Abstract：
:We have cloned a homologue of the translationally controlled tumor protein (TCTP) from the buccal gland of Lampetra japonica according to information from a cDNA library and primary analysis of expressed sequence tags. Sequence analysis of L. japonica TCTP showed that it had two signature regions of high sequence homology termed TCTP-1 and TCTP-2, respectively. TCTP is highly conserved in evolution. It showed more than 40% identification similarities with parasite TCTPs that had effect on immune responses of host. Phylogeny of 31 TCTP sequences showed that lamprey was closer to jawed vertebrates than to Amphioxus and was a sister group of gnathostomes. TCTP gene from L. japonica was expressed in a pET23b vector and purified by using His Bind affinity chromatography. Polyclonal antibody to recombinant protein was generated in New Zealand Rabbit. Immunoblot analysis to localize the recombinant protein in buccal gland secretion proves that recombinant TCTP is a secretion protein, which may be secreted through a non-classical secretion pathway. A characterization study shows that recombinant TCTP has histamine-releasing function in vitro. It mediated histamine release from rat basophilic leukemia (RBL-2H3) cells. TCTP links both the innate and the adaptive immune responses by modulating the secretion of cytokines from mast cells, basophils, eosinophils, and T and B lymphocytes. These may indicate a potential role of TCTP in the inflammatory process and immune regulation between L. japonica and host.
journal_name
Biochimiejournal_title
Biochimieauthors
Sun J,Wu Y,Wang J,Ma F,Liu X,Li Qdoi
10.1016/j.biochi.2008.08.002subject
Has Abstractpub_date
2008-11-01 00:00:00pages
1760-8issue
11-12eissn
0300-9084issn
1638-6183pii
S0300-9084(08)00252-6journal_volume
90pub_type
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