* Withdrawal from long-term methamphetamine self-administration 'normalizes' neurometabolites in rhesus monkeys: a (1) H MR spectroscopy study.
- (1) H magnetic resonance spectroscopy has demonstrated alterations in several neurometabolites in methamphetamine (METH)-dependent individuals in brain regions implicated in addiction. Yet, it is unclear whether these neurochemicals return to homeostatic levels after an individual abstains from drug use, a difficult question to address due to high recidivism and poor study retention in human subjects. We thus utilized a non-human primate model of addiction to explore the effects of long-term drug exposure and withdrawal on brain neurochemistry. Ten rhesus macaque monkeys on an active METH self-administration protocol (average use 4.6 ± 0.8 years, average daily intake between 0.4 and 1.2 mg/kg) and 10 age- and sex-matched drug-naive controls (CONT) served as subjects. Concentrations of several neurochemicals were evaluated at several timepoints following withdrawal from drug availability (10 monkeys at 1 week and 1 and 3 months, and 6 monkeys at 6 and 12 months; CONT examined at one timepoint). At 1 week following METH withdrawal, we found increases in myo-inositol in anterior cingulate cortex in the METH group relative to CONT. These alterations showed a linear pattern of decreased levels ('normalization') by 1 year of abstinence. We also found decreases in glutamine and Glx (composed mainly of glutamate and glutamine) in the caudate-putamen of the same animals at early withdrawal that showed a similar linear pattern of increasing concentration by 1 year. These results demonstrate that despite protracted, long-term use, neurochemical changes seen following long-term drug administration do not persist following prolonged abstinence, suggesting therapeutic effects of long-term withdrawal from drug use.
=>設立する, 基礎づける
Overview of noun found
The noun found has 1 sense (first 1 from tagged texts)
1. (1) found -- (food and lodging provided in addition to money; "they worked for $30 and found")
Overview of verb found
The verb found has 3 senses (first 2 from tagged texts)
1. (9) establish, set up, found, launch -- (set up or found; "She set up a literacy program")
2. (4) establish, found, plant, constitute, institute -- (set up or lay the groundwork for;
"establish a new department")
3. establish, base, ground, found -- (use as a basis for; found on; "base a claim on some
observation")
Overview of verb find
The verb find has 16 senses (first 13 from tagged texts)
1. (159) find, happen, chance, bump, encounter -- (come upon, as if by accident; meet with; "We find
this idea in Plato"; "I happened upon the most wonderful bakery not very far from here"; "She
chanced upon an interesting book in the bookstore the other day")
2. (141) detect, observe, find, discover, notice -- (discover or determine the existence, presence,
or fact of; "She detected high levels of lead in her drinking water"; "We found traces of lead in
the paint")
3. (86) find, regain -- (come upon after searching; find the location of something that was missed
or lost; "Did you find your glasses?"; "I cannot find my gloves!")
4. (57) determine, find, find out, ascertain -- (establish after a calculation, investigation,
experiment, survey, or study; "find the product of two numbers"; "The physicist who found the
elusive particle won the Nobel Prize")
5. (57) find, feel -- (come to believe on the basis of emotion, intuitions, or indefinite grounds;
"I feel that he doesn't like me"; "I find him to be obnoxious"; "I found the movie rather
entertaining")
6. (45) witness, find, see -- (perceive or be contemporaneous with; "We found Republicans winning
the offices"; "You'll see a lot of cheating in this school"; "The 1960's saw the rebellion of the
younger generation against established traditions"; "I want to see results")
7. (41) line up, get hold, come up, find -- (get something or somebody for a specific purpose; "I
found this gadget that will serve as a bottle opener"; "I got hold of these tools to fix our
plumbing"; "The chairman got hold of a secretary on Friday night to type the urgent letter")
8. (34) discover, find -- (make a discovery, make a new finding; "Roentgen discovered X-rays";
"Physicists believe they found a new elementary particle")
9. (29) discover, find -- (make a discovery; "She found that he had lied to her"; "The story is
false, so far as I can discover")
10. (16) find -- (obtain through effort or management; "She found the time and energy to take care
of her aging parents"; "We found the money to send our sons to college")
11. (16) rule, find -- (decide on and make a declaration about; "find someone guilty")
12. (13) receive, get, find, obtain, incur -- (receive a specified treatment (abstract); "These
aspects of civilization do not find expression or receive an interpretation"; "His movie received a
good review"; "I got nothing but trouble for my good intentions")
13. (11) find -- (perceive oneself to be in a certain condition or place; "I found myself in a
difficult situation"; "When he woke up, he found himself in a hospital room")
14. recover, retrieve, find, regain -- (get or find back; recover the use of; "She regained control
of herself"; "She found her voice and replied quickly")
15. find -- (succeed in reaching; arrive at; "The arrow found its mark")
16. find oneself, find -- (accept and make use of one's personality, abilities, and situation; "My
son went to Berkeley to find himself")
Overview of adj found
The adj found has 1 sense (first 1 from tagged texts)
1. (1) found -- (come upon unexpectedly or after searching; "found art"; "the lost-and-found
department")
--- WordNet end ---