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RT-PCR was performed using the CFX96 real-time PCR system (Bio-Rad Laboratories, Hercules, CA) using SYBR Premix Ex Taq (Takara, Kyoto, Japan). Human RPL2720 and mouse ��2m mRNA were used as housekeeping genes, and quantification was determined by using the ����CT method. Specific PCR primer pairs for each studied gene are shown in Table?1. Human monocytes were separated from the peripheral blood of healthy volunteers as described previously.21 The purity and viability of the monocytes was confirmed to be >98% by staining with Diff-Quik (Baxter Diagnostics, Deerfield, IL) and trypan blue, respectively. Mouse alveolar macrophages (AMs) were collected by using bronchoalveolar lavage as described previously.9 More than 95% of the cells were confirmed to be AMs. For eliciting mouse peritoneal macrophages (PMs), 2 mL of thioglycollate (BD Biosciences, San Jose, CA) was injected into the peritoneal [http://www.selleckchem.com/products/isrib-trans-isomer.html selleckchem] cavity of SCID mice. After 3 days, peritoneal exudative cells were harvested by intraperitoneal lavage with ice-cold PBS. Approximately 80% of isolated cells were macrophages. NK cells from SCID mice were isolated as previously described.22 [http://www.selleckchem.com/screening/inhibitor-library.html Inhibitor Library chemical structure] These immune cells were stimulated with 20 ��g/mL of human SP-A for 4 hours in RPMI 1640 medium containing 1% fetal bovine serum. Total RNA was extracted for quantitative RT-PCR. The migration assay was performed using 8-��m pore size cell culture inserts (BD Biosciences). After 24 hours of serum starvation, PMs in serum-free media were added to the inner chamber in the presence or absence of 20 ��g/mL of SP-A. RPMI 1640 medium containing 10% fetal bovine serum was added to the lower chamber. After 17 hours of incubation, the cells that had migrated to the bottom surface of the filter were counted in six randomly selected fields on each filter under a microscope at ��200 magnification. Twenty micrograms of total protein extracted from tumor cell lines was resolved by SDS-PAGE (Invitrogen) and was transferred to polyvinylidene difluoride membrane (Atto Corp., Tokyo, Japan), and Western blot was performed as described previously.9 Immunoreactive bands were visualized using SuperSignal west femto maximum sensitivity substrate (Thermo Scientific, Waltham, MA). Data are given as means �� SEM. Statistical analysis was performed using the Student��s t-test of unpaired samples or the U-test. [http://en.wikipedia.org/wiki/Coagulation Tasisulam] Values of P