Hemodynamic and metabolic changes induced by cocaine in anesthetized rat observed with multimodal functional MRI
Authors
Schmidt, Karl F.Febo, Marcelo
Shen, Qiang
Luo, Feng
Sicard, Kenneth M.
Ferris, Craig F.
Stein, Elliot A.
Duong, Timothy Q.
Student Authors
Karl SchmidtUMass Chan Affiliations
Department of Psychiatry, Center for Comparative NeuroimagingDocument Type
Journal ArticlePublication Date
2006-03-22Keywords
Algorithms; Anesthesia; Animals; Blood Volume; Brain Chemistry; Cerebrovascular Circulation; Cocaine; Data Interpretation, Statistical; Hemodynamics; Hypercapnia; Injections, Intravenous; Magnetic Resonance Imaging; Male; Metabolism; Oxygen; Rats; Rats, Sprague-Dawley; RewardLife Sciences
Medicine and Health Sciences
Neuroscience and Neurobiology
Metadata
Show full item recordAbstract
RATIONALE: Physiological changes (such as heart rate and respiration rate) associated with strong pharmacological stimuli could change the blood-oxygenation-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) mapping signals, independent of neural activity. OBJECTIVES: This study investigates whether the physiological changes per se associated with systemic cocaine administration (1 mg/kg) contaminate the BOLD fMRI signals by measuring BOLD and cerebral blood flow (CBF) fMRI and estimating the cerebral metabolic rate of oxygen (CMRO(2)) changes. MATERIALS AND METHODS: BOLD and CBF fMRI was performed, and changes in CMRO(2) were estimated using the BOLD biophysical model. RESULTS: After systemic cocaine administration, blood pressure, heart rate, and respiration rate increased, fMRI signals remained elevated after physiological parameters had returned to baseline. Cocaine induced changes in the BOLD signal within regions of the reward pathway that were heterogeneous and ranged from -1.2 to 5.4%, and negative changes in BOLD were observed along the cortical surface. Changes in CBF and estimated CMRO(2) were heterogeneous and positive throughout the brain, ranging from 14 to 150% and 10 to 55%, respectively. CONCLUSIONS: This study demonstrates a valuable tool to investigate the physiological and biophysical basis of drug action on the central nervous system, offering the means to distinguish the physiological from neural sources of the BOLD fMRI signal.Source
Psychopharmacology (Berl). 2006 May;185(4):479-86. Epub 2006 Mar 21. Link to article on publisher's siteDOI
10.1007/s00213-006-0319-1Permanent Link to this Item
http://hdl.handle.net/20.500.14038/32509PubMed ID
16550388Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1007/s00213-006-0319-1