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Nowak J, Lenartowski R, Kalita K, Lehka L, Karatsai O, Lenartowska M, Rędowicz MJ. Myosin VI in the nucleolus of neurosecretory PC12 cells: its involvement in the maintenance of nucleolar structure and ribosome organization. Front Physiol 2024; 15:1368416. [PMID: 38774650 PMCID: PMC11106421 DOI: 10.3389/fphys.2024.1368416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 04/01/2024] [Indexed: 05/24/2024] Open
Abstract
We have previously shown that unconventional myosin VI (MVI), a unique actin-based motor protein, shuttles between the cytoplasm and nucleus in neurosecretory PC12 cells in a stimulation-dependent manner and interacts with numerous proteins involved in nuclear processes. Among the identified potential MVI partners was nucleolin, a major nucleolar protein implicated in rRNA processing and ribosome assembly. Several other nucleolar proteins such as fibrillarin, UBF (upstream binding factor), and B23 (also termed nucleophosmin) have been shown to interact with MVI. A bioinformatics tool predicted the presence of the nucleolar localization signal (NoLS) within the MVI globular tail domain, and immunostaining confirmed the presence of MVI within the nucleolus. Depletion of MVI, previously shown to impair PC12 cell proliferation and motility, caused disorganization of the nucleolus and rough endoplasmic reticulum (rER). However, lack of MVI does not affect nucleolar transcription. In light of these data, we propose that MVI is important for nucleolar and ribosome maintenance but not for RNA polymerase 1-related transcription.
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Affiliation(s)
- Jolanta Nowak
- Laboratory of Molecular Basis of Cell Motility, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Robert Lenartowski
- Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Torun, Torun, Poland
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, Torun, Poland
| | - Katarzyna Kalita
- Laboratory of Neurobiology, Nencki-EMBL Partnership for Neural Plasticity and Brain Disorders—BRAINCITY, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Lilya Lehka
- Laboratory of Molecular Basis of Cell Motility, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Olena Karatsai
- Laboratory of Molecular Basis of Cell Motility, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Marta Lenartowska
- Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University in Torun, Torun, Poland
- Centre for Modern Interdisciplinary Technologies, Nicolaus Copernicus University in Torun, Torun, Poland
| | - Maria Jolanta Rędowicz
- Laboratory of Molecular Basis of Cell Motility, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
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Mahmud S, Hamza A, Lee YB, Min JK, Islam R, Dogsom O, Park JB. Lipopolysaccharide Stimulates A549 Cell Migration through p-Tyr 42 RhoA and Phospholipase D1 Activity. Biomolecules 2023; 14:6. [PMID: 38275747 PMCID: PMC10813223 DOI: 10.3390/biom14010006] [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: 11/26/2023] [Revised: 12/13/2023] [Accepted: 12/18/2023] [Indexed: 01/27/2024] Open
Abstract
Cell migration is a crucial contributor to metastasis, a critical process associated with the mortality of cancer patients. The initiation of metastasis is triggered by epithelial-mesenchymal transition (EMT), along with the changes in the expression of EMT marker proteins. Inflammation plays a significant role in carcinogenesis and metastasis. Lipopolysaccharide (LPS), a typical inflammatory agent, promoted the generation of superoxide through the activation of p-Tyr42 RhoA, Rho-dependent kinase 2 (ROCK2), and the phosphorylation of p47phox. In addition, p-Tyr42 RhoA activated phospholipase D1 (PLD1), with PLD1 and phosphatidic acid (PA) being involved in superoxide production. PA also regulated the expression of EMT proteins. Consequently, we have identified MHY9 (Myosin IIA, NMIIA) as a PA-binding protein in response to LPS. MYH9 also contributed to cell migration and the alteration in the expression of EMT marker proteins. Co-immunoprecipitation revealed the formation of a complex involving p-Tyr42 RhoA, PLD1, and MYH9. These proteins were found to be distributed in both the cytosol and nucleus. In addition, we have found that p-Tyr42 RhoA PLD1 and MYH9 associate with the ZEB1 promoter. The suppression of ZEB1 mRNA levels was achieved through the knockdown of RhoA, PLD1, and MYH9 using si-RNAs. Taken together, we propose that p-Tyr42 RhoA and PLD1, responsible for producing PA, and PA-bound MYH9 are involved in the regulation of ZEB1 expression, thereby promoting cell migration.
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Affiliation(s)
- Shohel Mahmud
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
- National Institute of Biotechnology, Ganakbari, Ashulia, Savar, Dhaka 1349, Bangladesh
| | - Amir Hamza
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
| | - Yoon-Beom Lee
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
| | - Jung-Ki Min
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
| | - Rokibul Islam
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
- Department of Biotechnology and Genetic Engineering, Faculty of Biological Science, Islamic University, Kushtia 7003, Bangladesh
| | - Oyungerel Dogsom
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
- Department of Biology, School of Bio-Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14210, Mongolia
| | - Jae-Bong Park
- Department of Biochemistry, College of Medicine, Hallym University, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (S.M.); (A.H.); (Y.-B.L.); (J.-K.M.); (R.I.); (O.D.)
- Institute of Cell Differentiation and Aging, College of Medicine, Hallym University, Chuncheon 24252, Kangwon-do, Republic of Korea
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