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Zhan Y, Zhao CS, Qu X, Xiao Z, Deng C, Li Y. Identification of a novel amphioxus leucine-rich repeat receptor involved in phagocytosis reveals a role for Slit2-N-type LRR in bacterial elimination. J Biol Chem 2023; 299:104689. [PMID: 37044216 DOI: 10.1016/j.jbc.2023.104689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 03/25/2023] [Accepted: 03/31/2023] [Indexed: 04/14/2023] Open
Abstract
The basal chordate amphioxus is a model for tracing the origin and evolution of vertebrate immunity. To explore the evolution of immunoreceptor signaling pathways, we searched the associated receptors of the amphioxus B. belcheri (Bb) homolog of immunoreceptor signaling adaptor protein Grb2. Mass-spectrum analysis of BbGrb2 immunoprecipitates from B. belcheri intestine lysates revealed a folate receptor (FR) domain- and leucine-rich repeat (LRR)-containing protein (FrLRR). Sequence and structural analysis showed that FrLRR is a membrane protein with a predicted curved solenoid structure. The N-terminal Fr domain contains very few folate-binding sites; the following LRR region is a Slit2-type LRR, and a GPI-anchored site was predicted at the C-terminus. RT-PCR analysis showed FrLRR is a transcription-mediated fusion gene of BbFR-like and BbSlit2-N-like genes. Genomic DNA structure analysis implied the B. belcheri FrLRR gene locus and the corresponding locus in B. floridae might be generated by exon shuffling of a Slit2-N-like gene into an FR gene. RT-qPCR, immunostaining and immunoblot results showed that FrLRR was primarily distributed in B. belcheri intestinal tissue. We further demonstrated that FrLRR localized to the cell membrane and lysosomes. Functionally, FrLRR mediated and promoted bacteria-binding and phagocytosis, and FrLRR antibody blocking or Grb2 knockdown inhibited FrLRR-mediated phagocytosis. Interestingly, we found that human Slit2-N (hSlit2-N) also mediated direct bacteria-binding and phagocytosis which was inhibited by Slit2-N antibody blocking or Grb2 knockdown. Together, these results indicate FrLRR and hSlit2-N may function as phagocytotic-receptors to promote phagocytosis through Grb2, implying the Slit2-N-type-LRR-containing proteins play a role in bacterial binding and elimination.
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Affiliation(s)
- Yanli Zhan
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Chen-Si Zhao
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Xuemei Qu
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Zhihui Xiao
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Chong Deng
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
| | - Yingqiu Li
- MOE Key Laboratory of Gene Function and Regulation, Guangdong Province Key Laboratory of Pharmaceutical Functional Genes, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
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Tariq F, Khan W, Ahmad W, Riaz SK, Khan M, Sherwani S, Haque S, Malik MFA, Iftikhar MJ, Khan S, Haq F. Effect of MHC Linked 7-Gene Signature on Delayed Hepatocellular Carcinoma Recurrence. J Pers Med 2021; 11:jpm11111129. [PMID: 34834481 PMCID: PMC8625636 DOI: 10.3390/jpm11111129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/26/2021] [Accepted: 10/28/2021] [Indexed: 11/16/2022] Open
Abstract
Dysregulated immune response significantly affects hepatocellular carcinoma's (HCC) prognosis. Human Leukocyte Antigens are key in devising immune responses against HCC. Here, we investigated how HLAs modulate HCC development at the transcriptomic level. RNA-seq data of 576 patients from two independent cohorts was retrieved. The clinicopathological relevance of all HLA genes was investigated using Fisher-Exact, correlation, and Kaplan-Meier and cox regression survival tests. Clustering of ~800 immune-related genes against HLAs was completed using a ward-agglomerative method. Networks were generated using 40 HLA associated unique genes and hub genes were investigated. HLAs including HLA-DMA, HLA-DMB, HLA-DOA and HLA-DRB6 were associated with delayed recurrence in both discovery (204 HCC cases) and validation (372 HCC cases) cohorts. Clustering analyses revealed 40 genes associated with these four HLAs in both cohorts. A set of seven genes (NCF4, TYROBP, LCP2, ZAP70, PTPRC, FYN and WAS) was found co-expressed at gene-gene interaction level in both cohorts. Furthermore, survival analysis revealed seven HLA-linked genes as predictors of delayed recurrence. Multivariate analysis also predicted that mean expression of 7-gene is an independent predictor of delayed recurrence in both cohorts. We conclude that the expression of 7-gene signature may lead to improved patient prognosis. Further studies are required for consideration in clinical practice.
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Affiliation(s)
- Fomaz Tariq
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
| | - Walizeb Khan
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
| | - Washaakh Ahmad
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
| | - Syeda Kiran Riaz
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
- Department of Molecular Biology, Shaheed Zulfiqar Ali Bhutto Medical University, Islamabad 44000, Pakistan
- College of Medicine, Texas A&M University, College Station, TX 77840-77845, USA
| | - Mahvish Khan
- Department of Biology, College of Science, Ha’il University, Ha’il 55211, Saudi Arabia; (M.K.); (S.S.)
| | - Subuhi Sherwani
- Department of Biology, College of Science, Ha’il University, Ha’il 55211, Saudi Arabia; (M.K.); (S.S.)
| | - Shafiul Haque
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan 45142, Saudi Arabia;
- Faculty of Medicine, Görükle Campus, Bursa Uludağ University, Bursa 16059, Turkey
| | - Muhammad Faraz Arshad Malik
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
| | | | - Saif Khan
- Department of Basic Dental and Medical Sciences, College of Dentistry, Ha’il University, Ha’il 55211, Saudi Arabia
- Correspondence: (S.K.); (F.H.)
| | - Farhan Haq
- Department of Biosciences, COMSATS University, Islamabad 44000, Pakistan; (F.T.); (W.K.); (W.A.); (S.K.R.); (M.F.A.M.)
- Correspondence: (S.K.); (F.H.)
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Recent Advances in Molecular Mechanisms of the NKG2D Pathway in Hepatocellular Carcinoma. Biomolecules 2020; 10:biom10020301. [PMID: 32075046 PMCID: PMC7094213 DOI: 10.3390/biom10020301] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 02/16/2020] [Indexed: 02/08/2023] Open
Abstract
Hepatocellular carcinoma is a common malignant tumor with high mortality. Its malignant proliferation, invasion, and metastasis are closely related to the cellular immune function of the patients. NKG2D is a key activated and type II membrane protein molecule expressed on the surface of almost all NK cells. The human NKG2D gene is 270 kb long, located at 12p12.3-p13.1, and contains 10 exons and 9 introns. The three-dimensional structure of the NKG2D monomeric protein contains two alpha-helices, two beta-lamellae, and four disulfide bonds, and its' signal of activation is transmitted mainly by the adaptor protein (DAP). NKG2D ligands, including MICA, MICB, and ULBPs, can be widely expressed in hepatoma cells. After a combination of NKG2D and DAP10 in the form of homologous two polymers, the YxxM motif in the cytoplasm is phosphorylated and then signaling pathways are also gradually activated, such as PI3K, PLCγ2, JNK-cJunN, and others. Activated NK cells can enhance the sensitivity to hepatoma cells and specifically dissolve by releasing a variety of cytokines (TNF-α and IFN-γ), perforin, and high expression of FasL, CD16, and TRAIL. NK cells may specifically bind to the over-expressed MICA, MICB, and ULBPs of hepatocellular carcinoma cells through the surface activating receptor NKG2D, which can help to accurately identify hepatoma, play a critical role in anti-hepatoma via the pathway of cytotoxic effects, and obviously delay the poor progress of hepatocellular carcinoma.
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Chen ZL, Gong BN, Wang QL, Xiao ZH, Deng C, Wang WQ, Li Y. Characterisation of amphioxus protein kinase C-δ/θ reveals a unique proto-V3 domain suggesting an evolutionary mechanism for PKC-θ unique V3. FISH & SHELLFISH IMMUNOLOGY 2019; 84:1100-1107. [PMID: 30408601 DOI: 10.1016/j.fsi.2018.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/29/2018] [Accepted: 11/01/2018] [Indexed: 06/08/2023]
Abstract
A primitive adaptive immune system has recently been suggested to be present in a basal chordate amphioxus (Branchiostoma belcheri, Bb), making it an ideal model for studying the origin of adaptive immune. The novel protein kinase C isoform PKC-θ, but not its closest isoform PKC-δ, plays a critical role for mammalian T-cell activation via translocation to immunological synapse (IS) mediated by a unique PKC-θ V3 domain containing one PxxP motif. To understand the evolution of this unique PKC-θ V3 domain and the primitive adaptive immune system in amphioxus, we comparatively studied the orthologs of PKC-δ and -θ from amphioxus and other species. Phylogenetic analysis showed BbPKC-δ/θ to be the common ancestor of vertebrate PKC-δ and PKC-θ, with a V3 domain containing two PxxP motifs. One motif is conserved in both zebrafish and mammalian PKC-θ but is absent in PKC-δ V3 domain of these species, and has already emerged in drosophila PKC-δ. The other non-conserved motif emerged in BbPKC-δ/θ, and only retained in Danio rerio PKC-δ (DrPKC-δ) but lost in mammalian PKC-δ and -θ. Comparative analyses of the sequence and function of BbPKC-δ/θ, DrPKC-δ, DrPKC-θ and Homo sapiens PKC-θ (HsPKC-θ) in IS translocation and T-cell receptor (TCR)-induced NF-κB activation revealed that retention of the conserved PxxP motif and loss of the non-conserved PxxP motif in mammalian PKC-θ and loss of both PxxP motifs in mammalian PKC-δ accomplish the unique function of PKC-θ in T cells. Together, this study suggests an evolutionary mechanism for PKC-θ unique V3 and reveals BbPKC-δ/θ is the common ancestor of PKC-δ and -θ with a functional proto-V3 domain, supplying new evidence for the existence of primitive adaptive immune system in amphioxus.
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Affiliation(s)
- Zhi-Long Chen
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Bei-Ni Gong
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Qi-Long Wang
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Zhi-Hui Xiao
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Chong Deng
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Wen-Qian Wang
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China
| | - Yingqiu Li
- State Key Laboratory for Biocontrol, School of Life Science, Sun Yat-sen University, Guangzhou, 510006, PR China.
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