1
|
Li G, Li Y, Tang X, Wang L, Yue S, He S, Li T. LKB1 suppresses KSHV reactivation and promotes primary effusion lymphoma progression. J Virol 2024:e0060424. [PMID: 39194241 DOI: 10.1128/jvi.00604-24] [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: 04/02/2024] [Accepted: 07/19/2024] [Indexed: 08/29/2024] Open
Abstract
Viruses normally reprogram the host cell metabolic pathways as well as metabolic sensors to facilitate their persistence. The serine-threonine liver kinase B1 (LKB1) is a master upstream kinase of 5'-AMP-activated protein kinase (AMPK) that senses the energy status and therefore regulates the intracellular metabolic homeostasis. Previous studies showed that AMPK restricts Kaposi's sarcoma-associated herpesvirus (KSHV) lytic replication in endothelial cells during primary infection and promotes primary effusion lymphoma (PEL) cell survival. However, the role of LKB1 in KSHV lytic reactivation and KSHV-associated malignancies is unclear. In this study, we found that LKB1 is phosphorylated or activated in KSHV-positive PEL cells. Mechanistically, KSHV-encoded vCyclin mediated LKB1 activation in PEL cells, as vCyclin knockout ablated, while vCyclin overexpression enhanced LKB1 activation. Furthermore, knockdown of LKB1 inactivated AMPK and induced KSHV reactivation, as indicated by the increased expression of viral lytic genes and the increased virions in supernatants. Accordingly, AMPK inhibition by functional knockdown or a pharmacologic inhibitor, Compound C, promoted KSHV reactivation in PEL cells. Furthermore, inhibition of either LKB1 or AMPKα1 efficiently induced cell death by apoptosis of PEL cells both in vitro and in vivo. Together, these results identify LKB1 as a vulnerable target for PEL, which could be potentially exploited for treating other virus-associated diseases.IMPORTANCEKaposi's sarcoma-associated herpesvirus (KSHV) is an oncogenic virus associated with several human cancers, such as primary effusion lymphoma (PEL). Here, we showed that serine-threonine liver kinase B1 (LKB1), upstream of 5' AMP-activated protein kinase (AMPK), is activated by KSHV-encoded vCyclin and maintains KSHV latency in PEL cells. Inhibition of either LKB1 or AMPK enhances KSHV lytic replication from latency, which at least partially accounts for PEL cell death by apoptosis. Compound C, a potent AMPK inhibitor, induced KSHV reactivation and efficiently inhibited PEL progression in vivo. Thus, our work revealed that LKB1 is a potential therapeutic target for KSHV-associated cancers.
Collapse
Affiliation(s)
- Guanya Li
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Yinan Li
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Xinyu Tang
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Lijie Wang
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Shusheng Yue
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Shanping He
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Tingting Li
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- Hunan Provincial Key Laboratory of Animal Intestinal Function and Regulation, College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| |
Collapse
|
2
|
Parama D, BharathwajChetty B, Jayaprakash S, Lee EHC, Khatoon E, Alqahtani MS, Abbas M, Kumar AP, Kunnumakkara AB. The emerging role of human papillomavirus in lung cancer. Life Sci 2024; 351:122785. [PMID: 38851420 DOI: 10.1016/j.lfs.2024.122785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 04/20/2024] [Accepted: 06/04/2024] [Indexed: 06/10/2024]
Abstract
Lung cancer stands as one of the most lethal diseases and is the foremost cause of cancer-related mortalities worldwide. The pathophysiology of lung cancer is multifaceted, and it includes multiple cell signaling pathways and other complex factors such as oxidative stress and genetics. The association of HPV with lung carcinogenesis was first proposed in 1979, and since then, scientists worldwide have been putting forward several hypotheses to establish a relationship between this virus and lung cancer. Although studies have reported the presence of HPV in lung cancer, the exact mechanism of entry and the route of transmission have not been elucidated clearly till date. Numerous studies across the globe have detected differentially expressed HPV oncoproteins in lung cancer patients and found their association with the critical cell signaling pathways that leads to the development and progression of lung cancer. Many reports have also provided evidence stating the involvement of HPV in determining the survival status of lung cancer patients. The present review recapitulates the studies evincing the association of HPV and lung cancer, its route of transmission and mechanism of action; the detection of the virus and treatment opportunities for HPV-positive lung cancer; and the severity associated with this disease. Therefore, this will provide an explicit idea and would help to develop preventive measures and specific as well as effective treatment for HPV-associated lung carcinogenesis.
Collapse
Affiliation(s)
- Dey Parama
- Cancer Biology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - Bandari BharathwajChetty
- Cancer Biology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - Sujitha Jayaprakash
- Cancer Biology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - E Hui Clarissa Lee
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117600, Singapore; NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Elina Khatoon
- Cancer Biology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - Mohammed S Alqahtani
- Radiological Sciences Department, College of Applied Medical Sciences, King Khalid University, Abha 61421, Saudi Arabia; BioImaging Unit, Space Research Centre, Michael Atiyah Building, University of Leicester, Leicester, LE1 7RH, U.K
| | - Mohamed Abbas
- Electrical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia
| | - Alan Prem Kumar
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117600, Singapore; NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore.
| | - Ajaikumar B Kunnumakkara
- Cancer Biology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India.
| |
Collapse
|
3
|
Santos DL, São Marcos BDF, de Sousa GF, Cruz LCDO, Barros BRDS, Nogueira MCDBL, Oliveira THDA, Silva AJD, Santos VEP, de Melo CML, de Freitas AC. Immunological Response against Breast Lineage Cells Transfected with Human Papillomavirus (HPV). Viruses 2024; 16:717. [PMID: 38793599 PMCID: PMC11125976 DOI: 10.3390/v16050717] [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: 03/18/2024] [Revised: 04/15/2024] [Accepted: 04/29/2024] [Indexed: 05/26/2024] Open
Abstract
Breast cancer is the most common neoplasm worldwide. Viral infections are involved with carcinogenesis, especially those caused by oncogenic Human Papillomavirus (HPV) genotypes. Despite the detection of HPV in breast carcinomas, the virus's activity against this type of cancer remains controversial. HPV infection promotes remodeling of the host's immune response, resulting in an immunosuppressive profile. This study assessed the individual role of HPV oncogenes in the cell line MDA-MB-231 transfected with the E5, E6, and E7 oncogenes and co-cultured with peripheral blood mononuclear cells. Immunophenotyping was conducted to evaluate immune system modulation. There was an increase in CD4+ T cell numbers when compared with non-transfected and transfected MDA-MB-231, especially in the Treg profile. Pro-inflammatory intracellular cytokines, such as IFN-γ, TNF-α, and IL-17, were impaired by transfected cells, and a decrease in the cytolytic activity of the CD8+ and CD56+ lymphocytes was observed in the presence of HPV oncogenes, mainly with E6 and E7. The E6 and E7 oncogenes decrease monocyte expression, activating the expected M1 profile. In the monocytes found, a pro-inflammatory role was observed according to the cytokines released in the supernatant. In conclusion, the MDA-MB-231 cell lineage transfected with HPV oncogenes can downregulate the number and function of lymphocytes and monocytes.
Collapse
Affiliation(s)
- Daffany Luana Santos
- Laboratory of Molecular Studies and Experimental Therapy, Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (D.L.S.); (B.d.F.S.M.); (A.J.D.S.); (V.E.P.S.)
| | - Bianca de França São Marcos
- Laboratory of Molecular Studies and Experimental Therapy, Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (D.L.S.); (B.d.F.S.M.); (A.J.D.S.); (V.E.P.S.)
| | - Georon Ferreira de Sousa
- Keizo Asami Immunopathology Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (G.F.d.S.); (L.C.d.O.C.); (B.R.d.S.B.); (M.C.d.B.L.N.); (C.M.L.d.M.)
- Department of Antibiotics, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Leonardo Carvalho de Oliveira Cruz
- Keizo Asami Immunopathology Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (G.F.d.S.); (L.C.d.O.C.); (B.R.d.S.B.); (M.C.d.B.L.N.); (C.M.L.d.M.)
- Department of Antibiotics, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Bárbara Rafaela da Silva Barros
- Keizo Asami Immunopathology Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (G.F.d.S.); (L.C.d.O.C.); (B.R.d.S.B.); (M.C.d.B.L.N.); (C.M.L.d.M.)
- Department of Antibiotics, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Mariane Cajuba de Britto Lira Nogueira
- Keizo Asami Immunopathology Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (G.F.d.S.); (L.C.d.O.C.); (B.R.d.S.B.); (M.C.d.B.L.N.); (C.M.L.d.M.)
- Vitória Academic Center, Federal University of Pernambuco, Rua do Alto do Reservatório s/n, Bela Vista, Vitória de Santo Antão 55608-680, Pernambuco, Brazil
| | | | - Anna Jessica Duarte Silva
- Laboratory of Molecular Studies and Experimental Therapy, Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (D.L.S.); (B.d.F.S.M.); (A.J.D.S.); (V.E.P.S.)
| | - Vanessa Emanuelle Pereira Santos
- Laboratory of Molecular Studies and Experimental Therapy, Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (D.L.S.); (B.d.F.S.M.); (A.J.D.S.); (V.E.P.S.)
| | - Cristiane Moutinho Lagos de Melo
- Keizo Asami Immunopathology Laboratory, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (G.F.d.S.); (L.C.d.O.C.); (B.R.d.S.B.); (M.C.d.B.L.N.); (C.M.L.d.M.)
- Department of Antibiotics, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Antonio Carlos de Freitas
- Laboratory of Molecular Studies and Experimental Therapy, Department of Genetics, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235. Cidade Universitária, Recife 50670-901, Pernambuco, Brazil; (D.L.S.); (B.d.F.S.M.); (A.J.D.S.); (V.E.P.S.)
| |
Collapse
|
4
|
High-Risk Human Papillomavirus Infection in Lung Cancer: Mechanisms and Perspectives. BIOLOGY 2022; 11:biology11121691. [PMID: 36552201 PMCID: PMC9775033 DOI: 10.3390/biology11121691] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/08/2022] [Accepted: 11/16/2022] [Indexed: 11/24/2022]
Abstract
Lung cancer is a very prevalent and heterogeneous group of malignancies, and most of them are etiologically associated with tobacco smoking. However, viral infections have been detected in lung carcinomas, with high-risk human papillomaviruses (HR-HPVs) being among them. The role of HR-HPVs in lung cancer has been considered to be controversial. This issue is due to the highly variable presence of this virus in lung carcinomas worldwide, and the low viral load frequently that is detected. In this review, we address the epidemiological and mechanistic findings regarding the role of HR-HPVs in lung cancer. Some mechanisms of HR-HPV-mediated lung carcinogenesis have been proposed, including (i) HPV works as an independent carcinogen in non-smoker subjects; (ii) HPV cooperates with carcinogenic compounds present in tobacco smoke; (iii) HPV promotes initial alterations being after cleared by the immune system through a "hit and run" mechanism. Additional research is warranted to clarify the role of HPV in lung cancer.
Collapse
|
5
|
Dai L, Wang X, Bai T, Liu J, Chen B, Li T, Yang W. Identification of a novel cellular senescence-related signature for the prediction of prognosis and immunotherapy response in colon cancer. Front Genet 2022; 13:961554. [PMID: 35991564 PMCID: PMC9386482 DOI: 10.3389/fgene.2022.961554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2022] [Accepted: 07/11/2022] [Indexed: 11/24/2022] Open
Abstract
The study was conducted to construct a cellular senescence-related risk score signature to predict prognosis and immunotherapy response in colon cancer. Colon cancer data were acquired from the Gene Expression Omnibus and The Cancer Genome Atlas databases. And cellular senescence-related genes were obtained from the CellAge database. The colon cancer data were classified into different clusters based on cellular senescence-related gene expression. Next, prognostic differential genes among clusters were identified with survival analysis. A cellular senescence-related risk score signature was developed by performing the LASSO regression analysis. Finally, PCA analysis, t-SNE analysis, Kaplan-Meier survival analysis, ROC analysis, univariate Cox regression analysis, multivariate Cox regression analysis, C-index analysis, meta-analysis, immune infiltration analysis, and IPS score analysis were used to evaluate the significance of the risk signature for predicting prognosis and immunotherapy response in colon cancer. The colon cancer data were classified into three clusters. The patients in cluster A and cluster B had longer survival. A cellular senescence-related risk score signature was developed. Patients in the low-risk score group showed a better prognosis. The risk score signature could predict colon cancer patients’ prognosis independently of other clinical characteristics. The risk score signature predicted the prognosis of colon cancer patients more accurately than other signatures. Patients in the low-risk score group showed a better response to immunotherapy. The opposite was true for the high-risk score group. In conclusion, the cellular senescence-related risk score signature could be used for the prediction of prognosis and immunotherapy response in colon cancer.
Collapse
|
6
|
Carper MB, Goel S, Zhang AM, Damrauer JS, Cohen S, Zimmerman MP, Gentile GM, Parag-Sharma K, Murphy RM, Sato K, Nickel KP, Kimple RJ, Yarbrough WG, Amelio AL. Activation of the CREB Coactivator CRTC2 by Aberrant Mitogen Signaling promotes oncogenic functions in HPV16 positive head and neck cancer. Neoplasia 2022; 29:100799. [PMID: 35504112 PMCID: PMC9065880 DOI: 10.1016/j.neo.2022.100799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 04/14/2022] [Accepted: 04/14/2022] [Indexed: 02/07/2023]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is the 6th most common cancer worldwide and incidence rates are continuing to rise globally. Patients often present with locally advanced disease and a staggering 50% chance of relapse following treatment. Aberrant activation of adaptive response signaling pathways, such as the cAMP/PKA pathway, induce an array of genes associated with known cancer pathways that promote tumorigenesis and drug resistance. We identified the cAMP Regulated Transcription Coactivator 2 (CRTC2) to be overexpressed and constitutively activated in HNSCCs and this confers poor prognosis. CRTCs are regulated through their subcellular localization and we show that CRTC2 is exclusively nuclear in HPV(+) HNSCC, thus constitutively active, due to non-canonical Mitogen-Activated Kinase Kinase 1 (MEKK1)-mediated activation via a MEKK1-p38 signaling axis. Loss-of-function and pharmacologic inhibition experiments decreased CRTC2/CREB transcriptional activity by reducing nuclear CRTC2 via nuclear import inhibition and/or by eviction of CRTC2 from the nucleus. This shift in localization was associated with decreased proliferation, migration, and invasion. Our results suggest that small molecules that inhibit nuclear CRTC2 and p38 activity may provide therapeutic benefit to patients with HPV(+) HNSCC.
Collapse
Affiliation(s)
- Miranda B Carper
- Lineberger Comprehensive Cancer Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Saumya Goel
- Oral and Craniofacial Health Sciences, Adams School of Dentistry, The University of North Carolina at Chapel Hill, NC, USA; Carolina Research Scholar, Undergraduate Curriculum in Biochemistry, The University of North Carolina at Chapel Hill, NC, USA
| | - Anna M Zhang
- Oral and Craniofacial Health Sciences, Adams School of Dentistry, The University of North Carolina at Chapel Hill, NC, USA
| | - Jeffrey S Damrauer
- Lineberger Comprehensive Cancer Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Stephanie Cohen
- Pathology Services Core, Lineberger Comprehensive Cancer Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, Chapel Hill, NC, USA
| | - Matthew P Zimmerman
- Graduate Curriculum in Genetics & Molecular Biology, Biological & Biomedical Sciences Program, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Gabrielle M Gentile
- Graduate Curriculum in Genetics & Molecular Biology, Biological & Biomedical Sciences Program, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Kshitij Parag-Sharma
- Graduate Curriculum in Cell Biology & Physiology, Biological & Biomedical Sciences Program, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Ryan M Murphy
- Graduate Curriculum in Pharmacology, Biological & Biomedical Sciences Program, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA
| | - Kotaro Sato
- Lineberger Comprehensive Cancer Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA; Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Nagoya University, Nagoya, Japan
| | - Kwangok P Nickel
- Department of Human Oncology and UW Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Randall J Kimple
- Department of Human Oncology and UW Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin, Madison, WI, USA
| | - Wendell G Yarbrough
- Lineberger Comprehensive Cancer Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA; Department of Otolaryngology/Head and Neck Surgery, University of North Carolina School of Medicine, Chapel Hill, North Carolina, Chapel Hill, NC, USA; Department of Pathology, University of North Carolina School of Medicine, Chapel Hill, North Carolina, Chapel Hill, NC, USA
| | - Antonio L Amelio
- Department of Cell Biology and Physiology, UNC School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Biomedical Research Imaging Center, UNC School of Medicine, The University of North Carolina at Chapel Hill, NC, USA; Lineberger Comprehensive Cancer Center, Cancer Cell Biology Program, UNC School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
| |
Collapse
|
7
|
Blasius TL, Yue Y, Prasad R, Liu X, Gennerich A, Verhey KJ. Sequences in the stalk domain regulate auto-inhibition and ciliary tip localization of the immotile kinesin-4 KIF7. J Cell Sci 2021; 134:269104. [PMID: 34114033 DOI: 10.1242/jcs.258464] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 05/27/2021] [Indexed: 12/31/2022] Open
Abstract
The kinesin-4 member KIF7 plays critical roles in Hedgehog signaling in vertebrate cells. KIF7 is an atypical kinesin as it binds to microtubules but is immotile. We demonstrate that, like conventional kinesins, KIF7 is regulated by auto-inhibition, as the full-length protein is inactive for microtubule binding in cells. We identify a segment, the inhibitory coiled coil (inhCC), that is required for auto-inhibition of KIF7, whereas the adjacent regulatory coiled coil (rCC) that contributes to auto-inhibition of the motile kinesin-4s KIF21A and KIF21B is not sufficient for KIF7 auto-inhibition. Disease-associated mutations in the inhCC relieve auto-inhibition and result in strong microtubule binding. Surprisingly, uninhibited KIF7 proteins did not bind preferentially to or track the plus ends of growing microtubules in cells, as suggested by previous in vitro work, but rather bound along cytosolic and axonemal microtubules. Localization to the tip of the primary cilium also required the inhCC, and could be increased by disease-associated mutations regardless of the auto-inhibition state of the protein. These findings suggest that loss of KIF7 auto-inhibition and/or altered cilium tip localization can contribute to the pathogenesis of human disease.
Collapse
Affiliation(s)
- T Lynne Blasius
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Yang Yue
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - RaghuRam Prasad
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Xinglei Liu
- Department of Anatomy and Structural Biology and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Arne Gennerich
- Department of Anatomy and Structural Biology and Gruss-Lipper Biophotonics Center, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Kristen J Verhey
- Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| |
Collapse
|