title: Correlation of protein and gene expression profiles of inflammatory proteins after endotoxin challenge in human subjects.
abstract: Administration of endotoxin (LPS) in humans results in profound physiological responses, including activation of peripheral blood mononuclear cells and the release of inflammatory factors. The time course of the response of selected inflammatory proteins was examined in healthy subjects (n = 6) administered a single intravenous dose of the purified derivative of endotoxin (3.0 ng/kg). Microarray analysis demonstrated changes in the expression of a number of genes, which were confirmed in separate in vitro endotoxin stimulation experiments. Subsequent TaqMan analysis of genes of interest indicated time-dependent changes in the expression of many of these genes. This included pre-B cell enhancing factor, which was identified on microarray analysis as being markedly upregulated following endotoxin stimulation. Protein expression of the genes examined by TaqMan analysis was measured and demonstrated the appearance of tumor necrosis factor (TNF)-alpha and sTNF-R proteins in the plasma beginning within 1 h after dosing, followed by other cytokines/ inflammatory markers (e.g., IL-1ra, G-CSF, IL-6, IL-8, and IL-10) and suppressors of cytokine signaling (SOCS-1 and SOCS-3). In general, cytokine protein expression correlated well with gene expression; however, the temporal profile of expression of some genes did not correlate well with the protein data. For many of these proteins, the lack of correlation was attributable to alternate tissue sources, which were demonstrated on TaqMan analysis. Principal component analysis indicated that cytokines could be grouped according to their temporal pattern of response, with most transcript levels returning to baseline 24 h following endotoxin administration. The combination of cDNA microarray and TaqMan analysis to identify and quantify changes in gene expression, along with the analysis of protein expression, can be useful in investigating inflammatory and other diseases.
authors: Department of Clinical Pharmacology, Centocor Inc., Horsham, PA 19044, USA. prabhakaru@centocor.com
authors: Uma
authors: U
authors: Prabhakar
authors: Theresa M
authors: TM
authors: Conway
authors: Paul
authors: P
authors: Murdock
authors: Jeff L
authors: JL
authors: Mooney
authors: Steve
authors: S
authors: Clark
authors: Priti
authors: P
authors: Hedge
authors: Brian C
authors: BC
authors: Bond
authors: Elizabeth C
authors: EC
authors: Jazwinska
authors: Michael R
authors: MR
authors: Barnes
authors: Frank
authors: F
authors: Tobin
authors: Valeriu
authors: V
authors: Damian-Iordachi
authors: Larry
authors: L
authors: Greller
authors: Mark
authors: M
authors: Hurle
authors: Andrew P
authors: AP
authors: Stubbs
authors: Zhong
authors: Z
authors: Li
authors: Elizabeth I
authors: EI
authors: Valoret
authors: Connie
authors: C
authors: Erickson-Miller
authors: Lisa
authors: L
authors: Cass
authors: Blanche
authors: B
authors: Levitt
authors: Hugh M
authors: HM
authors: Davis
authors: Diane K
authors: DK
authors: Jorkasky
authors: William V
authors: WV
authors: Williams
mesh_terms: D000293:Adolescent; D000328:Adult; D016207:Cytokines / Q000378:metabolism*; D004731:Endotoxins / Q000008:administration & dosage* / Q000494:pharmacology; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects*; D016179:Granulocyte Colony-Stimulating Factor / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000473:pathology; D007275:Injections, Intravenous; D007375:Interleukin-1 / Q000378:metabolism; D016753:Interleukin-10 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism; D007700:Kinetics; D008297:Male; D046228:Microarray Analysis; D054409:Nicotinamide Phosphoribosyltransferase; D016133:Polymerase Chain Reaction; D011506:Proteins / Q000032:analysis* / Q000378:metabolism; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D016207:Cytokines; D004731:Endotoxins; D007375:Interleukin-1; D015850:Interleukin-6; D016209:Interleukin-8; D011506:Proteins; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D016179:Granulocyte Colony-Stimulating Factor; D054409:Nicotinamide Phosphoribosyltransferase; C085455:nicotinamide phosphoribosyltransferase, human