Effect of methylene blue on the genomic response to reperfusion injury induced by cardiac arrest and cardiopulmonary resuscitation in porcine brain
© Martijn and Wiklund; licensee BioMed Central Ltd. 2010
Received: 15 February 2010
Accepted: 1 July 2010
Published: 1 July 2010
Cerebral ischemia/reperfusion injury is a common secondary effect of cardiac arrest which is largely responsible for postresuscitative mortality. Therefore development of therapies which restore and protect the brain function after cardiac arrest is essential. Methylene blue (MB) has been experimentally proven neuroprotective in a porcine model of global ischemia-reperfusion in experimental cardiac arrest. However, no comprehensive analyses have been conducted at gene expression level.
Pigs underwent either untreated cardiac arrest (CA) or CA with subsequent cardiopulmonary resuscitation (CPR) accompanied with an infusion of saline or an infusion of saline with MB. Genome-wide transcriptional profiling using the Affymetrix porcine microarray was performed to 1) gain understanding of delayed neuronal death initiation in porcine brain during ischemia and after 30, 60 and 180 min following reperfusion, and 2) identify the mechanisms behind the neuroprotective effect of MB after ischemic injury (at 30, 60 and 180 min).
Our results show that restoration of spontaneous circulation (ROSC) induces major transcriptional changes related to stress response, inflammation, apoptosis and even cytoprotection. In contrast, the untreated ischemic and anoxic insult affected only few genes mainly involved in intra-/extracellular ionic balance. Furthermore, our data show that the neuroprotective role of MB is diverse and fulfilled by regulation of the expression of soluble guanylate cyclase and biological processes accountable for inhibition of apoptosis, modulation of stress response, neurogenesis and neuroprotection.
Our results support that MB could be a valuable intervention and should be investigated as a therapeutic agent against neural damage associated with I/R injury induced by cardiac arrest.
Despite recent advances in out-of-hospital cardiac arrest (CA) resuscitation, hypoxic-ischemic brain damage still causes considerable mortality and morbidity. Of the patients who survive to discharge, only 20% or fewer will have good neurologic function at the end of 1 year  After successful CPR and restoration of spontaneous circulation (ROSC) neuronal death initiated by ischemia during CA is increased also during reperfusion leading to secondary postischemic-anoxic encephalopathy , part of the so-called postresuscitation syndrome [3, 4]. Cerebral recovery is dependent on duration of arrest and cardiopulmonary resuscitation (CPR), and numerous factors related to basic, advanced, and prolonged life support [5, 6]. Except for the use of mild hypothermia after ventricular fibrillation cardiac arrest, currently recommended therapy in the 2005 guidelines of the European Resuscitation Council , clinical neuroprotection practice rests solely on extrapolation from animal experimental work or weak clinical studies. In recent years, especially in critical care research, swine have increasingly been employed because they share similar cardiovascular and physiologic properties with humans [9, 10]. Furthermore, porcine brains, like human, are gyrencephalic which make them closely related to the human brain in structure and function. Accordingly, the response of pigs to disease and treatment are often comparable to that of human  and data concerning pig brain anatomy and neurochemistry have increased considerably in recent years [12, 13].
Safety/FDA approved methylene Blue (MB), a cationic thiazine dye with a low toxicity profile at low doses, is efficiently trapped in the brain and its concentration is over 10 times higher in the brain than in the circulation one hour after systemic administration , indicating a rapid and extensive accumulation in the nervous system. MB has been used as a neuroprotective agent in drug-induced encephalopathy, dementia and manic-depressive psychosis [15–17]. Furthermore, MB exhibits promising cardio- and neuroprotective properties in experimental cardiac arrest [18, 19] and is effective in both attenuating ischemia-reperfusion (I/R) syndrome  and increasing short-term survival after resuscitation from cardiac arrest .
In order to gain further understanding of the mechanisms behind the neuroprotective effects of MB, we conducted a microarray analysis of the changes in gene expression in the ischemic brain in our pig model of experimental cardiac arrest and subsequent ischemia-reperfusion injury.
Animal treatment and experimental procedures were approved by the Uppsala Institutional Review Board for Animal Experimentation. The piglets were handled according to the guidelines of the Swedish National Board for Laboratory Animals and the European Convention of Animal Care. Anaesthesia was used in all surgical interventions.
Experiments were performed on 30 piglets of Swedish triple breed of both sexes aged 12-14 weeks and with a mean weight of 25.8 kg ± 1.3 kg.
Cardiac arrest model
Total RNA was extracted using RNeasy Lipid Tissue kit (Qiagen)according to the manufacturer's instructions. Contaminating genomic DNA was removed during RNA purification by addition of an on-column DNase digestion step with RNase-Free Dnase I (Qiagen). RNA quality was verified on an Agilent 2100 Bioanalyzer (Agilent).
Affymetrix gene profiling and microarray analysis
Total RNA (10 μg) was first converted to double-stranded cDNA (One-cycle cDNA synthesis kit, Affymetrix UK Ltd) and then to biotinylated cRNA (IVT labelling kit, Affymetrix UK Ltd) as described in the One-cycle Target Labelling protocol (Affymetrix UK Ltd). After fragmentation and quality confirmation (Agilent 2100 Bioanalyzer), 10 μg of the biotinylated cRNA were hybridized for 16 hours to an Affymetrix GeneChip Porcine Genome Array. The array was then washed and stained with streptavidin-phycoerythrin solution using the Fluidics Station 450 (Affymetrix UK Ltd.) before it was scanned using the Affymetrix GeneChip Scanner 3000. Data were normalized and comparative analysis results were obtained from Affymetrix GeneChip Operating Software (GCOS v1.4; Affymetrix UK Ltd). The results were deposited to GEO database under accession number GSE22165. Statistical analysis was performed using the Significance Analysis of Microarrays (SAM) statistics program to determine genes that were significantly regulated at each time point . SAM uses a permutation method to determine the significance of changes in expression by assimilating a set of gene-specific t-tests and hence reports a false-discovery rate (FDR) rather than a probability. Data query, mining, filtering and sorting as well as hierarchical cluster analysis and principle component analysis (PCA) were performed using Spotfire DecisionSite® for Functional Genomics software (Tibco-Spotfire Inc., Cambridge, MA, USA).
Gene filtering and selection
In a first step, after normalization, results from the GeneChip Operating Software (GCOS) were considered. Genes with raw intensity values that did not meet a minimum threshold (more than 30 in at least one of the samples) or described as absent in all 30 samples were excluded from the results. The selected probe sets were then submitted to statistical analysis to identify significant changes in gene expression. Pair-wise comparison analysis based on GCOS statistical algorithm was carried out to compare animals of the experimental group to each animal of the corresponding control group. The group means were also compared using the SAM software. By combining these 2 approaches, we obtained a list of modulated genes for each condition. The stringent criteria for the lists of genes were that the FDR values obtained with the SAM software were inferior to 5% and there were 9 significant change calls generated by GCOS. Furthermore, the lists of genes were restricted to include only genes for which expression changes were ≥ ± 1.5-fold. Changes which occurred 5, 20 or 30 min after cardiac arrest or 30, 60 or 180 min after ROSC were analyzed using the Ca0 as control group. Changes after 30, 60 or 180 min of MB treatment following ROSC were analyzed using the Rosc30, Rosc60 and Rosc180 as control groups, respectively.
Confirmatory Real-Time PCR analysis
Data generated from microarrays were confirmed using real-time PCR (qPCR).
Sequences of primers used for qRT-PCR
Primer sequence (5'->3')
Similar to dusp1
Similar to ddit4
Similar to gadd45b
Similar to ddit3
Similar to nfil3
Similar to set
Similar to dhcr24
All experiments were performed in triplicates for every sample and contained negative controls. Results were evaluated by MyiQ single-colour Real-time PCR detection system software (Bio-Rad Laboratories, USA). The expression levels for Hsp22, Hsp27, Hsp40, Hsp70, Hsp72, Hsp90, rgs2, cart, ndrg2 as well genes similar to dusp1, ddit3, gadd45b, nfil3, set and dhcr24 mRNA transcripts were described as the ratios of the targets normalized to the endogenous reference (sdha) and then the ratios for fold change relative to the calibrator were obtained. The calibrator was constituted from brain samples of piglets belonging to the Ca0 group.
The Affymetrix porcine genome microarray is minimally annotated. Approximately 11% of the probe sets on this array are described with gene names, posing a challenge to biological interpretation of data. Lack of annotation is likely due to the limited availability of full-length porcine cDNA sequence. To gain further information about the identity and/or function of the selected sequences which were not associated to a protein name, BLAST sequence-similarity searches were performed. After careful verification of the resulting alignments, probe sets sharing sequence similarity with known proteins from other species were annotated as "similar to". To avoid redundancy, only gene symbols are mentioned in the text while full names are used in the figures and tables. Furthermore genes annotated "similar to" will be considered as sharing the same function as the gene they were associated with.
Gene expression profiles after untreated CA
Differentially expressed genes after 5 min (Ca5), 20 min (Ca20) and 30 min (ca30) of untreated CA
similar to ZCCHC12, Zinc finger CCHC domain-containing protein 12
similar to RPS6KA5 ribosomal protein S6 kinase alpha-5
similar to homeobox protein PBX3, Pre-B-cell leukemia transcription factor 3.
HTR2C, 5-hydroxytryptamine (serotonin) receptor 2C
TTR, Transthyretin (Prealbumin)
similar to NNAT, neuronatin
similar to DPP10, inactive dipeptidyl peptidase 10
similar to SLC30A9, solute carrier family 30 member 9
similar to SLC30A10, solute carrier family 30 member 10
similar to GNAL guanine nucleotide-binding protein G(olf) subunit alpha
similar to NECAB1, Neuronal calcium-binding protein 1
similar to RCAN3 regulator of calcineurin 3 (calcipressin-3)
similar to HSPA13, Heat shock 70 kDa protein 13 (stress 70 protein chaperone microsome-associated 60 kDa protein)
similar to MAPT, microtubule-associated protein tau
Nucleic acid metabolism
similar to AK3, GTP:AMP phosphotransferase mitochondrial (adenylate kinase 3)
similar to protein FAM14A
similar to CPSF7, cleavage and polyadenylation specificity factor 7
similar to PIK3R1, phosphatidylinositol 3-kinase p85 regulatory subunit alpha
similar to RASSF2, Ras association domain-containing protein 2
similar to PITRM1, pitrilysin metalloproteinase 1
PYGM, Glycogen phosphorylase
IgG, Immunoglobulin G, heavy chain
Gene expression profiles after ROSC
Transcriptional changes for Rosc 30, 60 and 180 were analyzed using Ca0 as baseline. For changes specifically induced by MB treatment, MB30, 60 and 180 groups were compared to their corresponding ROSC (with saline) controls i.e. Rosc 30, 60 and 180, respectively. After gene filtering, we obtained a final list of 518 probe sets showing significant changes of expression after either ROSC or MB treatment. Manual annotations gave a total of 317 probe sets (61%) similar to a known protein, 80 (16%) identified genes and 121 (23%) lacking any sequence similarity in any database and therefore called "unknown" (for a detailed list see Additional file 1).
Replication of gene expression profiles by RT-qPCR
Effects of cardiac arrest/global ischemia
Interruption of blood flow after CA limits the delivery of oxygen and glucose to neurons causing ATP reduction which has numerous consequences including neurotoxicity, DNA damage, and production of free radicals . In our model, we found only 28 significantly differentially expressed transcripts in total after global ischemia. Among the moderately up-regulated genes, it is noteworthy that 7 transcripts affected by ischemia belonged to ion transport and calcium signalling functions as it is well known that one of the first consequences of ischemia-induced apoptosis is a disruption of ionic gradients across membranes with increase in extracellular potassium and influx of sodium, chloride and calcium into the cells. Interestingly our list included 2 zinc transporters: SLC30A9 (ZNT9) and SLC30A10 (ZNT10). These findings are in line with an earlier study showing that another member of the SLC30 family, ZNT1, was induced after transient forebrain ischemia in the Gerbil . The SLC30 proteins are CDF (cation diffusion facilitatator) proteins and plasma membrane efflux transporters . The mechanism of transport for many CDF proteins appears to be via zinc/H + or K + antiports. Therefore, despite their name, CDF proteins do not serve as diffusion facilitators but rather as secondary active transporters, using the gradient of other ions to drive the transport of zinc . Identification of ZNT9 and ZNT10 as ischemia-induced genes adds therefore to the growing evidence suggesting that the role of zinc efflux transporters in cellular zinc homeostasis may be particularly important in postischemic neuronal death where high levels of zinc are accumulated by neurons .
Effects of ROSC/reperfusion
Cardiac arrest and CPR elicit global brain ischemia and reperfusion causing immediate and delayed cell death. I/R injury results in oxidative stress leading to further generation of free radicals. This in turn activates numerous major signalling pathways, in particular through changes in gene expression which influence the survival or death of the cells.
The use of microarrays has been applied to study the effects of permanent or transient ischemia on total brain or distinct regions in rodent models but, to our knowledge, this is the first time that a genome-wide transcript profiling study is undertaken in porcine brain to study the effect of I/R. Our results showed that 141 genes were induced and only 39 were repressed after ROSC. Such an imbalance between up- and down-regulated genes could be due to a technical bias. Yet it is in agreement with a recent report where the authors monitored the genomic response to global ischemia and reperfusion in the rat brain and concluded that the ischemia/reperfusion response of the rat brain is therefore an active process . A functional analysis of the clusters revealed that apoptosis/programmed cell death and stress response (34% of all induced genes) were overrepresented among the genes up-regulated after ROSC. Among them we found proteins belonging to the caspase-dependent apoptotic pathway, p53 and mitogen-activated protein kinase pathways, playing a pivotal role in stress and apoptosis. Consistent with findings in rodent, heat shock proteins are among the most prominently upregulated genes after the ischemic insult [29, 30]. Overall our gene lists are in line with previous microarray studies monitoring cerebral ischemic insult [28–34] including proteins such as ICAM-1, a main actor for the regulation of ischemia-induced injury since its inhibition induces neuroprotection after I/R injury [35, 36]; VEGFA as a main indicator for brain ischemia ; IFRD1, an early gene stimulating p53 and up-regulating iNOS after oxidative stress ; inducible HMOX1 and constitutive HMOX2, two rate-limiting enzymes for the catabolism of the prooxidant heme [39, 40] and CHOP. a main marker of ER stress [41, 42].
Effects of MB treatment
One of the responses to cerebral ischemia is an increase in the production of NO, catalyzed by nitric oxide synthase (NOS) expression. There has been increasing evidence that neuronal nitric oxide synthase (nNOS)-induced NO is an important mediator in ischemic brain injury . Methylene blue (MB) exerts an antioxidant effect by binding and inactivating the action of NO , blocking the soluble guanylate cyclase  - the primary receptor for NO - as well as inhibiting Nitric Oxide Synthase (NOS) . Although transcriptional levels of NOS did not show any changes after treatment by MB in our study, we have previously reported that NOS enzymes were regulated by MB at the protein level, in porcine brain, already after 30 min (Miclescu et al., submitted). These results concur with the conclusion that NOS enzymes are preferentially regulated post-transcriptionally, thus allowing a more rapid adaptation of the enzyme activity to cellular stress variations . As could be expected, we identified the sGC transcript in the set of genes regulated by MB together with HSP90, a chaperone forming a complex with both sGC and endothelial nitric oxide synthase (eNOS) for the modulation of NO production . Although the modulation of cGMP/NO pathway is considered the most significant effect of MB, recent studies indicate that it has multiple cellular and molecular targets.
Inhibition of apoptosis
A number of anti-apoptotic genes were found stimulated by MB. Some of them exert their effect via inhibition of caspases: DHCR24 (seladin-1), which protects cells from oxidative stress by reducing caspase 3 activity [49, 50]; PIP5K1, decreasing activated caspases ; ELAVL4, an actor in both neuron-specific RNA processing (for example protecting p21 mRNA from decay) and inhibition of mitochondria-dependent apoptosis [52, 53]. Others were identified as antagonists of the MAPK/p53 apoptotic pathways: RND3, a pro-survival p53 target gene that inhibits ROCK I-mediated apoptosis in response to stress and participates to neurite extension ; CSDE1, which decreases p53/GADD45g/caspase3 transcription ; DDB1, a pro-survival p53 target involved in protein degradation ; DUSP6, a MAPK phosphatase which inactivates ERK ; YWHAZ, which supports cell survival by antagonizing apoptotic proteins and has a neuroprotective role as p38 MAPK inhibitor [58, 59]; as well as CAMK4, a key protein involved in oxidative stress which promotes neuronal survival and inhibits apoptosis . Although the anti-apoptotic effect of MB appeared to be mostly caused by stimulation of specific transcripts, the repression of the following genes participated to the overall protective effect of MB: SMARCA4, a chromatin remodelling factor and an apoptotic p53 target ; NEO which acquires its pro-apoptotic activity when cleaved by caspases ; TMEM49, a stress-induced protein that promotes formation of intracellular vacuoles involved in autophagy ; SET (I2PP2A) mediating neuronal apoptosis ; SLC25A6 which participates in the formation of the permeability transition pore complex (PTPC) responsible for the release of mitochondrial signals ; and SAFB, an apoptosis marker .
Upon reperfusion after even a short period of transient global cerebral ischemia, protein synthesis is severely suppressed [67, 68]. Ischemia-induced suppression of protein synthesis, which is initiated by activation of kinases phosphorylating the initiation factor 2 (eIF2a), has been attributed to ER dysfunction . Our results showed that eIF2AK2 (PKR) one of the kinases that specifically phosphorylates eIF2a and therefore inhibits translation , was repressed by MB together with EDEM3, a protein enhancing the ER-associated degradation (ERAD) . In addition, DNAJB9, an ER chaperone suppressing cell death and induced by ER stress  was also induced by MB. These results suggest a potential counteracting effect of MB on the shutdown of translation by ER stress.
Disruption of the cytoskeleton induced by apoptosis causes a depolymerization of microtubules followed by Golgi fragmentation and secretory membrane traffic arrest [73, 74]. In the Golgi network, proteins are sorted and segregated into transport vesicles to be targeted to subcellular compartments or released such as neurotransmitters. Our observations suggested that vesicle trafficking might be affected by MB since proteins which mediate transport between ER and Golgi such as SEC22b, STX5, KDELR2 and ERGIC1 [75, 76, 78] and VPS16 and GGA3 between Golgi and the endosomes [79, 80] were up-regulated. On the other hand, proteins such as: VAMP3, a vesicle-associated membrane protein involved in regulating membrane traffic; AP1S2, modulating the dynamics of the cytoskeleton ; and GOSR2 involved in transport of proteins from the cis/medial-Golgi to the trans-Golgi network ; were down-regulated by MB.
Microtubules, a major component of the cytoskeleton which is damaged by ischemia, are crucial for intracellular transport and neurogenesis/neural regeneration. For example, the principle mechanisms involved in neurite extension and axonal pathfinding rely upon the reorganization of cytoskeletal elements induced by microtubule-associated proteins (MAPs) . Our results showed changes in a number of microtubule-related proteins induced by MB: GABARAPL1 and MAP1B, two members of the MAP family; EXOC5 mediating the targeting of post-Golgi secretory vesicles and stimulating neurite outgrowth ; NIPA1 regulating synaptic growth and axonal microtubules ; INA, an intermediate filament protein involved in the morphogenesis of neurons; CAMK4 and SEMA6A, both involved in regulation of microtubule dynamics [85–87]; and SEPT11, which regulates microtubule stability through interaction with MAP4 . In contrast, 2 microtubule subunits, the kinesins KIF5A and KLC1, were inhibited by MB. In addition to stimulation of the microtubule networks, MB induced proteins important for brain repair or regeneration such as: BASP1, TM4SF1, NT, SMARCA1 and RND3, which all promote neurite outgrowth [54, 89–92]; RUFY3, a pro-survival gene implicated in the formation of a single axon in developing neurons ; GMFB which stimulates neural regeneration; SC4MOL, involved in brain repair ; CASK which plays a role in synaptogenesis ; as well as PAFAH1B2, DAB1 and PREX1 involved in brain cell migration [96–98]. The effect of MB on neurogenesis included also the inhibition of OLIG2, a repressor of neurogenesis  and two axon-guidance regulating proteins, NEO and NFIA [62, 100].
MB induced genes known to have a neuroprotective effect such as: CX43, the primary component protein in astrocytic gap junctions playing multiple roles in the mitigation of apoptotic neuronal damage in cerebral ischemia[101, 102];. THBD, which activates the anti-inflammatory and cytoprotective activated protein C (APC) thus leading to promotion of neovascularization and neurogenesis in the post-ischemic brain ; AQP4, a neuroprotective water-specific channel, osmoreceptor regulating water flow in central nervous system [104, 105]; and CART, an intriguing peptide which protects brain from damage both through ERK activation in ischemic stroke  and potential preservation of mitochondrial function and prevention of energy failure after I/R injury .
All these findings suggest that MB exerts neuroprotection by regulation of the expression of soluble guanylate cyclase and diverse biological processes from inhibition of apoptosis and reversal of the shutdown of translation to restoration of functional cellular trafficking and activation of brain repair/regeneration genes as well as induction of critical neuroprotective proteins. Therefore they support that MB could be a valuable intervention and should be investigated as a therapeutic agent against neural damage associated with I/R injury induced by cardiac arrest.
This study was supported by The Laerdal Foundation for Acute Medicine.
We are grateful to the core facility for Bioinformatics and Expression Analysis (BEA, Karolinska Institute) and to the Uppsala Array Platform for kindly allowing us to run our microarrays using their Affymetrix systems.
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