Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells
Prostate cancer (PCa) is the major cause of cancer-related death among aging men worldwide. Recent studies have suggested that calreticulin (CRT), a multifunctional chaperon protein, may play an important role in the regulation of PCa tumorigenesis and progression. However, the underlying mechanisms...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-03-01
|
| Series: | Biomedicines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2227-9059/10/3/646 |
| _version_ | 1797472672326615040 |
|---|---|
| author | Yueh-Chien Lin Yuan-Li Huang Ming-Hua Wang Chih-Yu Chen Wei-Min Chen Yi-Cheng Weng Pei-Yi Wu |
| author_facet | Yueh-Chien Lin Yuan-Li Huang Ming-Hua Wang Chih-Yu Chen Wei-Min Chen Yi-Cheng Weng Pei-Yi Wu |
| author_sort | Yueh-Chien Lin |
| collection | DOAJ |
| description | Prostate cancer (PCa) is the major cause of cancer-related death among aging men worldwide. Recent studies have suggested that calreticulin (CRT), a multifunctional chaperon protein, may play an important role in the regulation of PCa tumorigenesis and progression. However, the underlying mechanisms are still unclear. Integrin is an important regulator of cancer metastasis. Our previous study demonstrated that in J82 bladder cancer cells, CRT affects integrin activity through FUBP-1-FUT-1-dependent fucosylation, rather than directly affecting the expression of β1-integrin itself. However, whether this regulatory mechanism is conserved among different cell types remains to be determined. Herein, we attempted to determine the effects of CRT on β1-integrin in human prostate cancer PC-3 cells. CRT expression was suppressed in PC-3 cells through siRNA treatment, and then the expression levels of FUT-1 and β1-integrin were monitored through RT-PCR. We found that knockdown of CRT expression in PC-3 cells significantly affected the expression of β1-integrin itself. In addition, the lower expression level of β1-integrin was due to affecting the mRNA stability. In contrast, FUT-1 expression level was not affected by knockdown of CRT. These results strongly suggested that CRT regulates cellular behavior differently in different cell types. We further confirmed that CRT directly binds to the 3′UTR of β1-integrin mRNA by EMSA and therefore affects its stability. The suppression of CRT expression also affects PC-3 cell adhesion to type I collagen substrate. In addition, the levels of total and activated β1-integrin expressed on cell surface were both significantly suppressed by CRT knockdown. Furthermore, the intracellular distribution of β1-integrin was also affected by lowering the expression of CRT. This change in distribution is not lysosomal nor proteosomal pathway-dependent. The treatment of fucosydase significantly affected the activation of surface β1-integrin, which is conserved among different cell types. These results suggested that CRT affects the expression of β1-integrin through distinct regulatory mechanisms. |
| first_indexed | 2024-03-09T20:05:40Z |
| format | Article |
| id | doaj.art-3be0dcbf52bc486cb0bba293b60fbc4a |
| institution | Directory Open Access Journal |
| issn | 2227-9059 |
| language | English |
| last_indexed | 2024-03-09T20:05:40Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Biomedicines |
| spelling | doaj.art-3be0dcbf52bc486cb0bba293b60fbc4a2023-11-24T00:33:16ZengMDPI AGBiomedicines2227-90592022-03-0110364610.3390/biomedicines10030646Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer CellsYueh-Chien Lin0Yuan-Li Huang1Ming-Hua Wang2Chih-Yu Chen3Wei-Min Chen4Yi-Cheng Weng5Pei-Yi Wu6Vascular Biology Program, Department of Surgery, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USADepartment of Medical Laboratory Science and Biotechnology, Asia University, Taichung 41354, TaiwanDepartment of Radiation Oncology, Lianxin International Hospital, Taoyuan 32001, TaiwanDepartment of Life Science, National Taiwan University, Taipei 10617, TaiwanDepartment of Life Science, National Taiwan University, Taipei 10617, TaiwanDepartment of Life Science, National Taiwan University, Taipei 10617, TaiwanDepartment of Life Sciences, National Central University, Taoyuan 32001, TaiwanProstate cancer (PCa) is the major cause of cancer-related death among aging men worldwide. Recent studies have suggested that calreticulin (CRT), a multifunctional chaperon protein, may play an important role in the regulation of PCa tumorigenesis and progression. However, the underlying mechanisms are still unclear. Integrin is an important regulator of cancer metastasis. Our previous study demonstrated that in J82 bladder cancer cells, CRT affects integrin activity through FUBP-1-FUT-1-dependent fucosylation, rather than directly affecting the expression of β1-integrin itself. However, whether this regulatory mechanism is conserved among different cell types remains to be determined. Herein, we attempted to determine the effects of CRT on β1-integrin in human prostate cancer PC-3 cells. CRT expression was suppressed in PC-3 cells through siRNA treatment, and then the expression levels of FUT-1 and β1-integrin were monitored through RT-PCR. We found that knockdown of CRT expression in PC-3 cells significantly affected the expression of β1-integrin itself. In addition, the lower expression level of β1-integrin was due to affecting the mRNA stability. In contrast, FUT-1 expression level was not affected by knockdown of CRT. These results strongly suggested that CRT regulates cellular behavior differently in different cell types. We further confirmed that CRT directly binds to the 3′UTR of β1-integrin mRNA by EMSA and therefore affects its stability. The suppression of CRT expression also affects PC-3 cell adhesion to type I collagen substrate. In addition, the levels of total and activated β1-integrin expressed on cell surface were both significantly suppressed by CRT knockdown. Furthermore, the intracellular distribution of β1-integrin was also affected by lowering the expression of CRT. This change in distribution is not lysosomal nor proteosomal pathway-dependent. The treatment of fucosydase significantly affected the activation of surface β1-integrin, which is conserved among different cell types. These results suggested that CRT affects the expression of β1-integrin through distinct regulatory mechanisms.https://www.mdpi.com/2227-9059/10/3/646calreticulinintegrinmRNA stabilityAU-rich element |
| spellingShingle | Yueh-Chien Lin Yuan-Li Huang Ming-Hua Wang Chih-Yu Chen Wei-Min Chen Yi-Cheng Weng Pei-Yi Wu Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells Biomedicines calreticulin integrin mRNA stability AU-rich element |
| title | Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells |
| title_full | Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells |
| title_fullStr | Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells |
| title_full_unstemmed | Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells |
| title_short | Calreticulin Regulates β1-Integrin mRNA Stability in PC-3 Prostate Cancer Cells |
| title_sort | calreticulin regulates β1 integrin mrna stability in pc 3 prostate cancer cells |
| topic | calreticulin integrin mRNA stability AU-rich element |
| url | https://www.mdpi.com/2227-9059/10/3/646 |
| work_keys_str_mv | AT yuehchienlin calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT yuanlihuang calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT minghuawang calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT chihyuchen calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT weiminchen calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT yichengweng calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells AT peiyiwu calreticulinregulatesb1integrinmrnastabilityinpc3prostatecancercells |