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Xiang X, Palasuberniam P, Pare R. The Role of Estrogen across Multiple Disease Mechanisms. Curr Issues Mol Biol 2024; 46:8170-8196. [PMID: 39194700 DOI: 10.3390/cimb46080483] [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: 06/13/2024] [Revised: 07/18/2024] [Accepted: 07/24/2024] [Indexed: 08/29/2024] Open
Abstract
Estrogen is a significant hormone that is involved in a multitude of physiological and pathological processes. In addition to its pivotal role in the reproductive system, estrogen is also implicated in the pathogenesis of a multitude of diseases. Nevertheless, previous research on the role of estrogen in a multitude of diseases, including Alzheimer's disease, depression, cardiovascular disease, diabetes, osteoporosis, gastrointestinal diseases, and estrogen-dependent cancers, has concentrated on a single disease area, resulting in a lack of comprehensive understanding of cross-disease mechanisms. This has brought some challenges to the current treatment methods for these diseases, because estrogen as a potential therapeutic tool has not yet fully developed its potential. Therefore, this review aims to comprehensively explore the mechanism of estrogen in these seven types of diseases. The objective of this study is to describe the relationship between each disease and estrogen, including the ways in which estrogen participates in regulating disease mechanisms, and to outline the efficacy of estrogen in treating these diseases in clinical practice. By studying the role of estrogen in a variety of disease mechanisms, it is hoped that a more accurate theoretical basis and clinical guidance for future treatment strategies will be provided, thus promoting the effective management and treatment of these diseases.
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Affiliation(s)
- Xiuting Xiang
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
| | - Praneetha Palasuberniam
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
| | - Rahmawati Pare
- Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Malaysia Sabah, Kota Kinabalu 88400, Malaysia
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Ge Y, Ni X, Li J, Ye M, Jin X. Roles of estrogen receptor α in endometrial carcinoma (Review). Oncol Lett 2023; 26:530. [PMID: 38020303 PMCID: PMC10644365 DOI: 10.3892/ol.2023.14117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 10/06/2023] [Indexed: 12/01/2023] Open
Abstract
Endometrial carcinoma (EC) is a group of endometrial epithelial malignancies, most of which are adenocarcinomas and occur in perimenopausal and postmenopausal women. It is one of the most common carcinomas of the female reproductive system. It has been shown that the occurrence and development of EC is closely associated with the interaction between estrogen (estradiol, E2) and estrogen receptors (ERs), particularly ERα. As a key nuclear transcription factor, ERα is a carcinogenic factor in EC. Its interactions with upstream and downstream effectors and co-regulators have important implications for the proliferation, metastasis, invasion and inhibition of apoptosis of EC. In the present review, the structure of ERα and the regulation of ERα in multiple dimensions are described. In addition, the classical E2/ERα signaling pathway and the crosstalk between ERα and other EC regulators are elucidated, as well as the therapeutic targeting of ERα, which may provide a new direction for clinical applications of ERα in the future.
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Affiliation(s)
- Yidong Ge
- Department of Medical Oncology, The First Hospital of Ningbo University, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
- Zhejiang Key Laboratory of Pathophysiology, Department of Biochemistry and Molecular Biology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Xiaoqi Ni
- Department of Medical Oncology, The First Hospital of Ningbo University, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
- Zhejiang Key Laboratory of Pathophysiology, Department of Biochemistry and Molecular Biology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Jingyun Li
- Department of Medical Oncology, The First Hospital of Ningbo University, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
- Zhejiang Key Laboratory of Pathophysiology, Department of Biochemistry and Molecular Biology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Meng Ye
- Department of Medical Oncology, The First Hospital of Ningbo University, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
- Zhejiang Key Laboratory of Pathophysiology, Department of Biochemistry and Molecular Biology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
| | - Xiaofeng Jin
- Department of Medical Oncology, The First Hospital of Ningbo University, Ningbo University, Ningbo, Zhejiang 315020, P.R. China
- Zhejiang Key Laboratory of Pathophysiology, Department of Biochemistry and Molecular Biology, Health Science Center, Ningbo University, Ningbo, Zhejiang 315211, P.R. China
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Exploration of the Danggui Buxue Decoction Mechanism Regulating the Balance of ESR and AR in the TP53-AKT Signaling Pathway in the Prevention and Treatment of POF. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2022; 2021:4862164. [PMID: 35003302 PMCID: PMC8739177 DOI: 10.1155/2021/4862164] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 11/16/2021] [Indexed: 12/20/2022]
Abstract
Objective The purpose of this study was to explore the molecular mechanism of Danggui Buxue Decoction (DBD) intervening premature ovarian failure (POF). Methods The active compounds-targets network, active compounds-POF-targets network, and protein-protein interaction (PPI) network were constructed by a network pharmacology approach: Gene Ontology (GO) function and Kyoto Encyclopedia of Gene and Genome (KEGG) pathway analysis by DAVID 6.8 database. The molecular docking method was used to verify the interaction between core components of DBD and targets. Then, High-Performance Liquid Chromatography (HPLC) analysis was used to determine whether the DBD contained two key components including quercetin and kaempferol. Finally, the estrous cycle, organ index, ELISA, and western blot were used to verify that mechanism of DBD improved POF induced by cyclophosphamide (CTX) in rats. Results Based on the network database including TCMSP, Swiss Target Prediction, DisGeNET, DrugBank, OMIM, and Malacard, we built the active compounds-targets network and active compounds-POF-targets network. We found that 2 core compounds (quercetin and kaempferol) and 5 critical targets (TP53, IL6, ESR1, AKT1, and AR) play an important role in the treatment of POF with DBD. The GO and KEGG enrichment analysis showed that the common targets involved a variety of signaling pathways, including the reactive oxygen species metabolic process, release of Cytochrome C from mitochondria and apoptotic signaling pathway, p53 signaling pathway, the PI3K-Akt signaling pathway, and the estrogen signaling pathway. The molecular docking showed that quercetin, kaempferol, and 5 critical targets had good results regarding the binding energy. Chromatography showed that DBD contained quercetin and kaempferol compounds, which was consistent with the database prediction results. Based on the above results, we found that the process of DBD interfering POF is closely related to the balance of ESR and AR in TP53-AKT signaling pathway and verified animal experiments. In animal experiments, we have shown that DBD and its active compounds can effectively improve estrus cycle of POF rats, inhibit serum levels of FSH and LH, protein expression levels of Cytochrome C, BAX, p53, and IL6, and promote ovary index, uterine index, serum levels of E2 and AMH, and protein expression levels of AKT1, ESR1, AR, and BCL2. Conclusions DBD and its active components could treat POF by regulating the balance of ESR and AR in TP53-AKT signaling pathway.
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Ouyang DQ, Liang LZ, Ke ZF, Zheng GS, Weng DS, Yang WF, Su YX, Liao GQ. Association between high expression of phosphorylated Akt and mammalian target of rapamycin and improved survival in salivary gland adenoid cystic carcinoma. Head Neck 2017; 39:1145-1154. [DOI: 10.1002/hed.24732] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 12/04/2016] [Accepted: 12/29/2016] [Indexed: 01/31/2023] Open
Affiliation(s)
- Dai-qiao Ouyang
- Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology; Sun Yat-sen University; Guangzhou Guangdong China
| | - Li-zhong Liang
- Department of Oral and Maxillofacial Surgery; Fifth Affiliated Hospital of Sun Yat-sen University; Zhuhai Guangdong China
| | - Zun-fu Ke
- Department of Pathology, The First Affiliated Hospital; Sun Yat-sen University; Guangzhou Guangdong China
| | - Guang-sen Zheng
- Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology; Sun Yat-sen University; Guangzhou Guangdong China
| | - De-sheng Weng
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangzhou Guangdong China
| | - Wei-fa Yang
- Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology; Sun Yat-sen University; Guangzhou Guangdong China
- Division of Oral and Maxillofacial Surgery, Faculty of Dentistry; The University of Hong Kong; Hong Kong China
| | - Yu-xiong Su
- Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology; Sun Yat-sen University; Guangzhou Guangdong China
- Division of Oral and Maxillofacial Surgery, Faculty of Dentistry; The University of Hong Kong; Hong Kong China
| | - Gui-qing Liao
- Department of Oral and Maxillofacial Surgery, Guanghua School of Stomatology, Guangdong Provincial Key Laboratory of Stomatology; Sun Yat-sen University; Guangzhou Guangdong China
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O’Rourke RW. Endometrial hyperplasia, endometrial cancer, and obesity: convergent mechanisms regulating energy homeostasis and cellular proliferation. Surg Obes Relat Dis 2014; 10:926-8. [DOI: 10.1016/j.soard.2014.03.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 03/27/2014] [Indexed: 12/19/2022]
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Gungorduk K, Ertas IE, Sahbaz A, Ozvural S, Sarica Y, Ozdemir A, Sayhan S, Gokcu M, Yilmaz B, Sanci M, Inan S, Harma M, Yildirim Y. Immunolocalization of ERK1/2 and p-AKT in normal endometrium, endometrial hyperplasia, and early and advanced stage endometrioid endometrial adenocancer and their prognostic significance in malignant group. Eur J Obstet Gynecol Reprod Biol 2014; 179:147-52. [PMID: 24965996 DOI: 10.1016/j.ejogrb.2014.05.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Revised: 05/11/2014] [Accepted: 05/28/2014] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To analyze the expression patterns of extracellular signal-regulated kinase (ERK1/2) and phosphorylated (p)-AKT in the tissues of non-pathologic endometrium, endometrial hyperplasia, and early and advanced stage endometrioid endometrial adenocancer using indirect immunohistochemistry, and also to investigate the effect of ERK1/2 and p-AKT expression patterns on prognosis in endometrioid adenocancer. STUDY DESIGN Immunolocalization of ERK1/2 and p-AKT was examined in six different types of endometrial tissues: proliferative endometrium (PE; n=10, 11.2%), secretuar endometrium (SE; n=10, 11.2%), simple hyperplasia (SH; n=15, 16.9%), complex hyperplasia (CH; n=3, 3.4%) and atypical complex hyperplasia (ACH; n=10, 11.2%), which were obtained from endometrial biopsies, curettage materials, and hysterectomy specimens and classified as the benign group; and both early stage endometrioid (n=21, 23.6%) and advanced stage endometrioid adenocancer (AC; n=20, 22.5%), which were obtained from complete surgical staging materials and classified as the malignant group. All specimens were fixed in 10% formalin and processed using routine paraffin protocols. Immunostaining intensities were evaluated as negative or weak (assigned as low expression) and moderate or strong (assigned as high expression). RESULTS In the malignant group, 23 of 41 patients (56.1%) had high ERK1/2 and p-AKT expression, whereas only three of 48 patients in the benign group (6.3%) had high ERK1/2 and p-AKT expression (P<0.0001 and P<0.0001, respectively). p-AKT expression was significantly higher in women with positive lymph nodes (OR 9.0; 95% CI: 1.2-100.0; P=0.03). Higher expression of p-AKT was significantly associated with poor progression-free survival (PFS) and overall survival (OS). In contrast, ERK1/2 expression was not associated with PFS or OS.Conclusions ERK1/2 and p-AKT can be useful in the differential diagnosis of benign vs. malignant endometrial lesions, as well as early vs. advanced stage endometrioid endometrial adenocancer. Additionally, higher p-AKT expression could be used as a marker of poor prognosis in the management of patients with endometrioid endometrial adenocancer.
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Affiliation(s)
- Kemal Gungorduk
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Ibrahim Egemen Ertas
- Department of Obstetrics and Gynecology, Tepecik Education and Research Hospital, Izmir, Turkey.
| | - Ahmet Sahbaz
- Department of Obstetrics and Gynecology, Bulent Ecevit University, School of Medicine, Zonguldak, Turkey
| | - Seyfettin Ozvural
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Yagmur Sarica
- Department of Histology and Embryology, Celal Bayar University, School of Medicine, Manisa, Turkey
| | - Aykut Ozdemir
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Sevil Sayhan
- Department of Pathology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Mehmet Gokcu
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Bulent Yilmaz
- Department of Obstetrics and Gynecology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Muzaffer Sanci
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
| | - Sevinc Inan
- Department of Histology and Embryology, Celal Bayar University, School of Medicine, Manisa, Turkey
| | - Mehmet Harma
- Department of Obstetrics and Gynecology, Bulent Ecevit University, School of Medicine, Zonguldak, Turkey
| | - Yusuf Yildirim
- Department of Gynecologic Oncology, Tepecik Education and Research Hospital, Izmir, Turkey
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Zhao S, Fu J, Liu F, Rastogi R, Zhang J, Zhao Y. Small interfering RNA directed against CTMP reduces acute traumatic brain injury in a mouse model by activating Akt. Neurol Res 2014; 36:483-90. [PMID: 24670215 DOI: 10.1179/1743132814y.0000000353] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVE Protein kinase B (PKB/Akt), which is phosphorylated and activated by upstream activators, exerts critical neuroprotective effects by phosphorylating downstream targets after traumatic brain injury (TBI). Studies on the regulation of Akt will be crucial for our understanding of neuronal survival. The goal of this study is to investigate the effects of carboxyl-terminal modulator protein (CTMP) on phosphorylation of Akt and neurological function in a mouse model of TBI. METHODS Traumatic brain injury in mice was performed by a controlled cortical impact device. The expression of Akt, phospho-Akt, and CTMP was examined in the injured cortices by immunohistochemistry and Western blot analysis. To determine the effects of CTMP, small interfering RNAs (siRNAs) directed against CTMP were injected in mice with TBI, and the expression of phosphorylated Akt and neurological function were evaluated. RESULTS Phospho-Akt significantly increased at 4 hours post-TBI in the nucleus (P < 0.01) and remained at high levels until 72 hours after TBI, as shown by Western blot analysis. In the cytosol, the expression of phospho-Akt reached its peak at 4 hours post-TBI, but decreased markedly at 24 hours and maintained below pre-TBI levels until 72 hours post-TBI. Interestingly, the expression of CTMP significantly increased 4 hours after TBI (P < 0.01) and sustained those levels until 72 hours without dramatic changes. Treatment with CTMP siRNA effectively augmented the phosphorylation of Akt and significantly improved the neurological functional recovery up to 28 days post-TBI. CONCLUSION We conclude that Akt is phosphorylated and translocated to nucleus after TBI to exert neuroprotective effects. However, CTMP is simultaneously triggered to inhibit the phosphorylation of Akt. Inhibition of CTMP by siRNA improves the recovery of neurological functions after TBI.
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Libby EF, Azrad M, Novak L, Vazquez AI, Wilson TR, Demark-Wahnefried W. Obesity is associated with higher 4E-BP1 expression in endometrial cancer. ACTA ACUST UNITED AC 2014; 2014:1-7. [PMID: 24639918 PMCID: PMC3955094 DOI: 10.2147/cbf.s53530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
PURPOSE Obesity is associated with risk and prognosis of endometrial cancer (EC), and the mammalian target of rapamycin complex 1 (mTORC1) pathway may play an instrumental role. We sought to explore the associations between cellular proliferation, Akt, and 4E binding protein-1 (4E-BP1) (a downstream target of mTORC1), in obese and nonobese women with and without EC. METHODS Archival tissue-specimens from endometrial biopsies were grouped into two broad categories based on the observed disease behavior and similarities in tissue staining patterns: benign/hyperplasia (without cytologic atypia) (n=18) versus atypia (complex hyperplasia with cytologic atypia)/carcinoma (n=25). The characteristics of the study population, including height and weight to determine body mass index (BMI: kg/m2), were abstracted from medical records. Immunohistochemistry was used to assess the phosphorylated (p)Akt, p4E-BP1, and antigen Ki67. RESULTS Cytoplasmic and nuclear pAkt were significantly associated with cytoplasmic p4E-BP1 (ρ=+0.48, ρ=+0.50) (P<0.05) and nuclear p4E-BP1 (ρ=+0.40, ρ=+0.44) (P<0.05); cytoplasmic and nuclear p4E-BP1 were significantly associated with Ki67 (ρ=+0.46, ρ=+0.59) (P<0.05). Compared with the benign/hyperplasia group, the women with atypia/carcinoma had significantly higher cytoplasmic and nuclear p4E-BP1 and Ki67. This staining pattern was similar in obese women; however, in nonobese women, neither cytoplasmic nor nuclear p4E-BP1staining differed between benign/hyperplasia versus atypia/carcinoma. CONCLUSION The activation of 4E-BP1 was higher in the obese women with EC. Adiposity may be a key factor to consider in future studies investigating the role of 4E-BP1 as a biomarker and therapeutic target in EC.
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Affiliation(s)
- Emily Falk Libby
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Maria Azrad
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Lea Novak
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Ana I Vazquez
- Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Tamara R Wilson
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
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Zhou W, Slingerland JM. Links between oestrogen receptor activation and proteolysis: relevance to hormone-regulated cancer therapy. Nat Rev Cancer 2014; 14:26-38. [PMID: 24505618 DOI: 10.1038/nrc3622] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oestrogen receptor-α (ERα) is a master transcription factor that regulates cell proliferation and homeostasis in many tissues. Despite beneficial ERα functions, sustained oestrogenic exposure increases the risk and/or the progression of various cancers, including those of the breast, endometrium and ovary. Oestrogen–ERα interaction can trigger post-translational ERα modifications through crosstalk with signalling pathways to promote transcriptional activation and ubiquitin-mediated ERα proteolysis, with co-activators that have dual roles as ubiquitin ligases. These processes are reviewed herein. The elucidation of mechanisms whereby oestrogen drives both ERα transactivation and receptor proteolysis might have important therapeutic implications not only for breast cancer but also potentially for other hormone-regulated cancers.
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He X, Saji M, Radhakrishnan D, Romigh T, Ngeow J, Yu Q, Wang Y, Ringel MD, Eng C. PTEN lipid phosphatase activity and proper subcellular localization are necessary and sufficient for down-regulating AKT phosphorylation in the nucleus in Cowden syndrome. J Clin Endocrinol Metab 2012; 97:E2179-87. [PMID: 22962422 PMCID: PMC3485596 DOI: 10.1210/jc.2012-1991] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Germline mutations in PTEN are associated with phosphatase and tensin homolog deleted on chromosome 10 (PTEN) hamartoma tumor syndrome including Cowden syndrome (CS) and Cowden-like syndrome (CSL) that predisposes to high risks of benign and malignant tumors of thyroid and breast. OBJECTIVE The objective of the study was to analyze the subcellular pattern of phosphorylated (P)-AKT expression in nonmedullary thyroid cancers from PTEN hamartoma tumor syndrome patients and to investigate whether the lack of PTEN in the nucleus and/or lack of proper PTEN function in the nucleus affect(s) nuclear AKT activity in CS patients. DESIGN In all, 664 patients with CS/CSL were screened for PTEN germline mutations and nonmedullary thyroid cancers. Twenty-two patients who have both pathogenic PTEN germline mutations and nonmedullary thyroid cancers were selected. Thyroid samples from these patients were stained for PTEN and P-AKT. In our in vitro study, PTEN was knocked down or overexpressed in both thyroid cancer cells and breast cancer cells, and nuclear P-AKT was compared with the control. RESULTS Loss of PTEN protein was found in thyroid adenomas and carcinomas from all 22 (100%) PTEN(Mut+) CS/CSL patients. AKT activation was identified in 17 of 22 (77.3%) thyroid adenoma/carcinoma specimens, and most patients (63.7%) have activated nuclear AKT. Knockdown of PTEN in cells containing wild-type PTEN enhanced nuclear P-AKT, whereas expression of wild-type PTEN, but not phosphatase-dead mutants (C124S or G129E), markedly reduced nuclear P-AKT in PTEN null cells. We also showed that in breast cancer but not thyroid cancer cells, PTEN suppresses nuclear P-AKT mainly through decreasing P-AKT nuclear translocation by reducing the PIP3/P-AKT reservoir in the cytoplasm. In thyroid cancer cells, PTEN suppresses phosphorylation of AKT already resident in the nucleus. CONCLUSIONS PTEN is necessary and sufficient for inhibiting AKT activation in the nucleus through its intact lipid phosphatase activity and proper subcellular localization.
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Affiliation(s)
- Xin He
- Cleveland Clinic, 9500 Euclid Avenue, NE50, Cleveland, Ohio 44195, USA
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Ettl T, Schwarz-Furlan S, Haubner F, Müller S, Zenk J, Gosau M, Reichert TE, Zeitler K. The PI3K/AKT/mTOR signalling pathway is active in salivary gland cancer and implies different functions and prognoses depending on cell localisation. Oral Oncol 2012; 48:822-30. [PMID: 22445095 DOI: 10.1016/j.oraloncology.2012.02.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 02/21/2012] [Accepted: 02/25/2012] [Indexed: 11/27/2022]
Abstract
OBJECTIVES The PI3K/AKT/mTOR signalling axis controls cell proliferation and survival and has achieved major importance as a target for cancer therapy. This investigation evaluated the expression of the major components P-AKT, P-mTOR, PI3K and P-S6rp in salivary gland cancer. MATERIALS AND METHODS Immunohistochemical expression of P-AKT, P-mTOR, PI3K and P-S6rp was evaluated and correlated to clinicopathological parameters and survival of 272 patients with salivary gland carcinomas. RESULTS AND CONCLUSION Analysis of all tumours together revealed an increased expression of all components of the pathway in comparison to normal salivary gland control tissue. Nuclear expression of P-AKT was associated with young age, localised tumour stage, absence of lymph node metastases and favourable prognosis. On the contrary, cytoplasmic P-AKT displayed unfavourable tumour characteristics like high-grade malignancy, and worse overall survival. In comparison to cytoplasmic/membrane mTOR expression, nuclear P-mTOR was associated with absence of lymph node metastases and higher survival rates. PI3K and P-S6rp were exclusively found in the cytoplasm. Expression of P-S6rp was correlated to increased age, advanced tumour size and lymph node metastases. In all tumours together, nuclear P-AKT positively correlated with nuclear P-mTOR, whereas P-S6rp was associated with expression of PI3K and cytoplasmic P-AKT. In acinic cell carcinoma, cytoplasmic expression of P-AKT, P-mTOR, PI3K and P-S6rp was positively associated with each other. In conclusion, PI3K/AKT/mTOR signalling is active in salivary gland cancer and might function as a target for personalised therapy. P-AKT and P-mTOR possess distinct molecular functions with impact on prognosis depending on their cellular localisation.
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Affiliation(s)
- Tobias Ettl
- Department of Oral and Maxillofacial Surgery, University of Regensburg, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany.
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