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Yamano Y, Muro Y, Takei R, Kataoka K, Kimura T, Fukuoka J, Akiyama M, Kondoh Y. Autoantibodies against tyrosyl-tRNA synthetase (anti-Ha antibodies). Autoimmun Rev 2023; 22:103403. [PMID: 37482366 DOI: 10.1016/j.autrev.2023.103403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 07/20/2023] [Accepted: 07/20/2023] [Indexed: 07/25/2023]
Affiliation(s)
- Yasuhiko Yamano
- Department of Respiratory Medicine and Allergy, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi 489-8642, Japan
| | - Yoshinao Muro
- Department of Dermatology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan.
| | - Reoto Takei
- Department of Respiratory Medicine and Allergy, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi 489-8642, Japan
| | - Kensuke Kataoka
- Department of Respiratory Medicine and Allergy, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi 489-8642, Japan
| | - Tomoki Kimura
- Department of Respiratory Medicine and Allergy, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi 489-8642, Japan
| | - Junya Fukuoka
- Department of Pathology, Nagasaki University Graduate School of Biomedical Sciences, 1-12-4 Sakamoto, Nagasaki, Nagasaki 852-8521, Japan
| | - Masashi Akiyama
- Department of Dermatology, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
| | - Yasuhiro Kondoh
- Department of Respiratory Medicine and Allergy, Tosei General Hospital, 160 Nishioiwake-cho, Seto, Aichi 489-8642, Japan
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Wang A, Song Z, Zhang X, Xiao L, Feng Y, Qi C, Zhang G, Bai J, Liu Y, Sun T, Meng F, Wang F. MARS1 mutations linked to familial trigeminal neuralgia via the integrated stress response. J Headache Pain 2023; 24:4. [PMID: 36641423 PMCID: PMC9840295 DOI: 10.1186/s10194-022-01537-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/23/2022] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND While new genetic analysis methods are widely used in the clinic, few researchers have focused on trigeminal neuralgia (TN) with familial clustering (≥ 2 TN patients in one kindred family). Previous literature suggests that familial trigeminal neuralgia (FTN) may be associated with inherited genetic factors. To date, few next-generation sequencing studies have been reported for FTN. This study investigated the pathogenic mechanism of FTN by using whole-exome sequencing (WES) technology, which may enhance our understanding of human TN pathophysiology. METHOD: We performed WES for 7 probands from families of FTN. Sanger sequencing was performed for two control groups (FTN family members group and nonfamilial TN subject group) to potentially identify new FTN-related gene mutations. In families where FTN probands carried potentially pathogenic gene mutations, the ribonucleic acid (RNA) of FTN probands and related family members, as well as nonfamilial TN patients were analysed by RNA sequencing (RNA-seq) to confirm differential gene expression. RESULTS Seven probands were derived from 3 Chinese families. WES and Sanger sequencing identified MARS1 mutation c.2398C > A p.(Pro800Thr) in Family 1. MARS1 mutation was confirmed in 14/26 [53.8%] members of Family 1 in FTN family member group, while none of nonfamilial TN subjects had this MARS1 mutation. RNA-seq showed that 3 probands in Family 1 had higher expression of Fosl1 (Fos-like antigen 1) and NFE2 (Nuclear factor, erythroid 2) than 3 subjects in the nonfamilial TN subject group. Fosl1 and NFE2 are genes related to integrated stress response (ISR). CONCLUSION MARS1 mutations may cause chronic activation of ISR, contribute to ISR pathophysiological changes in FTN, and cause/accelerate peripheral nerve degeneration. The findings of this study can enrich our knowledge of the role of molecular genetics in TN in humans.
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Affiliation(s)
- Anni Wang
- grid.411617.40000 0004 0642 1244Beijing Neurosurgical Institute, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China ,grid.411617.40000 0004 0642 1244Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China ,grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China
| | - Zimu Song
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China
| | - Xu Zhang
- grid.216938.70000 0000 9878 7032School of Medicine, Nankai University, Tianjin, People’s Republic of China
| | - LiFei Xiao
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China ,grid.412194.b0000 0004 1761 9803China Ningxia Key Laboratory of Cerebrocranial Disease, The Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, People’s Republic of China
| | - Yan Feng
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China ,grid.412194.b0000 0004 1761 9803China Ningxia Key Laboratory of Cerebrocranial Disease, The Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, People’s Republic of China
| | - Chong Qi
- grid.411617.40000 0004 0642 1244Beijing Neurosurgical Institute, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China
| | - Guohuan Zhang
- grid.419052.b0000 0004 0467 2189State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, People’s Republic of China ,grid.410726.60000 0004 1797 8419Sino-Danish College, University of Chinese Academy of Science, Beijing, People’s Republic of China
| | - Jinbo Bai
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China ,grid.412194.b0000 0004 1761 9803China Ningxia Key Laboratory of Cerebrocranial Disease, The Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, People’s Republic of China
| | - Yang Liu
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China ,grid.412194.b0000 0004 1761 9803China Ningxia Key Laboratory of Cerebrocranial Disease, The Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, People’s Republic of China
| | - Tao Sun
- grid.413385.80000 0004 1799 1445Department of Neurosurgery, General Hospital of Ningxia Medical University, Yinchuan, Ningxia People’s Republic of China ,grid.412194.b0000 0004 1761 9803China Ningxia Key Laboratory of Cerebrocranial Disease, The Incubation Base of National Key Laboratory, Ningxia Medical University, Yinchuan, People’s Republic of China
| | - Fangang Meng
- grid.411617.40000 0004 0642 1244Beijing Neurosurgical Institute, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China ,grid.411617.40000 0004 0642 1244Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, People’s Republic of China ,grid.413259.80000 0004 0632 3337Beijing Key Laboratory of Neurostimulation, Beijing, People’s Republic of China ,grid.510934.a0000 0005 0398 4153Chinese Institute for Brain Research, Beijing, People’s Republic of China
| | - Feng Wang
- grid.452661.20000 0004 1803 6319Department of Neurosurgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang People’s Republic of China
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Horikoshi T, Noguchi H, Umehara T, Mutsuro-Aoki H, Kurihara R, Noguchi R, Hashimoto T, Watanabe Y, Ando T, Kamata K, Park SY, Tamura K. Crystal structure of Nanoarchaeum equitans tyrosyl-tRNA synthetase and its aminoacylation activity toward tRNA Tyr with an extra guanosine residue at the 5'-terminus. Biochem Biophys Res Commun 2021; 575:90-95. [PMID: 34461441 DOI: 10.1016/j.bbrc.2021.08.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 08/25/2021] [Accepted: 08/26/2021] [Indexed: 11/24/2022]
Abstract
tRNATyr of Nanoarchaeum equitans has a remarkable feature with an extra guanosine residue at the 5'-terminus. However, the N. equitans tRNATyr mutant without extra guanosine at the 5'-end was tyrosylated by tyrosyl-tRNA synthase (TyrRS). We solved the crystal structure of N. equitans TyrRS at 2.80 Å resolution. By comparing the present solved structure with the complex structures TyrRS with tRNATyr of Thermus thermophilus and Methanocaldococcus jannaschii, an arginine substitution mutant of N. equitans TyrRS at Ile200 (I200R), which is the putative closest candidate to the 5'-phosphate of C1 of N. equitans tRNATyr, was prepared. The I200R mutant tyrosylated not only wild-type tRNATyr but also the tRNA without the G-1 residue. Further tyrosylation analysis revealed that the second base of the anticodon (U35), discriminator base (A73), and C1:G72 base pair are strong recognition sites.
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Affiliation(s)
- Tatsuya Horikoshi
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Hiroki Noguchi
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Tsurumi, Yokohama 230-0045, Japan
| | - Takuya Umehara
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Hiromi Mutsuro-Aoki
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Ryodai Kurihara
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Ryohei Noguchi
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Takahiro Hashimoto
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Yuki Watanabe
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Tadashi Ando
- Department of Applied Electronics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan; Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kenichi Kamata
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Tsurumi, Yokohama 230-0045, Japan
| | - Sam-Yong Park
- Drug Design Laboratory, Graduate School of Medical Life Science, Yokohama City University, Tsurumi, Yokohama 230-0045, Japan
| | - Koji Tamura
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan; Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
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Datt M. Interplay of substrate polymorphism and conformational plasticity of Plasmodium tyrosyl-tRNA synthetase. Comput Biol Chem 2021; 95:107582. [PMID: 34571426 DOI: 10.1016/j.compbiolchem.2021.107582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 08/12/2021] [Accepted: 09/12/2021] [Indexed: 11/18/2022]
Abstract
Aminoacyl-tRNA synthetases are an indispensable component of ribosomal protein translational machinery and Plasmodium Tyrosyl-tRNA synthetase (PfTyrRS) is a validated drug target. This manuscript illustrates the dynamic conformational landscape of PfTyrRS in the context of substrate binding. Molecular dynamics simulations of PfTyrRS in the presence and absence of ligand show conformational heterogeneity for both the protein and the bound ligand. Diverse conformations for the evolutionarily conserved ATP binding motif (KMSKS) have been observed in both apo- and holo PfTyrRS. Further, the presented attributes of the tyrosyl-adenylate conformational sub-states in situ along with their implications on the strength of intermolecular interactions would be a pertinent benchmark for molecular design studies. In addition, an analysis of the ligand hydration pattern foregrounds the structurally conserved water-mediated inter-molecular interactions. The quantitative assessment of the conformational landscape, based on the fluctuations of the distance between the ligand binding pockets, of apo-PfTyrRS and holo-PfTyrRS highlights the nature of diversity in conformational sampling for the two cases. Evidently, the holo-PfTyrRS adopts a rather compact conformation compared to the apo-PfTyrRS. An intriguing asymmetry in the dynamics of the two monomers is contextualized with the functional asymmetry of the symmetrically dimeric PfTyrRS. Importantly, the network of non-bonded contacts in the apo- and holo- simulated ensembles has been analyzed. The graph-theoretic analysis-based novel insights concerning the nature of information flow as a function of ligation state would prove valuable in understanding PfTyrRS functions. The results presented here contend that understanding allostery in PfTyrRS is essential to astutely design structure-based inhibitors.
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Affiliation(s)
- Manish Datt
- Biological and Life Sciences Division, School of Arts and Sciences, Ahmedabad University, Ahmedabad, Gujarat - 380009, India.
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Abstract
Aminoacyl-tRNA synthetases catalyze the aminoacylation of their cognate tRNAs. Here we review the accumulated knowledge of non-canonical functions of human cytoplasmic aminoacyl-tRNA synthetases, especially tyrosyl- (TyrRS) and tryptophanyl-tRNA synthetase (TrpRS). Human TyrRS and TrpRS have an extra domain. Two distinct cytokines, i.e., the core catalytic "mini TyrRS" and the extra C-domain, are generated from human TyrRS by proteolytic cleavage. Moreover, the core catalytic domains of human TyrRS and TrpRS function as angiogenic and angiostatic factors, respectively, whereas the full-length forms are inactive for this function. It is also known that many synthetases change their localization in response to a specific signal and subsequently exhibit alternative functions. Furthermore, some synthetases function as sensors for amino acids by changing their protein interactions in an amino acid-dependent manner. Further studies will be necessary to elucidate regulatory mechanisms of non-canonical functions of aminoacyl-tRNA synthetases in particular, by analyzing the effect of their post-translational modifications.
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Affiliation(s)
- Keisuke Wakasugi
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan; Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan.
| | - Takumi Yokosawa
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Tokyo, Japan
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Tsukahara T, Yamagishi S, Neyama H, Ueda H. Tyrosyl-tRNA synthetase: A potential kyotorphin synthetase in mammals. Peptides 2018; 101:60-68. [PMID: 29289698 DOI: 10.1016/j.peptides.2017.12.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/17/2017] [Accepted: 12/27/2017] [Indexed: 11/24/2022]
Abstract
Kyotorphin (KTP; L-tyrosyl-l-arginine), an opioid-like analgesic discovered in the bovine brain, is potentially a neuromodulator because of its localization in synaptosomes, the existence of a specific KTP receptor, and the presence of its biosynthetic enzyme in the brain. KTP is formed in the brain from its constituent amino acids, L-tyrosine and L-arginine, by an enzyme termed KTP synthetase. However, the latter has never been identified. We aimed to test the hypothesis that tyrosyl-tRNA synthetase (TyrRS) is also KTP synthetase. We found that recombinant hTyrRS synthesizes KTP from tyrosine, arginine, and ATP, with Km = 1400 μM and 200 μM for arginine and tyrosine, respectively. TyrRS knockdown of PC12 cells with a small interfering RNA (siRNA) in the presence of 1.6 mM tyrosine, arginine, proline, or tryptophan significantly reduced the level of KTP, but not those of tyrosine-tyrosine, tyrosine-proline, or tyrosine-tryptophan. siRNA treatment did not affect cell survival or proliferation. In mice, TyrRS levels were found to be greater in the midbrain and medulla oblongata than in other brain regions. When arginine was administered 2 h prior to brain dissection, the KTP levels in these regions plus olfactory bulb significantly increased, although basal brain KTP levels remained relatively even. Our conclusion is further supported by a positive correlation across brain regions between TyrRS expression and arginine-accelerated KTP production.
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Affiliation(s)
- Tamotsu Tsukahara
- Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Shuhei Yamagishi
- Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hiroyuki Neyama
- Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hiroshi Ueda
- Department of Pharmacology and Therapeutic Innovation, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
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Richardson CJ, First EA. A continuous tyrosyl-tRNA synthetase assay that regenerates the tRNA substrate. Anal Biochem 2015; 486:86-95. [PMID: 25998103 DOI: 10.1016/j.ab.2015.05.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 04/23/2015] [Accepted: 05/11/2015] [Indexed: 01/09/2023]
Abstract
Tyrosyl-tRNA synthetase catalyzes the attachment of tyrosine to the 3' end of tRNA(Tyr), releasing AMP, pyrophosphate, and l-tyrosyl-tRNA as products. Because this enzyme plays a central role in protein synthesis, it has garnered attention as a potential target for the development of novel antimicrobial agents. Although high-throughput assays that monitor tyrosyl-tRNA synthetase activity have been described, these assays generally use stoichiometric amounts of tRNA, limiting their sensitivity and increasing their cost. Here, we describe an alternate approach in which the Tyr-tRNA product is cleaved, regenerating the free tRNA substrate. We show that cyclodityrosine synthase from Mycobacterium tuberculosis can be used to cleave the l-Tyr-tRNA product, regenerating the tRNA(Tyr) substrate. Because tyrosyl-tRNA synthetase can use both l- and d-tyrosine as substrates, we replaced the cyclodityrosine synthase in the assay with d-tyrosyl-tRNA deacylase, which cleaves d-Tyr-tRNA. This substitution allowed us to use the tyrosyl-tRNA synthetase assay to monitor the aminoacylation of tRNA(Tyr) by d-tyrosine. Furthermore, by making Tyr-tRNA cleavage the rate-limiting step, we are able to use the assay to monitor the activities of cyclodityrosine synthetase and d-tyrosyl-tRNA deacylase. Specific methods to extend the tyrosyl-tRNA synthetase assay to monitor both the aminoacylation and post-transfer editing activities in other aminoacyl-tRNA synthetases are discussed.
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Wang XD, Deng RC, Dong JJ, Peng ZY, Gao XM, Li ST, Lin WQ, Lu CL, Xiao ZP, Zhu HL. 3-Aryl-4-acyloxyethoxyfuran-2(5H)-ones as inhibitors of tyrosyl-tRNA synthetase: synthesis, molecular docking and antibacterial evaluation. Bioorg Med Chem 2013; 21:4914-22. [PMID: 23891164 DOI: 10.1016/j.bmc.2013.06.066] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 06/26/2013] [Accepted: 06/28/2013] [Indexed: 11/26/2022]
Abstract
Thirty-eight 3-aryl-4-acyloxyethoxyfuran-2(5H)-ones were designed, prepared and tested for antibacterial activities. Some of them showed significant antibacterial activity against Gram-positive organism, Gram-negative organism and fungus. Out of these compounds, 4-(2-(3-chlorophenylformyloxy)ethoxy)-3-(4-chlorophenyl)furan-2(5H)-one (d40) showed the widest spectrum of activity with MIC50 of 2.0μg/mL against Staphylococcus aureus, 4.3μg/mL against Escherichia coli, 1.5μg/mL against Pseudomonas aeruginosa and 1.2μg/mL against Candida albicans. Our data disclosed that MIC50 values against whole cell bacteria are positive correlation with MIC50 values against tyrosyl-tRNA synthetase. Meanwhile, molecular docking of d40 into S. aureus tyrosyl-tRNA synthetase active site was also performed, and the inhibitor tightly fitting the active site might be an important reason why it has high antimicrobial activity.
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Affiliation(s)
- Xu-Dong Wang
- College of Chemistry and Chemical Engineering, Key Laboratory of Hunan Forest Products and Chemical Industry Engineering, Jishou University, Jishou 416000, PR China
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Zhou X, Xue L, Hao L, Liu S, Zhou F, Xiong H, Qi X, Lin D, Shao S. Proteomics-based identification of tumor relevant proteins in lung adenocarcinoma. Biomed Pharmacother 2013; 67:621-7. [PMID: 23916545 DOI: 10.1016/j.biopha.2013.06.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 06/17/2013] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Lung cancer has the highest mortality rate among malignant tumors. Proteomics is a powerful tool to identify protein biomarkers. The identification of protein biomarkers associated with lung adenocarcinoma would have significance for making prognoses and designing targeted therapies. METHODS In our study, we applied a two-dimensional difference gel electrophoresis approach coupled to a matrix-assisted laser desorption/ionization time-of-flight mass spectrometric analysis for the identification of proteins differentially expressed between lung adenocarcinoma and the paired normal bronchial epithelial tissues derived from seven patients (four of them developed distant metastasis after operation). In addition, we chose two candidate proteins and examine their expression levels in lung adenocarcinoma and adjacent normal tissues using immunohistochemistry methods, and their expression levels in serum of patients and healthy donors by ELISA. RESULT In this study, 173 proteins were found to be differentially expressed (ratio>1.5 or<-1.5, P≤0.05), and 22 of them were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Thirteen proteins were at lower levels in the lung adenocarcinoma group, while nine proteins were at higher abundance. Immunohistochemistry analysis confirmed the expression levels of the two candidate proteins. The differential expression of the candidate secreted protein in serum from lung adenocarcinoma samples and healthy controls was showed by ELISA. CONCLUSION Our results demonstrated a differential protein expression pattern for lung adenocarcinoma compared with the paired normal bronchial epithelial tissues. Further functional validation of candidate proteins is ongoing and might provide new insights in lung adenocarcinoma.
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Affiliation(s)
- Xin Zhou
- Key Laboratory for Proteomics of Liaoning Province, Dalian Medical University, Dalian, Liaoning, PR China
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