- Open Access
The early asthmatic response is associated with glycolysis, calcium binding and mitochondria activity as revealed by proteomic analysis in rats
© The Author(s) 2010
Received: 12 November 2009
Accepted: 6 August 2010
Published: 6 August 2010
The inhalation of allergens by allergic asthmatics results in the early asthmatic response (EAR), which is characterized by acute airway obstruction beginning within a few minutes. The EAR is the earliest indicator of the pathological progression of allergic asthma. Because the molecular mechanism underlying the EAR is not fully defined, this study will contribute to a better understanding of asthma.
In order to gain insight into the molecular basis of the EAR, we examined changes in protein expression patterns in the lung tissue of asthmatic rats during the EAR using 2-DE/MS-based proteomic techniques. Bioinformatic analysis of the proteomic data was then performed using PPI Spider and KEGG Spider to investigate the underlying molecular mechanism.
In total, 44 differentially expressed protein spots were detected in the 2-DE gels. Of these 44 protein spots, 42 corresponded to 36 unique proteins successfully identified using mass spectrometry. During subsequent bioinformatic analysis, the gene ontology classification, the protein-protein interaction networking and the biological pathway exploration demonstrated that the identified proteins were mainly involved in glycolysis, calcium binding and mitochondrial activity. Using western blot and semi-quantitative RT-PCR, we confirmed the changes in expression of five selected proteins, which further supports our proteomic and bioinformatic analyses.
Our results reveal that the allergen-induced EAR in asthmatic rats is associated with glycolysis, calcium binding and mitochondrial activity, which could establish a functional network in which calcium binding may play a central role in promoting the progression of asthma.
Asthma is a common yet complex disorder that affects the airways of an estimated 300 million people of all ages. As a widespread disease, asthma places heavy economic burdens on both individuals and society . Despite advances in understanding the pathogenesis of asthma and the development of new anti-asthma therapies, the prevalence and morbidity and mortality rates of the disease have continuously increased worldwide over the past two decades . While the currently available anti-inflammatory and muscle-relaxing drugs are effective in controlling the clinical symptoms, they do not prevent the natural course of asthma . A plausible explanation for this failure is that different biological mechanisms mediate the progression of asthma and asthma symptoms, and unlike the symptoms, asthma progression is insensitive to certain therapies . Therefore, it is necessary to further understand the molecular mechanisms underlying asthma progression to develop new, curative asthma drugs.
The inhalation of allergens by patients with allergic asthma results in the early asthmatic response (EAR). The EAR is characterized by an acute airway obstruction that develops within a few minutes and generally resolves within 1 to 2 h. This is usually followed by the late asthmatic response . As the early phase of the natural course of asthma , the EAR is important for the early recognition and treatment of this disease and should receive more attention. Over the past two decades, several animal models that develop the EAR have been reported [6, 7]. In our previous study, the EAR was observed 2 to 5 min after provocation in ovalbumin (OVA)-sensitized rats challenged with OVA . Moreover, the pathogenesis of the EAR has been studied by measuring physiologic parameters, variations in serum constituents and by the effect of pretreatment with various drugs . Previous evidence has demonstrated that the EAR can be associated with inflammatory mediators secreted by pulmonary mast cells in an IgE-dependent process, and following the activation of specific receptors, these inflammatory mediators have spasmogenic effects that result in abnormal airway smooth muscle (ASM) contraction [5, 9]. These findings have expanded our understanding of the EAR at different levels. However, the molecular mechanism underlying the EAR remains largely unknown. To gain insight into the protein basis of the EAR, a global protein profiling study is urgently needed.
An increasing numbers of proteomics-based asthma studies have been published in recent years, providing useful information about the disease. More importantly, these studies have identified several candidate proteins or novel biomarkers that show an association with the asthma phenotype (an elevated IgE level, bronchial hyperresponsiveness and atopy) . While these findings have furthered our understanding of asthma progression, the present challenge is to understand the natural course of asthma, including the EAR, and to build a functional model to explain the underlying molecular mechanisms of the disease. The primary purpose of this study was to investigate the protein expression patterns in the OVA-induced EAR using proteomic techniques and to elucidate the molecular basis of the EAR.
Animals and sensitization protocol
Pathogen-free, male Sprague-Dawley (SD) rats (4 weeks old, 110-130 g; SLAC Laboratory Animal Co., Shanghai, China) raised in a pathogen-free rodent facility and provided with food and water ad libitum were randomly divided into two groups-- control rats (n = 15) and asthmatic rats (n = 14). The rats were kept in animal facilities approved by the Shanghai Committee for the Accreditation of Laboratory Animals for at least 1 week before the experiments began. The animal experiments conformed to the regulations set forth by the State Science and Technology Commission.
The rats were sensitized and challenged with OVA (grade V, Sigma, Taufkirchen, Germany) according to the protocol described previously . Briefly, on day 0, rats were intraperitoneally injected with 1 mg of OVA precipitated with 10 mg of aluminum hydroxide gel in 1 ml saline. On day 14, allergic rats were anaesthetized with 1% sodium pentobarbitone (wt/vol) at a dose of 50 mg/kg by intraperitoneal injection and then challenged with 1 ml/kg of 5% OVA in saline (5 mg/kg) by injection into the external jugular vein over 10 s. The control rats received the same treatment schedule but were sensitized and challenged with saline instead of OVA.
Measurement of respiratory function
Proteins were extracted from each lung tissue sample using the ReadyPrep Sequential Extraction Kit (Bio-Rad, Hercules, CA) with the following additions to Reagent 1 added just prior to use: PMSF (1 mM), DNase (RNase-free; 20 μg/ml) and RNase (5 μg/ml). The protein concentrations were determined using a modified Bradford assay. For the 2-DE analysis, the protein extracts from each animal in a group were pooled equally according to the protein concentration and stored at -80°C until use.
Two-dimensional gel electrophoresis (2-DE) and image analysis
A fixed amount of protein (100 μg) was loaded onto 17-cm IPG strips with a linear separation range of pH 3-10 (Bio-Rad, Hercules, CA). Using a Protean IEF Cell (Bio-Rad), the first-dimensional isoelectric focusing (IEF) was performed following the protocol provided by Bio-Rad Laboratories. After equilibration in a buffer (50 mM Tris-HCl pH 8.8, 6 M urea, 20% glycerol and 2% SDS) supplemented with 2% DTT for 15 min and a second incubation in this buffer supplemented with 2.5% iodoacetamide for another 15 min, a Protean II XL cell (Bio-Rad) with a polyacrylamide gel was used for the second-dimensional separation. The proteins in the gel were visualized following silver staining and scanned with a GS-800 densitometer (Bio-Rad). The differentially expressed proteins were detected using PDQuest software version 7.1 (Bio-Rad). Only those spots with at least a threefold change in intensity (p < 0.05, t-test) were considered differentially expressed.
Proteins with significant changes in expression were excised from the gels, washed, dehydrated and digested with 12.5 ng/ml trypsin in 0.1 M NH4HCO3. Liquid-chromatography electrospray-ionization tandem mass spectrometry (LC-ESI-MS/MS) analysis was conducted using a Finnigan LTQ mass spectrometer (ThermoQuest, San Jose, CA) coupled with a Surveyor HPLC system (ThermoQuest). Protein identification using the raw MS/MS data was performed with the SEQUEST software (Thermo Finnigan) by searching against the Swiss-Prot rat protein database. The identification results were filtered based on the Xcorr (1+ ≥ 1.9, 2+ ≥ 2.2, 3+ ≥ 3.75) and the DeltCn (≥ 0.1).
To better understand the key regulated biological processes occurring during the EAR, bioinformatic analysis on the identified proteins, including the gene ontology (GO) classification, the protein-protein interaction (PPI) networking and the biological pathway exploration, were carried out using PPI Spider  and KEGG (Kyoto Encyclopedia of Genes and Genomes) Spider , which are two freely available web-based tools for the interpretation of experimentally derived protein lists in the context of a global PPI network and a metabolic network, respectively. A dataset containing the standard gene symbols of the identified proteins was uploaded. The significantly enriched GO classes (or terms), PPI networks and biological pathways were determined with the default parameter settings.
The same protein samples used for the 2-DE were analyzed, and the polyvinylidene fluoride membranes were blocked overnight in a PBS-Tween buffer with 5% nonfat milk. The membranes were then probed using antibodies specific for ERp29 (endoplasmic reticulum protein ERp29), RhoGDI2 (Rho, GDP dissociation inhibitor beta), S100A8 or β-actin in the blocking buffer. The staining was visualized using ECL reagents (Beyotime, Haimen, China). The densitometric evaluation was carried out using Quantity One software version 4.6 (Bio-Rad), and the relative quantity of an individual protein is expressed as the ratio of the gray scale respective to that of β-actin.
RNA was extracted using TRIzol reagent (Invitrogen, Carlsbad, CA) and reverse transcribed using the RevertAid First Strand cDNA Synthesis Kit (MBI Fermentas, Vilnius, Lithuania). PCR amplification was conducted using the TaKaRa RNA PCR Kit (TaKaRa, Dalian, China). The primers used were specific for S100A8, S100A11, VDAC1 (voltage-dependent anion channel 1) or β-actin (see additional file 1). The PCR products were resolved by agarose gel electrophoresis and analyzed using Quantity One software (Bio-Rad). The relative mRNA level of each individual gene is presented as the expression ratio with respect to the housekeeping gene β-actin.
Student's t-test was performed to evaluate the differences between the control and asthmatic group when the data were normally distributed, while the Mann-Whitney test was used when the data were not normally distributed. The differences among continuous data in each group obtained from the respiratory function measurement were assessed with the Kruskal-Wallis test. The statistical analysis for PPI Spider and KEGG Spider was performed using the Monte Carlo simulation procedure. A p value less than 0.05 was considered statistically significant.
Respiratory function measurement following OVA challenge
Differentially expressed proteins in the early asthmatic response
Swiss-Prot/RefSeq accession No.
Theoretical Mr (kD)/pI†
Down-regulated in Asthmatic rats
Tubulin alpha-1A chain
Heat shock cognate 71 kDa protein
Phosphatidylethanolamine-binding protein 1
predicted Coactosin-like 1
Endoplasmic reticulum protein ERp29 precursor
protein disulfide isomerase associated 6
N-acetylneuraminic acid synthase
Bifunctional purine biosynthesis protein PURH
Creatine kinase B-type
Isoform 1 of Fibrinogen beta chain precursor
Carbonic anhydrase 2
22 kDa protein
Heat shock cognate 71 kDa protein
Advanced glycosylation end product-specific receptor precursor
similar to proteasome 26 S ATPase subunit 6
22 kDa protein
Heat shock-related 70 kDa protein 2
Phosphoglycerate mutase 1
Up-regulated in Asthmatic rats
Anionic trypsin-1 precursor
Isoform M1 of Pyruvate kinase isozymes M1/M2
Sodium/potassium-transporting ATPase subunit alpha-1 precursor
similar to destrin
Glutathione S-transferase Mu 2
Tubulin alpha-1A chain
Rho, GDP dissociation inhibitor (GDI) beta
Serum albumin precursor
Phosphoglycerate kinase 1
Actin, alpha skeletal muscle
Serum albumin precursor
ATP synthase subunit alpha, mitochondrial precursor
similar to Ras suppressor protein 1
Western blot analysis of RhoGDI2, ERp29 and S100A8
mRNA Level of S100A8, S100A11 and VDAC1
To assess whether the mitochondrial activity was increased during the EAR, the mRNA expression pattern of VDAC1, an outer membrane mitochondrial protein, was investigated using RT-PCR. As seen in Figure 7, the mRNA level of VDAC1 was significantly up-regulated in the lungs of asthmatic rats compared to the controls (p < 0.01).
The EAR is the early phase of the natural course of allergic asthma and is important for the early recognition and treatment of this disease. Although a number of proteomic studies have identified several candidate proteins involved in the pathogenesis of asthma, few proteomic studies of the EAR have been reported . In this study, we compared the protein profiles of the lung tissue extracted from rats with an OVA-induced EAR with those of the controls using 2-DE/MS-based proteomic analysis. We identified 44 differentially expressed protein spots corresponding to 36 unique proteins. These proteins reflected a protein profile that changed during the disease process, which included sensitization, allergen challenge and the subsequent EAR. A functional analysis of these changed proteins revealed some possible key molecular mechanisms underlying the EAR.
Glycolysis during the EAR
Glycolysis is a fundamental system for energy metabolism in most organisms, and glycolytic enzymes are present in all mammalian cells and tissues. Over the past few decades, several lines of evidence have indicated that the EAR-associated events, including hypoxia and ASM contraction, could affect and be affected by energy and glucose metabolism [16–18]. Using a proteomic approach, our study demonstrates that the EAR is closely associated with glycolysis.
The GO analysis demonstrated that six of the identified proteins are important in glycolysis (Figure 4). Among them, phosphoglycerate kinase 1 is well known as the seventh enzyme of the glycolytic pathway, which catalyzes the reversible conversion of 1,3-diphosphoglycerate to 3-phosphoglyceric acid and a single ATP molecule. It has been recently reported that phosphoglycerate kinase 1 can enhance the glycolytic capacity of an organ and support the maintenance of cellular energetics in wood frogs with hypoxia . Pyruvate kinase catalyzes the penultimate step in glycolysis, where it transfers phosphate from phosphoenolpyruvate to ADP, leading to the formation of ATP and pyruvate. The energy regeneration by pyruvate kinase is independent of the oxygen supply, which allows for the survival of cells under hypoxic conditions . Glyceraldehyde-3-phosphate dehydrogenase is another essential glycolytic enzyme expressed in all prokaryotic and eukaryotic organisms. Its role is to convert glyceraldehyde-3-phosphate to 1,3-diphosphoglycerate during glycolysis. The significantly higher expression level of all of the above proteins in asthmatic rats suggests the up-regulation of glycolysis during the EAR. Two other glycolytic enzymes, beta-enolase and phosphoglycerate mutase, both found in the lung tissue proteome, are also rate-controlling enzymes in glycolysis. Their decreased expression could regulate the rate of glycolysis as well as the ATP-dependent reactions involved in the EAR. Our proteomic analysis indicates that glycolysis is a key regulatory biological process in the pathogenesis of the EAR. These glycolytic enzymes may facilitate the anaerobic production of ATP to meet the increasing cellular energy demands during ASM contraction in the hypoxic conditions induced by airway obstruction. It should be noted, however, that glycolysis alone may not meet the needs of the contractions because it only provides two ATP molecules from every glucose molecule while oxidative phosphorylation and lactic acid may be more efficient energy-supplying processes under hypoxic conditions. However, our results confirm the importance of energy metabolism and energy balance during the EAR, which could provide new clues for the further study of asthma.
Additionally, a recent review reported that some glycolytic enzymes are complicated, multifaceted proteins rather than simple components of the glycolytic pathway . These enzymes also possessed non-glycolytic functions involved in transcriptional regulation, the stimulation of cell motility and the regulation of apoptosis. With these multifaceted functions, glycolytic enzymes could play a role in the hyperplasia or hypertrophy of ASM cells in asthma disease. Therefore, the identification of differentially expressed glycolytic proteins in the lung tissue proteome also suggests that airway remolding may develop during the EAR.
Calcium binding during the EAR
Calcium binding is a key initiating process for the EAR because the binding of Ca2+ to calmodulin to form the Ca2+/calmodulin complex results in the activation of myosin light-chain kinase, which, in turn, mediates ASM contraction . In this study, we observed the increased expression of Ca2+-binding proteins (CaBPs) in the 2-DE analysis and further verified the increased expression of S100A8 and S100A11 using western blot and RT-PCR, respectively. In our previous study, we also reported the increased mRNA level of another CaBP, S100A9, through the serial analysis of gene expression during the EAR .
Calcium is a central player that mediates various pathophysiological reactions through binding with CaBPs. Cells contain classes of CaBPs that regulate the level of cytosolic Ca2+ and transduce intracellular Ca2+-mediated signals. S100 proteins, which are highly homologous, low-molecular weight (10-12 kDa), acidic proteins, constitute one of the CaBP families. They are believed to be involved in the regulation of Ca2+ homeostasis, smooth muscle contraction and other cellular processes through their binding to Ca2+ and interactions with various effector proteins . S100 proteins have received increased attention in the study of asthma due to their close association with inflammation . S100A8 and A9, also known as calgranulins, have been shown to play a role in the initiation and regulation of chronic and acute inflammatory diseases, including asthma [24, 25]. A study examining human asthmatic bronchoalveolar lavage fluid showed that elevated levels of S100A8 and S100A9 were strongly linked to allergic inflammation . Moreover, the inhibition of S100A8 and S100A9 could reduce the migration of inflammatory cells into the lungs in a mouse model of asthma . Recent evidence has also demonstrated that S100A8 and S100A9 are involved in a novel pro-inflammatory signaling pathway in which they contribute to the activation of central cellular pathways, including the p38 or p44/42 MAP kinases and NF-κB signaling components, which subsequently induce the expression of many pro-inflammatory molecules [28, 29]. In our studies, elevated expression levels of S100A8 and S100A9 were found in asthmatic rats, indicating that during the EAR, CaBPs such as S100A8 and A9 could trigger the asthmatic inflammatory response.
Calreticulin and protein disulfide-isomerase A6 are endoplasmic reticulum-resident, luminal Ca2+-buffering chaperones involved in the storage of Ca2+ and the regulation of the intracellular Ca2+ concentration ([Ca2+]i) [30, 31]. Their decreased expression levels suggest that the release of Ca2+ from the intracellular Ca2+ stores causes an elevation of the [Ca2+]i in ASM cells. ERp29 is a newly identified ER lumen-resident protein that lacks Ca2+ binding activities. In our study, decreased ERp29 expression was detected during the EAR, and this change in expression was validated by western blot. Although ERp29 cannot bind Ca2+, it may interact with Ca2+-binding molecular chaperones on the membrane of the mitochondrial sheath and thus may indirectly influence Ca2+ transport . S100A11 is a CaBP with an intermediate expression level in lung tissue and plays a key role in the regulation of enzymatic activity, cell growth, apoptosis and inflammation . In contrast to the proteomic study of a chronic mouse asthma model that demonstrated marked down-regulation of S100A11 , we observed an increased expression level of S100A11 during the EAR. However, the precise role of this protein in asthma remains unclear and needs further investigation.
It has long been established that an increased [Ca2+]i might account for the heightened ASM contractility, increased mucous gland secretion and elevated mast cell mediator secretion rate observed in asthma . Consequently, agonist-induced Ca2+ signaling and altered Ca2+ homeostasis have been regarded as possible therapeutic targets in the pathophysiology of asthma. It is highly plausible that the inhibition of Ca2+ mobilization into ASM cells could effectively reverse acute airway obstruction. Based on the results presented in this study, Ca2+ and its role in asthma should be examined in more detail. Compared with Ca2+ mobilization, the binding of Ca2+ and the downstream biological events induced by the interaction between CaBPs and effector proteins may play a more crucial role in the progression of asthma. Further studies on Ca2+ binding and its effects will help determine whether CaBPs can be used as novel drug targets for the treatment of asthma.
Mitochondrial activity during the EAR
Mitochondria have a critical role in ATP production and are sometimes described as "cellular power plants" . In addition to their bioenergetic function, mitochondria have been increasingly recognized as key players in cellular regulatory systems including Ca2+ handling and apoptosis, as well as numerous other catabolic and anabolic pathways [37, 38]. Accumulating clinical and experimental evidence has suggested a possible role for mitochondrial activity in the pathogenesis of asthma. In asthmatic ASM cells, there was a higher basal energy turnover due to the increased number and activity of mitochondria . Similarly, Ca2+-dependent enhanced mitochondrial biogenesis has been demonstrated in the bronchial smooth muscle of asthmatic patients, and this was causatively linked to airway remodeling .
In our study, seven of the identified proteins were enriched in the GO class "mitochondrion" (Figure 4). Among them was Atp5a1, which is a well-characterized mitochondrial protein found in the mitochondrial inner membrane . It is well known that Atp5a1 is an important, enzymatically active member of the F0-F1 mitochondrial ATP synthase (Complex V). This complex is the final electron acceptor in the mitochondrial electron transport chain necessary for the generation of ATP. The enhanced expression of Atp5a1 further illustrates the energetic adaptations in the ASM with increased contractility during the EAR. Glyceraldehyde-3-phosphate dehydrogenase and pyruvate kinase are also mitochondria-localized proteins that were up-regulated in the lung proteome of asthmatic rats. Previous evidence has shown that these glycolytic enzymes can be attached to the outside of mitochondria, where they funnel pyruvate directly into the citric acid cycle in response to cellular energy demands [42, 43].
To further investigate whether these mitochondrial proteins are linked to the relative mitochondrial abundance, we examined the mRNA expression pattern of VDAC1, a mitochondrial protein localized to the outer mitochondrial membrane that is commonly used to assess the mitochondrial mass and activity in a specific sample . The significantly up-regulated mRNA level of VDAC1 in the asthmatic group further indicates the elevated biological activity of mitochondria during the EAR. Our findings suggest that mitochondria may represent a potential target for the treatment of asthma in the early phase. Further studies are required to determine the exact functional significance of mitochondria in asthma and assess whether drugs interfering with mitochondrial activity can prevent and/or reverse asthma progression.
In general, the contractility of ASM during the EAR requires an elevation in the [Ca2+]i. Mitochondria can transiently store Ca2+, and together with the ER, can function as the main source of the Ca2+ that is released to increase the [Ca2+]i . In addition to initiating ASM contraction by binding with calmodulin, the increased [Ca2+]i could facilitate the binding of Ca2+ to Ca2+ signaling proteins, such as the S100 proteins. This binding would, in turn, allow their interaction with a wide spectrum of effector proteins to activate Ca2+ signaling pathways in ASM cells. Increased glycolysis and mitochondrial activity during the EAR would ensure an adequate energy supply necessary for ASM contraction, Ca2+ binding, transport and the transduction of Ca2+ signaling under hypoxic conditions through an interactive process. Taken together, a multifaceted picture emerges from our proteomic study. It suggests key roles for cellular energy adaptation and the propagation of Ca2+ signaling during the EAR in which Ca2+ binding may play a central role to promote the progression of asthma.
In this study, we used a 2-DE/MS-based proteomic approach to examine the lung protein profile of asthmatic rats during the EAR. A comparison of the asthmatic rats with the normal controls revealed differences in the protein expression pattern that were highlighted by the gene ontology classification, the PPI interaction networking and the biological pathway exploration. Our results indicate that the allergen-induced EAR is associated with glycolysis, Ca2+ binding and mitochondrial activity, which could establish a functional network with Ca2+ binding as the central player to promote the progression of asthma. These findings may provide new clues important for to the early recognition and treatment of asthma.
This work was funded by the National Natural Science Foundation of China (No. 30873299, 90409014, 30701123) and the Shanghai Leading Academic Discipline Project (S30304). The authors thank Zai-Yong Wang, Jing Sun, and Yong-Jun Peng for their excellent technical assistance, as well as Professor Nian-Qing Ding for helpful advices in the preparation of this manuscript.
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