Induction of calprotectin mRNAs by lipopolysaccharide in the salivary gland of mice.
Calprotectin is a major cytosolic calcium-binding protein of leukocytes which belongs to the S100 protein family. S100A8 and S100A9, major types of calprotectin are heterodimeric complexes being composed of light- and heavy-chain subunits. The calprotectin levels in the plasma, feces, synovial fluid, gingival crevicular fluid, dental calculus and saliva change when the host animal suffers from several inflammatory diseases. Members of Toll-like receptor (TLR) family are pattern-recognition receptors for lipopolysaccharide (LPS) and other pathogens. Here we examined if the biological role of TLR receptor is reflected to the calprotectin expression in the salivary gland. Time course study by using real-time RT-PCR detected higher levels of S100A8 and S100A9 mRNA at 1.5-3 h after injection of LPS in both the submandibular gland (SMG) and parotid gland (PG) of C3H/HeN mice but not in the same tissues of C3H/HeJ, a TLR-4 mutant strain, indicating that this induction is mediated via the TLR-4. These results indicate that, an inflammatory marker, calprotectin, is expressed in the mouse salivary gland and that LPS stimulated its synthesis. Calprotectin (S100A8/A9) showed minimum expression in all cellular segments in the SMG except excretory duct cells, which showed strong signal at the cytoplasm. LPS induced their expressions in the granular convoluted tubular cells and striated duct cells. In the PG, these proteins were expressed very weakly in both duct and acinar cells with a little stronger staining for the former cells. LPS injection induced calprotectin (S100A8/A9) in both duct and acinar cells especially in the former cells.
Department of Molecular Oral Physiology, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima, Japan.
Purevjav
P
Javkhlan
Yuka
Y
Hiroshima
Ahmad
A
Azlina
Takahiro
T
Hasegawa
Chenjuan
C
Yao
Tetsuya
T
Akamatsu
Jun-ichi
J
Kido
Toshihiko
T
Nagata
Kazuo
K
Hosoi
D000818:Animals; D040501:Calgranulin A / Q000235:genetics / Q000378:metabolism; D040502:Calgranulin B / Q000235:genetics / Q000378:metabolism; D039841:Leukocyte L1 Antigen Complex / Q000235:genetics / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D051379:Mice; D008809:Mice, Inbred C3H; D008817:Mice, Mutant Strains; D010306:Parotid Gland / Q000187:drug effects / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D012469:Salivary Glands / Q000187:drug effects* / Q000378:metabolism*; D013363:Submandibular Gland / Q000187:drug effects / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000235:genetics / Q000378:metabolism
D040501:Calgranulin A; D040502:Calgranulin B; D039841:Leukocyte L1 Antigen Complex; D008070:Lipopolysaccharides; D012333:RNA, Messenger; C493487:Tlr4 protein, mouse; D051197:Toll-Like Receptor 4