Conclusion In order to detect the changes in M. loti between GS-4997 in vitro free-living and symbiotic conditions, we performed proteome analysis of M. loti. We used our LC-MS/MS system, equipped with a long monolithic silica capillary column, to successfully identify 1,658 proteins without bacteroid isolation and prefractionation. This analytical system opens up a new horizon

for symbiotic proteome analysis from small amounts of unpurified crude biological samples. The protein profile indicated some interesting and unexpected results associated with the cell surface structure and metabolism, in accordance with the external environment of each condition (Figure 5). The data set revealed that M. loti under the symbiotic condition simplifies the components of the cell surface, such as flagellum, pilus, and cell wall. In addition, we found that M. loti under the symbiotic condition provided not only a nitrogen source but also FPP, which is a source of secondary metabolism. Our data should be helpful in carrying out

detailed studies on the change of these 2 conditions Apoptosis inhibitor of rhizobia. Figure 5 Schematic representation of the lifestyle under the symbiotic condition compared to the free-living condition. The illustration shows the changes in the lifestyles of M. loti: the lifestyle model under the (a) free-living and (b) symbiotic conditions. The central carbon metabolic pathway is essential under both conditions. Under the symbiotic condition, nitrogen is fixed by electrons from the TCA cycle or other energy metabolism and is provided to the host Trichostatin A mouse legume or used for amino acid biosynthesis. Moreover, the flagellum and pilus are lost, and the cell wall, which is mainly composed of peptidoglycan, may become thin or disappear. In contrast, FPP is synthesized to provide to the host legume. Under the free-living condition, LPS is secreted extracellularly as a nod factor to infect the host legume. Methods Strains and growth conditions M. loti MAFF303099 was cultured

in tryptone-yeast extract (TY) Branched chain aminotransferase medium [35] at 28°C. Cells were harvested in the early stationary phase for 72 h. Cells were subjected to sample preparation in the free-living condition. For the symbiotic condition, L. japonicus MG-20 Miyakojima [36] seeds were sterilized, germinated, and inoculated with M. loti and grown in MM1 [37] medium at 25°C with a 16-h light/8-h dark cycle. Root nodules from several plants were harvested at 7 weeks post-inoculation. Nodules from 3 independently grown pools of plants were collected and processed in parallel. Nodules were frozen with liquid nitrogen, homogenized with an ice-cold mortar, and subjected to sample preparation. Sample preparation Collected cells were resuspended with 500 μL of lysis buffer (2% (w/v) 3-(3-cholamidopropyl)dimethylammonio-1-propanesulfonate, 10 mM dithiothreitol, 1% (v/v) protease inhibitor cocktail (Sigma-Aldrich, St.

5%) and pH tolerance. Further taxonomic classification of BGKP1 involved repPCR with (GTG)5 primer [34], and sequencing of amplified 16S rDNA [35]. A non-aggregating derivative BGKP1-20 (Agg-), L. lactis subsp. lactis BGMN1-596 (9), L. lactis subsp. cremoris MG1363 [36] and Enterococcus faecalis BGZLS10-27 [37] were used for homologous and heterologous expression of the aggregation phenotype. Lactococcal and enterococcal strains were grown at 30°C in M17 medium Rabusertib ic50 [38] supplemented with 0.5% glucose (GM17) and stored in the same medium containing 15% (w/v) glycerol (Sigma Chemie GmbH, Deisenhofen, see more Germany) at -80°C. L. lactis

and E. faecalis electrocompetent cells were prepared and transformed as previously described [39] using an Eppendorf Electroporator (Eppendorf, Hamburg, Germany). E. coli strain DH5α [40] was used for cloning experiments and plasmid propagation. DH5α was grown at 37°C in Luria-Bertani (LB) medium [41]. Agar plates were prepared by addition of agar (1.5% w/v) to the corresponding broth. E. coli competent cells were prepared using chemical treatment and subjected to heat shock transformation. Transformants were selected using the antibiotic erythromycin (5 μg ml-1 for lactococci and enterococci or 250 μg ml-1 for E. coli). Bacteriocin and proteinase activity were determined as described

previously [9]. Growth kinetics Cultures of BGKP1 and BGKP1-20 were grown in 10 ml of GM17 to a density of 109 cells ml-1. Approximately 106 cells of each strain were added to 10 ml of GM17 SRT2104 and cultures were incubated at 30°C. Aliquots from each culture were taken every hour and plated on solid GM17 medium to calculate generation time for each strain. Experiments were done in triplicate. Molecular techniques Molecular cloning techniques like end filling of DNA fragments with the Klenow fragment of DNA polymerase, dephosphorylation, ligation, PCR amplification and agarose gel DNA electrophoresis were carried out essentially as described

previously [41]. The mini-prep method [42] nearly was used for isolation of large plasmids from lactococci. Plasmids from E. coli were isolated using the QIAprep Spin Miniprep kit according to the manufacturer’s recommendations (QIAGEN, Hilden, Germany). The DNA fragments from agarose gels were purified using a QIAqick Gel extraction kit as described by the manufacturer (QIAGEN). Digestion with restriction enzymes was conducted according to the supplier’s instructions (Fermentas, Vilnius, Lithuania). Determination of the effect of ions, pH and proteinase K on aggregation ability of L. lactis subsp. lactis BGKP1 The effect of different ions and pH values on the BGKP1 aggregation phenotype was tested using cells that were three times washed in bi-distilled water until the aggregation phenotype was lost.

Table 1 Primers for amplifying epitopes of OmpL1 and LipL41 Protein Location Primer Sequence(5′-3′) OmpL1 59-78 O1-F59 cg GGTACC TTTCTATTCTCACTCTgttcgatcgtccaatacctg     O1-R59 tt CGGCCG a gccgcc tgggttttgaaaacaagcag   87-98 O1-F87 cg GGTACC TTTCTATTCTCACTCTtatataggagttgctcctag     O1-R87 ttCGGCCGa gccgcc agcaggaatcgcttttctag   173-191 O1-F173 cg GGTACC TTTCTATTCTCACTCTagttctatcgtcattcctgc     O1-R173 tt CGGCCG a gccgcc agcgtcttcagtaacattc   297-320 O1-F297 cg GGTACC TTTCTATTCTCACTCTctttctccttttccagc     O1-R297 tt CGGCCG a gccgcc gagttcgtgtttataaccg LipL41 30-48 L41-F30 cg GGTACC TTTCTATTCTCACTCTgtattcccgaaagataaaga

ATM Kinase Inhibitor     L41-R30 tt CGGCCG a gccgcc acgaatggttccgaggaat   181-195 L41-F181 cg GGTACC TTTCTATTCTCACTCTgtacgtatgatgttaattc     L41-R181 tt CGGCCG a gccgcc tactttaatgagagtagc   233-256 L41-F233 cg GGTACC TTTCTATTCTCACTCTgaagctgcttatatc     L41-R233 tt CGGCCG a gccgcc tttaacgaaaactttaattc

  263-282 L41-F263 cg GGTACC TTTCTATTCTCACTCTaaagaacttcttcaagaaggtt     L41-R263 tt CGGCCG a gccgcc ttttttgaaacttggagtttc Eco R52 I and Kpn I sites are capital and underlined. Sequence encoding M13KE leader peptide is capitalized. The sequences in bold encode flexible peptide. The proliferation and purification of phage was reported previously [22]. E. coli ER2738 was inoculated in 30 mL LB culture medium and incubated with shaking at 37°C for 2 h. Each recombinant phage was used to infect ER2738, and the culture was incubated with vigorous aeration at 28°C for 4 h. After centrifugation at 10 000 rpm for 10 min at 4°C, the medium supernatant containing phage was transferred to a clean tube and mixed with 1/6 volume Capmatinib molecular weight of 20% polyethylene glycol 8000 (PEG 8000)-2.5 M NaCl and incubated at 4°C overnight. The

phage was pelleted by centrifugation at 11 000 rpm for 15 min at 4°C and resuspended in 1 ml TBS (50 mM Tris-HCl, pH 7.5, 150 mM NaCl). The phage was reprecipitated by adding 1/6 volume of 20% PEG 8000-2.5 M NaCl and incubation on ice for 1 h. Finally, the recombinant phage was collected by centrifugation at 11 000 rpm for 15 min at 4°C and resuspended in TBS. The OD values at wavelength 269 and 320 were determined and used to calculate the number of phage particles according to the method of Day described previously [23]. Identification of B cell epitopes GDC941 Western blot Carnitine palmitoyltransferase II assay was used to detect the reactivity of B cell epitope with antibodies in the rabbit sera raised against L. interrogans, rOmpL1 or rLipL41. Purified recombinant phage particles (3 × 1014) were separated by electrophoresis in an 8% SDS-PAGE gel and then transferred to a polyvinylidene fluoride membrane (PVDF, Millipore). The membrane was blocked in 6% newborn bovine serum-TBST (Tris buffered saline; 0.1% Tween 20, pH 7.2) for 1 h and incubated overnight at 4°C with rabbit serum against leptospira Lai (dilution 1:200, MAT more than 1:400) followed by blotting with HRP-conjugated goat anti-rabbit antibodies (dilution 1:5000) for about 1 h at 37°C.

Vertical black lines indicate cos and attP sites respectively. Red arrows indicate tRNA genes. Pseudogenes are marked with GSK872 a black asterisk. Below the scale, arrows represent homologous proteins of bacteriophages and prophages from

different hosts with S. flexneri, E. coli and Salmonella framed within a green, red or blue box, respectively. Homologs between SfI and other phages/prophages are shown in different colors with color coding corresponding to level of homology at amino acid level, with red of 100% identity and blue of > =50% identity. Phage SfI has a very narrow host range Host specificity of serotype-converting bacteriophages has long been recognized, which results in the specific lytic spectrum and serotype conversion of S. flexneri in nature [20]. The recognition between the O-antigen of host bacterium and the tail component of a phage is the key Torin 1 mouse mechanism of host specificity [20]. To determine the host range of SfI, 132 S. flexneri CYC202 strains of 12 serotypes (1a, 1b, 2a, 2b, 3a, 3b, 4a,

4b, 5a, Y, X and Xv) were tested following the methods described in the Methods. Apart from 10 serotype Y strains, which were all converted to serotype 1a as expected, the 24 serotype X strains tested were also lysogenized, and converted to a newly named serotype 1d [16]. The serotype 1d strains were serologically characterized as reacting with both serotype 1 specific I typing sera and serotype X specific 7;8 grouping sera [16]. Interestingly, such a serotype has already appeared in natural infections in Anhui and Henan provinces, China [21]. Except for serotypes Y and X, the other serotypes could not be lysogenized by phage SfI. A possible explanation for the host range restriction of phage SfI is phage immunity due to modification of the O-antigen as phage receptors [22]. SfI uses a site-specific mechanism for DNA packaging and has the same attP core sequence as SfII, SfIV, SfV and SfX Restriction enzyme analysis revealed that phage SfI has a linear but not circular Paclitaxel ic50 genome (data not shown). Genomic comparison found that the

SfI prophage genome has similar packaging genes to that of phage SfV; and the fragments adjacent to them were also highly similar to the cohesive end site (cos) of phage SfV [9], with only one base difference at the 5′ end (T versus A). These data suggest that SfI may use the same site-specific mechanism as SfV for packaging. Direct sequencing of the putative termini of the SfI genome extracted from free phage particles and comparison of the corresponding regions with the SfI prophage genome in strain 019 revealed a 10 nucleotide (5′- TGCCCGCCCC -3′) gap in the SfI phage genome. Therefore, we conclude that SfI uses a cos mechanism for DNA packaging as postulated for phage SfV [9], and does not use a head full mechanism (pac) as for phage Sf6 and SfX [10, 12].

plantarum MYL26 to see which cellular parts contributed mostly to LPS tolerance induction. In contrast with our expectations, although intracellular extract and genomic DNA induced IκBα expression more significantly than that of control group, they failed to activate TOLLIP, SOCS1, and SOCS3. There are five TLRs (TLR2/ 4/ 5/ 7/ 9) sharing similar

downstream signal pathway (MyD88, IRAK, TRAF, IKK, NFκb) [38]. Except for IκBα which check details directly binds to NFκb, the negative Selumetinib ic50 regulators TOLLIP, SOCS1, and SOCS3 are well-established having abilities in interference with recruitment of MyD88 and IRAK. It has been reported that TOLLIP, SOCS1, and SOCS3 not only attenuate TLR4 signaling, selleck products but also have impact on TLR2/5/7/9

signaling [39, 40]. Briefly, L. plantarum MYL26 intracellular extract and genomic DNA activate TLRs-NFκb pathways other than TLR4 (TLRs cross-tolerance), but they did not attenuate inflammation through induction of TOLLIP, SOCS1, and SOCS3. Taken together, we proposed that L. plantarum MYL26 intracellular extract and genomic DNA induced LPS tolerance through pathways different from induction of Tollip, SOCS-1 and SOCS-3, which were key negative regulators activated by live/dead L. plantarum MYL26 and cell wall components. One of the limitations of this study is that the causes of IBD, other than breakdown of LPS tolerance, are multifaceted. Several lines of evidence has pointed out that ID-8 in addition to inherited factors, pollution, drugs, diets, breastfeeding, even emotional stress, could be responsible for genetically failing to interpret molecular microbial patterns appropriately, thus leading to

irregular innate and adaptive immune responses [41, 42]. The second limitation is that PAMPs other than LPS induce GI inflammation through different pathways. Criteria for probiotic selection of LPS tolerance induction strains might be not suitable with respect to inflammation symptoms caused by other PAMPs. Conclusions The administration of lactic acid bacteria in patients suffering from GI disorders regularly depends on try-error methods, and numerous probiotics treatment applied to clinical trials showed frustrated results, which perhaps might be related to the fact that the probiotic screening criteria is generally based on susceptibility to artificial GI environments (acid and bile resistance) or adhesive properties instead of on immunomodulatory capacities, for instance, induction of LPS tolerance. Our research provided a new insight to describe the L.

GJ and MZ was closely involved in research design and drafting of the final manuscript. All authors read and approved the final manuscript.”
“Background The epidermal growth factor receptor (EGFR) is frequently over-expressed in non-small-cell lung cancer (NSCLC) Vorinostat solubility dmso (32–81%) and is taken as a promising target for NSCLC treatment [1, 2]. The representative drugs, such as Gefitinib and Erlotinib, exhibit superior clinical efficacy compared to best supportive care or standard chemotherapy [3, 4]. Prior studies have indicated presence of EGFR mutation is a robust predictor of increasing sensitivity to tyrosine kinase inhibitors (TKIs) and is associated with improved progression-free survival with TKIs [5–9]. Interestingly,

about 10%-20% of advanced NSCLC patients with wild-type EGFR also benefit from EGFR-TKIs [10–12]. This raises the question whether there are some other predictors beyond EGFR mutation that can reliably identify patients with wild-type EGFR who could benefit from TKIs therapy. EGFR is a 170 kDa tyrosine kinase receptor consisting of an extracellular ligand-binding domain, a transmembrane lipophilic domain, and an intracellular tyrosine kinase domain

and the C-terminus region with multiple tyrosine see more residues [13]. Ligand binding to EGFR results in homo- or hetero-dimerization, activation of the highly conserved intracellular kinase domain and autophosphorylation of tyrosine residues by γ-phosphate from ATP. The phosphorylated Tyr selleck products serve as docking sites of a range of proteins, whose recruitment activate downstream signaling pathways including Ras/Raf/mitogen-activated protein kinase (MAPK) pathway, extracellular signal-regulated kinase (ERK), phosphatidylinositol 3-kinase (PI3K)/Akt pathway, signal transduction and activator of transcription (STAT), and other pathways. ERK1 and ERK2 regulate cell growth and proliferation, whereas Akt and STAT specifically regulate cell survival and apoptosis [14–19]. Five autophosphorylation

sites in the EGFR have been identified, all of which are clustered at extreme carboxyl-terminal 194 amino acids. Among these sites, tyrosine (Tyr) 1068, Tyr1148, and Tyr1173 are major sites, whereas Tyr992 and Tyr1086 are minor sites [20]. Distinct downstream signaling cascades are initiated by EGFR depending on its phosphorylation pattern. Phosphorylation Megestrol Acetate at Tyr1068, can bind GAB-1 or Grb2, and subsequently activate their downstream signaling pathways [18, 21]. Phosphorylation of Tyr1173 leads to interaction with Shc and phospholipase Cγ (PLCγ), which are involved in activation of MAPK signaling pathway [22]. Numerous preclinical studies have revealed that somatic mutations of the EGFR gene constitutively enhanced EGFR tyrosine kinase activity and receptor autophosphorylation [23–25]. This suggests that regulation of receptor’s tyrosine phosphorylation is critical for modulation of the cellular effects of activated EGFR.

Lancet 1981, i:653–656.CrossRef 27. Erkasap S, Ates E, Ustuner Z, Sahin A, Yilmaz S, Yasar B, et al.: Diagnostic value of interleukin-6 and Creactive protein in acute appendicitis. Swiss Surg 2000,6(4):169–172.PubMedCrossRef 28. Wu HP, Lin CY, Chang CF, Chang YJ, Huang CY: Predictive value of C-reactive protein at different cutoff levels in acute appendicitis. Am J Emerg Med 2005,23(4):449–453.PubMedCrossRef 29. Gronroos JM, Gronroos P: Leukocyte count and Creactive protein in the diagnosis of acute appendicitis. Br J Surg 1999,86(4):501–504.PubMedCrossRef 30. Eryilmaz R, Sahin M, Alimoglu O: The value of C-reactive

protein and leukocyte count in preventing negative appendectomies. Ulus Treuma Derg 2001, 713:142–145. 31. Grönroos JMJU: find more Do normal leukocyte count and C-reactive protein value exclude acute in children? Acta Paediatr 2001,90(6):649–5.PubMedCrossRef 32. Yokoyama S, Takifuji Tozasertib solubility dmso K, Hota T, Matsuda K, Nasu T, Nakamori M, Hirabayashi N, Kinoshita H, Yamaue H: C-Reactive protein is an independent surgical indication marker for appendicitis: a retrospective study. World J of Emergency EPZ015938 Surgery 2009, 4:36.CrossRef 33. Sinanan M, et al.: Acute Abdomen and Appendix. In Surgery; Scientific Principles and Practice. 4th edition. Edited by: Greenfield L. Philadelphia: J.B. Lippincot Company; 2005:1120–1142. 34. Eriksson S, Granstrom

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I, Granstrom L: Appendectomy versus antibiotic treatment in acute appendicitis; a prospective multicenter randomized medroxyprogesterone trial. World J Surg 2006, 30:133–137.CrossRef 36. Exadactylos A, Sadowski-Cron C, Mader P, Weissmann M, Dinkel HP, Negri M, Zimmerman H: Decision making in patients with acute abdominal pain at a university and at a rural hospital: does the value of abdominal sonography differ? World Journal of Emergency Surgery 2008, 3:29.CrossRef 37. Leaper DJ, Horrocks JC, Staniland JR, De Dombal FT: Computer-assisted diagnosis of abdominal pain using “estimates” provided by clinicians. Br Med J 1972, 4:350–354.PubMedCrossRef 38. Kessler N, Cyteval C, Gallix B, Lesnik A, Blayac PM, Bruel JM, Taourel P: Appendicitis: Evaluation of sensitivity, specificity, and predictive values of US, Doppler US, and laboratory findings. Radiology 2004, 2:474–478. Competing interests The authors declare that they have no competing interests. Authors’ contributions SX designed the study, carried out acquisition, analysis, interpretation of the data, and drafting of the manuscript. LG-L analyzed histologically the removed appendixes. KX measured the Serum CRP. FV, BB, and FS participated in the study’s design. AK designed the study, was involved in interpretation of the data, the drafting of the manuscript, and revised it critically for the intellectual content until the final version was reached.

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innocua strains, 5 from reference collections, 13 from meat, 8 from milk and 8 from seafoods, and 4 L. welshimeri strains. Listeria strains were retrieved from glycerol stocks maintained at -80°C, and cultured in brain heart infusion broth (BHI; Oxoid, Hampshire, England) at 37°C. YH25448 nmr Carbohydrate fermentation and hemolytic reactions The recommended biochemical patterns for differentiating Listeria spp. included L-rhamnose, D-xylose, D-mannitol and glucose utilization and hemolytic reactivity, and were tested by using

conventional procedures [36, 37]. DNA manipulations Genomic DNA was extracted using a protocol reported previously [12]. Oligonucleotide primers were synthesized by Invitrogen Biotechnology (Shanghai, China) (Table 6 and Additional file 1; table S2), and Taq DNA polymerase (TaKaRa Biotech Co. Ltd., Dalian, China) was used for PCR amplification. PCR was conducted using a PT-200 thermal cycler (MJ Research Inc. MA, Boston, USA), with annealing temperatures depending on specific primer pairs (Table 6 and Additional file 1; table S2), and the duration of extension depending on the expected length of

amplicon (1 min per kb, at 72°C). For DNA sequencing analysis, PCR fragments were purified with the AxyPrep DNA Gel Extraction Kit (Axygen Inc., USA) and their sequences determined by dideoxy method on ABI-PRISM 377 DNA sequencer. Table 6 Primers used for MLST Locus Putative function Locationa Forward primer Momelotinib chemical structure click here Reverse primer Length (bp) gyrB DNA gyrase subunit B 6,031-7,971 TGGTGCATCGGTAGTTAATGC CAACATCTGGGTTTTCCATCAT 657 dapE Succinyl diaminopimelate desuccinylase 301,402-302,538 GTAAATATTGATTCGACTAATG CACTAGCACTTGTTTCACTG 669 hisJ Histidinol phosphate phosphatase 606,408-607,235 TCCACATGGTACGCATGAT GGACATGTCAAAATGAAAGATC

714 sigB Stess responsive alternative sigma factor B 924,734-925,513 CCAAAAGTATCTCAACCTGAT CATGCATTTGTGATATATCGA 642 ribC Riboflavin kinaseand FAD synthase 1,364,536-1,365,480 AAGACGATATACTTACATCAT GTCTTTTTCTAACTGAGCA 633 purM Phosphoribosyl aminoimidazole synthase 1,893,107-1,894,153 CAAGCTCCACTTTGACAGCTAA TAAAGCAGGCGTGGACGTA 693 betL Glycine betaine transporter 2,216,882-2,218,405 ACAGAACATTATCCAAATGAGTT ACGTTGTGATTTTTTCGGTC 534 gap find more Glyceraldehyde 3-phosphate dehydrogenase 2,578,558-2,579,584 CTGGATCAGAAGCTGCTTCCA GTCGTATTCAAAATGTGGAAGGA 621 tuf Translation elongation factor 2,816,958-2,818,145 CATTTCTACTCCAGTTACTACT GCTCTAAACCCCATGTTA 681 Subtotal         5,844 a, Positions correspond to complete genome sequence of L. innocua strain CLIP11262 (AL592022). Internalin profiling By sequence comparison of L. monocytogenes strains F2365, H7858 (serovar 4b), EGDe and F6854 (serovar 1/2a) and L. innocua strain CLIP11262, we investigated the presence or absence of 14 L. monocytogenes-L. innocua-common and 4 L. innocua-specific internalin genes as well as 19 L. monocytogenes-specific internalin genes by PCR with specific primers outlined in Additional file 1; table S1.

3 mM (10.2 mg/l) H2O2 caused complete inhibition that lasted for nearly 16 h, whereas 0.3 mM (10.2 mg/l) H2O2 alone had no effect. However, if no more H2O2 was added, the concentration of the inhibitor OSCN- Nec-1s concentration fell because of slow decomposition of OSCN-, and, when OSCN- fell below 0.01 mM (0.74 mg/l), the bacteria resumed metabolism and growth. The loss of OSCN- over time is based

on decomposition, not on the reaction with bacteria [29]. The typical concentration of peroxidases in whole saliva is roughly 5 μg/ml, whereas the MPO concentration (3.6 μg/ml) is approximately twice the amount of SPO (1.9 μg/ml) [30]. Therefore, even if SPO is deficient, MPO activity would probably be adequate for SCN- oxidation in mixed saliva [30]. The study by Adolphe et al. [31] showed that the lactoperoxidase system’s antimicrobial efficiency can be enhanced by better concentration ratios of the LPO SU5402 cost system components. However, this finding was

postulated for only near physiological conditions and did not consider a concentration of thiocyanate Quisinostat datasheet and H2O2 higher than the physiological one. Rosin et al. [32] showed that, in the saliva peroxidase system, increasing SCN-/H2O2 above its physiologic saliva level reduced plaque and gingivitis significantly compared to baseline values and a placebo. A new dentifrice formulated on these results showed the same effects regarding plaque and gingivitis prevention in comparison to a benchmark product containing triclosan [33]. However, the effects were not sufficient to recommend using the SPO system to effectively prevent oral diseases in the long run. Thus, the question arose, Is it possible to increase antimicrobial effectiveness by adding not just Farnesyltransferase thiocyanate and hydrogen peroxide but also LPO to oxidize as much the SCN- anions as possible to become an effective antimicrobial agent? Therefore, we conducted a standardized quantitative suspension test at a fixed concentration level of all three components above the physiological one to evaluate the influence of LPO on the lactoperoxidase-thiocyanate-hydrogen peroxide system relative to its bactericidal and fungicidal effectiveness against Streptococcus mutans and sanguinis and Candida albicans. Results

The reduction factors (RF) of the test suspensions without and with LPO on the viability of Streptococcus mutans, Streptococcus sanguinis, and Candida albicans at different time points (1, 3, 5, and 15 min) are shown in tables 1, 2 &3. Table 1 Reduction factors of the test thiocyanate hydrogen peroxide microbial suspension without and with LPO to Streptococcus mutans at different time points.   Group A Group B A vs. B2   Without LPO With LPO   Time Reduction factor Comparisons within A1 Reduction Factor Comparisons within B1       1 vs. 3 3 vs. 5 5 vs. 15   1 vs. 3 3 vs. 5 5 vs. 15   [min] Mean ± SD p p p Mean ± SD p p p p 1 0.23 ± 0.26       0.03 ± 0.17       0.128 0.844 0.016                 3 0.21 ± 0.36       0.53 ± 0.22       0.026 0.375 0.