title: Use of surface enhanced laser desorption/ionization-time of flight mass spectrometry (SELDI-TOF MS) to study protein expression in a rat model of cocaine withdrawal.
abstract: Surface enhanced laser desorption/ionization-time of flight mass spectrometry (SELDI-TOF MS) is an analytical technology for proteomic analysis that combines chromatography and mass spectrometry. At present, this technology is most commonly being exploited for the simultaneous measurement of numerous proteins in serum, but has also been utilized in organ tissue, although rarely in the brain. We applied SELDI-TOF MS technology to study protein expression in the brain of rats withdrawn from repeated cocaine exposure. Our goals were to optimize sample preparation and ProteinChip Array protocols for brain tissue, to verify the reproducibility of SELDI-TOF mass spectra and to determine whether SELDI-TOF MS detects differentially expressed proteins in cocaine- versus saline-treated rats. Consequently, we have developed an optimal protocol and generated a reproducible spectral pattern with six dominant peaks in all test samples. We have detected two smaller peaks (m/z: 5179, 5030) that were significantly increased (p < 0.05) in cocaine-treated rats compared to saline-treated rats. In summary, the application of SELDI-TOF MS to the study of protein expression in a rat model of cocaine withdrawal is feasible and has the potential to generate new hypotheses.
authors.affiliation: Center for Addiction Research, Department of Pharmacology and Toxicology, University of Texas Medical Branch, 301 University Blvd., Galveston, TX 77555-1031, United States.
authors.forename: Tao
authors.initials: T
authors.lastname: Geng
authors.forename: Patricia K
authors.initials: PK
authors.lastname: Seitz
authors.forename: Mary L
authors.initials: ML
authors.lastname: Thomas
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
authors.forename: Kizhake V
authors.initials: KV
authors.lastname: Soman
authors.forename: Alexander
authors.initials: A
authors.lastname: Kurosky
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Luxon
authors.forename: Kathryn A
authors.initials: KA
authors.lastname: Cunningham
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D003042:Cocaine / Q000009:adverse effects*; D004195:Disease Models, Animal; D008297:Male; D040081:Protein Array Analysis / Q000379:methods; D011506:Proteins / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D013375:Substance Withdrawal Syndrome / Q000209:etiology* / Q000378:metabolism*; D017557:Ventral Tegmental Area / Q000187:drug effects / Q000378:metabolism
chemical_list: D011506:Proteins; D003042:Cocaine