1
|
Roilo M, Kullmann MK, Hengst L. Cold-inducible RNA-binding protein (CIRP) induces translation of the cell-cycle inhibitor p27Kip1. Nucleic Acids Res 2019; 46:3198-3210. [PMID: 29361038 PMCID: PMC5888589 DOI: 10.1093/nar/gkx1317] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 01/11/2018] [Indexed: 01/10/2023] Open
Abstract
The CDK inhibitor p27Kip1 plays a central role in controlling cell proliferation and cell-cycle exit. p27Kip1 protein levels oscillate during cell-cycle progression and are regulated by mitogen or anti-proliferative signaling. The abundance of the protein is frequently determined by post-transcriptional mechanisms including ubiquitin-mediated proteolysis and translational control. Here, we report that the cold-inducible RNA-binding protein (CIRP) selectively binds to the 5′ untranslated region of the p27Kip1 mRNA. CIRP is induced, modified and relocalized in response to various stress stimuli and can regulate cell survival and cell proliferation particularly during stress. Binding of CIRP to the 5′UTR of the p27Kip1 mRNA significantly enhanced reporter translation. In cells exposed to mild hypothermia, the induction of CIRP correlated with increased translation of a p27Kip1 5′UTR reporter and with the accumulation of p27Kip1 protein. shRNA-mediated CIRP knockdown could prevent the induction of translation. We found that p27Kip1 is central for the decreased proliferation at lower temperature, since p27Kip1 KO mouse embryonic fibroblasts (MEFs) hardly increased their doubling time in hypothermic conditions, whereas wild-type MEFs significantly delayed proliferation in response to cold stress. This suggests that the CIRP-dependent p27Kip1 upregulation during mild hypothermia contributes to the cold shock-induced inhibition of cell proliferation.
Collapse
Affiliation(s)
- Martina Roilo
- Division of Medical Biochemistry, Biocenter, Medical University of Innsbruck, Innsbruck 6020, Austria
| | - Michael K Kullmann
- Division of Medical Biochemistry, Biocenter, Medical University of Innsbruck, Innsbruck 6020, Austria
| | - Ludger Hengst
- Division of Medical Biochemistry, Biocenter, Medical University of Innsbruck, Innsbruck 6020, Austria
| |
Collapse
|
2
|
Wu X, Li G, Gao P, Luo K, Zhou H, He Y, Yuan H. Multiple functions of cold-inducible RNA-binding protein in biological systems. VASCULAR INVESTIGATION AND THERAPY 2019. [DOI: 10.4103/vit.vit_13_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
|
3
|
Recent progress in the research of cold-inducible RNA-binding protein. Future Sci OA 2017; 3:FSO246. [PMID: 29134130 PMCID: PMC5674272 DOI: 10.4155/fsoa-2017-0077] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 08/16/2017] [Indexed: 12/22/2022] Open
Abstract
Cold-inducible RNA-binding protein (CIRP) is a cold-shock protein which can be induced after exposure to a moderate cold-shock in different species ranging from amphibians to humans. Expression of CIRP can also be regulated by hypoxia, UV radiation, glucose deprivation, heat stress and H2O2, suggesting that CIRP is a general stress-response protein. In response to stress, CIRP can migrate from the nucleus to the cytoplasm and regulate mRNA stability through its binding site on the 3'-UTR of its targeted mRNAs. Through the regulation of its targets, CIRP has been implicated in multiple cellular process such as cell proliferation, cell survival, circadian modulation, telomere maintenance and tumor formation and progression. In addition, CIRP can also exert its functions by directly interacting with intracellular signaling proteins. Moreover, CIRP can be secreted out of cells. Extracellular CIRP functions as a damage-associated molecular pattern to promote inflammatory responses and plays an important role in both acute and chronic inflammatory diseases. Here, we summarize novel findings of CIRP investigation and hope to provide insights into the role of CIRP in cell biology and diseases.
Collapse
|
4
|
Golabgir A, Gutierrez JM, Hefzi H, Li S, Palsson BO, Herwig C, Lewis NE. Quantitative feature extraction from the Chinese hamster ovary bioprocess bibliome using a novel meta-analysis workflow. Biotechnol Adv 2016; 34:621-633. [DOI: 10.1016/j.biotechadv.2016.02.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Revised: 02/21/2016] [Accepted: 02/28/2016] [Indexed: 01/01/2023]
|
5
|
Wang M, Zhang H, Heng X, Pang Q, Sun A. Expression of cold-inducible RNA-binding protein (CIRP) in pituitary adenoma and its relationships with tumor recurrence. Med Sci Monit 2015; 21:1256-60. [PMID: 25934796 PMCID: PMC4428314 DOI: 10.12659/msm.893128] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The aim of this study was to detect the expression of cold-inducible RNA-binding protein in pituitary adenoma and to determine its effects on tumor recurrence. MATERIAL/METHODS We collected a total of 60 post-op samples collected from pituitary adenoma patients (including 20 cases of invasive pituitary adenoma, 20 cases of non-invasive adenoma, and 20 cases of non-invasive recurrent adenoma) admitted in our hospital. Both protein and mRNA levels of CIRP in 3 types of pituitary adenoma samples were quantified by Western blotting and real-time PCR, respectively. RESULTS Western blotting revealed significantly elevated CIRP expression levels in invasive pituitary adenoma compared to non-invasive tumors, with statistical significance (p<0.05). Recurrent pituitary adenoma expressed significantly higher CIRP levels compared to non-recurrent tumors (p<0.05). Real-time PCR for CIRP mRNA obtained consistent results: transcript levels were significantly higher in invasive pituitary adenoma compared to non-invasive adenoma (p<0.05); recurrent adenoma also had significantly higher CIRP mRNA levels compared to non-recurrent tumors (p<0.05). Among all 3 types of pituitary adenoma, recurrent tumors had the highest levels of CIRP mRNA and protein. CONCLUSIONS The expression of CIRP in pituitary adenoma is closely related with tumor proliferation and invasion, and its significantly elevated expression level indicates post-op recurrence.
Collapse
Affiliation(s)
- Mingguang Wang
- Department of Neurosurgery, Shandong Provincial Hospital, Shandong University, Jinan, Shandong, P.R. China
- Department of Neurosurgery, People’s Hospital of Linyi, Linyi, Shandong, P.R. China
| | - Huan Zhang
- Department of Neurosurgery, People’s Hospital of Linyi, Linyi, Shandong, P.R. China
| | - Xueyuan Heng
- Department of Neurosurgery, People’s Hospital of Linyi, Linyi, Shandong, P.R. China
| | - Qi Pang
- Department of Neurosurgery, Shandong Provincial Hospital, Shandong University, Jinan, Shandong, P.R. China
| | - Aigang Sun
- Department of Neurosurgery, People’s Hospital of Linyi, Linyi, Shandong, P.R. China
- Corresponding Author: Aigang Sun, e-mail:
| |
Collapse
|
6
|
Tang C, Wang Y, Lan D, Feng X, Zhu X, Nie P, Yue H. Analysis of gene expression profiles reveals the regulatory network of cold-inducible RNA-binding protein mediating the growth of BHK-21 cells. Cell Biol Int 2015; 39:678-89. [DOI: 10.1002/cbin.10438] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 01/09/2015] [Indexed: 01/28/2023]
Affiliation(s)
- Cheng Tang
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| | - Yuanwei Wang
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| | - Daoliang Lan
- Institute of Qinghai-Tibetan Plateau; Southwest University for Nationalities; Chengdu 610041 China
| | - Xiaohui Feng
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| | - Xin Zhu
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| | - Peiting Nie
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| | - Hua Yue
- College of Life Science and Technology; Southwest University for Nationalities; Chengdu 610041 China
| |
Collapse
|
7
|
Du G, Zhao B, Zhang Y, Sun T, Liu W, Li J, Liu Y, Wang Y, Li H, Hou X. Hypothermia activates adipose tissue to promote malignant lung cancer progression. PLoS One 2013; 8:e72044. [PMID: 24015203 PMCID: PMC3754995 DOI: 10.1371/journal.pone.0072044] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 07/03/2013] [Indexed: 12/29/2022] Open
Abstract
Microenvironment has been increasingly recognized as a critical regulator of cancer progression. In this study, we identified early changes in the microenvironment that contribute to malignant progression. Exposure of human bronchial epithelial cells (BEAS-2B) to methylnitrosourea (MNU) caused a reduction in cell toxicity and an increase in clonogenic capacity when the temperature was lowered from 37°C to 28°C. Hypothermia-incubated adipocyte media promoted proliferation in A549 cells. Although a hypothermic environment could increase urethane-induced tumor counts and Lewis lung cancer (LLC) metastasis in lungs of three breeds of mice, an increase in tumor size could be discerned only in obese mice housed in hypothermia. Similarly, coinjections using differentiated adipocytes and A549 cells promoted tumor development in athymic nude mice when adipocytes were cultured at 28°C. Conversely, fat removal suppressed tumor growth in obese C57BL/6 mice inoculated with LLC cells. Further studies show hypothermia promotes a MNU-induced epithelial-mesenchymal transition (EMT) and protects the tumor cell against immune control by TGF-β1 upregulation. We also found that activated adipocytes trigger tumor cell proliferation by increasing either TNF-α or VEGF levels. These results suggest that hypothermia activates adipocytes to stimulate tumor boost and play critical determinant roles in malignant progression.
Collapse
Affiliation(s)
- Gangjun Du
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
- * E-mail:
| | - Bei Zhao
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Yaping Zhang
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Ting Sun
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Weijie Liu
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Jiahuan Li
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Yinghui Liu
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Yingying Wang
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Hong Li
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| | - Xidong Hou
- Institute of Pharmacy, Pharmaceutical College of Henan University, Jinming District, Kaifeng, Henan, China
| |
Collapse
|
8
|
Brochu C, Cabrita MA, Melanson BD, Hamill JD, Lau R, Pratt MAC, McKay BC. NF-κB-dependent role for cold-inducible RNA binding protein in regulating interleukin 1β. PLoS One 2013; 8:e57426. [PMID: 23437386 PMCID: PMC3578848 DOI: 10.1371/journal.pone.0057426] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Accepted: 01/21/2013] [Indexed: 12/31/2022] Open
Abstract
The cold inducible RNA binding protein (CIRBP) responds to a wide array of cellular stresses, including short wavelength ultraviolet light (UVC), at the transcriptional and post-translational level. CIRBP can bind the 3'untranslated region of specific transcripts to stabilize them and facilitate their transport to ribosomes for translation. Here we used RNA interference and oligonucleotide microarrays to identify potential downstream targets of CIRBP induced in response to UVC. Twenty eight transcripts were statistically increased in response to UVC and these exhibited a typical UVC response. Only 5 of the 28 UVC-induced transcripts exhibited a CIRBP-dependent pattern of expression. Surprisingly, 3 of the 5 transcripts (IL1B, IL8 and TNFAIP6) encoded proteins important in inflammation with IL-1β apparently contributing to IL8 and TNFAIP6 expression in an autocrine fashion. UVC-induced IL1B expression could be inhibited by pharmacological inhibition of NFκB suggesting that CIRBP was affecting NF-κB signaling as opposed to IL1B mRNA stability directly. Bacterial lipopolysaccharide (LPS) was used as an activator of NF-κB to further study the potential link between CIRBP and NFκB. Transfection of siRNAs against CIRBP reduced the extent of the LPS-induced phosphorylation of IκBα, NF-κB DNA binding activity and IL-1β expression. The present work firmly establishes a novel link between CIRBP and NF-κB signaling in response to agents with diverse modes of action. These results have potential implications for disease states associated with inflammation.
Collapse
Affiliation(s)
- Christian Brochu
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Miguel A. Cabrita
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
| | - Brian D. Melanson
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
| | - Jeffrey D. Hamill
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Ottawa, Canada
| | - Rosanna Lau
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
| | | | - Bruce C. McKay
- Cancer Therapeutics Program, Ottawa Hospital Research Institute, Ottawa, Canada
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
- Department of Biology, Carleton University, Ottawa, Canada
- * E-mail:
| |
Collapse
|
9
|
Masuda T, Itoh K, Higashitsuji H, Higashitsuji H, Nakazawa N, Sakurai T, Liu Y, Tokuchi H, Fujita T, Zhao Y, Nishiyama H, Tanaka T, Fukumoto M, Ikawa M, Okabe M, Fujita J. Cold-inducible RNA-binding protein (Cirp) interacts with Dyrk1b/Mirk and promotes proliferation of immature male germ cells in mice. Proc Natl Acad Sci U S A 2012; 109:10885-90. [PMID: 22711815 PMCID: PMC3390833 DOI: 10.1073/pnas.1121524109] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Cold-inducible RNA-binding protein (Cirp) was the first cold-shock protein identified in mammals. It is structurally quite different from bacterial cold-shock proteins and is induced in response to mild, but not severe, hypothermia. To clarify the physiological function of Cirp in vivo, we produced cirp-knockout mice. They showed neither gross abnormality nor defect in fertility, but the number of undifferentiated spermatogonia was significantly reduced and the recovery of spermatogenesis was delayed after treatment with a cytotoxic agent, busulfan. Cirp accelerated cell-cycle progression from G0 to G1 as well as from G1 to S phase in cultured mouse embryonic fibroblasts. Cirp directly bound to dual-specificity tyrosine-phosphorylation-regulated kinase 1B (Dyrk1b, also called Mirk) and inhibited its binding to p27, resulting in decreased phosphorylation and destabilization of p27. Cirp did not affect binding of Dyrk1b to cyclin D1 but inhibited phosphorylation of cyclin D1 by Dyrk1b, resulting in cyclin D1 stabilization. In the spermatogonial cell line GC-1spg, suppression of Cirp expression increased the protein level of p27, decreased that of cyclin D1, and decreased the growth rate, which depended on Dyrk1b. Consistent changes in the protein levels of p27 and cyclin D1 as well as the percentage of cells in G0 phase were observed in undifferentiated spermatogonia of cirp-knockout mice. In undifferentiated spermatogonia of wild-type mice, Cirp and Dyrk1b colocalized in the nucleus. Thus, our study demonstrates that Cirp functions to fine-tune the proliferation of undifferentiated spermatogonia by interacting with Dyrk1b.
Collapse
Affiliation(s)
- Tomoko Masuda
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Katsuhiko Itoh
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hiroaki Higashitsuji
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hisako Higashitsuji
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Noa Nakazawa
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Toshiharu Sakurai
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Yu Liu
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hiromu Tokuchi
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Takanori Fujita
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Yan Zhao
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Hiroyuki Nishiyama
- Department of Urology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba 3058575, Japan
| | - Takashi Tanaka
- Department of Molecular Genetics, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| | - Manabu Fukumoto
- Department of Pathology, Institute of Development, Aging, and Cancer, Tohoku University, Sendai 980-8575, Japan; and
| | - Masahito Ikawa
- Department of Experimental Genome Research, Genome Information Research Center, Osaka University, Osaka 565-0871, Japan
| | - Masaru Okabe
- Department of Experimental Genome Research, Genome Information Research Center, Osaka University, Osaka 565-0871, Japan
| | - Jun Fujita
- Department of Clinical Molecular Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan
| |
Collapse
|
10
|
|
11
|
Sunley K, Butler M. Strategies for the enhancement of recombinant protein production from mammalian cells by growth arrest. Biotechnol Adv 2010; 28:385-94. [DOI: 10.1016/j.biotechadv.2010.02.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2009] [Revised: 02/04/2010] [Accepted: 02/08/2010] [Indexed: 12/31/2022]
|
12
|
Sunley K, Tharmalingam T, Butler M. CHO cells adapted to hypothermic growth produce high yields of recombinant β-interferon. Biotechnol Prog 2008; 24:898-906. [DOI: 10.1002/btpr.9] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
13
|
Mohan C, Kim YG, Koo J, Lee GM. Assessment of cell engineering strategies for improved therapeutic protein production in CHO cells. Biotechnol J 2008; 3:624-30. [PMID: 18293320 DOI: 10.1002/biot.200700249] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Recombinant glycoprotein therapeutics have proven to be invaluable pharmaceuticals for the treatment of various diseases. Chinese hamster ovary (CHO) cells are widely used in industry for the production of these proteins. Several strategies for engineering CHO cells for improved protein production have been tried with considerable results. The focus has mainly been to increase the specific productivity and to extend the culture longevity by preventing programmed cell death. These CHO cell engineering strategies, particularly those developed in Korea, are reviewed here.
Collapse
Affiliation(s)
- Chaya Mohan
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejon, Korea
| | | | | | | |
Collapse
|
14
|
The cold-inducible RNA-binding protein migrates from the nucleus to cytoplasmic stress granules by a methylation-dependent mechanism and acts as a translational repressor. Exp Cell Res 2007; 313:4130-44. [PMID: 17967451 DOI: 10.1016/j.yexcr.2007.09.017] [Citation(s) in RCA: 187] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2007] [Revised: 08/27/2007] [Accepted: 09/24/2007] [Indexed: 01/09/2023]
Abstract
The cold-inducible RNA-binding protein (CIRP) is a nuclear 18-kDa protein consisting of an amino-terminal RNA Recognition Motif (RRM) and a carboxyl-terminal domain containing several RGG motifs. First characterized for its overexpression upon cold shock, CIRP is also induced by stresses such as UV irradiation and hypoxia. Here, we investigated the expression as well as the subcellular localization of CIRP in response to other stress conditions. We demonstrate that oxidative stress leads to the migration of CIRP to stress granules (SGs) without alteration of expression. Stress granules are dynamic cytoplasmic foci at which stalled translation initiation complexes accumulate in cells subjected to environmental stress. Relocalization of CIRP into SGs also occurs upon other cytoplasmic stresses (osmotic pressure or heat shock) as well as in response to stresses of the endoplasmic reticulum. CIRP migration into SGs is independent from TIA-1 which has been previously reported to be a general mediator of SG formation, thereby suggesting the existence of multiple pathways leading to SG formation. Moreover, deletion mutants revealed that both RGG and RRM domains can independently promote CIRP migration into SGs. However, the methylation of arginine residues in the RGG domain is necessary for CIRP to exit the nucleus to be further recruited into SGs. By RNA-tethering experiments, we also show that CIRP down-regulates mRNA translation and that this activity is carried by the carboxyl-terminal RG-enriched domain. Altogether, our findings further reveal the diversity of mechanisms by which CIRP is regulated by environmental stresses and provide new insights into CIRP cytoplasmic function.
Collapse
|