title: Effect of acute heat shock on gene expression by human peripheral blood mononuclear cells.
abstract: We studied the effect of heat shock on gene expression by normal human cells. Peripheral blood mononuclear cells (PBMCs) were obtained from healthy adults. Paired samples from each subject were subjected to either 20 min of heat shock (43 degrees C) or control (37 degrees C) conditions and then returned to 37 degrees C. RNA was isolated 160 min later, and five representative samples were analyzed on Affymetrix gene chip arrays containing approximately 12,600 probes. A biologically meaningful effect was defined as a statistically significant, twofold or greater difference in expression of sequences that were detected in all five experiments under control (downregulated sequences) or heat shock (upregulated sequences) conditions. Changes occurred in 395 sequences (227 increased by heat shock, 168 decreased), representing 353 Unigene numbers, in every functional category previously implicated in the heat shock response. By RT-PCR, we confirmed the findings for one upregulated sequence (Rad, a G protein) and one downregulated sequence (osteopontin, a cytokine). We conclude that heat shock causes extensive gene expression changes in PBMCs, affecting all functional categories of the heat shock response.
authors.affiliation: Thermal and Mountain Medicine Division, US Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA. larry.sonna@na.amedd.army.mil
authors.forename: Larry A
authors.initials: LA
authors.lastname: Sonna
authors.forename: Stephen L
authors.initials: SL
authors.lastname: Gaffin
authors.forename: Richard E
authors.initials: RE
authors.lastname: Pratt
authors.forename: Michael L
authors.initials: ML
authors.lastname: Cullivan
authors.forename: Karen C
authors.initials: KC
authors.lastname: Angel
authors.forename: Craig M
authors.initials: CM
authors.lastname: Lilly
mesh_terms: D000328:Adult; D018833:Chaperonins / Q000235:genetics / Q000378:metabolism; D015536:Down-Regulation; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D020869:Gene Expression Profiling; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism; D018869:Heat-Shock Response / Q000235:genetics / Q000502:physiology*; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis; D053495:Osteopontin; D012333:RNA, Messenger / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012795:Sialoglycoproteins / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation; D018631:ras Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D012333:RNA, Messenger; C084355:RRAD protein, human; C506895:SPP1 protein, human; D012795:Sialoglycoproteins; D053495:Osteopontin; D018833:Chaperonins; D018631:ras Proteins