Here we report an analysis of the role of HGF/c-Met related β-cat

Here we report an analysis of the role of HGF/c-Met related β-catenin activation and CTNNB1 mutation activation of β-catenin in a large cohort of 84 patients with hepatoblastoma.

This characterisation of β-catenin activation by the c-Met pathway may have clinical relevance because several HGF/c-Met small molecule inhibitors are now in early phase clinical trials. Materials and methods Patients and SIOPEL HB clinical trials SIOPEL Liver tumor clinical trials are international, prospective, clinical STI571 trials run under the auspices of the SIOP Liver Tumor Strategy Group (SIOPEL). Our cohort comprises patients prospectively enrolled into the SIOPEL 3 clinical trial, a randomised study which opened in March 1998, designed to evaluate the effectiveness of preoperative chemotherapy for standard risk (SR) HB with either cisplatin (CDDP) alone or in combination with learn more doxorubicin (PLADO). A detailed description of the SR patient cohort, its clinical features, staging and outcome has previously been reported [33]. SIOPEL 3 patients with high risk (HR) HB were all treated preoperatively with SUPERPLADO, a three-drug combination of Cisplatin, Doxorubicin and Carboplatin and the results have been reported [34]. All patients were recruited to the SIOPEL 3 clinical trial

with appropriate informed consent. This specific study was reviewed and approved by the New Zealand Health Research Council Multi-regional ethics committee (MREC). Tumor samples In this study we have accessed a representative cohort

of 84 HB patients with clinical, histologic and survival data available for most samples. Both diagnostic and post-chemotherapy samples were available for fourteen patients bringing the total number of samples analysed to 98. In the case of diagnostic samples there was generally just a single formalin-fixed paraffin-embedded (FFPE) tumor block available containing the entire biopsy material on which the diagnosis was made. For each post-chemotherapy Urease case, the most representative FFPE block was identified by examination of slides stained with haematoxylin and eosin (H+E). From the H+E slides, representative tumor and adjacent normal tissue areas were selected by a pathologist (C.M.) for subsequent tissue array construction. Tissue Array Construction A tissue microarray (TMA) was constructed by depositing a 1 mm core of each tumor or normal tissue into a wax recipient block using the Manual Tissue Arrayer I (Beecher Instruments Inc., Sun Prairie, WI, USA). In cases where tumor heterogeneity was evident, different representative areas of the tumor were sampled for TMA construction.

coli (containing bla CTX-M-15 and bla TEM-1 genes) isolated from

coli (containing bla CTX-M-15 and bla TEM-1 genes) isolated from a Belgian patient with ventilator-associated pneumonia Trichostatin A travelling back from Egypt [21]. To date reports from the Middle East has been focused on the sporadic and selective E. coli O25b-B2-ST131 cases [22] and a comprehensive study on the epidemiology of this lineage was lacking. Therefore we aimed to address this issue by systematically characterising the multi-drug resistant (MDR) isolates of E. coli O25b-B2-ST131 recovered from patients in order to use these findings as a source

for future reference studies and surveillances. Methods Bacterial isolates A survey of Extended Spectrum β-lactamase (ESBL)-producing Enterobacteriaceae was undertaken from January 2010 to December 2012. A subset of 832 MDR E. coli strains was collected from the microbiology laboratories of three major hospitals that serve the six governorates of Kuwait. All the three hospitals are tertiary health care providers with bed capacities of 300 for Ahmadi, 500 for Amiri and 600 for Yiaco-Adan. The average number of specimens processed each day varies from 500 to 700 which includes samples from out-patient and in-patient specialists units. 832 original isolates represent a subset of the isolates submitted to the clinical diagnostic laboratories

of these centres. Each patient was included only once in this study. A database this website was created based on the patient’s records that contained information; such as age, sex, hospital, location of care on each site, type of specimen and date of sampling. Specimens were

processed by clinical Phospholipase D1 staff members of the diagnostic laboratories using standard protocols. Cultures were performed on blood agar, MacConkey, Cystine lactose electrolyte deficient agar (CLED) and incubated aerobically and anaerobically as required. All isolates were identified at the species level based on colony morphology, biochemical analysis and by using Vitek2 (Vitek AMS; bioMérieux Vitek Systems Inc., Hazelwood, MO, USA). The isolates were stored in 10% skim milk and at -70°C. To confirm the phylogenic grouping of E. coli O25b-B2-ST131, PCR amplification of the pabB, trpA, chuA, yjaA genes [23] and DNA fragment of TSPE4.C2 were carried out as described before [24]. The products were sequenced from both directions and analysed. Antimicrobial susceptibility testing Antimicrobial susceptibility testing was determined by automated broth microdilution method (Vitek2) (Vitek AMS; BioMérieux Vitek Systems Inc., Durham, NC, USA) and the results were analysed according to the Clinical and Laboratory Standards Institute, CLSI (2012) guidelines [25].

The replication kinetics of the galU mutant within J774 or RAW 26

The replication kinetics of the galU mutant within J774 or RAW 264.7 cells were indistinguishable from those of the WT strain (Figure 1C), indicating that mutation of the galU gene had no effect on uptake or intracellular survival/replication of the bacterium. Virulence of the galU mutant in vivo To determine whether the galU gene is important for FT virulence, C57Bl/6J mice (5/group) were inoculated intranasally with 5 × 104 CFU (50 × LD50) of either HDAC inhibition the galU mutant or WT FT and then were monitored for 15 days. Each of the mice challenged with the galU mutant experienced transient weight loss but

survived and completely cleared the infection, while all of the mice challenged with WT FT lost weight continually until they succumbed to tularemia (Figure 2A and

2B). An additional challenge trial in which C57Bl/6 mice (4/group) were challenged with higher numbers of the galU mutant (up to 107 CFU) revealed that this mutant is highly attenuated, with an LD50 that is at least 5 logs higher than that of WT FT (Figure 2C). Moreover, trans-complementation of the galU mutation completely restored virulence of the mutant strain (Figure 2A). These findings indicated that FT virulence in mice is dependent on the expression of a functional galU gene product. Figure 2 Mutation of the galU gene Selleck HSP990 attenuates virulence of FT. C57BL/6 mice were infected intranasally with 5 × 104 CFU of WT (n = 9), the galU mutant (n = 10), or the galU-complemented strain (n = 5) strain of FTLVS, and their survival (Panel A) and weight (Panel B) were monitored. Statistical analyses of survival curves was performed using Gehan-Breslow-Wilcoxon tests and a p value of 0.005

is indicated (**). Statistical analysis of body weight retention was performed via one-way ANOVA with a Bonferroni multiple comparisons post-test and a p value of <0.0001 is indicated (***). Panel C: Survival was also monitored in C57Bl/6J mice challenged with a range of higher doses of the galU mutant (1 × 105-1 × 107 CFU; n = 4) or WT FT (5 × 104 CFU; n = 5). Statistical analysis of survival curves was performed using Gehan-Breslow-Wilcoxon Galeterone tests and p values of 0.027 (*) and 0.009 (**) are indicated. Results shown are representative of two experiments of similar design. To determine whether the reduced virulence of the galU mutant was the result of defective replication and/or dissemination of the bacterium in vivo, we performed a kinetic analysis of bacterial burdens following infection. C57Bl/6J mice (16/group) were challenged with 5 × 104 CFU of either the galU mutant or WT FT and then four mice were sacrificed at each time point (24, 48, 72, and 96 h post-infection) for bacterial burden determinations from the lungs, livers, and spleens (Figure 3).

The clinical delimma comes when we are faced with patients who pr

The clinical delimma comes when we are faced with patients who present with hip fracture and had undergone BMS implantation <4 weeks or DES implantation <12 months ago. There are three options that can be considered for the anti-platelet regimen. Firstly, one PD173074 supplier can choose to continue dual anti-platelet therapy [22] throughout the peri-operative period if possible. Secondly, since anti-thrombotic agents (e.g., low-molecular-weight heparin) are often used as thromboembolic prophylaxis in hip fracture, one can implement it as bridging therapy [21] to substitute for dual anti-platelet therapy. Although success with bridging therapy has been reported, prospective studies are necessary to validate it

as a viable management strategy. Recent studies [23] have recommended bridging therapy with glycoprotein IIb/IIIa inhibitors primarily for those who have not completed dual anti-platelet therapy and in patients whose stent complexities and comorbidities significantly increase their risk for developing catastrophic stent thrombosis. The final option is discontinue thienopyridine preoperatively and following the hip fracture surgery, the

thienopyridine should be restarted [24], with or without a loading dose, as soon as it is deemed safe. Primary percutaneous coronary intervention is the definitive treatment for peri-operative stent thrombosis as administration of thrombolytic is contraindicated this website in patients with recent surgery. Hence, for patients with previous coronary stenting, hip fracture surgery should ideally be performed in institutions where 24 h interventional cardiology Bcl-w services are available to provide emergent intervention if the need arises. Anti-thrombotic agents for thromboembolic prophylaxis Venous thromboembolism is one of the leading causes of peri-operative morbidity and mortality in patients with hip fracture. In the absence of thromboembolic prophylaxis, the prevalence of venography-detected proximal deep venous thrombosis was 27% in patients who had undergone hip fracture surgery [25]. The incidence of fatal pulmonary embolism ranges from 0.4% to 7.5% of

patients within 3 months of hip fracture surgery. Although thromboembolic prophylaxis is a routine aspect of care in patients with hip fracture, there is no clear-cut guideline regarding the optimal agent, the timing and duration of prophylaxis. Whether to initiate thromboembolic prophylaxis before or immediately after surgery is still unclear. Deep venous thrombosis may begin as early as the time of hip fracture. Until more definitive data is available, it is reasonable to initiate anti-thrombotic therapy as soon as patient is admitted into hospital. The American College of Chest Physicians (ACCP)guidelines [26] recommend the use of three agents for thromboembolic prophylaxis namely fondaparinux, unfractionated heparin (UFH) and low-molecular-weight heparin (LMWH).

e height and IGF-1 less than or equal to −3 SDS, normal GH secre

e. height and IGF-1 less than or equal to −3 SDS, normal GH secretion, after Akt inhibitor poor compliance with scheduled GH injections has been ruled

out). In cases where compliance is a question, the recombinant human GH (rhGH) should be administered by a reliable source. 3 The IGF-1 Generation Test The principle behind the design of the IGF-1 Generation Test (IGFGT) was that repeated injections of human GH induce measurable increases in IGF-1, IGFBP-3 and ALS secretion. However, in GH-deficient patients, the degree of IGF-1 response did not convincingly predict the growth response to GH therapy [13]. Because of this, the IGFGT is primarily a research tool. Performing the IGFGT is not necessary to make a diagnosis of SPIGFD, nor should it be required to begin mecasermin replacement; meeting the less than or equal to −3 height and IGF-1 SDS criteria in the setting of normal-to-high GH is sufficient to make the diagnosis of SPIGFD. 4 Treatment 4.1 IGF-1 (Mecasermin rDNA) Administration Once a diagnosis of SPIGFD has been made, it is important to begin treatment with mecasermin as soon as possible. Growth rates are highest during the first year of treatment [6], and both first-year catch-up growth

and long-term outcomes, such as adult height, are better when therapy is initiated in younger children at an appropriate dose [10, 14]. Treatment with mecasermin involves twice-daily ATM inhibitor injections [6], ideally over a period of years to maximize adult height, and compliance is crucial to achieve both optimal growth outcomes and safety.

In our practices, treatment therefore begins with extensive family discussions. 4.2 Side Effects Patients and caregivers must be familiar with all the risks and benefits of treatment, especially with regard to common side effects of mecasermin, including symptoms of hypoglycemia. The most common side effects of mecasermin therapy are listed below [6]. Hypoglycemia is often present before treatment in patients with SPIGFD, particularly young children with the phenotype of Laron syndrome [15]. Treatment selleck products with mecasermin may exacerbate this, especially during the early stages of therapy. Information about the occurrence of hypoglycemia should be sought even before beginning mecasermin. The dose of mecasermin should be increased more slowly in children with a prior history of hypoglycemia. Younger patients, who may have difficulty articulating symptoms, should be monitored carefully during the treatment initiation phase. Hypoglycemic episodes are minimized through adequate carbohydrate (or caloric) intake along with each injection and by avoiding overdose; we advise administration within 20 min of a meal or snack [6], and provide training in dose calculation and delivery.

Care should be taken not to use high-osmolar contrast media for i

Care should be taken not to use high-osmolar contrast media for intravascular use Table 12 Invasive diagnostic imaging including Selleckchem FK228 cardiac angiography or percutaneous catheter intervention Table 13 Intravenous contrast media imaging including contrast-enhanced CT Table 14 Prevention of CIN: fluid therapy Fluid Therapy to Prevent CIN Physicians should consider adjusting fluid volume for patients in whom fluid therapy may cause heart failure. See Tables 15 and 16. Table 15 Prevention of CIN: pharmacologic therapy and dialysis Table 16 Treatment of CIN: pharmacologic

therapy and dialysis References 1. Kidney Disease: Improving Global Outcomes (KDIGO) CKD Work Group. KDIGO 2012 clinical practice guideline for the evaluation and management of chronic kidney disease. Kidney Int Suppl. 2013;2013(3):19–62. 2. Lameire N, Adam A, I-BET151 mouse Becker CR, Davidson C, McCullough PA, Stacul F, CIN Consensus Working Panel, et al. Baseline renal function screening. Am J Cardiol. 2006;98:21K–6K [VI].PubMedCrossRef 3. Dangas G, Iakovou I, Nikolsky E, Aymong ED, Mintz GS, Kipshidze NN, et al. Contrast-induced nephropathy after percutaneous

coronary interventions in relation to chronic kidney disease and hemodynamic variables. Am J Cardiol. 2005;95:13–9 [IVb].PubMedCrossRef 4. Rihal CS, Textor SC, Grill DE, Berger PB, Ting HH, Best PJ, et al. Incidence and prognostic importance of acute renal failure after percutaneous coronary intervention. Circulation. 2002;105:2259–64 Cediranib (AZD2171) [IVb].PubMedCrossRef 5. Weisbord SD, Mor MK, Resnick AL, Hartwig KC, Palevsky PM, Fine MJ. Incidence and outcomes of contrast-induced AKI following computed tomography. Clin J Am Soc Nephrol. 2008;3:1274–81 [IVa].PubMedCrossRef

6. Kim SM, Cha RH, Lee JP, Kim DK, Oh KH, Joo KW, et al. Incidence and outcomes of contrast-induced nephropathy after computed tomography in patients with CKD: a quality improvement report. Am J Kidney Dis. 2010;55:1018–25 [IVb].PubMedCrossRef 7. Stacul F, van der Molen AJ, Reimer P, Webb JA, Thomsen HS, Morcos SK, Contrast Media Safety Committee of European Society of Urogenital Radiology (ESUR), et al. Contrast induced nephropathy: updated ESUR Contrast Media Safety Committee guidelines. Eur Radiol. 2011;21:2527–41 [VI].PubMedCrossRef 8. McCullough PA. Contrast-induced acute kidney injury. J Am Coll Cardiol. 2008;51:1419–28 [I].PubMedCrossRef 9. Rudnick MR, Goldfarb S, Wexler L, Ludbrook PA, Murphy MJ, Halpern EF, et al. Nephrotoxicity of ionic and nonionic contrast media in 1196 patients: a randomized trial. The Iohexol Cooperative Study. Kidney Int. 1995;47:254–61 [II].PubMedCrossRef 10. Parfrey PS, Griffiths SM, Barrett BJ, Paul MD, Genge M, Withers J, et al. Contrast material-induced renal failure in patients with diabetes mellitus, renal insufficiency, or both. A prospective controlled study. N Engl J Med. 1989;320:143–9 [III].PubMedCrossRef 11. McCullough PA, Bertrand ME, Brinker JA, Stacul F.

Therefore, both σF-dependent genes with a putative assigned funct

Therefore, both σF-dependent genes with a putative assigned function appear to play a role in sulfate acquisition by cells. Interestingly, Hu et al. (2005) found a strong down-regulation of a Caulobacter sulfate ABC transport system under chromate and dichromate exposure. While this detoxification

strategy apparently contributes to decrease the concentration of chromate and dichromate in the cells [4], sulfate uptake from the extracellular environment might be significantly affected. Alternative sources such as degradation of sulfur-containing amino-acids [25] and organosulfonate metabolism [26] can be used to counteract this sulfur uptake limitation [1, 27–29]. It is therefore conceivable that induction of CC2748 and CC3257 could supply cells with sulfate. This is consistent with the observation that in Arthrobacter sp. strain FB24 and Pseudomonas putida, learn more chromate exposure also results in increased levels of proteins potentially involved Selleckchem URMC-099 in reversing the effects of cellular sulfur limitation, such as transporters of alternative sulfur sources [27, 28]. Curiously, none of the most representative functional categories up-regulated under chromate, dichromate or cadmium exposure (protection against oxidative stress and reduction of intracellular

metal concentration) were found to be controlled by σF, indicating that additional molecular systems are engaged in C. crescentus response to these metals. In fact,

we previously reported the involvement of the paralogous sigma factors σT and σU in the control of response to chromium and Thymidine kinase cadmium [14, 15, 30] and σE in response to cadmium [14, 15, 30]. The observation that σF, σE and σT/σU regulate distinct sets of genes indicates that each of these sigma factors make a different contribution to the C. crescentus response to metal stress. Together, σF, σE, σT and σU are responsible for the induction of 20% of the genes previously found to be up-regulated under cadmium stress and σF, σT and σU control the expression of about 12% of genes induced following Caulobacter exposure to chromate or dichromate (Additional file 1: Table S1). Therefore, transcriptional regulators other than σF, σE, σT and σU appear to be involved in the response to chromate, dichromate and cadmium. The existence of several molecular systems contributing to the transcriptional response to metal stresses could explain why the absence of sigF, CC2906 or CC3255 does not decrease the viability of Caulobacter cells under dichromate or cadmium stresses. In agreement, we previously reported that σE elicits a rapid response to cadmium, but cells lacking rpoE are not impaired in survival to this stress condition [14, 15, 30]. Interestingly, sigF is not highly induced under either chromium or cadmium stress, different from what was observed for other ECF sigma factor genes such as rpoE and sigT in C.

2) Determination

of surgical approach: The classical appr

2) Determination

of surgical approach: The classical approach to traumatic intra-thoracic bleeding is via a postero-lateral thoracotomy. However, the exception to this is when there is concern for a concurrent intra-abdominal injury or a right-sided thoracic outlet injury; exposure to both of these areas are significantly limited in the lateral decubitus position required for a postero-lateral approach. The recommended exposure for proximal subclavian Selleck Duvelisib injuries is via a median sternotomy or clavicular resection [7, 8], best accomplished with the patient supine. Therefore, the decision hinged upon which represented the best compromise: attempting to address a thoracic injury via an anterior approach, or attempting to deal with potential mediastinal or abdominal injuries in a patient in lateral decubitus position. We selected the supine approach with the rationale that this provided the best compromise given the range of possible injuries. Therefore, the initial incision would reasonably be an antero-lateral thoracotomy to best delineate the actual source of bleeding, which was accomplished. 3) Pathogenesis of elevated intra-thoracic pressure: Our patient was at risk this website for elevated thoracic cavity pressures due to space-occupying hemostatic packing of the pleural space and decreased compliance of the chest wall secondary to increased edema from systemic resuscitation

and direct tissue trauma. Teicoplanin However, in most circumstances neither situation alone would have precipitated a TCS, as the amount of packing in the chest amounted to only approximately 1 L worth of clot, and the amount of resuscitation was, while considerable, not unheard of. We believe that a significant contributing factor was the decreased chest wall compliance secondary to the substantial tissue injury

accompanying the trap-door thoracotomy. The trap-door needed to be reflected laterally to gain exposure, breaking the ribs involved (see Figure 2). The direct tissue trauma and degree of systemic resuscitation resulted in greater amounts of chest wall edema than would normally be experienced. Decompressive thoracotomy, through reopening of the trap-door incision, allowed free expansion of the right lung with consequent improvement in ventilation, respiratory acidosis and cardiac function. 4) Open-chest management: Given the improvement in respiratory function following reopening of the chest, we decided that it would have been unwise to attempt re-closure of the chest wound. In the cardiac surgery literature, prevention and treatment of TCS rely on reduction of intra-thoracic pressure and delayed sternal closure [2–6]. Management techniques range from loose closure with synthetic materials or skin flaps to leaving the chest open and packed [2]. In the case presented by Kaplan et al [1], open chest management was reported, where the chest was packed and covered with a sterile, occlusive, water impermeable drape.

Recombination was confirmed by PCR and sequencing, using oligonuc

Recombination was confirmed by PCR and sequencing, using oligonucleotide primers homologous to chromosomal DNA flanking the modified region (sequencing provided by the Birmingham Functional Genomics laboratory). Note: in addition, dilutions of the culture were routinely plated onto LB agar plates and LB agar plates supplemented with 200 μg/ml of ampicillin, to quantify the amount of donor plasmid digestion by I-SceI and LB agar plates and LB agar plates supplemented with 35 μg/ml chloramphenicol, to quantify pACBSCE digestion by I-SceI. Construction of pDOC derivatives for generating lacI gene fusions Four

different lacI gene fusions buy Quizartinib were constructed in MG1655, producing the following recombinant proteins; LacI::6 × His, selleck kinase inhibitor LacI::3 × FLAG, LacI::4 × ProteinA and LacI::GFP. For the LacI::6 × His construct, two primers were designed to amplify the 6 × his coding region and the kanamycin cassette

from pDOC-H: the first primer, D60113, included 27 bp of homology to the C-terminus of lacI, excluding the stop codon, and 18 bp homology to pDOC-H and was designed so that the 6 × his sequence was in frame with the lacI coding sequence. The second primer, D60114 included 27 bp of homology to the region immediately downstream of lacI, and homology to the P-REV annealing sequence. These primers were used to amplify the kanamycin resistance cassette, using pDOC-H as a template, and a proof-reading thermostable DNA polymerase that produces a blunt-ended amplicon. The resulting fragment was blunt end ligated into the EcoRV site of pDOC-C. The cloned region was sequenced using primers D58793 and D58794, which anneal to the S1 and S2 sites (Figure 2) in the pDOC-C plasmid. The resulting plasmid was then used to tag the chromosomal lacI gene in E. coli strain MG1655 by gene doctoring. Recombinants were checked by PCR and sequencing using primers D61347, which anneals within the lacI gene, and D57785, which anneals to the CC1 sequence shown in Figure 2. The lacI::3 × FLAG, lacI::4 × ProteinA and lacI::GFP gene fusions

were made using longer regions of homology to the chromosome, cloned directly into the pDOC-F, pDOC-P and pDOC-G cloning regions. The C-terminal 200 bp of the lacI Tenofovir gene, excluding the stop codon, was amplified by PCR using primers D59400 and D59401, and cloned into CR1 of the appropriate tagging vector, on a EcoRI:KpnI fragment, arranged so that the coding sequence of the gene was in frame with the epitope tag. Next, a 200 bp region of the lacZ gene (codons 130-205) was amplified by PCR using primers D59402 and D59403 and cloned into CR2 of the appropriate tagging vector, on a XhoI:NheI fragment. The resulting plasmids were then used to tag the chromosomal lacI gene in E. coli strain MG1655 by gene doctoring. Recombinants were checked by PCR and DNA sequencing as before.

PubMedCrossRef 32 Yeo TW, Lampah DA, Gitawati R, Tjitra E, Kenan

PubMedCrossRef 32. Yeo TW, Lampah DA, Gitawati R, Tjitra E, Kenangalem E, McNeil YR, Darcy CJ, Granger DL, Weinberg JB, Lopansri BK, Price RN, Duffull SB, Celermajer DS, Anstey NM: Impaired nitric oxide bioavailability and L-arginine-reversible endothelial dysfunction in adults with falciparum malaria. J. Exp. Med. 2007, 204:2693–2704.PubMedCrossRef 33. Dowling DP, Ilies M, Olszewski KL, Portugal S, Mota MM, Llinás M, Christianson DW: Crystal structure of arginase from and implications find more for L-arginine depletion in malarial infection. Biochemistry 2010,49((26):5600–5608. 6PubMedCrossRef 34. Bradford MM: A rapid and sensitive for the quantitation

of microgram quantitites of protein utilizing the principle of protein-dye binding. Analytical Biochem. 1976, Torin 2 research buy 72:248–254.CrossRef 35. Protocols for the preparation of blood plasma and serum. http://​www.​proimmune.​com Competing interests The authors declare that they have no competing interests. Authors’ contributions MK was involved in the transfection experiments, AS was responsible for the RT-PCR and Western Blot experiments. AKM and CHS performed the

P. berghei transfection. BAM and TB were involved in the cloning of siRNA oligonucleotides. AK participated practically in the colorimetric assays and Western Blot experiments, prepared the manuscript and organized financial support, AKM and JH critically appraised the manuscript. We thank Barbara Langer for excellent technical assistance. All authors read and approved the final manuscript.”
“Background Aflatoxins (AFs) are a group of polyketide metabolites produced by several toxigenic species of Aspergillus such as A. flavus and A. parasiticus after infections of seeds with high protein and lipid contents, e.g. peanut, corn and walnut [1–3]. AFs are toxic and carcinogenic, posing serious threats to both animal and human health [4].

Extensive studies Digestive enzyme carried out in A. flavus and A. parasiticus lead to the identification of a 70 kb DNA cluster consisting two specific transcriptional regulators (aflR and aflS), and 26 co-regulated downstream metabolic genes in the AF biosynthetic pathway [5–8]. Expressions of aflR and aflS are further regulated by global regulators such as the CreA transcription factor and the VelB/VeA/LaeA complex, and possibly by a cell surface-localized G-protein coupled receptor complex [2, 9, 10]. Various nutritional and environmental factors including carbon sources [11], nitrate [12], light [13], temperature [14, 15], pH [14, 16], and oxygen availability [17–19] affect AF productions and expressions of AF biosynthesis-related genes [9, 20, 21]. It has been known for a long time that sugars and related carbohydrates support both fungal growth and AF production. However, peptone, a mixture of protein degradation products, is a preferred carbon source for fungal growth, but not for AF production [11, 22–25]. Many studies have been carried out to elucidate how various carbon sources affect AF biosynthesis.