1
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Zhang D, Yang J, Huang Q, Zhao D, Wang T, Yu D, Qin L, Zhang K. Molecular functions of HAX1 during disease progress. Virus Genes 2024; 60:435-445. [PMID: 38992331 DOI: 10.1007/s11262-024-02081-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 05/29/2024] [Indexed: 07/13/2024]
Abstract
HCLS1-associated protein X-1 (HAX1) is a newly discovered multifunctional cell regulatory protein that is widely expressed in cells and has a close relationship with multiple cellular proteins. HAX1 plays important roles in various processes, including the regulation of apoptosis, maintenance of mitochondrial membrane potential stability and calcium homeostasis, occurrence and development of diseases, post-transcriptional regulation of gene expression, and host immune response after viral infection. In this article, we have reviewed the research progress on the biological functions of HAX1, thereby laying a theoretical foundation for further exploration of its underlying mechanisms and targeted application.
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Affiliation(s)
- Dajun Zhang
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China
| | - Jinke Yang
- State Key Laboratory for Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730000, China
| | - Qi Huang
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China
| | - Dengshuai Zhao
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China
| | - Tianyu Wang
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China
| | - Dixi Yu
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China
| | - Limei Qin
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China.
| | - Keshan Zhang
- College of Life Sciences and Engineering, Foshan University, Foshan, 528225, Guangdong Province, People's Republic of China.
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2
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Zhan W, Li Z, Zhang J, Liu Y, Liu G, Li B, Shen R, Jiang Y, Shang W, Gao S, Wu H, Wang Y, Chen W, Wang Z. Energy stress promotes P-bodies formation via lysine-63-linked polyubiquitination of HAX1. EMBO J 2024; 43:2759-2788. [PMID: 38769438 PMCID: PMC11217408 DOI: 10.1038/s44318-024-00120-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 03/22/2024] [Accepted: 04/15/2024] [Indexed: 05/22/2024] Open
Abstract
Energy stress, characterized by the reduction of intracellular ATP, has been implicated in various diseases, including cancer. Here, we show that energy stress promotes the formation of P-bodies in a ubiquitin-dependent manner. Upon ATP depletion, the E3 ubiquitin ligase TRIM23 catalyzes lysine-63 (K63)-linked polyubiquitination of HCLS1-associated protein X-1 (HAX1). HAX1 ubiquitination triggers its liquid‒liquid phase separation (LLPS) and contributes to P-bodies assembly induced by energy stress. Ubiquitinated HAX1 also interacts with the essential P-body proteins, DDX6 and LSM14A, promoting their condensation. Moreover, we find that this TRIM23/HAX1 pathway is critical for the inhibition of global protein synthesis under energy stress conditions. Furthermore, high HAX1 ubiquitination, and increased cytoplasmic localization of TRIM23 along with elevated HAX1 levels, promotes colorectal cancer (CRC)-cell proliferation and correlates with poor prognosis in CRC patients. Our data not only elucidate a ubiquitination-dependent LLPS mechanism in RNP granules induced by energy stress but also propose a promising target for CRC therapy.
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Affiliation(s)
- Wanqi Zhan
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Zhiyang Li
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Jie Zhang
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Shanghai, China
| | - Yongfeng Liu
- Radiation Medicine Institute, The First Affiliated Hospital, ZhengZhou University, ZhengZhou, Henan, China
| | - Guanglong Liu
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Bingsong Li
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Jinfeng Laboratory, Chongqing, China
| | - Rong Shen
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Yi Jiang
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Shanghai, China
| | - Wanjing Shang
- Lymphocyte Biology Section, Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, USA
| | - Shenjia Gao
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Shanghai, China
| | - Han Wu
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China
- Shanghai Key Laboratory of Perioperative Stress and Protection, Shanghai, China
| | - Ya'nan Wang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
- Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China
- Guangdong Province Key Laboratory of Molecular Tumor Pathology, Guangzhou, Guangdong, China
| | - Wankun Chen
- Department of Anesthesiology, Zhongshan Hospital, Fudan University, Shanghai, China.
- Shanghai Key Laboratory of Perioperative Stress and Protection, Shanghai, China.
- Department of Anesthesiology, Qingpu Branch of Zhongshan Hospital, Fudan University, Shanghai, China.
| | - Zhizhang Wang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.
- Jinfeng Laboratory, Chongqing, China.
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3
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Trębińska-Stryjewska A, Wakula M, Chmielarczyk M, Grzybowska EA. HAX1: A versatile, intrinsically disordered regulatory protein. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2023; 1870:119538. [PMID: 37454914 DOI: 10.1016/j.bbamcr.2023.119538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/20/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
HAX1 is a relatively small, ubiquitously expressed, predominantly mitochondrial, intrinsically disordered protein. It has been implicated in the regulation of apoptosis, cell migration, calcium cycling, proteostasis, angiogenesis, autophagy and translation. A wide spectrum of functions, numerous interactions and still elusive molecular mechanisms of action make HAX1 an intriguing subject of research. Moreover, HAX1 is involved in the pathogenesis of diseases; its deficiency leads to neutropenia and its overexpression is associated with cancer. In this review we aim to describe the characteristics of HAX1 gene and protein, and comprehensively discuss its multiple functions, highlighting the emerging role of HAX1 in protection from stress and apoptosis through maintaining cellular proteostasis and homeostasis.
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Affiliation(s)
| | - Maciej Wakula
- Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland
| | | | - Ewa A Grzybowska
- Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland.
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4
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Balcerak A, Macech-Klicka E, Wakula M, Tomecki R, Goryca K, Rydzanicz M, Chmielarczyk M, Szostakowska-Rodzos M, Wisniewska M, Lyczek F, Helwak A, Tollervey D, Kudla G, Grzybowska EA. The RNA-Binding Landscape of HAX1 Protein Indicates Its Involvement in Translation and Ribosome Assembly. Cells 2022; 11:cells11192943. [PMID: 36230905 PMCID: PMC9564044 DOI: 10.3390/cells11192943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/13/2022] [Accepted: 09/15/2022] [Indexed: 11/18/2022] Open
Abstract
HAX1 is a human protein with no known homologues or structural domains. Mutations in the HAX1 gene cause severe congenital neutropenia through mechanisms that are poorly understood. Previous studies reported the RNA-binding capacity of HAX1, but the role of this binding in physiology and pathology remains unexplained. Here, we report the transcriptome-wide characterization of HAX1 RNA targets using RIP-seq and CRAC, indicating that HAX1 binds transcripts involved in translation, ribosome biogenesis, and rRNA processing. Using CRISPR knockouts, we find that HAX1 RNA targets partially overlap with transcripts downregulated in HAX1 KO, implying a role in mRNA stabilization. Gene ontology analysis demonstrated that genes differentially expressed in HAX1 KO (including genes involved in ribosome biogenesis and translation) are also enriched in a subset of genes whose expression correlates with HAX1 expression in four analyzed neoplasms. The functional connection to ribosome biogenesis was also demonstrated by gradient sedimentation ribosome profiles, which revealed differences in the small subunit:monosome ratio in HAX1 WT/KO. We speculate that changes in HAX1 expression may be important for the etiology of HAX1-linked diseases through dysregulation of translation.
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Affiliation(s)
- Anna Balcerak
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Ewelina Macech-Klicka
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Maciej Wakula
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Rafal Tomecki
- Laboratory of RNA Processing and Decay, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
- Faculty of Biology, Institute of Genetics and Biotechnology, University of Warsaw, 02-106 Warsaw, Poland
| | - Krzysztof Goryca
- Genomics Core Facility, Centre of New Technologies University of Warsaw, 02-097 Warsaw, Poland
| | - Malgorzata Rydzanicz
- Department of Medical Genetics, Medical University of Warsaw, 02-106 Warsaw, Poland
| | - Mateusz Chmielarczyk
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Malgorzata Szostakowska-Rodzos
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Marta Wisniewska
- Laboratory of Biological Chemistry of Metal Ions, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Filip Lyczek
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
| | - Aleksandra Helwak
- Wellcome Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - David Tollervey
- Wellcome Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3BF, UK
| | - Grzegorz Kudla
- MRC Human Genetics Unit, University of Edinburgh, Edinburgh EH4 2XU, UK
| | - Ewa A. Grzybowska
- Molecular and Translational Oncology, Maria Sklodowska-Curie National Research Institute of Oncology, 02-781 Warsaw, Poland
- Correspondence:
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5
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The interactome of multifunctional HAX1 protein suggests its role in the regulation of energy metabolism, de-aggregation, cytoskeleton organization and RNA-processing. Biosci Rep 2021; 40:226900. [PMID: 33146709 PMCID: PMC7670567 DOI: 10.1042/bsr20203094] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 10/14/2020] [Accepted: 11/02/2020] [Indexed: 01/07/2023] Open
Abstract
HCLS1-associated protein X-1 (HAX1) is a multifunctional protein involved in many cellular processes, including apoptosis, cell migration and calcium homeostasis, but its mode of action still remains obscure. Multiple HAX1 protein partners have been identified, but they are involved in many distinct pathways, form different complexes and do not constitute a coherent group. By characterizing HAX1 protein interactome using targeted approach, we attempt to explain HAX1 multiple functions and its role in the cell. Presented analyses indicate that HAX1 interacts weakly with a wide spectrum of proteins and its interactome tends to be cell-specific, which conforms to a profile of intrinsically disordered protein (IDP). Moreover, we have identified a mitochondrial subset of HAX1 protein partners and preliminarily characterized its involvement in the cellular response to oxidative stress and aggregation.
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6
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Pisani C, Onori A, Gabanella F, Di Certo MG, Passananti C, Corbi N. Identification of protein/mRNA network involving the PSORS1 locus gene CCHCR1 and the PSORS4 locus gene HAX1. Exp Cell Res 2021; 399:112471. [PMID: 33417922 DOI: 10.1016/j.yexcr.2021.112471] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 12/22/2020] [Accepted: 12/30/2020] [Indexed: 01/22/2023]
Abstract
CCHCR1 (Coiled-Coil alpha-Helical Rod 1), maps to chromosomal region 6p21.3, within the major psoriasis susceptibility locus PSORS1. CCHCR1 itself is a plausible psoriasis candidate gene, however its role in psoriasis pathogenesis remains unclear. We previously demonstrated that CCHCR1 protein acts as a cytoplasmic docking site for RNA polymerase II core subunit 3 (RPB3) in cycling cells, suggesting a role for CCHCR1 in vesicular trafficking between cellular compartments. Here, we report a novel interaction between CCHCR1 and the RNA binding protein HAX1. HAX1 maps to chromosomal region 1q21.3 within the PSORS4 locus and is over-expressed in psoriasis. Both CCHCR1 and HAX1 share subcellular co-localization with mitochondria, nuclei and cytoplasmic vesicles as P-bodies. By a series of ribonucleoprotein immunoprecipitation (RIP) assays, we isolated a pool of mRNAs complexed with HAX1 and/or CCHCR1 proteins. Among the mRNAs complexed with both CCHCR1 and HAX1 proteins, there are Vimentin mRNA, previously described to be bound by HAX1, and CAMP/LL37 mRNA, whose gene product is over-expressed in psoriasis.
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Affiliation(s)
- Cinzia Pisani
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Italy.
| | - Annalisa Onori
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Italy.
| | - Francesca Gabanella
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Italy; CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Italy.
| | - Maria Grazia Di Certo
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Italy.
| | - Claudio Passananti
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Italy.
| | - Nicoletta Corbi
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Italy.
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7
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Larsen EK, Weber DK, Wang S, Gopinath T, Blackwell DJ, Dalton MP, Robia SL, Gao J, Veglia G. Intrinsically disordered HAX-1 regulates Ca 2+ cycling by interacting with lipid membranes and the phospholamban cytoplasmic region. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2020; 1862:183034. [PMID: 31400305 PMCID: PMC6899184 DOI: 10.1016/j.bbamem.2019.183034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 07/09/2019] [Accepted: 07/30/2019] [Indexed: 01/14/2023]
Abstract
Hematopoietic-substrate-1 associated protein X-1 (HAX-1) is a 279 amino acid protein expressed ubiquitously. In cardiac muscle, HAX-1 was found to modulate the sarcoendoplasmic reticulum calcium ATPase (SERCA) by shifting its apparent Ca2+ affinity (pCa). It has been hypothesized that HAX-1 binds phospholamban (PLN), enhancing its inhibitory function on SERCA. HAX-1 effects are reversed by cAMP-dependent protein kinase A that phosphorylates PLN at Ser16. To date, the molecular mechanisms for HAX-1 regulation of the SERCA/PLN complex are still unknown. Using enzymatic, in cell assays, circular dichroism, and NMR spectroscopy, we found that in the absence of a binding partner HAX-1 is essentially disordered and adopts a partial secondary structure upon interaction with lipid membranes. Also, HAX-1 interacts with the cytoplasmic region of monomeric and pentameric PLN as detected by NMR and in cell FRET assays, respectively. We propose that the regulation of the SERCA/PLN complex by HAX-1 is mediated by its interactions with lipid membranes, adding another layer of control in Ca2+ homeostatic balance in the heart muscle.
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Affiliation(s)
- Erik K Larsen
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Daniel K Weber
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Songlin Wang
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Tata Gopinath
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | | | - Michael P Dalton
- Department of Physiology, Loyola University, Maywood, IL 60153, USA
| | - Seth L Robia
- Department of Physiology, Loyola University, Maywood, IL 60153, USA
| | - Jiali Gao
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA; School of Chemical Biology and Technology, Beijing University Graduate School, Shenzhen 518055, China
| | - Gianluigi Veglia
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA; Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
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8
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Balcerak A, Trebinska-Stryjewska A, Wakula M, Chmielarczyk M, Smietanka U, Rubel T, Konopinski R, Macech-Klicka E, Zub R, Grzybowska EA. HAX1 impact on collective cell migration, cell adhesion, and cell shape is linked to the regulation of actomyosin contractility. Mol Biol Cell 2019; 30:3024-3036. [PMID: 31644363 PMCID: PMC6880882 DOI: 10.1091/mbc.e19-05-0304] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
HAX1 protein is involved in the regulation of apoptosis, cell motility and calcium homeostasis. Its overexpression was reported in several tumors, including breast cancer. This study demonstrates that HAX1 has an impact on collective, but not single-cell migration, thus indicating the importance of cell–cell contacts for the HAX1-mediated effect. Accordingly, it was shown that HAX1 knockdown affects cell–cell junctions, substrate adhesion, and epithelial cell layer integrity. As demonstrated here, these effects can be attributed to the modulation of actomyosin contractility through changes in RhoA and septin signaling. Additionally, it was shown that HAX1 does not influence invasive potential in the breast cancer cell line, suggesting that its role in breast cancer progression may be linked instead to collective invasion of the epithelial cells but not single-cell dissemination.
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Affiliation(s)
- Anna Balcerak
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland
| | - Alicja Trebinska-Stryjewska
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland.,Biomedical Engineering Centre, Institute of Optoelectronics, Military University of Technology, 00-908 Warsaw, Poland
| | - Maciej Wakula
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland
| | | | - Urszula Smietanka
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland
| | - Tymon Rubel
- Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, 00-665 Warsaw, Poland
| | - Ryszard Konopinski
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland
| | | | - Renata Zub
- The Maria Sklodowska-Curie Institute-Oncology Center, 02-781 Warsaw, Poland
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9
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Karapınar TH, Yılmaz Karapinar D, Oymak Y, Ay Y, Demirağ B, Aykut A, Onay H, Hazan F, Aydınok Y, Özkınay F, Vergin C. HAX1 mutation positive children presenting with haemophagocytic lymphohistiocytosis. Br J Haematol 2017; 177:597-600. [PMID: 28169428 DOI: 10.1111/bjh.14574] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 12/05/2016] [Indexed: 11/26/2022]
Abstract
The genetic basis of haemophagocytic lymphohistiocytosis (HLH) has not been elucidated in 10% of affected patients. In this study, we report four HLH episodes in three patients with HAX1 gene mutations. We screened the mutations associated with congenital neutropenia (CN) because the neutropenia persisted following HLH treatment. There were homozygous HAX1 mutations detected in all patients. This is the first case series of patients with CN caused by HAX1 mutation who presented with HLH. We hypothesize that severe neutropenia persists after an HLH episode in children without HLH mutations (especially infants) because these patients have CN caused by HAX1 mutations.
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Affiliation(s)
- Tuba H Karapınar
- Department of Paediatric Haematology-Oncology, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
| | - Deniz Yılmaz Karapinar
- Department of Paediatric Haematology-Oncology, Ege University Faculty of Medicine, Izmir, Turkey
| | - Yeşim Oymak
- Department of Paediatric Haematology-Oncology, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
| | - Yılmaz Ay
- Department of Paediatric Haematology-Oncology, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
| | - Bengü Demirağ
- Department of Paediatric Haematology-Oncology, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
| | - Ayça Aykut
- Department of Medical Genetics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Hüseyin Onay
- Department of Medical Genetics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Filiz Hazan
- Department of Medical Genetics, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
| | - Yeşim Aydınok
- Department of Paediatric Haematology-Oncology, Ege University Faculty of Medicine, Izmir, Turkey
| | - Ferda Özkınay
- Department of Medical Genetics, Ege University Faculty of Medicine, Izmir, Turkey
| | - Canan Vergin
- Department of Paediatric Haematology-Oncology, Dr. Behçet Uz Children Research and Training Hospital, Izmir, Turkey
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10
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Qian L, Bradford AM, Cooke PH, Lyons BA. Grb7 and Hax1 may colocalize partially to mitochondria in EGF-treated SKBR3 cells and their interaction can affect Caspase3 cleavage of Hax1. J Mol Recognit 2016; 29:318-33. [PMID: 26869103 DOI: 10.1002/jmr.2533] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 12/10/2015] [Accepted: 12/14/2015] [Indexed: 11/11/2022]
Abstract
Growth factor receptor bound protein 7 (Grb7) is a signal-transducing adaptor protein that mediates specific protein-protein interactions in multiple signaling pathways. Grb7, with Grb10 and Grb14, is members of the Grb7 protein family. The topology of the Grb7 family members contains several protein-binding domains that facilitate the formation of protein complexes, and high signal transduction efficiency. Grb7 has been found overexpressed in several types of cancers and cancer cell lines and is presumed involved in cancer progression through promotion of cell proliferation and migration via interactions with the erythroblastosis oncogene B 2 (human epidermal growth factor receptor 2) receptor, focal adhesion kinase, Ras-GTPases, and other signaling partners. We previously reported Grb7 binds to Hax1 (HS1 associated protein X1) isoform 1, an anti-apoptotic protein also involved in cell proliferation and calcium homeostasis. In this study, we confirm that the in vitro Grb7/Hax1 interaction is exclusive to these two proteins and their interaction does not depend on Grb7 dimerization state. In addition, we report Grb7 and Hax1 isoform 1 may colocalize partially to mitochondria in epidermal growth factor-treated SKBR3 cells and growth conditions can affect this colocalization. Moreover, Grb7 can affect Caspase3 cleavage of Hax1 isoform 1 in vitro, and Grb7 expression may slow Caspase3 cleavage of Hax1 isoform 1 in apoptotic HeLa cells. Finally, Grb7 is shown to increase cell viability in apoptotic HeLa cells in a time-dependent manner. Taken together, these discoveries provide clues for the role of a Grb7/Hax1 protein interaction in apoptosis pathways involving Hax1. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Lei Qian
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Andrew M Bradford
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Peter H Cooke
- Core University Research Resources Laboratory, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Barbara A Lyons
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM, 88003, USA
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