title: Differential expression of toll-like receptor mRNA in selected tissues of goat (Capra hircus).
abstract: Pattern recognition receptors (PRRs) expressed by various immune cells and tissues have been shown to play a pivotal role in the recognition of pathogens by the host. The present study was carried out to identify toll-like receptors (TLRs) 1-10 mRNA in goat peripheral blood mononuclear cells (PBMCs) and selected tissues including jejunum, lung, lymph node, skin, spleen and uterus using reverse transcriptase polymerase chain reaction (RT-PCR). Our results confirm earlier reports regarding the evolutionarily conserved nature of these receptors as successful amplification of the goat TLR mRNAs could be obtained with bovine TLR mRNA-specific primers. The partial sequences of the purified TLR PCR amplicons had 93.8-99.7% nucleotide identity with sheep TLR cDNA sequences available in the GenBank. Semi-quantification of the expression levels of the TLR mRNAs was done using densitometric analysis of band intensities. All the TLR mRNAs (1-10) were expressed in high amounts in the lymph node while spleen showed lower expression of TLR 6 and 10 mRNAs. PBMC and lung expressed all TLR mRNAs in high amounts except TLR 10 mRNA. In uterus and jejunum, lower expression of TLR 3, 4 and 10 mRNAs was seen. Skin had the lowest repertoire of TLR mRNA expression with lower or no expression of TLR 2, 3, 4, 8, 9 and 10 mRNAs. Another interesting observation was that tissues such as uterus, lung and skin that exhibited lower levels of TLR 2 had higher levels of TLR 6 mRNAs.
authors.affiliation: Department of Animal Biotechnology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai 600007, India.
authors.forename: K G
authors.initials: KG
authors.lastname: Tirumurugaan
authors.forename: S
authors.initials: S
authors.lastname: Dhanasekaran
authors.forename: G Dhinakar
authors.initials: GD
authors.lastname: Raj
authors.forename: A
authors.initials: A
authors.lastname: Raja
authors.forename: K
authors.initials: K
authors.lastname: Kumanan
authors.forename: V
authors.initials: V
authors.lastname: Ramaswamy
mesh_terms: D000818:Animals; D001483:Base Sequence; D002417:Cattle; D017931:DNA Primers / Q000235:genetics; D005260:Female; D015870:Gene Expression; D020869:Gene Expression Profiling; D006041:Goats / Q000235:genetics* / Q000276:immunology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D014018:Tissue Distribution; D051193:Toll-Like Receptors / Q000145:classification / Q000235:genetics*
chemical_list: D017931:DNA Primers; D012333:RNA, Messenger; D051193:Toll-Like Receptors