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1.  The Breakdown of Preformed Peritoneal Advanced Glycation End Products by Intraperitoneal Alagebrium 
Journal of Korean Medical Science  2009;24(Suppl 1):S189-S194.
It has been demonstrated that inhibitors of advanced glycation end products (AGE), such as aminoguanidine, can suppress peritoneal AGE in rats on peritoneal dialysis (PD). However, it is unknown whether late administration of a putative cross-link breaker, alagebrium, could reverse peritoneal AGE. We therefore compared alagebrium with aminoguanidine in their ability to reverse peritoneal AGE in rats on PD. Male Sprague-Dawley rats were randomly divided into 3 groups: group I dialyzed with 4.25% glucose solution for all exchanges; group II dialyzed with 4.25% glucose solution containing aminoguanidine, and group III dialyzed with 4.25% glucose solution containing alagebrium for last 8 weeks of 12-week dialysis period. Dialysis exchanges were performed 2 times a day for 12 weeks. Immunohistochemistry was performed using a monoclonal anti-AGE antibody. One-hour PET was performed for comparison of transport characteristics. The immunolabelling of AGE in peritoneal membrane was markedly decreased in the alagebrium group. Consistent with this, the alagebrium group exhibited significantly higher D/Do glucose and lower D/P urea, suggesting low peritoneal membrane transport. But there were no significant differences between the control and the aminoguanidine group. These results suggest that the alagebrium may be the optimal therapeutic approach, compared with treatment with inhibitors of AGE formation, in rats on PD.
PMCID: PMC2633188  PMID: 19194551
Advanced Glycation End Products; Aminoguanidine; Alagebrium; Peritoneal Dialysis
2.  Relapsing Peritonitis Caused by Bordetella bronchiseptica in Continuous Ambulatory Peritoneal Dialysis Patient: A Case Report 
Journal of Korean Medical Science  2009;24(Suppl 1):S215-S218.
Bordetella (B) bronchiseptica is a common veterinary pathogen, but has rarely been implicated in human infections. Most patients with B. bronchiseptica infections are compromised clinically such as in patients with a malignancy, AIDS, malnutrition, or chronic renal failure. We experienced a case of relapsing peritonitis caused by B. bronchiseptica associated with continuous ambulatory peritoneal dialysis (CAPD). A 56-yr-old male, treated with CAPD due to end stage renal disease (ESRD), was admitted with complaints of abdominal pain and a turbid peritoneal dialysate. The culture of peritoneal dialysate identified B. bronchiseptica. The patient was treated with a combination of intraperitoneal antibiotics. There were two further episodes of relapsing peritonitis, although the organism was sensitive to the used antibiotics. Finally, the indwelling CAPD catheter was removed and the patient was started on hemodialysis. This is the first report of a B. bronchiseptica human infection in the Korean literature.
PMCID: PMC2633208  PMID: 19194556
Bordetella Bronchiseptica; Peritonitis; Peritoneal Dialysis, Continuous Ambulatory
3.  Dihydroavenanthramide D prevents UV-irradiated generation of reactive oxygen species and expression of matrix metalloproteinase-1 and -3 in human dermal fibroblasts 
Experimental Dermatology  2013;22(11):759-761.
Ultraviolet B (UVB) radiation induces photoageing by upregulating the expression of matrix metalloproteinases (MMPs) in human skin cells. Dihydroavenanthramide D (DHAvD) is a synthetic analog to naturally occurring avenanthramide, which is the active component in oats. Although anti-inflammatory, anti-atherosclerotic and antioxidant effects have been reported, the antiphotoageing effects of DHAvD are yet to be understood. In this study, we investigated the inhibitory effects of DHAvD on UVB-induced production of reactive oxygen species (ROS) and expression of MMPs, and its molecular mechanism in UVB-irradiated human dermal fibroblasts. Western blot and real-time PCR analyses revealed that DHAvD inhibited UVB-induced MMP-1 and MMP-3 expression. It also significantly blocked UVB-induced ROS generation in fibroblasts. Additionally, DHAvD attenuated UVB-induced phosphorylation of MAPKs, activation of NF-κB and AP-1. DHAvD regulates UVB-irradiated MMP expression by inhibiting ROS-mediated MAPK/NF-κB and AP-1 activation. DHAvD may be a useful candidate for preventing UV light-induced skin photoageing.
PMCID: PMC4251632  PMID: 24103002
4.  Two Cases of Subarachnoid Hemorrhage from Spontaneous Anterior Cerebral Artery Dissection : A Case of Simultaneous Hemorrhage and Ischemia Without Aneurysmal Formation and Another Case of Hemorrhage with Aneurysmal Formation 
Spontaneous anterior cerebral artery (ACA) dissection, although extremely rare, is often associated with severe morbidity and mortality. It could lead to cerebral hemorrhage, ischemic stroke, or, rarely, combination of hemorrhage and ischemia due to hemodynamic changes. Prompt and accurate diagnosis is essential for determining the appropriate management. However, the optimal treatment for ACA dissection remains controversial. Herein, we report on two rare cases of subarachnoid hemorrhage (SAH) caused by ACA dissection; a case presenting with simultaneous SAH and infarction without aneurysmal formation and another case presenting with SAH with fusiform aneurysmal formation. A review of the related literature is provided, and optimal treatments for each type of dissection are suggested.
PMCID: PMC4102751  PMID: 25045652
Anterior cerebral artery; Dissection; Infarction; Subarachnoid hemorrhage
5.  Synergistic Effect between Cryptotanshinone and Antibiotics against Clinic Methicillin and Vancomycin-Resistant Staphylococcus aureus 
Cryptotanshinone (CT), a major tanshinone of medicinal plant Salvia miltiorrhiza Bunge, demonstrated strong antibacterial activity against clinic isolated methicillin and vancomycin-resistant Staphylococcus aureus (MRSA and VRSA) in this experiment. The CT was determined against clinic isolated MRSA 1–16 with MIC and MBC values ranging from 4 to 32 and 8 to 128 μg/mL; for MSSA 1-2 from 16 to 32 μg/mL and 64 to 128 μg/mL; for VRSA 1-2 from 2 to 4 μg/mL and 4 to 16 μg/mL, respectively. The range of MIC50 and MIC90 of CT was 0.5–8 μg/mL and 4–64 μg/mL, respectively. The combination effects of CT with antibiotics were synergistic (FIC index <0.5) against most of tested clinic isolated MRSA, MSSA, and VRSA except additive, MRSA 4 and 16 in oxacillin, MRSA 6, 12, and 15 in ampicillin, and MRSA 6, 11, and 15 in vancomycin (FIC index < 0.75–1.0). Furthermore, a time-kill study showed that the growth of the tested bacteria was completely attenuated after 2–6 h of treatment with the 1/2 MIC of CT, regardless of whether it was administered alone or with ampicillin, oxacillin, or vancomycin. The results suggest that CT could be employed as a natural antibacterial agent against multidrug-resistant pathogens infection.
PMCID: PMC3982256  PMID: 24782909
6.  Toxic epidermal necrolysis induced by lamotrigine treatment in a child 
Korean Journal of Pediatrics  2014;57(3):153-156.
Toxic epidermal necrolysis is an unpredictable and severe adverse drug reaction. In toxic epidermal necrolysis, epidermal damage appears to result from keratinocyte apoptosis. This condition is triggered by many factors, principally drugs such as antiepileptic medications, antibiotics (particularly sulfonamide), nonsteroidal anti-inflammatory drugs, allopurinol, and nevirapine. Lamotrigine has been reported potentially cause serious cutaneous reactions, and concomitant use of valproic acid with lamotrigine significantly increases this risk. We describe a case of an 11-year-old girl with tic and major depressive disorders who developed toxic epidermal necrolysis after treatment with lamotrigine, and who was diagnosed both clinically and pathologically. Children are more susceptible to lamotrigine-induced rash than adults, and risk of serious rash can be lessened by strict adherence to dosing guidelines. Unfortunately, in our case, the patient was administered a higher dose than the required regimen. Therefore, clinicians should strictly adhere to the dose regimen when using lamotrigine, especially in children.
PMCID: PMC4000762  PMID: 24778698
Toxic epidermal necrolysis; Adverse drug reaction; Lamotrigine; Antiepileptic drug
7.  Characteristics of thyroid nodules in infant with congenital hypothyroidism 
Korean Journal of Pediatrics  2014;57(2):85-90.
This study aimed to assess the characteristics of thyroid nodules among infants diagnosed with congenital hypothyroidism.
A retrospective study of 660 infants (374 males, 286 females) diagnosed with congenital hypothyroidism was carried out at the Pediatric Endocrine Clinic in Soonchunhyang University Hospital, Korea, between May 2003 and February 2013. The average age at diagnosis was 1.16±1.68 months.
Of the 28 patients (4.2%) with thyroid nodules, 17 (2.6%) had cystic thyroid nodules and 11 (1.6%) had solid thyroid nodules. There were no significant differences in gender or age between congenital hypothyroidism patients who hadthyroid nodules and those who did not. All nodules were asymptomatic. The average age at diagnosis of congenital hypothyroidism with nodules was 1.42±1.39 months. All detected nodules measured less than 1 cm in diameter. Twenty-two of the 28 infants (78.6%) had only one nodule, while multiple nodules were found in 6 infants (21.4%). Of the 28 infants diagnosed with nodules, 16 underwent thyroid ultrasonography during follow-up and 8 of them (50%) showed no signs of nodules at thyroid ultrasonography.
The prevalence of thyroid nodules in infants with congenital hypothyroidism was 4.2%. Most thyroid nodules were small in size and benign, disappearing during follow-up observation. We therefore conclude that thyroid nodules in infants with congenital hypothyroidism can simply be observed and do not require direct treatment.
PMCID: PMC3965800  PMID: 24678333
Thyroid nodule; Congenital hypothyroidism; Ultrasonography; Infant
8.  Virmid: accurate detection of somatic mutations with sample impurity inference 
Genome Biology  2013;14(8):R90.
Detection of somatic variation using sequence from disease-control matched data sets is a critical first step. In many cases including cancer, however, it is hard to isolate pure disease tissue, and the impurity hinders accurate mutation analysis by disrupting overall allele frequencies. Here, we propose a new method, Virmid, that explicitly determines the level of impurity in the sample, and uses it for improved detection of somatic variation. Extensive tests on simulated and real sequencing data from breast cancer and hemimegalencephaly demonstrate the power of our model. A software implementation of our method is available at
PMCID: PMC4054681  PMID: 23987214
9.  Evolutionarily Assembled cis-Regulatory Module at a Human Ciliopathy Locus 
Science (New York, N.Y.)  2012;335(6071):966-969.
Neighboring genes are often coordinately expressed within cis-regulatory modules, but evidence that nonparalogous genes share functions in mammals is lacking. Here, we report that mutation of either TMEM138 or TMEM216 causes a phenotypically indistinguishable human ciliopathy, Joubert syndrome. Despite a lack of sequence homology, the genes are aligned in a head-to-tail configuration and joined by chromosomal rearrangement at the amphibian-to-reptile evolutionary transition. Expression of the two genes is mediated by a conserved regulatory element in the noncoding intergenic region. Coordinated expression is important for their interdependent cellular role in vesicular transport to primary cilia. Hence, during vertebrate evolution of genes involved in ciliogenesis, nonparalogous genes were arranged to a functional gene cluster with shared regulatory elements.
PMCID: PMC3671610  PMID: 22282472
10.  PKC phosphorylation regulates mGluR5 trafficking by enhancing binding of Siah-1A 
Glutamate is the major excitatory neurotransmitter in the mammalian CNS and acts on both ionotropic and metabotropic glutamate receptors (mGluRs). The mGluRs are widely distributed in the CNS and modulate a variety of neuronal processes including neurotransmitter release and ion channel function. In hippocampus and cortex, mGluR5 is highly expressed and plays an important role in the regulation of synaptic plasticity. CaM binding dynamically regulates mGluR5 surface expression; however, the mechanisms linking CaM to mGluR5 trafficking are not clear. Recent studies showed that CaM binding to mGluR7 regulates its trafficking in a phosphorylation-dependent manner by disrupting the binding of PICK1. The E3 ligase seven in absentia homolog (Siah)-1A binds to mGluR5 and competes with CaM binding making it an intriguing molecule to regulate phosphorylation-dependent trafficking of mGluR5. In the present study, we find that CaM competes with Siah-1A for mGluR5 binding in a phosphorylation-dependent manner in rat hippocampal neurons. Specifically, phosphorylation of mGluR5 S901 favors Siah-1A binding by displacing CaM. We identified critical residues regulating Siah-1A binding to mGluR5 and showed that binding is essential for the Siah-1A effects on mGluR5 trafficking. Siah-1A binding decreases mGluR5 surface expression and increases endosomal trafficking and lysosomal degradation of mGluR5. Thus CaM-regulated Siah-1A binding to mGluR5 dynamically regulates mGluR5 trafficking. These findings support a conserved role for CaM in regulating mGluR trafficking by PKC-dependent regulation of receptor binding proteins.
PMCID: PMC3532883  PMID: 23152621
11.  Comparative Analysis of the Mini-pterional and Supraorbital Keyhole Craniotomies for Unruptured Aneurysms with Numeric Measurements of Their Geometric Configurations 
Keyhole craniotomy is a modification of pterional craniotomy that allows for use of a minimally invasive approach toward cerebral aneurysms. Currently, mini-pterional (MPKC) and supraorbital keyhole craniotomies (SOKC) are commonly used. In this study, we measured and compared the geometric configurations of surgical exposure provided by MPKC and SOKC.
Nine patients underwent MPKC and four underwent SOKC. Their postoperative contrast-enhanced brain computed tomographic scans were evaluated. The transverse and longitudinal diameters and areas of exposure were measured. The locations of the anterior communicating artery, bifurcation of the middle cerebral artery (MCAB), and the internal carotid artery (ICA) terminal were identified, and the working angles and depths for these targets were measured.
No significant differences in the transverse diameters of exposure were observed between MPKC and SOKC. However, the longitudinal diameters and the areas were significantly larger, by 1.5 times in MPKC. MPKC provided larger operable working angles for the targets. The angles by MPKC, particularly for the MCAB, reached up to 1.9-fold of those by SOKC. Greater working depths were required in order to reach the targets by SOKC, and the differences were the greatest in the MCAB by 1.6-fold.
MPKC provides larger exposure than SOKC with a similar length of skin incision. MPKC allows for use of a direct transsylvian approach, and exposes the target in a wide working angle within a short distance. Despite some limitations in exposure, SOKC is suitable for a direct subfrontal approach, and provides a more anteromedial and basal view. MCAB and posteriorly directing ICA terminal aneurysms can be good candidates for MPKC.
PMCID: PMC3625819  PMID: 23593599
Cerebral aneurysm; Craniotomy; Minimally invasive; Mini-pterional; Supraorbital; Surgical exposure
12.  A Ruptured Aneurysm at the Infraoptic Azygous Anterior Cerebral Artery with the Contralateral Internal Carotid Artery Agenesis Treated by Y-stent Assisted Coil Embolization 
Infraoptic anterior cerebral artery (ACA) is an extremely rare congenital anomaly. This anomalous artery usually arises from the intradural internal carotid artery (ICA) near the level of the ophthalmic artery (OA) or rarely from the extradural ICA. This anomaly frequently harbors a cerebral aneurysm, and may involve other coexisting vascular anomalies. In the case of this anomaly, surgical treatment of the aneurysm at the proximal ACA or anterior communicating artery (ACoA) may sometimes be difficult, because the veiled proximal ACA by the optic nerve would make proximal control inconvenient and the vertical midline segment of the proximal ACA would frequently form a superiorly directing aneurysm with a relatively high position. We report on an extremely rare case of a ruptured aneurysm at the infraoptic azygous ACA, possibly having an extradural origin, accompanied by contralateral ICA agenesis, and also introduce a feasible method for treatment by Y-stent assisted coil embolization.
PMCID: PMC3491221  PMID: 23210054
Infraoptic; Anterior cerebral artery; Y-stent
13.  CEP41 is mutated in Joubert syndrome and is required for tubulin glutamylation at the cilium 
Nature Genetics  2012;44(2):193-199.
Tubulin glutamylation is a post-translational modification (PTM) occurring predominantly on ciliary axonemal tubulin and has been suggested to be important for ciliary function 1,2. However, its relationship to disorders of the primary cilium, termed ‘ciliopathies’, has not been explored. Here, in Joubert syndrome (JBTS) 3, we identify the JBTS15 locus and the responsible gene as CEP41, encoding a centrosomal protein of 41 KDa 4. We show that CEP41 is localized to the basal body/primary cilium, and regulates the ciliary entry of TTLL6, an evolutionarily conserved polyglutamylase enzyme 5. Depletion of CEP41 causes ciliopathy-related phenotypes in zebrafish and mouse, and induces cilia axonemal glutamylation defects. Our data identify loss of CEP41 as a cause of JBTS ciliopathy and highlight involvement of tubulin PTM in pathogenesis of the ciliopathy spectrum.
PMCID: PMC3267856  PMID: 22246503
14.  Mechanical Thrombolysis Using Coil in Acute Occlusion of Fenestrate M1 Segment 
A fenestrated middle cerebral artery (MCA) is a rare congenital anomaly, and is related to interference in the normal embryonic development of the MCA. Fenestrated MCA has been regarded to have no clinical significance other than a rare event of hemorrhage from associated aneurysm. However, the fenestration within the arterial trunk can be an obstacle against thrombus migration and may be associated with a major cerebral infarction. Moreover, the presence of this anomaly can be hardly detected prior to thrombolytic procedures, and emergent treatments are proceeded without any information of anatomical configurations. Therefore, the recanalization procedures would carry a high risk of intraprocedural complications. We report a rare case of MCA territory infarction from occlusion of fenestrated M1 segment, and also introduce a safe method of mechanical thrombolysis using coil.
PMCID: PMC3471262  PMID: 23210038
Cerebral infarction; Middle cerebral artery; Fenestration
15.  Mutations in TMEM216 perturb ciliogenesis and cause Joubert, Meckel and related syndromes 
Nature genetics  2010;42(7):619-625.
Joubert syndrome (JBTS), related disorders (JSRD) and Meckel syndrome (MKS) are ciliopathies. We now report that MKS2 and JBTS2 loci are allelic and due to mutations in TMEM216, encoding an uncharacterized tetraspan transmembrane protein. JBTS2 patients displayed frequent nephronophthisis and polydactytly, and two cases conformed to the Oro-Facio-Digital type VI phenotype, whereas skeletal dysplasia was common in MKS fetuses. A single p.R73L mutation was identified in all patients of Ashkenazi Jewish descent (n=10). TMEM216 localized to the base of primary cilia, and loss of TMEM216 in patient fibroblasts or following siRNA knockdown caused defective ciliogenesis and centrosomal docking, with concomitant hyperactivation of RhoA and Dishevelled. TMEM216 complexed with Meckelin, encoded by a gene also mutated in JSRD and MKS. Abrogation of tmem216 expression in zebrafish led to gastrulation defects that overlap with other ciliary morphants. The data implicate a new family of proteins in the ciliopathies, and further support allelism between ciliopathy disorders.
PMCID: PMC2894012  PMID: 20512146
16.  Identification and Characterization of Novel Polymorphisms in the Basal Promoter of the Human Transporter, MATE1 
Pharmacogenetics and genomics  2009;19(10):770-780.
Human multidrug and toxin extrusion member 1, MATE1 (SLC47A1), plays an important role in the renal and biliary excretion of endogenous and exogenous organic cations including many therapeutic drugs. In this study, we characterized the transcriptional effects of five polymorphic variants and six common haplotypes in the basal promoter region of MATE1 that were identified in 272 DNA samples from ethnically diverse U.S. populations. We measured luciferase activities of the six common promoter haplotypes of MATE1 using in vitro and in vivo reporter assays. Haplotypes that contain the most common variant (mean allele frequency in four ethnics: 0.322), g.−66T>C, showed a significant decrease in reporter activities compared to the reference. Two transcription factors, AP-1 and AP-2rep, were predicted to bind to the promoter in the region of g.−66T>C. Results from electrophoretic mobility shift assays showed that the g.−66T allele, exhibited greater binding to AP-1 than the g.−66C allele. AP-2rep inhibited the binding of AP-1 to the MATE1 basal promoter region, and the effect was considerably greater for the g.−66T>C. These data suggest that the reduced transcriptional activity of g.−66T>C results from a reduction in the binding potency of the transcriptional activator, AP-1, and an enhanced binding potency of the repressor, AP-2rep to the MATE1 basal promoter region. Consistent with the reporter assays, MATE1 mRNA expression levels were significantly lower in kidney samples from individuals who were homozygous or heterozygous for g.−66T>C in comparison to samples from individuals who were homozygous for the g.−66T allele. Our study suggests that the rate of transcription of MATE1 is regulated by AP-1 and AP-2rep and that a common promoter variant, g.−66T>C may affect the expression level of MATE1 in human kidney, and ultimately result in variation in drug disposition and response.
PMCID: PMC2976711  PMID: 19745787
MATE1; Haplotype; Promoter; AP-1; AP-2rep; Transcriptional activity; Pharmacogenomics; Membrane transporters; SLC47A1; Polymorphisms
17.  The role of primary cilia in neuronal function 
Neurobiology of disease  2010;38(2):167-172.
The “ciliopathies” are a newly defined group of disorders characterized by defects in the structure or function of the cellular primary cilium. Patients with these disorders display variably expressive fibrocystic renal disease, retinal blindness, polydactyly, obesity, and brain dysgenesis as well as neurocognitive impairments. Joubert syndrome is a ciliopathy defined by cerebellar vermis hypoplasia, oculomotor apraxia, intermittent hyperventilation, and mental retardation. Recent evidence suggests important roles for the primary cilium in mediating a host of extracellular signaling events such as morphogen, mitogen, homeostatic and polarity signals. Based upon the clinical features of ciliopathies and cilia mediated signaling pathways, the data support a role for the primary cilium in modulating neurogenesis, cell polarity, axonal guidance and possibly adult neuronal function.
PMCID: PMC2953617  PMID: 20097287
Ciliopathy; Joubert syndrome; Neuronal function; Primary cilia
18.  Microarray Analysis of Differentially Expressed Genes in the Brains of Tubby Mice 
The tubby mouse is characterized by progressive retinal and cochlear degeneration and late-onset obesity. These phenotypes are caused by a loss-of-function mutation in the tub gene and are shared with several human syndromes, suggesting the importance of tubby protein in central nervous system (CNS) functioning. Although evidence suggests that tubby may act as a transcription factor mediating G-protein coupled receptor (GPCR) signaling, any downstream gene regulated by tubby has yet to be identified. To explore potential target genes of tubby with region-specific transcription patterns in the brain, we performed a microarray analysis using the cerebral cortex and hypothalamus of tubby mice. We also validated the changes of gene expression level observed with the microarray analysis using real-time RT-PCR. We found that expression of erythroid differentiation factor 1 (Erdr1) and caspase 1 (Casp1) increased, while p21-activated kinase 1 (Pak1) and cholecystokinin 2 receptor (Cck2r) expression decreased in the cerebral cortex of tubby mice. In the hypothalamic region, Casp 1 was up-regulated and µ-crystallin (CRYM) was down-regulated. Based on the reported functions of the differentially expressed genes, these individual or grouped genes may account for the phenotype of tubby mice. We discussed how altered expression of genes in tubby mice might be understood as the underlying mechanism behind tubby phenotypes.
PMCID: PMC2766699  PMID: 19885003
Tubby; Microarray; Gene expression; Cerebral cortex; Hypothalamus
19.  Heparin Attenuates the Expression of TNFα-induced Cerebral Endothelial Cell Adhesion Molecule 
Heparin is a well-known anticoagulant widely used in various clinical settings. Interestingly, recent studies have indicated that heparin also has anti-inflammatory effects on neuroinflammation-related diseases, such as Alzheimer's disease and meningitis. However, the underlying mechanism of its actions remains unclear. In the present study, we examined the anti-inflammatory mechanism of heparin in cultured cerebral endothelial cells (CECs), and found that heparin inhibited the tumor necrosis factor α(TNFα)-induced and nuclear factor kappa B (NF-κB)-dependent expression of adhesion molecules, such as intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), which are crucial for inflammatory responses. Heparin selectively interfered with NF-κB DNA-binding activity in the nucleus, which is stimulated by TNFα. In addition, non-anticoagulant 2,3-O desulfated heparin (ODS) prevented NF-κB activation by TNFα, suggesting that the anti-inflammatory mechanism of heparin action in CECs lies in heparin's ability to inhibit the expression of cell adhesion molecules, as opposed to its anticoagulant actions.
PMCID: PMC2788641  PMID: 19967061
Heparin; NF-κB; ICAM-1; VCAM-1; Cerebral endothelial cells; Anti-inflammation

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