Psychomotor stimulant drugs of abuse cause brain damage that is dependent on elevated body temperature. This year, we continued to examine brain and body temperature changes in relation to the permeability of brain-blood barrier during exposure to meth-amphetamine. We found that meth-amphetamine induces the leakage of brain-blood barrier and the degree of this leakage depends on drug-induced increase of brain temperature. This year, in collaboration with Dr. Sharma (Uppsala University, Sweden), we examined the passage of different molecules from the periphery to the brain during methamphetamine intoxication. The substance of special interest was gp120, a neurotoxic protein that appears in circulation during AIDS. Although this protein fails to enter the brain in normal conditions, it can cross the blood-brain barrier during methamphetamine intoxication. If this mechanism will be confirmed (data is analysis), it will explain high probability of neuroAIDS and progressive neurodegeneration often developed in methamphetamine users. We also continue our studies of the central mechanisms underlying addictive properties of cocaine and its physiological effects. Particularly, we examined neuronal effects of iv cocaine with those induced by cocaine methiodide, a cocaine s derivative that fails to cross blood-brain barrier. We found that both drugs have similar excitatory effects of central neurons, implicating peripheral K+ and Na+ channels as an important substrate involved in mediating the acute stimulatory effects of iv cocaine. Our thermorecording work was supplemented by parallel electrophysiological studies, using single-unit recording with iontophoresis in awake rats. This approach appears to be an important tool for the study of central mechanisms of action of various drugs of abuse and drug-taking behavior. It provides novel information to examine the role of environmental factors in adverse health effects of addictive drug use.

Agency
National Institute of Health (NIH)
Institute
National Institute on Drug Abuse (NIDA)
Type
Intramural Research (Z01)
Project #
1Z01DA000445-08
Application #
7733799
Study Section
Project Start
Project End
Budget Start
Budget End
Support Year
8
Fiscal Year
2008
Total Cost
$1,095,822
Indirect Cost
Name
National Institute on Drug Abuse
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Solis Jr, Ernesto; Cameron-Burr, Keaton T; Shaham, Yavin et al. (2017) Intravenous Heroin Induces Rapid Brain Hypoxia and Hyperglycemia that Precede Brain Metabolic Response. eNeuro 4:
Kiyatkin, Eugene A; Ren, Suelynn E (2017) MDMA, Methylone, and MDPV: Drug-Induced Brain Hyperthermia and Its Modulation by Activity State and Environment. Curr Top Behav Neurosci 32:183-207
Wakabayashi, Ken T; Spekterman, Laurence; Kiyatkin, Eugene A (2016) Experience-dependent escalation of glucose drinking and the development of glucose preference over fructose - association with glucose entry into the brain. Eur J Neurosci 43:1422-30
Edelman, E Jennifer; Dinh, An T; Moore, Brent A et al. (2012) Human immunodeficiency virus testing practices among buprenorphine-prescribing physicians. J Addict Med 6:159-65
Smirnov, Michael S; Kiyatkin, Eugene A (2008) Behavioral and temperature effects of delta 9-tetrahydrocannabinol in human-relevant doses in rats. Brain Res 1228:145-60
Wakazono, Y; Kiyatkin, E A (2008) Electrophysiological evaluation of the time-course of dopamine uptake inhibition induced by intravenous cocaine at a reinforcing dose. Neuroscience 151:824-35
Kiyatkin, Eugene A; Bae, David (2008) Behavioral and brain temperature responses to salient environmental stimuli and intravenous cocaine in rats: effects of diazepam. Psychopharmacology (Berl) 196:343-56
Kiyatkin, E A; Brown, P L (2007) I.v. cocaine induces rapid, transient excitation of striatal neurons via its action on peripheral neural elements: single-cell, iontophoretic study in awake and anesthetized rats. Neuroscience 148:978-95
Kiyatkin, Eugene A (2007) Physiological and pathological brain hyperthermia. Prog Brain Res 162:219-43
Kiyatkin, Eugene A (2007) Brain temperature fluctuations during physiological and pathological conditions. Eur J Appl Physiol 101:3-17

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