Lanqing Zhao1, Chunna Zhao2, Zhongdong Du2 and Hongwu Du1*
1112 Lab, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
2Department of Pediatrics, Beijing Children’s Hospital Affiliated to Capital Medical University, Beijing, China
Received: 18 January, 2016; Accepted: 10 February, 2016; Published: 20 February, 2016
Hongwu Du, PhD, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Beijing 100083, P. R. China, Tel: +86 10 62334497; Fax: +86 10 62332462; E-mail:
Zhao L, Zhao C, Du Z and Du H (2016) Lactate Dehydrogenase is involved in but not the Target Antigen in Children with Kawasaki Disease. J Cardiovasc Med Cardiol 3(1): 007-011. DOI: 10.17352/2455-2976.000021
© 2016 Zhao L, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Lactate dehydrogenase; Kawasaki disease; Expression and purification; Antigenicity analysis; Autoimmune target
AP: Acute Pneumonia; BP: Bronchopneumonia; DTT: Dithiothreitol; FC: Febrile Control; HC: Healthy Control; IVIG: Intravenous Immunoglobulin; KD: Kawasaki Disease; LDH: Lactate Dehydrogenase; LDHA: Lactate Dehydrogenase A; MIP: Multiple Infection Pneumonia; MP: Mycoplasma Pneumonia; MS: Mass Spectrometry; VP: Viral Pneumonia;
Background: Kawasaki disease (KD) is an acute vasculitis often complicating coronary arterial lesions, and gradually becomes the leading cause of acquired heart disease instead of rheumatism. Previous studies often regards elevation of serum lactate dehydrogenase (LDH) level as an auxiliary diagnosis marker when judging myocardial diseases.
Methods: We analyzed the serum LDH levels in newly confirmed KD patients, compared with febrile non-KD patients and healthy donors as controls. Then a subtype of LDH protein (LDHA) were over-expressed and purified for antigenicity analysis of potential anti-LDHA autoantibodies in IgA, IgM and IgG isotype by homemade ELISA, respectively.
Results: An obvious elevation serum levels of LDH was found in 5/27 KD patients (19%, p<0.05) and 16/27 febrile non-KD patients (59%, p<0.001). None of IgA or IgM isotype of anti-LDHA antibodies were detected in all cases, and only low titer IgG antibodies were detected in KD patients (7%) and febrile non-KD patients (11%).
Conclusions: Our results demonstrated the LDH was associated but not the main autoimmune target in children with KD.
Kawasaki disease (KD), mainly affects children younger than five years old, is an acute vasculitis first described in 1967 . Although KD remains a mysterious disease and has still not been fully understood [2,3], infection was generally thought playing an important role in the KD pathogenesis . Some microorganism, especially bacteria and viruses, may be the first “driver” of KD , but no specific pathogen and other autoimmune target have been precisely identified [2-5]. The diagnosis of KD is still based on clinical characteristics, and generally fever plus five specific criteria are required for diagnosis of KD according the suggestion by the American Heart Association [3,6]. So far, no laboratory serum test could auxiliary diagnose KD with specificity [6,7]. Thus, some sick children who delayed diagnosis and treatment of KD may lead to severe coronary arterial lesions or even death. Currently, about 25% KD patients without timely confirmed diagnosis will further develop coronary artery aneurysms . To date, KD gradually becomes one of the leading causes of acquired heart disease worldwide for infants and young kids [9-13].
Lactate dehydrogenase (LDH) is extensively existed in many human somatic tissues and organs. Serum level of LDH is widely considered as an auxiliary marker in early stage of diseases to predict progression or severity of tissue damage in various diseases including necrotising enterocolitis, nasopharyngeal carcinoma and pneumonia [14-17]. For KD patients, LDH level > 590 IU/L is proposed as one predictor for assessing resistance to intravenous immunoglobulin (IVIG) therapy [18,19]. Macrophage activation syndrome, a complication of KD, is also characterized by elevated serum LDH [20,21]. LDH are homotetramers or hereotetramers composed of muscle and heart subunits, which is encoded by LDHA and LDHB gene. More specially, LDHA is made up of four muscle subunits and expressed in most somatic tissues.
In this study, elevation of LDH was found in some KD patients and febrile non-KD patients. To investigate the potential correlation between KD and LDHA, recombinant human LDHA was over-expressed in E. coli Rosetta (DE3) and purified by Ni-chelating affinity chromatography. Then anti-LDHA autoantibodies were tested for IgA, IgM, IgG isotype by homemade ELISA with sera from confirmed KD patients, febrile non-KD patients and healthy donors, and correlation between serum LDH level and anti-LDHA antibodies were analyzed.
Materials and Methods
All serum samples were provided from Beijing Children’s Hospital Affiliated to Capital Medical University during March of 2013 to Jan of 2014. Totally 71 subjects were enrolled in this study, including 27 KD patients, 27 febrile non-KD and 17 age matched healthy donors, and detailed clinical data were listed in Supplementary Table 1. The criteria of KD diagnosis was according to the 5th revised edition issued by the Japan Kawasaki Disease Research Committee in 2002 [22-24]. Febrile non-KD patients were all confirmed pneumonia patients with more than 3 days fever, and fall into 5 categories: mycoplasma pneumonia, viral pneumonia, acute pneumonia, bronchopneumonia and multiple infection pneumonia. Serum LDH levels were analyzed by UniCel DxC 600 Synchron Clinical Systems (Beckman Coulter Inc, CA). The research conformed to the Declaration of Helsinki Principles.
Expression and purification
The procedure of human LDHA expression and purification was performed by following our routine method . Briefly, LDHA gene was amplified by PCR with template cDNA from EA.hy926 cells. After digested by endonucleases, target gene was inserted into pET-28a-c(+) vectors by T4 DNA ligase, and then transformed into E. coli Rosetta (DE3) (CW biotech, Beijing, China). Next, the recombinant E. coli was cultured in solid LB medium with added 50 μg/mL kanamycin at 37, overnight. Then several colonies were picked visually and proliferated separately in fresh 5 mL liquid LB medium added with 50 μg/mL kanamycin at 37, 200 rpm. After OD reached 0.4~0.6, IPTG was added with final concentration of 1 mM. Five hours later, the E. coli cells were acquired by centrifugation at 4, 12000 rpm and ultrasonically disrupted on ice. Then the supernatant and insoluble fractions were analyzed by SDS-PAGE, respectively. Finally, the recombinant LDHA was purified by Ni-chelating affinity chromatography, followed by desalination and renaturation.
MS analyses were applied to identify results of expression of LDHA . Firstly, the positive protein band on SDS-PAGE gel was excised manually and transferred to a clean 1.5 mL tube. Then the gel was cut into 1-2 mm3 cubes, then washed with 100 μL 25 mM NH4HCO3 in 50% acetonitrile for 15 min. After drying in a vacuum centrifuge (Savant Instruments, NY), the pieces were added with 100 μL 10 mM dithiothreitol (DTT) in 25 mM NH4HCO3, then incubated for 2 h at 37. Next, solution of 55 mM iodoacetamide in 25 mM NH4HCO3 took place of the DTT by same volume, and incubated at room temperature for 1 h in the dark. Afterwards, the pieces were washed with 100 μL 50% acet onitrile in 25 mM NH4HCO3 for 10 min. After dried by the vacuum centrifuge, the gel was added 20 μL 50 mM NH4HCO3 buffer containing 12.5 ng/μL trypsin (Sigma-Aldrich, MO) and then incubated for 1 h at 4. Then the supernatant was removed and replaced by same volume 50 mM NH4HCO3 without trypsin to continue digesting for 12~16 h at 37. Finally, the pieces were applied to MS analysis by LC-MALDI-TOF/TOF (ABI45800 Proteomics Analyzer, Applied Biosystem, MA).
The ELISAs were performed according our standard procedure with slight modifications [26-28]. In brief, recombinant LDHA was diluted at 100 ng/mL by dissolving in 0.05 M carbonic buffer and then added into 96-well microplate 100 μL per well. The plates were placed quietly overnight at 4 and then blocked by 5% goat serum for 2 h at 37. Next, sera of KD patients, febrile non-KD patients and healthy controls (diluted at 1:1000) were respectively added and incubated for 1 h at 37. Then the 96-well plates were washed by 1‰ PBST buffer, followed by incubating HRP-conjugated goat anti-human IgA, IgG, and IgM antibody (diluted at 1:10000) for 1 h at 37, respectively. After that, an ELISA reader (Tecan, Switzerland) was used for quantitative data analysis at 450/620 nm.
Peptide mass fingerprints were analyzed by Mascot (Matrix Sciences, UK), and protein scores greater than 70 were considered significant (p<0.05). Data of LDH serum levels and ELISA were analyzed by SPSS 17.0 (SPSS Inc, IL), and differences were evaluated by t-test. If p value were < 0.05, statistical significance should be considered. The cut-off value of positive definition was defined as Mean + 3SD.
Clinical significance of sera LDH levels
Sera LDH levels were respectively measured in KD and controls (Table 1). LDH levels were 247 (178-301) IU/L in healthy children, and the cut-off value was defined as 348 IU/L. Figure 1 showed significant differences in KD (p=0.0352) and febrile non-KD (p=0.0005), with respective LDH level of 294 (152-573) IU/L and 440 (233-1058) IU/L. Elevation of LDH were observed in 5/27 (19%) KD patients and 16/27 (59%) febrile non-KD. The results proved lactate dehydrogenase not only increasing in KD patients, but with a higher elevation in other conditions.
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