1
|
Harrington JS, Ryter SW, Plataki M, Price DR, Choi AMK. Mitochondria in health, disease, and aging. Physiol Rev 2023; 103:2349-2422. [PMID: 37021870 PMCID: PMC10393386 DOI: 10.1152/physrev.00058.2021] [Citation(s) in RCA: 250] [Impact Index Per Article: 125.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/28/2023] [Accepted: 03/30/2023] [Indexed: 04/07/2023] Open
Abstract
Mitochondria are well known as organelles responsible for the maintenance of cellular bioenergetics through the production of ATP. Although oxidative phosphorylation may be their most important function, mitochondria are also integral for the synthesis of metabolic precursors, calcium regulation, the production of reactive oxygen species, immune signaling, and apoptosis. Considering the breadth of their responsibilities, mitochondria are fundamental for cellular metabolism and homeostasis. Appreciating this significance, translational medicine has begun to investigate how mitochondrial dysfunction can represent a harbinger of disease. In this review, we provide a detailed overview of mitochondrial metabolism, cellular bioenergetics, mitochondrial dynamics, autophagy, mitochondrial damage-associated molecular patterns, mitochondria-mediated cell death pathways, and how mitochondrial dysfunction at any of these levels is associated with disease pathogenesis. Mitochondria-dependent pathways may thereby represent an attractive therapeutic target for ameliorating human disease.
Collapse
Affiliation(s)
- John S Harrington
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, New York-Presbyterian Hospital/Weill Cornell Medical Center, Weill Cornell Medicine, New York, New York, United States
| | | | - Maria Plataki
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, New York-Presbyterian Hospital/Weill Cornell Medical Center, Weill Cornell Medicine, New York, New York, United States
| | - David R Price
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, New York-Presbyterian Hospital/Weill Cornell Medical Center, Weill Cornell Medicine, New York, New York, United States
| | - Augustine M K Choi
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, New York-Presbyterian Hospital/Weill Cornell Medical Center, Weill Cornell Medicine, New York, New York, United States
| |
Collapse
|
2
|
A Combination of Natural Products, BenPros (Green Tea Extract, Soybean Extract and Camellia Japonica Oil), Ameliorates Benign Prostatic Hyperplasia. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12126121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Benign prostatic hyperplasia (BPH) is one of the most common diseases in elderly men and causes lower urinary tract symptoms due to excessive proliferation of prostate stromal and epithelial cells. The present study investigated the improving effect of BenPros, an edible natural product mixture (green tea extract, soybean extract and camellia japonica oil), against the development of BPH in vitro and in vivo. BenPros treatment showed inhibitory ability on testosterone-induced androgen receptor, prostate-specific antigen (PSA), and 5α-reductase protein expression in LNCap-LN3 cells and anti-inflammatory effects on LPS-induced increases in interleukin-6 and tumor necrosis factor-α in RAW264.7 cells. In a testosterone propionate (TP)-induced BPH rat model, BenPros decreased the up-regulated serum 5α-dihydrotestosterone and PSA levels. Moreover, BenPros also significantly reduced PSA protein expression in prostate tissue. Furthermore, TP-induced increased expression of cyclooxygenase 2 and B-cell lymphoma 2 (Bcl-2) were reduced by BenPros, resulting in an increase in the Bcl-2/BCL2-related X ratio. These regulatory abilities of BenPros on BPH inducing markers also reduced prostate size and epithelial thickness based on histological analysis. These results indicate that BenPros has a protective ability against BPH in vitro and in vivo, and it may be a promising candidate as a functional food in regulating BPH.
Collapse
|
3
|
Apple Polyphenols Extract (APE) Alleviated Dextran Sulfate Sodium Induced Acute Ulcerative Colitis and Accompanying Neuroinflammation via Inhibition of Apoptosis and Pyroptosis. Foods 2021; 10:foods10112711. [PMID: 34828992 PMCID: PMC8619666 DOI: 10.3390/foods10112711] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 11/01/2021] [Accepted: 11/02/2021] [Indexed: 12/15/2022] Open
Abstract
The main aim of this study was to investigate the potent anti-apoptosis and anti-pyroptosis effects of apple polyphenols extract (APE) on dextran sulfate sodium model group (DSS)-induced acute ulcerative colitis (UC) and the protective effect of APE against acute UC-related neuroinflammation and synapse damage. Forty-three C57BL/6 male mice were randomly divided into a control group (CON), a 3% DSS model group (DSS), a 500 mg/(kg·bw·d) APE group (HAP), and a 125 (LD) or 500 (HD) mg/(kg·bw·d) APE treatment concomitantly with DSS treatment group. The results showed that APE significantly ameliorated DSS-induced acute UC through inhibiting intestinal epithelial cell (IEC) apoptosis and the Caspase-1/Caspase-11-dependent pyroptosis pathway, with increased BCL-2 protein expression and decreased protein levels of NLRP3, ASC, Caspase-1/11, and GSDND. Furthermore, APE significantly reduced acute UC-related neuroinflammation and synapse damage, supported by decreased mRNA levels of hypothalamus Cox-2 and hippocampus Gfap and also increased the mRNA levels of hypothalamus Psd-95. The increased protein expression of ZO-1 and Occludin improved the intestinal barrier integrity and improved the function of goblet cells by upregulating the protein level of MUC-2 and TTF3 accounted for the beneficial effects of APE on UC-associated neuroinflammation. Therefore, APE might be a safe and effective agent for the management of acute UC.
Collapse
|
4
|
Chang M, Zhu D, Chen Y, Zhang W, Liu X, Li XL, Cheng Z, Su Z, Zhang J, Lu Y, Guo H. Total Flavonoids of Litchi Seed Attenuate Prostate Cancer Progression Via Inhibiting AKT/mTOR and NF-kB Signaling Pathways. Front Pharmacol 2021; 12:758219. [PMID: 34630125 PMCID: PMC8495171 DOI: 10.3389/fphar.2021.758219] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 09/13/2021] [Indexed: 01/01/2023] Open
Abstract
Litchi seeds have been traditionally used in Chinese herbal formula for urologic neoplasms including prostate cancer (PCa). However, the effective components of Litchi seeds and the mechanisms of their actions on PCa cell growth and metastasis remain unclear. In this study, we investigated the effects and molecular mechanisms of the Total Flavonoid of Litchi Seed (TFLS) in PCa PC3 and DU145 cell lines. We found that TFLS significantly inhibited the PCa cell proliferation, induced apoptosis, and prevented cell migration and invasion. Furthermore, we observed that TFLS upregulated the expression of epithelial biomarker E-cadherin and downregulated mesenchymal biomarker Vimentin. TFLS also increased the expression of cleaved-PRAP and Bax, and decreased the expression of Bcl-2 in both PC3 and DU145 cells. Besides, TFLS inhibited AKT signaling pathway by reducing the phosphorylation of AKT and activities of downstream signal transducers including mTOR, IκBα and NF-kB. Finally, TFLS treated mice exhibited a significant decrease in tumor size without toxicity in major organs in vivo. These results indicated that TFLS could suppress PCa cell growth in vivo and inhibit PCa cell proliferation and metastasis in vitro through induction of apoptosis and phenotypic reversal of EMT, which may be achieved by inhibiting the AKT/mTOR and NF-κB signaling pathways. Taken together, our data provide new insights into the role of TFLS as a novel potent anti-cancer agent for the treatment of PCa.
Collapse
Affiliation(s)
- Ming Chang
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,School of Medicine, Southern University of Science and Technology, Shenzhen, China.,Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen, China
| | - Dan Zhu
- Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Yanjiang Chen
- Department of Surgery, University of Melbourne, Parkville, VIC, Australia
| | - Weiquan Zhang
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Xi Liu
- Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Xiao-Lan Li
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Zhiping Cheng
- Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Zhiheng Su
- Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| | - Jian Zhang
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,School of Medicine, Southern University of Science and Technology, Shenzhen, China.,Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen, China
| | - Yi Lu
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,School of Medicine, Southern University of Science and Technology, Shenzhen, China.,Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen, China
| | - Hongwei Guo
- Key Laboratory of Longevity and Aging-Related Diseases of Chinese Ministry of Education, Center for Translational Medicine, Guangxi Medical University, Nanning, China.,Guangxi Key Laboratory of Bioactive Molecules Research and Evaluation, College of Pharmacy, Guangxi Medical University, Nanning, China
| |
Collapse
|
5
|
Hu XM, Li ZX, Zhang DY, Yang YC, Fu SA, Zhang ZQ, Yang RH, Xiong K. A systematic summary of survival and death signalling during the life of hair follicle stem cells. Stem Cell Res Ther 2021; 12:453. [PMID: 34380571 PMCID: PMC8359037 DOI: 10.1186/s13287-021-02527-y] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 07/26/2021] [Indexed: 12/13/2022] Open
Abstract
Hair follicle stem cells (HFSCs) are among the most widely available resources and most frequently approved model systems used for studying adult stem cells. HFSCs are particularly useful because of their self-renewal and differentiation properties. Additionally, the cyclic growth of hair follicles is driven by HFSCs. There are high expectations for the use of HFSCs as favourable systems for studying the molecular mechanisms that contribute to HFSC identification and can be applied to hair loss therapy, such as the activation or regeneration of hair follicles, and to the generation of hair using a tissue-engineering strategy. A variety of molecules are involved in the networks that critically regulate the fate of HFSCs, such as factors in hair follicle growth and development (in the Wnt pathway, Sonic hedgehog pathway, Notch pathway, and BMP pathway), and that suppress apoptotic cues (the apoptosis pathway). Here, we review the life cycle, biomarkers and functions of HFSCs, concluding with a summary of the signalling pathways involved in HFSC fate for promoting better understanding of the pathophysiological changes in the HFSC niche. Importantly, we highlight the potential mechanisms underlying the therapeutic targets involved in pathways associated with the treatment of hair loss and other disorders of skin and hair, including alopecia, skin cancer, skin inflammation, and skin wound healing.
Collapse
Affiliation(s)
- Xi-Min Hu
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
- Department of Dermatology, Xiangya Hospital, Central South University, Changsha, 410013, China
| | - Zhi-Xin Li
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
| | - Dan-Yi Zhang
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
| | - Yi-Chao Yang
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
| | - Shen-Ao Fu
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
| | - Zai-Qiu Zhang
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China
| | - Rong-Hua Yang
- Department of Burn Surgery, The First People's Hospital of Foshan, #81, Lingnan North Road, Foshan, 528000, China.
| | - Kun Xiong
- Department of Anatomy and Neurobiology, School of Basic Medical Sciences, Central South University, Morphological Sciences Building, 172 Tongzi Po Road, Changsha, 410013, China.
- Hunan Key Laboratory of Ophthalmology, Changsha, 410008, China.
| |
Collapse
|
6
|
Yan J, Zhang Y, Sheng G, Ni B, Xiao Y, Wang S, Wang T, Ma Y, Wang H, Wu H, Tu C. Selonsertib Alleviates the Progression of Rat Osteoarthritis: An in vitro and in vivo Study. Front Pharmacol 2021; 12:687033. [PMID: 34322020 PMCID: PMC8311523 DOI: 10.3389/fphar.2021.687033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 06/30/2021] [Indexed: 01/26/2023] Open
Abstract
Osteoarthritis (OA) is a prevalent degenerative joint disease. Its development is highly associated with inflammatory response and apoptosis in chondrocytes. Selonsertib (Ser), the inhibitor of Apoptosis Signal-regulated kinase-1 (ASK1), has exhibited multiple therapeutic effects in several diseases. However, the exact role of Ser in OA remains unclear. Herein, we investigated the anti-arthritic effects as well as the potential mechanism of Ser on rat OA. Our results showed that Ser could markedly prevent the IL-1β-induced inflammatory reaction, cartilage degradation and cell apoptosis in rat chondrocytes. Meanwhile, the ASK1/P38/JNK and NFκB pathways were involved in the protective roles of Ser. Furthermore, intra-articular injection of Ser could significantly alleviate the surgery induced cartilage damage in rat OA model. In conclusion, our work provided insights into the therapeutic potential of Ser in OA, indicating that Ser might serve as a new avenue in OA treatment.
Collapse
Affiliation(s)
- Jiyuan Yan
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, China.,Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yingchi Zhang
- Department of Traumatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Gaohong Sheng
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bowei Ni
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yifan Xiao
- Department of Pathology and Pathophysiology, Medical College, Jianghan University, Wuhan, China
| | - Shanxi Wang
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Tianqi Wang
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yongzhuang Ma
- Department of Orthopedics, Shanxi Bethune Hospital, Taiyuan, China
| | - Huaixi Wang
- Department of Spine and Spinal Cord Surgery, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, China
| | - Hua Wu
- Department of Orthopedics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Chang Tu
- Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, China
| |
Collapse
|
7
|
Ben-Shahar Y, Abassi Z, Pollak Y, Koppelmann T, Gorelik G, Sukhotnik I. Cell death induction (extrinsic versus intrinsic apoptotic pathway) by intestinal ischemia-reperfusion injury in rats is time-depended. Pediatr Surg Int 2021; 37:369-376. [PMID: 33566162 DOI: 10.1007/s00383-020-04817-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/30/2020] [Indexed: 11/27/2022]
Abstract
PURPOSE We investigate the mechanism of intestinal cell apoptosis and its relation to the time of reperfusion in a rat model of intestinal ischemia-reperfusion (IR). METHODS Rats were divided into 4 groups: Sham-24 and Sham-48 rats underwent laparotomy without an intentional ischemic intervention and were sacrificed 24 or 48 h hours later; IR-24 and IR-48 rats underwent occlusion of SMA and portal vein for 20 min followed by 24 or 48 h of reperfusion, respectively. Park's injury score, cell proliferation and apoptosis were determined at sacrifice. Proliferation and apoptosis-related gene and protein expression were determined using Real-Time PCR, Western Blot and Immunohistochemistry. RESULTS IR-24 rats demonstrated a strong increase in cell apoptosis along with an elevated Bax and decreased Bcl-2 expression and a decrease in cell proliferation (vs Sham-24). IR-48 group showed an increase in cell proliferation and a decrease in cell apoptosis compared to IR-24 animals. IR-48 rats demonstrated an increase in apoptotic rate that was accompanied by greater TNF-α mRNA, Fas mRNA and FasL mRNA compared to Sham-48 animals. CONCLUSION While cell apoptosis in IR-24 rats is regulated mainly by intrinsic apoptotic pathway, 48 h followed ischemia extrinsic apoptotic pathway is responsible for pro-apoptotic effects of IR injury.
Collapse
Affiliation(s)
- Yoav Ben-Shahar
- Department of Pediatric Surgery, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann st, 6423906, Tel Aviv, Israel. .,Department of Physiology, The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
| | - Zaid Abassi
- Department of Physiology, The Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Yulia Pollak
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Tal Koppelmann
- Department of Pediatric Surgery, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann st, 6423906, Tel Aviv, Israel
| | - Gregory Gorelik
- Department of Pathology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Igor Sukhotnik
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Pediatric Surgery, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, 6 Weizmann st, 6423906, Tel Aviv, Israel
| |
Collapse
|
8
|
Protective Effect of Biobran/MGN-3 against Sporadic Alzheimer's Disease Mouse Model: Possible Role of Oxidative Stress and Apoptotic Pathways. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:8845064. [PMID: 33574982 PMCID: PMC7857904 DOI: 10.1155/2021/8845064] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 12/14/2020] [Accepted: 01/03/2021] [Indexed: 12/29/2022]
Abstract
Alzheimer's disease (AD) is a debilitating and irreversible brain disease that affects an increasing number of aged individuals, mandating the development of protective nutraceuticals. Biobran/MGN-3, an arabinoxylan from rice bran, has potent antioxidant, antiaging, and immunomodulatory effects. The aim of the present study was to investigate the protective effect of Biobran against sporadic Alzheimer's disease (SAD). SAD was induced in mice via intracerebroventricular injection of streptozotocin (STZ) (3 mg/kg). STZ-treated mice were administered with Biobran for 21 days. The effects of Biobran on memory and learning were measured via the Morris water maze, novel object recognition, and Y-maze tests. Biomarkers for apoptosis, oxidative stress, and amyloidogenesis were measured using ELISA and western blot analysis. Histopathological examination was performed to confirm neuronal damage and amyloid-beta deposition. Biobran reversed the spatial memory deficit in SAD-induced mice, and it increased the expression of glutathione, reduced malondialdehyde, decreased IL-6, decreased intercellular adhesion molecule-1 (ICAM-1), and significantly increased nuclear factor erythroid 2-related factor 2 (Nrf2) and antioxidant response element (ARE). Moreover, Biobran exerted a protective effect against amyloid-beta-induced apoptosis via the suppression of both cleaved caspase-3 and the proapoptotic protein Bax and via the upregulation of the antiapoptotic protein Bcl-2. Furthermore, it reduced the expression of forkhead box class O proteins. It could be concluded from this study that Biobran may be a useful nutritional antioxidant agent for protection against SAD through its activation of the gene expression of Nrf2/ARE, which in turn modulates the apoptotic and amyloidogenic pathways.
Collapse
|
9
|
Xue Y, Li M, Xue Y, Jin W, Han X, Zhang J, Chu X, Li Z, Chu L. Mechanisms underlying the protective effect of tannic acid against arsenic trioxide‑induced cardiotoxicity in rats: Potential involvement of mitochondrial apoptosis. Mol Med Rep 2020; 22:4663-4674. [PMID: 33173965 PMCID: PMC7646850 DOI: 10.3892/mmr.2020.11586] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 09/16/2020] [Indexed: 12/18/2022] Open
Abstract
Arsenic trioxide (ATO) is a frontline chemotherapy drug used in the therapy of acute promyelocytic leukemia. However, the clinical use of ATO is hindered by its cardiotoxicity. The present study aimed to observe the potential effects and underlying mechanisms of tannic acid (TA) against ATO-induced cardiotoxicity. Male rats were intraperitoneally injected with ATO (5 mg/kg/day) to induce cardiotoxicity. TA (20 and 40 mg/kg/day) was administered to evaluate its cardioprotective efficacy against ATO-induced heart injury in rats. Administration of ATO resulted in pathological damage in the heart and increased oxidative stress as well as levels of serum cardiac biomarkers creatine kinase and lactate dehydrogenase and the inflammatory marker NF-κB (p65). Conversely, TA markedly reversed this phenomenon. Additionally, TA treatment caused a notable decrease in the expression levels of cleaved caspase-3/caspase-3, Bax, p53 and Bad, while increasing Bcl-2 expression levels. Notably, the application of TA decreased the expression levels of cytochrome c, second mitochondria-derived activator of caspases and high-temperature requirement A2, which are apoptosis mitochondrial-associated proteins. The present findings indicated that TA protected against ATO-induced cardiotoxicity, which may be associated with oxidative stress, inflammation and mitochondrial apoptosis.
Collapse
Affiliation(s)
- Yucong Xue
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Mengying Li
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Yurun Xue
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Weiyue Jin
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Xue Han
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Jianping Zhang
- School of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Xi Chu
- The Fourth Hospital of Hebei Medical University, Shijiazhuang, Hebei 050011, P.R. China
| | - Ziliang Li
- School of Basic Medicine, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| | - Li Chu
- School of Pharmacy, Hebei University of Chinese Medicine, Shijiazhuang, Hebei 050200, P.R. China
| |
Collapse
|
10
|
He SD, Tan N, Sun CX, Liao KH, Zhu HJ, Luo XG, Zhang JY, Li DY, Huang SG. Treatment with Melittin Induces Apoptosis and Autophagy of Fibroblast-like Synoviocytes in Patients with Rheumatoid Arthritis. Curr Pharm Biotechnol 2020; 21:734-740. [PMID: 31820689 DOI: 10.2174/1389201021666191210110826] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 10/17/2019] [Accepted: 11/21/2019] [Indexed: 01/07/2023]
Abstract
Background:
Melittin, the major medicinal component of honeybee venom, exerts antiinflammatory,
analgesic, and anti-arthritic effects in patients with Rheumatoid Arthritis (RA). RA is an
inflammatory autoimmune joint disease that leads to irreversible joint destruction and functional loss.
Fibroblast-Like Synoviocytes (FLS) are dominant, special mesenchymal cells characterized by the
structure of the synovial intima, playing a crucial role in both the initiation and progression of RA.
Objective:
In this study, we evaluated the effects of melittin on the viability and apoptosis of FLS isolated
from patients with RA.
Methods:
Cell viability was determined using CCK-8 assays; apoptosis was evaluated by flow cytometry,
and the expression levels of apoptosis-related proteins (caspase-3, caspase-9, BAX, and Bcl-2)
were also determined. To explore whether melittin alters inflammatory processes in RA-FLS, IL-1β
levels were determined using an enzyme-linked immunosorbent assay (ELISA). Furthermore, we performed
GFP-LC3 punctate fluorescence dot assays and western blotting (for LC3, ATG5, p62, and Beclin
1) to assess autophagy in RA-FLS.
Results:
Our results show that melittin can significantly impair viability, promote apoptosis and autophagy,
and inhibit IL-1β secretion in RA-FLS.
Conclusion:
Melittin may be useful in preventing damage to the joints during accidental local stimulation.
Collapse
Affiliation(s)
- Shou-di He
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Ning Tan
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Chen-xia Sun
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Kang-han Liao
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Hui-jun Zhu
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Xiao-guang Luo
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Jie-yao Zhang
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - De-yu Li
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| | - Sheng-guang Huang
- Traditional Chinese Medicine Department of Rheumatism, Huazhong University of Science and Techology Union Shenzhen Hospital, Shenzhen Nanshan People's Hospital, Shenzhen 518060, Guangdong, China
| |
Collapse
|
11
|
Bao J, Chen Z, Xu L, Wu L, Xiong Y. Rapamycin protects chondrocytes against IL-18-induced apoptosis and ameliorates rat osteoarthritis. Aging (Albany NY) 2020; 12:5152-5167. [PMID: 32182210 PMCID: PMC7138594 DOI: 10.18632/aging.102937] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 01/27/2020] [Indexed: 12/22/2022]
Abstract
Interleukin 18 (IL-18) promotes inflammation and apoptosis in chondrocytes, thereby contributing to the development and progression of osteoarthritis (OA). Here, we investigated the effects of IL-18 treatment and inhibition in rat chondrocytes in vitro and in vivo. We used RT-PCR and Western blotting to measure the mRNA and protein levels of the chondrocyte-specific genes Collagen II and Aggrecan as well as the protein levels of apoptosis-related (Bax, Bcl2, Caspase3/9), autophagy-related (Atg5, Atg7, Beclin1, LC3), and mTOR pathway-related genes (PI3K, Akt, mTOR). We observed a decrease in Collagen II and Aggrecan mRNA and protein levels, upregulation of chondrocyte apoptosis, downregulation of chondrocyte autophagy, and activation of the PI3K/Akt/mTOR pathway upon IL-18 treatment. PI3K/Akt/mTOR pathway activation and inhibition tests using rat 740Y-P (PI3K activator), SC79 (AKT activator), 3BDO (mTOR activator), or LY294002 (PI3K inhibitor) revealed that activation of the PI3K/Akt/mTOR pathway enhances chondrocyte-specific gene degradation induced by IL-18, while its inhibition has protective effects on chondrocytes. We also found that treatment with rapamycin (a selective mTOR inhibitor) also exerts chondro-protective effects that ameliorate OA by promoting autophagy. These results suggest that inhibition of the mTOR pathway could be exploited for therapeutic benefits in the treatment of OA.
Collapse
Affiliation(s)
- Jiapeng Bao
- Department of Orthopedic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310000, Zhejiang, China
| | - Zhonggai Chen
- Department of Orthopedic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310000, Zhejiang, China
| | - Langhai Xu
- Department of Orthopedic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310000, Zhejiang, China
| | - Lidong Wu
- Department of Orthopedic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310000, Zhejiang, China
| | - Yan Xiong
- Department of Orthopedic Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310000, Zhejiang, China
| |
Collapse
|
12
|
Wan M, Zhang L, Chen Y, Li Q, Fan W, Xue Q, Yan F, Song W. Synthesis and Anticancer Activity Evaluation of Novel Phenanthridine Derivatives. Front Oncol 2019; 9:274. [PMID: 31058081 PMCID: PMC6478010 DOI: 10.3389/fonc.2019.00274] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 03/25/2019] [Indexed: 12/16/2022] Open
Abstract
Based on the structure of sanguinarine, fourteen phenanthridine derivatives were designed and synthesized in the current study. The cytotoxic activities of synthesized compounds were evaluated against five human cancer cell lines (MCF-7, PC3, Hela, A549, and HepG2 cell lines) via MTT assay. Among all the compounds tested, molecule 8a exhibited significant cytotoxic activity against MCF-7 cells with a IC50 value of 0.28 μM. A following up enzymatic assay indicated that compound 8a could inhibit the activity of DNA topoisomerase I/II. Further mechanistic studies performed in the MCF-7 cell line revealed that compound 8a could arrest cell cycle in S phase and induce cell apoptosis via downregulation of Bcl-2 and upregulation of Bax. Collectively, a potent DNA topoisomerase inhibitor (8a) was discovered, which exhibited potential as a candidate chemotherapeutic agent for the management of tumors in the present study.
Collapse
Affiliation(s)
- Minghui Wan
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Lei Zhang
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Yiming Chen
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Qiang Li
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Wenli Fan
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Qingxia Xue
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Fang Yan
- School of Pharmacy, Weifang Medical University, Weifang, China
| | - Weiguo Song
- School of Pharmacy, Weifang Medical University, Weifang, China
| |
Collapse
|
13
|
Endisha H, Rockel J, Jurisica I, Kapoor M. The complex landscape of microRNAs in articular cartilage: biology, pathology, and therapeutic targets. JCI Insight 2018; 3:121630. [PMID: 30185670 DOI: 10.1172/jci.insight.121630] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The disabling degenerative disease osteoarthritis (OA) is prevalent among the global population. Articular cartilage degeneration is a central feature of OA; therefore, a better understanding of the mechanisms that maintain cartilage homeostasis is vital for developing effective therapeutic interventions. MicroRNAs (miRs) modulate cell signaling pathways and various processes in articular cartilage via posttranscriptional repression of target genes. As dysregulated miRs frequently alter the homeostasis of articular cartilage, modulating select miRs presents a potential therapeutic opportunity for OA. Here, we review key miRs that have been shown to modulate cartilage-protective or -destructive mechanisms and signaling pathways. Additionally, we use an integrative computational biology approach to provide insight into predicted miR gene targets that may contribute to OA pathogenesis, and highlight the complexity of miR signaling in OA by generating both unique and overlapping gene targets of miRs that mediate protective or destructive effects. Early OA detection would enable effective prevention; thus, miRs are being explored as diagnostic biomarkers. We discuss these ongoing efforts and the applicability of miR mimics and antisense inhibitors as potential OA therapeutics.
Collapse
Affiliation(s)
- Helal Endisha
- Arthritis Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada.,Division of Genetics and Development, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Department of Surgery and Department of Laboratory Medicine and Pathobiology, University of Toronto, Ontario, Canada
| | - Jason Rockel
- Arthritis Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada.,Division of Genetics and Development, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Igor Jurisica
- Arthritis Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada.,Division of Genetics and Development, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Departments of Medical Biophysics and Computer Science, University of Toronto, Toronto, Ontario, Canada.,Institute of Neuroimmunology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Mohit Kapoor
- Arthritis Program, Toronto Western Hospital, University Health Network, Toronto, Ontario, Canada.,Division of Genetics and Development, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Department of Surgery and Department of Laboratory Medicine and Pathobiology, University of Toronto, Ontario, Canada
| |
Collapse
|
14
|
Deng J, Park D, Wang M, Nooka A, Deng Q, Matulis S, Kaufman J, Lonial S, Boise LH, Galipeau J, Deng X. BCL2-BH4 antagonist BDA-366 suppresses human myeloma growth. Oncotarget 2017; 7:27753-63. [PMID: 27049723 PMCID: PMC5053685 DOI: 10.18632/oncotarget.8513] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Accepted: 03/28/2016] [Indexed: 11/25/2022] Open
Abstract
Multiple myeloma (MM) is a heterogeneous plasma cell malignancy and remains incurable. B-cell lymphoma-2 (BCL2) protein correlates with the survival and the drug resistance of myeloma cells. BH3 mimetics have been developed to disrupt the binding between BCL2 and its pro-apoptotic BCL2 family partners for the treatment of MM, but with limited therapeutic efficacy. We recently identified a small molecule BDA-366 as a BCL2 BH4 domain antagonist, converting it from an anti-apoptotic into a pro-apoptotic molecule. In this study, we demonstrated that BDA-366 induces robust apoptosis in MM cell lines and primary MM cells by inducing BCL2 conformational change. Delivery of BDA-366 substantially suppressed the growth of human MM xenografts in NOD-scid/IL2Rγnull mice, without significant cytotoxic effects on normal hematopoietic cells or body weight. Thus, BDA-366 functions as a novel BH4-based BCL2 inhibitor and offers an entirely new tool for MM therapy.
Collapse
Affiliation(s)
- Jiusheng Deng
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Dongkyoo Park
- Department of Radiation Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Mengchang Wang
- The First Affiliated Hospital, Xi'An Jiaotong University, Xi'An, China
| | - Ajay Nooka
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Qiaoya Deng
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Shannon Matulis
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Jonathan Kaufman
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Sagar Lonial
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Lawrence H Boise
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Jacques Galipeau
- Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| | - Xingming Deng
- Department of Radiation Oncology, Winship Cancer Institute, Emory University, Atlanta, USA
| |
Collapse
|
15
|
Telomerase reverse transcriptase promotes chemoresistance by suppressing cisplatin-dependent apoptosis in osteosarcoma cells. Sci Rep 2017; 7:7070. [PMID: 28765565 PMCID: PMC5539325 DOI: 10.1038/s41598-017-07204-w] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 06/23/2017] [Indexed: 11/18/2022] Open
Abstract
Cisplatin is one of the most efficacious antimitotic drugs used in the treatment of a range of malignant tumors. However, treatment failures are common due to the development of chemoresistance. In addition to its telomere maintenance function, telomerase plays a pro-survival role, inducing decreased apoptosis and increased resistance against DNA damage. Elucidation of the molecular mechanisms underlying this effect is critical to improve treatment outcomes. Previously, our group showed higher telomerase reverse transcriptase(TERT) expression in cisplatin resistant osteosarcoma cells. In this study, confocal fluorescence microscopy experiments revealed that TERT translocates from the nucleus to mitochondria in cisplatin treated osteosarcoma cells. We observed decreased apoptosis rate and improved mitochondrial function in TERT-overexpressing cells following cisplatin treatment. Based on these results, we further established that TERT inhibits cisplatin-induced apoptosis independently of telomerase reverse transcriptase activity. Moreover, TERT suppressed cisplatin-induced apoptosis and improved mitochondrial function via alleviating intracellular ROS in osteosarcoma cells. Our finding that TERT shuttles from the nucleus to the mitochondrion in response to cisplatin treatment and inhibits cisplatin-induced apoptosis in osteosarcoma cells may be especially important to overcome drug resistance.
Collapse
|
16
|
Morciano G, Giorgi C, Balestra D, Marchi S, Perrone D, Pinotti M, Pinton P. Mcl-1 involvement in mitochondrial dynamics is associated with apoptotic cell death. Mol Biol Cell 2015; 27:20-34. [PMID: 26538029 PMCID: PMC4694758 DOI: 10.1091/mbc.e15-01-0028] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 10/29/2015] [Indexed: 01/04/2023] Open
Abstract
The B-cell lymphoma-2 (Bcl-2) family proteins are critical regulators of apoptosis and consist of both proapoptotic and antiapoptotic factors. Within this family, the myeloid cell leukemia factor 1 (Mcl-1) protein exists in two forms as the result of alternative splicing. The long variant (Mcl-1L) acts as an antiapoptotic factor, whereas the short isoform (Mcl-1S) displays proapoptotic activity. In this study, using splice-switching antisense oligonucleotides (ASOs), we increased the synthesis of Mcl-1S, which induced a concurrent reduction of Mcl-1L, resulting in increased sensitivity of cancer cells to apoptotic stimuli. The Mcl-1 ASOs also induced mitochondrial hyperpolarization and a consequent increase in mitochondrial calcium (Ca(2+)) accumulation. The high Mcl-1S/L ratio correlated with significant hyperfusion of the entire mitochondrial network, which occurred in a dynamin-related protein (Drp1)-dependent manner. Our data indicate that the balance between the long and short variants of the Mcl-1 gene represents a key aspect of the regulation of mitochondrial physiology. We propose that the Mcl-1L/S balance is a novel regulatory factor controlling the mitochondrial fusion and fission machinery.
Collapse
Affiliation(s)
- Giampaolo Morciano
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies
| | - Carlotta Giorgi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies
| | - Dario Balestra
- Department of Life Sciences and Biotechnology, University of Ferrara, FE 44121 Ferrara, Italy
| | - Saverio Marchi
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies
| | - Daniela Perrone
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, FE 44121 Ferrara, Italy
| | - Mirko Pinotti
- Department of Life Sciences and Biotechnology, University of Ferrara, FE 44121 Ferrara, Italy
| | - Paolo Pinton
- Department of Morphology, Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, Laboratory for Technologies of Advanced Therapies
| |
Collapse
|
17
|
Sukhotnik I, Nativ O, Roitburt A, Bejar D, Coran AG, Mogilner JG, Nativ O. Methotrexate induces germ cell apoptosis and impairs spermatogenesis in a rat. Pediatr Surg Int 2013; 29:179-84. [PMID: 23224566 DOI: 10.1007/s00383-012-3197-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
PURPOSE The primary toxic effects of methotrexate (MTX) are myelosuppression and/or intestinal mucositis. The objective of the present study is to investigate the effect of MTX on germ cell apoptosis and spermatogenesis in a rat. METHODS Male Sprague-Dawley rats were divided into three experimental groups: control rats treated with vehicle; MTX-2 rats treated with one dose (20 μg/kg) of MTX given IP and killed on the second day; and MTX rats treated with IP MTX (20 μg/kg) and killed on day 4. Johnsen's criteria and the number of germinal cell layers in the testes were used to categorize the spermatogenesis. TUNEL assay was used to determine germ cell apoptosis. Western blotting was used to determine Bax and Bcl-2 protein levels. Statistical analysis was performed using the non-parametric Kruskal-Wallis ANOVA test, with p less than 0.05 considered statistically significant. RESULTS On day 2, MTX-treated animals demonstrated minimal changes in the histological parameters of spermatogenesis, but germ cell apoptosis increased significantly (threefold increase, p = 0.002) compared to control rats. On day 4, MTX-treated rats demonstrated a trend toward a decrease in germ cell apoptosis, compared to day 2, and showed histological signs of impaired spermatogenesis (decreased number of germ cell layers and Johnsen's criteria). A significant increase in cell apoptosis in MTX-treated rats was correlated with higher Bax/Bcl-2 protein levels. CONCLUSIONS MTX induced germ cell apoptosis and impaired spermatogenesis in rat testes.
Collapse
Affiliation(s)
- Igor Sukhotnik
- The Bruce Rappaport Faculty of Medicine, Laboratory of Intestinal Adaptation and Recovery, Technion-Israel Institute of Technology, Haifa, Israel.
| | | | | | | | | | | | | |
Collapse
|
18
|
Li Y, Gu WJ, Liu HL. Induction of pancreatic cancer cell apoptosis and enhancement of gemcitabine sensitivity by RAP80 siRNA. Dig Dis Sci 2012; 57:2072-8. [PMID: 22573342 DOI: 10.1007/s10620-012-2132-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Accepted: 03/02/2012] [Indexed: 12/20/2022]
Abstract
BACKGROUND Receptor-associated protein 80 (RAP80) increases substantially in pancreatic cancer. The involvement of RAP80 in the chemoresistance of pancreatic cancer should be elucidated. AIMS We investigated the effects of inhibiting RAP80 expression on the sensitivity of pancreatic cancer cells to gemcitabine chemotherapy by using small interfering RNA (siRNA). METHODS Chemically synthesized siRNA RAP80 was transfected into human pancreatic cancer cell lines SW1990 and Capan-2. The IC(50) of gemcitabine was determined by using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay. Cell apoptosis was detected by using flow cytometry. Expression of apoptosis-related genes, Bax, Bcl-2, TRAIL, survivin, and caspase-8 was detected by using reverse transcription-polymerase chain reaction (RT-PCR) and western blot. RESULTS Gemcitabine inhibits proliferation of SW1990 and Capan-2 cells in a concentration-dependent manner. Inhibition of RAP80 expression significantly reduced the IC(50) of gemcitabine (P < 0.01). RAP80 siRNA combined with gemcitabine significantly increased (P < 0.01) apoptosis of pancreatic cancer cell lines SW1990 and Capan-2, increased expression of Bax mRNA, reduced Bcl-2 mRNA expression (P < 0.01), and slightly increased TRAIL mRNA expression (P < 0.01). Correspondingly, in the RAP80 siRNA combined with gemcitabine group, both Bax and cleaved caspase-8 protein levels were increased (P < 0.01), whereas Bcl-2 protein decreased significantly (P < 0.01). No change in survivin mRNA expression was observed (P < 0.01). CONCLUSION Inhibition of RAP80 expression can induce apoptosis in pancreatic cancer cells and improve chemosensitivity to gemcitabine.
Collapse
Affiliation(s)
- Ya Li
- Department of Gastroenterology, The Ninth People's Hospital, School of Medicine, Shanghai JiaoTong University, Shanghai 200011, China
| | | | | |
Collapse
|
19
|
Chang CF, D'Souza WN, Ch'en IL, Pages G, Pouyssegur J, Hedrick SM. Polar opposites: Erk direction of CD4 T cell subsets. THE JOURNAL OF IMMUNOLOGY 2012; 189:721-31. [PMID: 22675204 DOI: 10.4049/jimmunol.1103015] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Effective immune responses depend upon appropriate T cell differentiation in accord with the nature of an infectious agent, and the contingency of differentiation depends minimally on TCR, coreceptor, and cytokine signals. In this reverse genetic study, we show that the MAPK Erk2 is not essential for T cell proliferation in the presence of optimum costimulation. Instead, it has opposite effects on T-bet and Gata3 expression and, hence, on Th1 and Th2 differentiation. Alternatively, in the presence of TGF-β, the Erk pathway suppresses a large program of gene expression, effectively limiting the differentiation of Foxp3(+) regulatory T cells. In the latter case, the mechanisms involved include suppression of Gata3 and Foxp3, induction of Tbx21, phosphorylation of Smad2,3, and possibly suppression of Socs2, a positive inducer of Stat5 signaling. Consequently, loss of Erk2 severely impeded Th1 differentiation while enhancing the development of Foxp3(+)-induced T regulatory cells. Selected profiles of gene expression under multiple conditions of T cell activation illustrate the opposing consequences of Erk pathway signaling.
Collapse
|
20
|
Stromnes IM, Blattman JN, Tan X, Jeevanjee S, Gu H, Greenberg PD. Abrogating Cbl-b in effector CD8(+) T cells improves the efficacy of adoptive therapy of leukemia in mice. J Clin Invest 2010; 120:3722-34. [PMID: 20890046 DOI: 10.1172/jci41991] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Accepted: 07/28/2010] [Indexed: 01/28/2023] Open
Abstract
The clinical use of adoptive immunotherapy with tumor-reactive T cells to treat established cancers is limited in part by the poor in vivo survival and function of the transferred T cells. Although administration of exogenous cytokines such as IL-2 can promote T cell survival, such strategies have many nonspecific activities and are often associated with toxicity. We show here that abrogating expression of Casitas B-lineage lymphoma b (Cbl-b), a negative regulator of lymphocyte activation, in tumor-reactive CD8(+) T cells expanded ex vivo increased the efficacy of adoptive immunotherapy of disseminated leukemia in mice. Mechanistically, Cbl-b abrogation bypassed the requirement for exogenous IL-2 administration for tumor eradication in vivo. In addition, CD8(+) T cells lacking Cbl-b demonstrated a lower threshold for activation, better survival following target recognition and stimulation, and enhanced proliferative responses as a result of both IL-2-dependent and -independent pathways. Importantly, siRNA knockdown of Cbl-b in human CD8(+)CD28- effector T cell clones similarly restored IL-2 production and proliferation following target recognition independent of exogenous IL-2, enhanced IFN-γ production, and increased target avidity. Thus, abrogating Cbl-b expression in effector T cells may improve the efficacy of adoptive therapy of some human malignancies.
Collapse
Affiliation(s)
- Ingunn M Stromnes
- Department of Immunology, University of Washington, Seattle, Washington 98195-6425, USA
| | | | | | | | | | | |
Collapse
|
21
|
Huang XY, Wang HC, Yuan Z, Li A, He ML, Ai KX, Zheng Q, Qin HL. Gemcitabine combined with gum mastic causes potent growth inhibition and apoptosis of pancreatic cancer cells. Acta Pharmacol Sin 2010; 31:741-5. [PMID: 20523344 DOI: 10.1038/aps.2010.54] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
AIM To investigate the antiproliferative and apoptotic effects of gemcitabine combined with gum mastic and the underlying mechanisms in human pancreatic cancer cell lines. METHODS Cell proliferation and apoptosis were examined using the methyl thiazolyl tetrazolium (MTT) assay and propidium iodine staining, respectively. The expression of Bcl-2, Bax, NF-kappaB p65 subunit, and IkappaBalpha protein was measured using Western blotting. RESULTS Gemcitabine 0.01-100 microg/mL inhibited cell proliferation and induced apoptosis in both pancreatic cancer BxPC-3 and COLO 357 cells. Gum mastic 40 microg/mL significantly potentiated the antiproliferative and apoptotic effects of gemcitabine 10 microg/mL after 72-h treatment. When cells were treated with gemcitabine in combination with gum mastic, the IkappaBalpha level was increased, whereas NF-kappaB activation was blocked; the expression of Bax protein was substantially increased, but Bcl-2 protein was down-regulated. CONCLUSION Gemcitabine combined with gum mastic causes potent apoptosis in pancreatic cancer cells. The combination may be an effective therapeutic strategy for pancreatic cancer.
Collapse
|
22
|
Cerda SR, Mustafi R, Little H, Cohen G, Khare S, Moore C, Majumder P, Bissonnette M. Protein kinase C delta inhibits Caco-2 cell proliferation by selective changes in cell cycle and cell death regulators. Oncogene 2006; 25:3123-38. [PMID: 16434969 DOI: 10.1038/sj.onc.1209360] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PKC-delta is a serine/threonine kinase that mediates diverse signal transduction pathways. We previously demonstrated that overexpression of PKC-delta slowed the G1 progression of Caco-2 colon cancer cells, accelerated apoptosis, and induced cellular differentiation. In this study, we further characterized the PKC-delta dependent signaling pathways involved in these tumor suppressor actions in Caco-2 cells overexpressing PKC-delta using a Zn2+ inducible expression vector. Consistent with a G1 arrest, increased expression of PKC-delta caused rapid and significant downregulation of cyclin D1 and cyclin E proteins (50% decreases, P<0.05), while mRNA levels remained unchanged. The PKC agonist, phorbol 12-myristate 13-acetate (TPA, 100 nM, 4 h), induced two-fold higher protein and mRNA levels of p21(Waf1), a cyclin-dependent kinase (cdk) inhibitor in PKC-delta transfectants compared with empty vector (EV) transfected cells, whereas the PKC-delta specific inhibitor rottlerin (3 microM) or knockdown of this isoenzyme with specific siRNA oligonucleotides blocked p21(Waf1) expression. Concomitantly, compared to EV control cells, PKC-delta upregulation decreased cyclin D1 and cyclin E proteins co-immunoprecipitating with cdk6 and cdk2, respectively. In addition, overexpression of PKC-delta increased binding of cdk inhibitor p27(Kip1) to cdk4. These alterations in cyclin-cdks and their inhibitors are predicted to decrease G1 cyclin kinase activity. As an independent confirmation of the direct role PKC-delta plays in cell growth and cell cycle regulation, we knocked down PKC-delta using specific siRNA oligonucleotides. PKC-delta specific siRNA oligonucleotides, but not irrelevant control oligonucleotides, inhibited PKC-delta protein by more than 80% in Caco-2 cells. Moreover, PKC-delta knockdown enhanced cell proliferation ( approximately 1.4-2-fold, P<0.05) and concomitantly increased cyclin D1 and cyclin E expression ( approximately 1.7-fold, P<0.05). This was a specific effect, as nontargeted PKC-zeta was not changed by PKC-delta siRNA oligonucleotides. Consistent with accelerated apoptosis in PKC-delta transfectants, compared to EV cells, PKC-delta upregulation increased proapoptotic regulator Bax two-fold at mRNA and protein levels, while antiapoptotic Bcl-2 protein was decreased by 50% at a post-transcriptional level. PKC-delta specific siRNA oligonucleotides inhibited Bax protein expression by more than 50%, indicating that PKC-delta regulates apoptosis through Bax. Taken together, these results elucidate two critical mechanisms regulated by PKC-delta that inhibit cell cycle progression and enhance apoptosis in colon cancer cells. We postulate these antiproliferative pathways mediate an important tumor suppressor function for PKC-delta in colonic carcinogenesis.
Collapse
Affiliation(s)
- S R Cerda
- Department of Medicine, Division of Gastroenterology, University of Chicago, Chicago, IL 60637, USA.
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Berger C, Flowers ME, Warren EH, Riddell SR. Analysis of transgene-specific immune responses that limit the in vivo persistence of adoptively transferred HSV-TK-modified donor T cells after allogeneic hematopoietic cell transplantation. Blood 2005; 107:2294-302. [PMID: 16282341 PMCID: PMC1895724 DOI: 10.1182/blood-2005-08-3503] [Citation(s) in RCA: 275] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The introduction of an inducible suicide gene such as the herpes simplex virus thymidine kinase (HSV-TK) might allow exploitation of the antitumor activity of donor T cells after allogeneic hematopoietic cell transplantation (HCT) without graft versus host disease. However, HSV-TK is foreign, and immune responses to gene-modified T cells could lead to their premature elimination. We show that after the infusion of HSV-TK-modified donor T cells to HCT recipients, CD8+ and CD4+ T-cell responses to HSV-TK are rapidly induced and coincide with the disappearance of transferred cells. Cytokine flow cytometry using an overlapping panel of HSV-TK peptides allowed rapid detection and quantitation of HSV-TK-specific T cells in the blood and identified multiple immunogenic epitopes. Repeated infusion of modified T cells boosted the induced HSV-TK-specific T cells, which persisted as memory cells. These studies demonstrate the need for nonimmunogenic suicide genes and identify a strategy for detection of CD4+ and CD8+ T-cell responses to transgene products that should be generally applicable to monitoring patients on gene therapy trials. The potency of gene-modified T cells to elicit robust and durable immune responses imply this approach might be used for vaccination to elicit T-cell responses to viral or tumor antigens.
Collapse
Affiliation(s)
- Carolina Berger
- Fred Hutchinson Cancer Research Center, Clinical Research Division, Seattle, Washington 98109, USA.
| | | | | | | |
Collapse
|
24
|
Shehata MF. Rel/Nuclear factor-kappa B apoptosis pathways in human cervical cancer cells. Cancer Cell Int 2005; 5:10. [PMID: 15857509 PMCID: PMC1090600 DOI: 10.1186/1475-2867-5-10] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2005] [Accepted: 04/27/2005] [Indexed: 01/08/2023] Open
Abstract
Cervical cancer is considered a common yet preventable cause of death in women. It has been estimated that about 420 women out of the 1400 women diagnosed with cervical cancer will die during 5 years from diagnosis. This review addresses the pathogenesis of cervical cancer in humans with a special emphasis on the human papilloma virus as a predominant cause of cervical cancer in humans. The current understanding of apoptosis and regulators of apoptosis as well as their implication in carcinogenesis will follow. A special focus will be given to the role of Rel/NF-kappaB family of genes in the growth and chemotherapeutic treatment of the malignant HeLa cervical cells emphasizing on Xrel3, a cRel homologue.
Collapse
Affiliation(s)
- Marlene F Shehata
- Division of Basic Sciences, Faculty of Medicine, Memorial University of Newfoundland, St, John's, A1B 3V6, Canada.
| |
Collapse
|
25
|
Graham RM, Frazier DP, Thompson JW, Haliko S, Li H, Wasserlauf BJ, Spiga MG, Bishopric NH, Webster KA. A unique pathway of cardiac myocyte death caused by hypoxia-acidosis. ACTA ACUST UNITED AC 2004; 207:3189-200. [PMID: 15299040 DOI: 10.1242/jeb.01109] [Citation(s) in RCA: 148] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Chronic hypoxia in the presence of high glucose leads to progressive acidosis of cardiac myocytes in culture. The condition parallels myocardial ischemia in vivo, where ischemic tissue becomes rapidly hypoxic and acidotic. Cardiac myocytes are resistant to chronic hypoxia at neutral pH but undergo extensive death when the extracellular pH (pH[o]) drops below 6.5. A microarray analysis of 20 000 genes (cDNAs and expressed sequence tags) screened with cDNAs from aerobic and hypoxic cardiac myocytes identified >100 genes that were induced by >2-fold and approximately 20 genes that were induced by >5-fold. One of the most strongly induced transcripts was identified as the gene encoding the pro-apoptotic Bcl-2 family member BNIP3. Northern and western blot analyses confirmed that BNIP3 was induced by 12-fold (mRNA) and 6-fold (protein) during 24 h of hypoxia. BNIP3 protein, but not the mRNA, accumulated 3.5-fold more rapidly under hypoxia-acidosis. Cell fractionation experiments indicated that BNIP3 was loosely bound to mitochondria under conditions of neutral hypoxia but was translocated into the membrane when the myocytes were acidotic. Translocation of BNIP3 coincided with opening of the mitochondrial permeability pore (MPTP). Paradoxically, mitochondrial pore opening did not promote caspase activation, and broad-range caspase inhibitors do not block this cell death pathway. The pathway was blocked by antisense BNIP3 oligonucleotides and MPTP inhibitors. Therefore, cardiac myocyte death during hypoxia-acidosis involves two distinct steps: (1) hypoxia activates transcription of the death-promoting BNIP3 gene through a hypoxia-inducible factor-1 (HIF-1) site in the promoter and (2) acidosis activates BNIP3 by promoting membrane translocation. This is an atypical programmed death pathway involving a combination of the features of apoptosis and necrosis. In this article, we will review the evidence for this unique pathway of cell death and discuss its relevance to ischemic heart disease. The article also contains new evidence that chronic hypoxia at neutral pH does not promote apoptosis or activate caspases in neonatal cardiac myocytes.
Collapse
Affiliation(s)
- Regina M Graham
- Department of Molecular and Cellular Pharmacology and the Vascular Biology Institute, University of Miami Medical Center, Miami, FL 33101, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Kamachi M, Le TM, Kim SJ, Geiger ME, Anderson P, Utz PJ. Human autoimmune sera as molecular probes for the identification of an autoantigen kinase signaling pathway. J Exp Med 2002; 196:1213-25. [PMID: 12417631 PMCID: PMC2194102 DOI: 10.1084/jem.20021167] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Using human autoimmune sera as molecular probes, we previously described the association of phosphorylated serine/arginine splicing factors (SR splicing factors) with the U1-small nuclear ribonucleoprotein (U1-snRNP) and U3-small nucleolar RNP (snoRNP) in apoptotic cells. SR proteins are highly conserved autoantigens whose activity is tightly regulated by reversible phosphorylation of serine residues by at least eight different SR protein kinase kinases (SRPKs), including SRPK1, SRPK2, and the scleroderma autoantigen topoisomerase I. In this report, we demonstrate that only one of the known SRPKs, SRPK1, is associated with the U1-snRNP autoantigen complex in healthy and apoptotic cells. SRPK1 is activated early during apoptosis, followed by caspase-mediated proteolytic inactivation at later time points. SRPKs are cleaved in vivo after multiple apoptotic stimuli, and cleavage can be inhibited by overexpression of bcl-2 and bcl-x(L), and by exposure to soluble peptide caspase inhibitors. Incubation of recombinant caspases with in vitro-translated SRPKs demonstrates that SRPK1 and SRPK2 are in vitro substrates for caspases-8 and -9, respectively. In contrast, topoisomerase I is cleaved by downstream caspases (-3 and -6). Since each of these SRPKs sits at a distinct checkpoint in the caspase cascade, SRPKs may serve an important role in signaling pathways governing apoptosis, alternative mRNA splicing, SR protein trafficking, RNA stability, and possibly the generation of autoantibodies directed against splicing factors.
Collapse
Affiliation(s)
- Makoto Kamachi
- Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | | | | | | | | | | |
Collapse
|
27
|
Chu D, Qiu J, Grafe M, Fabian R, Kent TA, Rassin D, Nesic O, Werrbach-Perez K, Perez-Polo R. Delayed cell death signaling in traumatized central nervous system: hypoxia. Neurochem Res 2002; 27:97-106. [PMID: 11926281 DOI: 10.1023/a:1014858707218] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
There are two different ways for cells to die: necrosis and apoptosis. Cell death has traditionally been described as necrotic or apoptotic based on morphological criteria. There are controversy about the respective roles of apoptosis and necrosis in cell death resulting from trauma to the central nervous system (CNS). An evaluation of work published since 1997 in which electron microscopy was applied to ascertain the role of apoptosis and necrosis in: spinal cord injury, stroke, and hypoxia/ischemia (H/I) showed evidence for necrosis and apoptosis based on DNA degradation, presence of histones in cytoplasm, and morphological evidence in spinal cord. In the aftermath of stroke, many of the biochemical markers for apoptosis were present but the morphological determinations suggested that necrosis is the major source of post-traumatic cell death. This was not the case in H/I where both biochemical assays and the morphological studies gave more consistent results in a manner similar to the spinal cord injury studies. After H/I, major factors affecting cell death outcomes are DNA damage and repair processes, expression of bcl-like gene products and inflammation-triggered cytokine production.
Collapse
Affiliation(s)
- Danielle Chu
- Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch, Galveston, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Bentz BG, Chandra R, Haines GK, Robinson AM, Shah P, Radosevich JA. Nitric oxide and apoptosis during human head and neck squamous cell carcinoma development. Am J Otolaryngol 2002; 23:4-11. [PMID: 11791242 DOI: 10.1053/ajot.2002.28772] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
PURPOSE Apoptosis index (AI), Bcl-2, and Bax have shown prognostic significance in head and neck squamous cell carcinoma (HNSCCa). Other areas of research have implicated nitric oxide (NO) or its various intermediate species in both proapoptotic and antiapoptotic processes. We have previously shown that NO-generating enzymes are significantly increased during the stepwise progression to HNSCCa. The aim of this study was to explore the interrelationship of NO and a known consequence of NO-related oxidative stress, apoptosis, during this step-wise process. MATERIALS AND METHODS Formalin fixed-paraffin embedded tissue samples of 10 normal oral mucosa, 15 reactive/dysplastic lesions, and 17 HNSCCa lesions studied previously were subjected to the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP labeling (TUNEL) assay as well as immunohistochemical staining against Bcl-2, Bax, and p53. Patient charts were reviewed and clinical data were compared. The study pathologist (G.K.H) reviewed these slides blinded to patient identifiers or clinical data. The number of immunopositive cell nuclei or staining intensity was graded, noting the pattern of immunostaining. These staining characteristics were compared with the results of immunostaining previously obtained for endothelial constitutive NO synthase (ecNOS) and nitrotyrosine. RESULTS Compared with normal oral mucosa, the AI, Bcl-2, Bax, Bcl-2/Bax intensity and frequency ratios, and mutant p53 intensity significantly changed in reactive/dysplastic and HNSCCa lesions (P <.001 for all). Correlations between the staining characteristics of the antigens studied are presented. Furthermore, perilesional inflammatory cells showed staining in the TUNEL assay. CONCLUSIONS In a set of tissue samples previously well characterized, these new findings implicate a link between NO and the induction of apoptotic cell death in HNSCCa development.
Collapse
Affiliation(s)
- Brandon G Bentz
- Department of Otolaryngology-Head & Neck Surgery, Northwestern University Medical Center, 303 East Chicago Ave., Chicago, IL 60611-3008, USA
| | | | | | | | | | | |
Collapse
|
29
|
Di Renzo M, Serrano D, Zhou Z, George I, Becker K, Cunningham-Rundles C. Enhanced T cell apoptosis in common variable immunodeficiency: negative role of the fas/fasligand system and of the Bcl-2 family proteins and possible role of TNF-RS. Clin Exp Immunol 2001; 125:117-22. [PMID: 11472434 PMCID: PMC1906110 DOI: 10.1046/j.1365-2249.2001.01560.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
CVI is a primary immunodeficiency characterized by a failure of B cell differentiation associated with an array of T cell defects, such as enhanced T cell apoptosis. In this study we investigated the mechanisms underlying CVI enhanced T cell death. We analysed both the expression of Fas using flow cytometry techniques and the expression of FasL mRNA using RT-PCR in CVI T cells. We could not find any significant differences between CVI and normal subjects with regard to Fas expression, although there was a subgroup of CVI patients with very high Fas expression which was accompanied by an up-regulation of FasL mRNA. However, attempts to induce Fas-mediated apoptosis in these high Fas expressing cells, as evaluated by propidium iodide staining and APO2.7 staining, were unsuccessful. We also investigated intracellular levels of Bcl-2, bcl-xl and bax in CD4(+) and CD8(+) CVI T cells, as well as the bax/Bcl-2 ratio, using flow cytometry techniques but could not detect any differences between CVI and normal subjects. Finally we analysed TNF-RI and TNF-RII mRNA expression in CD4(+) and CD8(+) CVI T cells using semiquantitative RT-PCR and found a significant increase in expression of both TNF-Rs in CD4(+) T cells from CVI patients. Our data suggest that the increased expression of both TNF-Rs on T cells may be one of the mechanisms responsible for the accelerated T cell apoptosis in CVI.
Collapse
Affiliation(s)
- M Di Renzo
- Division of Clinical Immunology, The Mount Sinai Medical Center, 1425 Madison Avenue, New York City, New York, USA.
| | | | | | | | | | | |
Collapse
|
30
|
Pinton P, Ferrari D, Rapizzi E, Virgilio FD, Pozzan T, Rizzuto R. The Ca2+ concentration of the endoplasmic reticulum is a key determinant of ceramide-induced apoptosis: significance for the molecular mechanism of Bcl-2 action. EMBO J 2001; 20:2690-701. [PMID: 11387204 PMCID: PMC125256 DOI: 10.1093/emboj/20.11.2690] [Citation(s) in RCA: 488] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2001] [Revised: 04/09/2001] [Accepted: 04/12/2001] [Indexed: 12/31/2022] Open
Abstract
The mechanism of action of the anti-apoptotic oncogene Bcl-2 is still largely obscure. We have recently shown that the overexpression of Bcl-2 in HeLa cells reduces the Ca2+ concentration in the endoplasmic reticulum ([Ca2+]er) by increasing the passive Ca2+ leak from the organelle. To investigate whether this Ca2+ depletion is part of the mechanism of action of Bcl-2, we mimicked the Bcl-2 effect on [Ca2+]er by different pharmacological and molecular approaches. All conditions that lowered [Ca2+]er protected HeLa cells from ceramide, a Bcl-2-sensitive apoptotic stimulus, while treatments that increased [Ca2+]er had the opposite effect. Surprisingly, ceramide itself caused the release of Ca2+ from the endoplasmic reticulum and thus [Ca2+] increased both in the cytosol and in the mitochondrial matrix, paralleled by marked alterations in mitochondria morphology. The reduction of [Ca2+]er levels, as well as the buffering of cytoplasmic [Ca2+] changes, prevented mitochondrial damage and protected cells from apoptosis. It is therefore concluded that the Bcl-2-dependent reduction of [Ca2+]er is an important component of the anti-apoptotic program controlled by this oncogene.
Collapse
Affiliation(s)
| | - Davide Ferrari
- Department of Biomedical Sciences and CNR Center for the Study of Biomembranes, University of Padova, Via Colombo 3, I-35121 Padova and
Department of Experimental and Diagnostic Medicine, Section of General Pathology and Center for the Study of Inflammatory Diseases, Via Borsari 46, I-44100 Ferrara, Italy Corresponding author e-mail: P.Pinton and D.Ferrari contributed equally to this work
| | - Elena Rapizzi
- Department of Biomedical Sciences and CNR Center for the Study of Biomembranes, University of Padova, Via Colombo 3, I-35121 Padova and
Department of Experimental and Diagnostic Medicine, Section of General Pathology and Center for the Study of Inflammatory Diseases, Via Borsari 46, I-44100 Ferrara, Italy Corresponding author e-mail: P.Pinton and D.Ferrari contributed equally to this work
| | - Francesco Di Virgilio
- Department of Biomedical Sciences and CNR Center for the Study of Biomembranes, University of Padova, Via Colombo 3, I-35121 Padova and
Department of Experimental and Diagnostic Medicine, Section of General Pathology and Center for the Study of Inflammatory Diseases, Via Borsari 46, I-44100 Ferrara, Italy Corresponding author e-mail: P.Pinton and D.Ferrari contributed equally to this work
| | | | - Rosario Rizzuto
- Department of Biomedical Sciences and CNR Center for the Study of Biomembranes, University of Padova, Via Colombo 3, I-35121 Padova and
Department of Experimental and Diagnostic Medicine, Section of General Pathology and Center for the Study of Inflammatory Diseases, Via Borsari 46, I-44100 Ferrara, Italy Corresponding author e-mail: P.Pinton and D.Ferrari contributed equally to this work
| |
Collapse
|
31
|
Glasgow JN, Qiu J, Rassin D, Grafe M, Wood T, Perez-Pol JR. Transcriptional regulation of the BCL-X gene by NF-kappaB is an element of hypoxic responses in the rat brain. Neurochem Res 2001; 26:647-59. [PMID: 11519724 DOI: 10.1023/a:1010987220034] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Signal transduction pathways that mediate neuronal commitment to apoptosis involve the nuclear factor kappa B (NF-kappaB) transcription factor. The bcl-x gene is a member of the bcl-2 family of genes that regulate apoptosis, and gives rise to two proteins, Bcl-XL and Bcl-XS, via alternative mRNA splicing. BCl-XL protein, like Bcl-2, is a dominant inhibitor of apoptotic cell death, whereas Bcl-XS promotes apoptosis. While there is high expression of Bcl-XL in the developing and adult brain, few transcriptional control elements have been identified in the bcl-x promoter. There are two functional nuclear factor-kappa B (NF-kappaB) DNA binding sites clustered upstream of the brain-specific transcription start site in the upstream promoter region of murine bcl-x. Recombinant NF-kappaB proteins bind to these sites. Also NF-kappaB overexpression, coupled with bcl-x promoter/reporter assays using a series of murine bcl-x promoter and deletion mutants, has identified the downstream 1.1kb of the bcl-x promoter as necessary for basal promoter activity and induction by NF-kappaB in support of the hypothesis that NF-kappaB can act to enhance BCl-XL expression via highly selective interactions with the bcl-x promoter, where NF-kappaB binding and promoter activation are dependent on specific DNA binding site sequences and NF-kappaB protein dimer composition. Hypoxia induces apoptosis in the hippocampus where the NF-kappaB dimers c-Rel/p50 and p50/pS0 bind to the bcl-x promoter NF-kappaB site.
Collapse
Affiliation(s)
- J N Glasgow
- Department of Human Biological Chemistry and Genetics, University of Texas Medical Branch, Galveston 77555-0652, USA
| | | | | | | | | | | |
Collapse
|
32
|
Affiliation(s)
- K Migita
- First Department of Internal Medicine, Nagasaki University School of Medicine, Nagasaki, Japan.
| | | |
Collapse
|
33
|
Mandal M, Olson DJ, Sharma T, Vadlamudi RK, Kumar R. Butyric acid induces apoptosis by up-regulating Bax expression via stimulation of the c-Jun N-terminal kinase/activation protein-1 pathway in human colon cancer cells. Gastroenterology 2001; 120:71-8. [PMID: 11208715 DOI: 10.1053/gast.2001.20897] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS The colonic epithelial cells near the top of the crypt have been shown to undergo apoptosis. Because butyric acid (BA) is the major short-chain fatty acid produced by fermentation of dietary fiber in the large bowel, it may be an important regulator of apoptosis in colorectal cancer. We investigated which signaling pathway is triggered by BA to undergo apoptosis in human colorectal cancer cells. METHODS Human DiFi and FET colorectal cells were treated with BA to undergo apoptosis and were assayed for activation of c-Jun N-terminal kinase (JNK), transcription factor activation protein 1 (AP1) and NF-kappaB, and the proapoptotic molecule Bax. The contribution of specific pathways was assessed by examining the effects of dominant-negative mutants of JNK/AP1 or NF-kappaB on BA-induced Bax expression and apoptosis. RESULTS BA-mediated DNA fragmentation and Bax induction were preceded by early stimulation of JNK, and the DNA-binding activities of AP1 and NF-kappaB. BA-induced enhancement of DNA fragmentation and stimulation of Bax promoter activity were blocked by the expression of dominant-negative mutants of JNK1 or AP1 but not NF-kappaB. CONCLUSIONS These findings suggest that apoptosis triggered by BA involves transcriptional stimulation of the Bax gene via activation of the JNK/AP1 pathway in colonic epithelial cells.
Collapse
Affiliation(s)
- M Mandal
- University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
| | | | | | | | | |
Collapse
|
34
|
Tan YJ, Ting AE. Non-ionic detergent affects the conformation of a functionally active mutant of Bcl-X(L). PROTEIN ENGINEERING 2000; 13:887-92. [PMID: 11239089 DOI: 10.1093/protein/13.12.887] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We found that a mutant, Bcl-X(L)(F131V), which was previously reported to have impaired binding capacity, can bind to Bax almost as strongly as wild-type Bcl-X(L). In the absence of detergent, the Bcl-X(L)(F131V) mutant adopts the same conformation as wild-type Bcl-X(L), as determined by circular dichroism spectroscopy and size-exclusion chromatography. However, non-ionic detergent induces a conformational change in the Bcl-X(L)(F131V) mutant and causes it to lose Bax-binding capacity. Wild-type Bcl-X(L), on the other hand, is more resistant to detergent-induced effects and retains its ability to bind Bax in the presence of detergent. Since it has been shown that the Bcl-X(L)(F131V) mutant has nearly the same anti-apoptotic activity as wild-type Bcl-X(L), it would be likely that the Bcl-X(L)(F131V) mutant can adopt the wild-type conformation, rather than the detergent-induced conformational state and can bind to Bax in vivo. Therefore, our data demonstrated that non-ionic detergent can have unpredicted effects on protein conformation, differential effects on wild-type and mutant Bcl-X(L) proteins in this case and may cause complications in the interpretation of in vitro binding studies.
Collapse
Affiliation(s)
- Y J Tan
- Institute of Molecular and Cell Biology, 30 Medical Drive, Singapore 117609, Republic of Singapore.
| | | |
Collapse
|
35
|
Peptide bioregulators inhibit apoptosis. Bull Exp Biol Med 2000. [DOI: 10.1007/bf02682019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
36
|
Morgan SE, Kim R, Wang PC, Bhat UG, Kusumoto H, Lu T, Beck WT. Differences in mutant p53 protein stability and functional activity in teniposide-sensitive and -resistant human leukemic CEM cells. Oncogene 2000; 19:5010-9. [PMID: 11042688 DOI: 10.1038/sj.onc.1203865] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2000] [Revised: 08/14/2000] [Accepted: 08/14/2000] [Indexed: 11/09/2022]
Abstract
We examined p53 protein stability and DNA damage-induced p53-dependent responses in a human leukemic CEM cell line and two teniposide-resistant sublines, CEM/VM-1 and CEM/VM-1-5 ( approximately 40 and 400-fold resistant to teniposide, respectively). Although all cell lines contain the same p53 mutations at codons 175 (Arg-->His) and 248 (Arg-->Gln), the constitutive levels of p53 were progressively increased with the resistance of the cells to teniposide. By pulse-chase experiments, we found that the half-lives of mutant p53 protein were approximately 12, 17, and >30 h in CEM, CEM/VM-1, and CEM/VM-1-5 cells, respectively. The prolonged half-lives of p53 in these cells is consistent with the fact that the protein harbors the indicated mutations. Of note, however, is the fact that the increased p53 protein half-lives in the two drug-resistant cell lines corresponds to a proportional decrease in MDM2 protein levels but an increase in p53-MDM2 binding interactions. This suggests that MDM2-mediated p53 degradation may be altered in our leukemic cell lines. The DNA damage-induced p53 response is fully functional in the drug-sensitive CEM cells containing a mutant p53, but this pathway is attenuated in the drug-resistant cells. Specifically, while the mutant p53 was phosphorylated at serine-15 in response to ionizing radiation in all these cell lines, mutant p53 induction in response to teniposide or ionizing radiation and induction of the p53-target genes, p21 and GADD45 only occurred in the drug-sensitive CEM cells. As assessed by MTT cytotoxicity assay, CEM cells were also significantly more sensitive to ionizing radiation, compared to the drug-resistant cell lines, and this correlated with p53 induction. Collectively, these results suggest that changes in constitutive mutant p53 protein levels, p53-MDM2 binding interactions, and altered regulation of the DNA damage-inducible p53-dependent pathway may play a role in drug- and radiation-responsiveness in these cells.
Collapse
Affiliation(s)
- S E Morgan
- Division of Molecular Pharmacology, Department of Molecular Genetics, University of Illinois at Chicago, Chicago, Illinois, IL 60607, USA
| | | | | | | | | | | | | |
Collapse
|
37
|
Affiliation(s)
- D A Fennell
- Department of Experimental Haematology, St Bartholomew's and The Royal London School of Medicine, UK
| | | |
Collapse
|
38
|
van de Vaart PJM, Belderbos J, de Jong D, Sneeuw KC, Majoor D, Bartelink H, Begg AC. DNA-adduct levels as a predictor of outcome for NSCLC patients receiving daily cisplatin and radiotherapy. Int J Cancer 2000. [DOI: 10.1002/(sici)1097-0215(20000320)89:2<160::aid-ijc10>3.0.co;2-j] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
39
|
Kannan K, Holcombe RF, Jain SK, Alvarez-Hernandez X, Chervenak R, Wolf RE, Glass J. Evidence for the induction of apoptosis by endosulfan in a human T-cell leukemic line. Mol Cell Biochem 2000; 205:53-66. [PMID: 10821422 DOI: 10.1023/a:1007080910396] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Several organochlorinated pesticides including DDT, PCBs and dieldrin have been reported to cause immune suppression and increase susceptibility to infection in animals. Often this manifestation is accompanied by atrophy of major lymphoid organs. It has been suggested that increased apoptotic cell death leading to altered T-B cell ratios, and loss of regulatory cells in critical numbers leads to perturbations in immune function. The major objective of our study was to define the mechanism by which endosulfan, an organochlorinated pesticide, induces human T-cell death using Jurkat, a human T-cell leukemic cell line, as an in vitro model. We exposed Jurkat cells to varying concentrations of endosulfan for 0-48 h and analyzed biochemical and molecular features characteristic of T-cell apoptosis. Endosulfan lowered cell viability and inhibited cell growth in a dose- and time-dependent manner. DAPI staining was used to enumerate apoptotic cells and we observed that endosulfan at 10-200 microM induced a significant percentage of cells to undergo apoptotic cell death. At 48 h, more than 90% cells were apoptotic with 50 microM of endosulfan. We confirmed these observations using both DNA fragmentation and annexin-V binding assays. It is now widely being accepted that mitochondria undergo major changes early during the apoptotic process. We examined mitochondrial transmembrane potential (deltapsim) in endosulfan treated cells to understand the role of the mitochondria in T-cell apoptosis. Within 30 min of chemical exposure, a significant percentage of cells exhibited a decreased incorporation of DiOC6(3), a cationic lipophilic dye into mitochondria indicating the disruption of deltapsim. This drop in deltapsim was both dose- and time-dependent and correlated well with other parameters of apoptosis. We also examined whether this occurred by the down regulation of bcl-2 protein expression that is likely to increase the susceptibility of Jurkat cells to endosulfan toxicity. Paradoxically, the intracellular expression of bcl-2 protein was elevated in a dose dependent manner suggesting endosulfan-induced apoptosis occurred by a non-bcl-2 pathway. Based on these data, as well as those reported elsewhere, we propose the following sequence of events to account for T-cell apoptosis induced by endosulfan: uncoupling of oxidative phosphorylation --> excess ROS production --> GSH depletion --> oxidative stress --> disruption of deltapsim --> release of cytochrome C and other apoptosis related proteins to cytosol --> apoptosis. This study reports for the first time that endosulfan can induce apoptosis in a human T-cell leukemic cell line which may have direct relevance to loss of T cells and thymocytes in vivo. Furthermore, our data strongly support a role of mitochondrial dysfunction and oxidative stress in endosulfan toxicity.
Collapse
Affiliation(s)
- K Kannan
- Feist-Weiller Cancer Center, Arthritis Center, LSU Health Sciences Center, Shreveport, LA 71130, USA
| | | | | | | | | | | | | |
Collapse
|
40
|
Abstract
Cellular Ca2+ signals are crucial in the control of most physiological processes, cell injury and programmed cell death; mitochondria play a pivotal role in the regulation of such cytosolic Ca2+ ([Ca2+]c) signals. Mitochondria are endowed with multiple Ca2+ transport mechanisms by which they take up and release Ca2+ across their inner membrane. These transport processes function to regulate local and global [Ca2+]c, thereby regulating a number of Ca2+-sensitive cellular mechanisms. The permeability transition pore (PTP) forms the major Ca2+ efflux pathway from mitochondria. In addition, Ca2+ efflux from the mitochondrial matrix occurs by the reversal of the uniporter and through the inner membrane Na+/Ca2+ exchanger. During cellular Ca2+ overload, mitochondria take up [Ca2+]c, which, in turn, induces opening of PTP, disruption of mitochondrial membrane potential (delta(psi)m) and cell death. In apoptosis signaling, collapse of delta(psi)m and cytochrome c release from mitochondria occur followed by activation of caspases, DNA fragmentation, and cell death. Translocation of Bax, an apoptotic signaling protein from the cytosol to the mitochondrial membrane, is another step during this apoptosis-signaling pathway. The role of permeability transition in the context of cell death in relation to Bcl-2 family of proteins is discussed.
Collapse
Affiliation(s)
- S S Smaili
- Laboratory of Cellular and Molecular Neurophysiology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-4495, USA
| | | | | | | |
Collapse
|
41
|
Tuunanen J, Lukasiuk K, Halonen T, Pitkänen A. Status epilepticus-induced neuronal damage in the rat amygdaloid complex: distribution, time-course and mechanisms. Neuroscience 1999; 94:473-95. [PMID: 10579210 DOI: 10.1016/s0306-4522(99)00251-1] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The present study was designed to elucidate the distribution, time-course and mechanism(s) of status epilepticus-induced neuronal damage in the rat amygdaloid complex. Status epilepticus was induced with kainate (9 mg/kg, i.p.), and the behavioral and electrographic seizure activity of each rat was monitored via cortical electrodes attached to a continuous video electrocorticogram system. Rats were subsequently perfused 1, 2, 4, 8, 16, 24 or 48 h after kainate injection. The first signs of amygdaloid damage were seen in rats perfused 4 h after kainate injection, though the severity and temporal appearance of damage varied substantially between the different amygdaloid nuclei and their subdivisions. Second, terminal transferase dUTP nick-end labeling (TUNEL)-positive nuclei and laddering of DNA in gel electrophoresis appeared in the amygdala 8 and 16 h after kainate, respectively. The distribution and density of TUNEL-positive nuclei in the different amygdaloid nuclei correlated with the distribution of neuronal damage in Thionin- and silver-stained sections. Third, the immunoreactivity of Bax protein, a promoter of apoptotic neuronal death, increased in the vulnerable medial division of the lateral nucleus prior to the appearance of argyrophilic neurons and TUNEL-positive nuclei. Fourth, the severity of neuronal damage progressed in some, but not all, amygdaloid regions throughout the 48-h follow-up, even though the occurrence of high-amplitude and frequency discharges, which are typically associated with behavioral seizure activity, extinguished after 7 h. These data show that status epilepticus-induced neuronal damage in the amygdala is a dynamic region-specific process, the severity of which depends on the duration of seizure activity. At least one mechanism underlying the damage involves apoptosis, which continues long after the behavioral and electrographic seizures have subsided.
Collapse
Affiliation(s)
- J Tuunanen
- A. I. Virtanen Institute, University of Kuopio, Finland
| | | | | | | |
Collapse
|
42
|
Xie X, Clausen OP, De Angelis P, Boysen M. The prognostic value of spontaneous apoptosis, Bax, Bcl-2, and p53 in oral squamous cell carcinoma of the tongue. Cancer 1999; 86:913-20. [PMID: 10491515 DOI: 10.1002/(sici)1097-0142(19990915)86:6<913::aid-cncr4>3.0.co;2-a] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Bax, Bcl-2, and p53 proteins are involved in the regulation of apoptosis and have been reported to correlate with prognosis in several tumor types. METHODS Bax, Bcl-2, p53, and the level of spontaneous apoptosis were evaluated in formalin fixed, paraffin embedded pretreatment specimens from 85 T1-4 squamous cell carcinomas (SCCs) of the tongue by immunohistochemical methods. The percentage of apoptotic cells labeled by the terminal deoxynucleotidyl transferase (TdT)-mediated dUTP labeling (TUNEL) method was expressed as an apoptotic index (AI). For Bax and Bcl-2 evaluation, the fraction of tumor cells stained and the staining intensities were given scores that were added together, resulting in a final score. p53 immunostaining was expressed as a percentage of positive cells. RESULTS High AI was significantly associated with high Bax expression (P = 0.0122) and highly differentiated tumors (P = 0.0062). No correlation was found between AI and Bcl-2 expression. There was no correlation between p53 positivity and any of the other apoptosis-related parameters. Whereas low AI scores and low Bax expression correlated significantly with poor prognosis (P = 0.0053 and P = 0.0012, respectively), a low Bcl-2 expression was associated with a favorable clinical outcome (P = 0.0262). Patients with a high Bcl-2/Bax expression ratio had a significantly poorer prognosis than those with a low ratio (P < 0.0001). Multivariate analysis revealed that Bax expression, the Bcl-2/Bax expression ratio, and the T and N classifications were significantly independent prognostic variables. The Bcl-2/Bax expression ratio was the strongest independent prognostic parameter. CONCLUSIONS AI, individual Bax and Bcl-2 expression, and particularly the Bcl-2/Bax expression ratio have prognostic value in SCC of the tongue.
Collapse
Affiliation(s)
- X Xie
- Department of Otolaryngology, The National Hospital, University of Oslo, Oslo, Norway
| | | | | | | |
Collapse
|
43
|
Mori S, Murakami-Mori K, Nakamura S, Ashkenazi A, Bonavida B. Sensitization of AIDS-Kaposi’s Sarcoma Cells to Apo-2 Ligand-Induced Apoptosis by Actinomycin D. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.9.5616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Kaposi’s sarcoma (KS) is the most frequent malignancy associated with HIV infection (AIDS-KS), a complication that leads to high mortality and morbidity. AIDS-KS cells are resistant to killing by chemotherapeutic drugs/NK cells and Fas-induced apoptosis, suggesting that the acquisition of antiapoptotic characteristics by AIDS-KS cells may contribute to their prolonged survival. Apo-2 ligand (Apo-2L)/TNF-related apoptosis-inducing ligand, a new member of the TNF family, has been identified as an apoptosis-inducing molecule. In this study we examined the sensitivity of 10 different AIDS-KS isolates to Apo-2L-mediated cytotoxicity. AIDS-KS cells were relatively resistant to Apo-2L; however, Apo-2L and actinomycin D (Act D) used in combination synergistically potentiated the induction of cell death in nine of the 10 isolates. Apo-2L induced apoptosis in >80% of AIDS-KS cells pretreated with Act D. The caspase inhibitors, zIETD-fmk and zDEVD-fmk, inhibited apoptosis in AIDS-KS by sApo-2L, suggesting that caspase 3-like and caspase 8 or 10 activities are essential for Apo-2L-mediated apoptosis. Act D treatment of AIDS-KS cells markedly and selectively down-regulated Bcl-xL expression, while the expressions of decoy receptors 1 and 2, Bax, cellular FLICE (Fas-associated death domain protein-like IL-1-converting enzyme) inhibitory protein, FADD (Fas-associated death domain protein), procaspase 8, and p53 were not affected. These findings suggest the possible involvement of Bcl-xL in Act D-induced sensitization of AIDS-KS cells to Apo-2L-mediated apoptosis. Furthermore, Act D did not sensitize PBMC or fibroblast cells to Apo-2L. Thus, Apo-2L and Act D used in combination may be of therapeutic value in the treatment of AIDS-KS.
Collapse
Affiliation(s)
- Shunsuke Mori
- *Department of Microbiology and Immunology, University of California School of Medicine, Los Angeles, CA 90095
| | - Kaoru Murakami-Mori
- *Department of Microbiology and Immunology, University of California School of Medicine, Los Angeles, CA 90095
| | | | - Avi Ashkenazi
- ‡Molecular Oncology, Genentech, Inc., South San Francisco, CA 94080
| | - Benjamin Bonavida
- *Department of Microbiology and Immunology, University of California School of Medicine, Los Angeles, CA 90095
| |
Collapse
|
44
|
Evtodienko YV, Teplova VV, Azarashvily TS, Kudin A, Prusakova O, Virtanen I, Saris NE. The Ca2+ threshold for the mitochondrial permeability transition and the content of proteins related to Bcl-2 in rat liver and Zajdela hepatoma mitochondria. Mol Cell Biochem 1999; 194:251-6. [PMID: 10391147 DOI: 10.1023/a:1006913526643] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Zajdela hepatoma mitochondria were able to accumulate two to five times more Ca2+ than rat liver mitochondria before the permeability transition was induced. Pulses of Ca2+ were given in series to determine the Ca2+ threshold by recording changes in [Ca2+] and membrane potential, the permeability transition causing the release of accumulated Ca2+ and collapse of the membrane potential. Hepatoma mitochondria had lower Ca2+ efflux rates, higher net Ca2+ uptake rates and lower phosphorylation rates than liver mitochondria. Since the differences in regard to induction of the permeability transition might be due to higher expression of the Bcl-2 protein in hepatoma cells than in hepatocytes, the transcription of Bcl-2 and the proteins reacting with a Bcl-2 polyclonal antiserum were estimated by Northern and Western blotting, respectively. Hepatoma cells had two Bcl-2 specific mRNA bands of 7 and 2.4 kb, and substantial amounts of the Bcl-2 protein, whereas in liver cells and mitochondria these were not detected. Both cell lines had a reactive band at 19-20 kDa, and hepatocytes a small band at 31-32 kDa. Bcl-2 antibodies stimulated the permeability transition potently in hepatoma mitochondria.
Collapse
Affiliation(s)
- Y V Evtodienko
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino
| | | | | | | | | | | | | |
Collapse
|
45
|
Affiliation(s)
- P H Krammer
- Tumorimmunology Program, German Cancer Research Center, Heidelberg, Germany
| |
Collapse
|
46
|
Maurer CA, Friess H, Bühler SS, Wahl BR, Graber H, Zimmermann A, Büchler MW. Apoptosis inhibiting factor Bcl-xL might be the crucial member of the Bcl-2 gene family in colorectal cancer. Dig Dis Sci 1999. [PMID: 9881495 DOI: 10.1023/a: 1026695025990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
Abstract
Since the role of the Bcl-2 gene family has been only poorly investigated in colorectal cancer, we have examined the expression of the apoptosis blockers Bcl-xL and Bcl-2, as well as the proapoptotic factors Bax and Bak. Northern blot analysis and immunohistochemistry were performed on normal and cancerous colonic tissue from 12 patients. In colorectal cancer, Bcl-xL immunoreaction was stronger than in normal controls, and 83% of the cancers had increased Bcl-xL mRNA expression. The median densitometric Bcl-xL values were 3.4-fold higher in carcinomas (P<0.005). In contrast to the normal colon, colorectal carcinomas often lack any Bcl-2 immunostaining, and Bcl-2 mRNA was not detectable by Northern blots either. Bax was not obviously altered in colorectal cancer, either at the protein level or at the mRNA level compared to the normal control colon. Bak mRNA expression exhibited a wide variation in carcinomas, but was somewhat decreased in comparison to the controls. Of these members of the Bcl-2 gene family, Bcl-xL seems to play a major role in colorectal tumorigenesis and disease progression. An agonistic effect might have caused the tendency for reduced Bak expression. The Bcl-2/Bax regulation system of cell homeostasis seems to be of lesser importance.
Collapse
Affiliation(s)
- C A Maurer
- Clinic of Visceral and Transplantation Surgery, Inselspital, University of Bern, Switzerland
| | | | | | | | | | | | | |
Collapse
|
47
|
Song Q, Kuang Y, Dixit VM, Vincenz C. Boo, a novel negative regulator of cell death, interacts with Apaf-1. EMBO J 1999; 18:167-78. [PMID: 9878060 PMCID: PMC1171112 DOI: 10.1093/emboj/18.1.167] [Citation(s) in RCA: 128] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In this report, we describe the cloning and characterization of Boo, a novel anti-apoptotic member of the Bcl-2 family. The expression of Boo was highly restricted to the ovary and epididymis implicating it in the control of ovarian atresia and sperm maturation. Boo contains the conserved BH1 and BH2 domains, but lacks the BH3 motif. Like Bcl-2, Boo possesses a hydrophobic C-terminus and localizes to intracellular membranes. Boo also has an N-terminal region with strong homology to the BH4 domain found to be important for the function of some anti-apoptotic Bcl-2 homologues. Chromosomal localization analysis assigned Boo to murine chromosome 9 at band d9. Boo inhibits apoptosis, homodimerizes or heterodimerizes with some death-promoting and -suppressing Bcl-2 family members. More importantly, Boo interacts with Apaf-1 and forms a multimeric protein complex with Apaf-1 and caspase-9. Bak and Bik, two pro-apoptotic homologues disrupt the association of Boo and Apaf-1. Furthermore, Boo binds to three distinct regions of Apaf-1. These results demonstrate the evolutionarily conserved nature of the mechanisms of apoptosis. Like Ced-9, the mammalian homologues Boo and Bcl-xL interact with the human counterpart of Ced-4, Apaf-1, and thereby regulate apoptosis.
Collapse
Affiliation(s)
- Q Song
- Department of Pathology, The University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | | | | | | |
Collapse
|
48
|
Frommel TO, Yong S, Zarling EJ. Immunohistochemical evaluation of Bcl-2 gene family expression in liver of hepatitis C and cirrhotic patients: a novel mechanism to explain the high incidence of hepatocarcinoma in cirrhotics. Am J Gastroenterol 1999; 94:178-82. [PMID: 9934751 DOI: 10.1111/j.1572-0241.1999.00792.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The purpose of this study was to determine whether there is an increase in expression of bcl-2 and related bcl-2 gene family members bcl-X and bax in liver biopsy samples obtained from patients with either hepatitis C infection or cirrhosis. Bcl-2, bcl-X, and bax, as well as other bcl-2-related proteins, function coordinately through homo- and heterodimerization to regulate apoptosis. Bcl-2, which is characterized as an antiapoptotic, also functions as an antioxidant. We hypothesized that a mechanism that could account for increased hepatocellular carcinoma in patients with hepatitis C and cirrhosis is selection of bcl-2 expressing cells. This selection would be due to the capacity of individual cells to resist the toxic effects of inflammatory byproducts, specifically reactive oxygen species. METHODS Sections cut from archived liver biopsy samples embedded in paraffin were probed with antibody specific for bcl-2, bcl-X, or bax. Liver samples were from normal (N = 5), hepatitis C patients (N = 19), and cirrhotics (N = 10). Percent positive staining and intensity of staining were judged independently for hepatocytes, bile ducts, mononuclear cells, and Kupffer cells. RESULTS Bcl-2 expression was evident in bile ducts and mononuclear cells of hepatitis C patients, but was not commonly present in hepatocytes (two of 10). In the cirrhotic liver, bcl-2 expression was also detected in bile ducts and mononuclear cells, but in contrast to hepatitis patients was also expressed in hepatocytes (nine of 10). A similar pattern of expression was evident for bcl-X, but in general the level of expression was limited relative to that of bcl-2. Bax expression was infrequently present in sections from any of the three patient groups. CONCLUSIONS The data indicate that bcl-2 expression is elevated in the liver of cirrhotics, but is not evident in the liver of hepatitis C patients. This increase in expression of bcl-2 in cirrhotic patients may correlate with development of hepatocellular carcinoma given the anti-apoptotic/oncogenic potential of bcl-2.
Collapse
Affiliation(s)
- T O Frommel
- Department of Medicine, Loyola University Medical Center, Maywood, Illinois, USA
| | | | | |
Collapse
|
49
|
|
50
|
Verwanger T, Schnitzhofer G, Krammer B. Expression kinetics of the (proto) oncogenes c-myc and bcl-2 following photodynamic treatment of normal and transformed human fibroblasts with 5-aminolaevulinic acid-stimulated endogenous protoporphyrin IX. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 1998; 45:131-5. [PMID: 9868803 DOI: 10.1016/s1011-1344(98)00171-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
In the same way as common tumour therapies can cause secondary tumour induction, photodynamic tumour therapy also shows a moderate mutagenicity. The oncogenes responsible for it can be distinguished from their proto-oncogenic precursors by an irreversible increase in their constitutive expression. Transient changes of the expression level of (proto) oncogenes can indicate the beginning of disturbances in the cell homeostasis: many of these genes have a normal function in proliferation or play a role in apoptosis. In this study, therefore, quantitative determination of the expression of the (proto) oncogenes c-myc and bcl-2 in normal and transformed human fibroblasts at different times following photodynamic treatment with 5-aminolaevulinic acid-stimulated endogenous protoporphyrin IX and low-dose irradiation has been carried out by quantitative reverse transcriptase polymerase chain reaction (RT-PCR). The aim is to investigate if irreversibly increased (proto) oncogene expression can be found, and if expression changes are involved in cell-cycle alterations (detected in a parallel study) and in initiation of apoptotic processes. The results show: (1) no mutagenic risk, since the over-expression of c-myc and bcl-2 is transient; (2) an interaction of bcl-2 and c-myc associated with an increase of the proliferative activity of the cell cycle of transformed cells; (3) a possible role of bcl-2 in counteracting processes that could be at least precursors for apoptosis induction; and (4) higher constitutive expression of both genes in transformed than in normal fibroblasts.
Collapse
Affiliation(s)
- T Verwanger
- Institute of Physics and Biophysics, University of Salzburg, Austria
| | | | | |
Collapse
|