl and sulfur
donor.

B12, TMG, zinc, N-Acetyl-Cysteine.

TMG is also good for RNA and DNA, since they tend to use a lot of
methyl groups. And Tri-Methyl-Glycine can contribute three methyl
groups and strips to glycine, which is also used to make RNA.

Strongly, recommend B12 in the Methyl-Cobalamin sublingual form. Some
people have B12 absoption problems, due to a shortage of HCl or GIF.
Methyl-cobalamin sublingual bypasses absoption problems, and does not
need to be coverted. That is its active form.
Cyanocobalamin, releases cyanide to become active, and robs a methyl
group.

You can also take Folic acid, instead of TMG to convert homocysteine,
and should take folic acid too, since it is needed for RNA synthesis.
However, again the folic acid commonly used is not methylated and must
rob methyl groups from other processes to be activated. TMG can help
activate the folic acid, by donating some methyl groups. TMG can do
the job of re-methylating homocysteine, without being converted or
activated. TMG is the active form.

I really don't understand the rational behind taking methyl donors
without their methyl groups to donate. Merck makes an activated
methylfolate that sells as Metafolate, to supplement makers. It is not
allowed in Canada.(idiots)

However, folic acid, like SAMe, is a methyl donor. These both are
specifically involved in initiating chemical processes, by donating a
methyl group. Folic acid has the important job of helping to make RNA.
If you are short of folic acid, due to high demands for converting
homocysteine, RNA production can suffer.

RNA has been called "life force", It does all the work of making
proteins etc. RNA is like all the little workers in your body,
building things. DNA is a sort of reference library for RNA. If you
run short of RNA, you run short of workers to make things in you body.
You get run down. Your body cannot keep up with the insults and
stresses. Your health declines, mentally and physically.

Cruiser





This was very interesting. Should NAC be accompanied by something as
well? like glutamine or selenium perhaps?
 
cruiser
Posted: Sun Oct 09, 2005 4:43 pm
Guest
----- Original Message -----
From: "SDer" <sder@noland.com>
Newsgroups: sci.life-extension
Sent: Friday, October 07, 2005 5:42 PM
Subject: Re: Tissue glutathione and cysteine levels in methionine-restricted
rats.


Quote:

This was very interesting. Should NAC be accompanied by something as
well? like glutamine or selenium perhaps?

The one that I use also contains 50mcg Molybdenum and 25mcg selenium.

Cruiser
 
 
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