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Kim JH, Kim SE, Song DS, Kim HY, Yoon EL, Kang SH, Jung YK, Kwon JH, Lee SW, Han SK, Chang Y, Jeong SW, Yoo JJ, Jin YJ, Cheon GJ, Kim BS, Seo YS, Kim H, Park JW, Kim TH, Sinn DH, Chung WJ, Kim HY, Lee HA, Nam SW, Kim IH, Kim JH, Chae HB, Sohn JH, Cho JY, Park JG, Cho HC, Kim YJ, Yang JM, Suk KT, Kim MY, Kim SG, Yim HJ, Kim W, Jang JY, Kim DJ. The Clinical Courses and Prognosis of Cirrhotic Patients after First Acute Decompensation: Prospective Cohort Study. Diagnostics (Basel) 2023; 14:14. [PMID: 38201324 PMCID: PMC10795755 DOI: 10.3390/diagnostics14010014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/15/2023] [Accepted: 12/15/2023] [Indexed: 01/12/2024] Open
Abstract
BACKGROUND The European Foundation for the Study of Chronic Liver Failure (EF-CLIF) consortium suggested that the clinical courses after acute decompensation (AD) stratify the long-term prognosis: stable decompensated cirrhosis (SDC), unstable decompensated cirrhosis (UDC), pre acute-on-chronic liver failure (pre ACLF), and ACLF. However, previous studies included patients with a history of previous AD and had limitations associated with identifying the clinical factors related to prognosis after the first AD. METHOD The prospective Korean Acute-on-Chronic Liver Failure (KACLiF) cohort included cirrhotic patients who were hospitalised with first AD between July 2015 and August 2018. We analysed the factors associated with readmission after the first AD and compared the characteristics and prognosis among each subgroup to evaluate the risk factors for the occurrence of pre ACLF after AD. RESULT A total of 746 cirrhotic patients who were hospitalised with first AD were enrolled. The subgroups consisted of SDC (n = 565), UDC (n = 29), pre ACLF (n = 28), and ACLF (n = 124). Of note, pre ACLF showed a poorer prognosis than ACLF. The risk factors associated with readmission within 3 months of first AD were non-variceal gastrointestinal (GI) bleeding, hepatic encephalopathy (HE), and high MELD score. Viral aetiology was associated with the occurrence of pre ACLF compared with alcohol aetiology regardless of baseline liver function status. CONCLUSION Cirrhotic patients with first AD who present as non-variceal GI bleeding and HE can easily relapse. Interestingly, the occurrence of AD with organ failure within 3 months of first AD (pre ACLF) has worse prognosis compared with the occurrence of organ failure at first AD (ACLF). In particular, cirrhotic patients with viral hepatitis with/without alcohol consumption showed poor prognosis compared to other aetiologies. Therefore, patients with ACLF after AD within 3 months should be treated more carefully and definitive treatment through LT should be considered.
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Affiliation(s)
- Jung Hee Kim
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Sung-Eun Kim
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Do Seon Song
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea; (D.S.S.); (H.Y.K.); (J.H.K.); (S.W.L.); (J.M.Y.)
| | - Hee Yeon Kim
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea; (D.S.S.); (H.Y.K.); (J.H.K.); (S.W.L.); (J.M.Y.)
| | - Eileen L. Yoon
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul 04763, Republic of Korea; (E.L.Y.); (J.H.S.)
| | - Seong Hee Kang
- Department of Internal Medicine, Korea University Medical Center, Seoul 02841, Republic of Korea; (S.H.K.); (Y.S.S.); (J.H.K.); (H.J.Y.)
| | - Young-Kul Jung
- Department of Internal Medicine, Korea University Medical Center, Seoul 02841, Republic of Korea; (S.H.K.); (Y.S.S.); (J.H.K.); (H.J.Y.)
| | - Jung Hyun Kwon
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea; (D.S.S.); (H.Y.K.); (J.H.K.); (S.W.L.); (J.M.Y.)
| | - Sung Won Lee
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea; (D.S.S.); (H.Y.K.); (J.H.K.); (S.W.L.); (J.M.Y.)
| | - Seul Ki Han
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju 26426, Republic of Korea; (S.K.H.); (M.Y.K.)
| | - Young Chang
- Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul 04401, Republic of Korea; (Y.C.); (S.W.J.); (J.-Y.J.)
| | - Soung Won Jeong
- Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul 04401, Republic of Korea; (Y.C.); (S.W.J.); (J.-Y.J.)
| | - Jeong Ju Yoo
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon 14584, Republic of Korea; (J.J.Y.); (S.G.K.)
| | - Young-Joo Jin
- Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon 22212, Republic of Korea;
| | - Gab Jin Cheon
- Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung 25440, Republic of Korea;
| | - Byung Seok Kim
- Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu 42472, Republic of Korea;
| | - Yeon Seok Seo
- Department of Internal Medicine, Korea University Medical Center, Seoul 02841, Republic of Korea; (S.H.K.); (Y.S.S.); (J.H.K.); (H.J.Y.)
| | - Hyoungsu Kim
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Ji Won Park
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Tae Hyung Kim
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Dong Hyun Sinn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea;
| | - Woo Jin Chung
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu 42601, Republic of Korea;
| | - Hwi Young Kim
- Department of Internal Medicine, College of Medicine, Ewha Womans University, Seoul 07804, Republic of Korea (H.A.L.)
| | - Han Ah Lee
- Department of Internal Medicine, College of Medicine, Ewha Womans University, Seoul 07804, Republic of Korea (H.A.L.)
| | - Seung Woo Nam
- Department of Internal Medicine, National Medical Center, Seoul 04564, Republic of Korea;
| | - In Hee Kim
- Department of Internal Medicine, Chonbuk National University Hospital, Chonbuk National University Medical School, Jeonju 54896, Republic of Korea;
| | - Ji Hoon Kim
- Department of Internal Medicine, Korea University Medical Center, Seoul 02841, Republic of Korea; (S.H.K.); (Y.S.S.); (J.H.K.); (H.J.Y.)
| | - Hee Bok Chae
- Department of Internal Medicine, Medical Research Institute, Chungbuk National University College of Medicine, Cheongju 28644, Republic of Korea;
| | - Joo Hyun Sohn
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul 04763, Republic of Korea; (E.L.Y.); (J.H.S.)
| | - Ju Yeon Cho
- Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 61452, Republic of Korea;
| | - Jung Gil Park
- Department of Internal Medicine, Yeungnam University College of Medicine, Daegu 42415, Republic of Korea;
| | - Hyun Chin Cho
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju 52727, Republic of Korea;
| | - Yoon Jun Kim
- Department of Internal Medicine, Liver Research Institute, Seoul National University College of Medicine, Seoul 03080, Republic of Korea
| | - Jin Mo Yang
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea; (D.S.S.); (H.Y.K.); (J.H.K.); (S.W.L.); (J.M.Y.)
| | - Ki Tae Suk
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
| | - Moon Young Kim
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju 26426, Republic of Korea; (S.K.H.); (M.Y.K.)
| | - Sang Gyune Kim
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon 14584, Republic of Korea; (J.J.Y.); (S.G.K.)
| | - Hyung Joon Yim
- Department of Internal Medicine, Korea University Medical Center, Seoul 02841, Republic of Korea; (S.H.K.); (Y.S.S.); (J.H.K.); (H.J.Y.)
| | - Won Kim
- Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul 07061, Republic of Korea;
| | - Jae-Young Jang
- Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul 04401, Republic of Korea; (Y.C.); (S.W.J.); (J.-Y.J.)
| | - Dong Joon Kim
- Department of Internal Medicine, Hallym Medical Center, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea; (J.H.K.); (H.K.); (K.T.S.); (D.J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Republic of Korea
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Kim JH, Kim SE, Song DS, Kim HY, Yoon EL, Kim TH, Jung YK, Suk KT, Jun BG, Yim HJ, Kwon JH, Lee SW, Kang SH, Kim MY, Jeong SW, Jang JY, Yoo JJ, Kim SG, Jin YJ, Cheon GJ, Kim BS, Seo YS, Kim HS, Sinn DH, Chung WJ, Kim HY, Lee HA, Nam SW, Kim IH, Suh JI, Kim JH, Chae HB, Sohn JH, Cho JY, Kim YJ, Yang JM, Park JG, Kim W, Cho HC, Kim DJ. Platelet-to-White Blood Cell Ratio Is Associated with Adverse Outcomes in Cirrhotic Patients with Acute Deterioration. J Clin Med 2022; 11:jcm11092463. [PMID: 35566588 PMCID: PMC9103428 DOI: 10.3390/jcm11092463] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 04/23/2022] [Accepted: 04/24/2022] [Indexed: 02/05/2023] Open
Abstract
Background: The platelet-to-white blood cell ratio (PWR) is a hematologic marker of the systemic inflammatory response. Recently, the PWR was revealed to have a role as an independent prognostic factor for mortality in patients with hepatitis B virus (HBV)-related acute-on-chronic failure (ACLF) and HBV-related liver cirrhosis (LC) with acute decompensation (AD). However, the prognostic role of the PWR still needs to be investigated in LC patients with AD. In this study, we analyzed whether the PWR could stratify the risk of adverse outcomes (death or liver transplantation (LT)) in these patients. Methods: A prospective cohort of 1670 patients with AD of liver cirrhosis ((age: 55.2 ± 7.8, male = 1226 (73.4%)) was enrolled and evaluated for 28-day and overall adverse outcomes. Results: During a median follow-up of 8.0 months (range, 1.9−15.5 months), 424 (25.4%) patients had adverse outcomes (death = 377, LT = 47). The most common etiology of LC was alcohol use (69.7%). The adverse outcome rate was higher for patients with a PWR ≤ 12.1 than for those with a PWR > 12.1. A lower PWR level was a prognostic factor for 28-day adverse outcomes (PWR: hazard ratio 1.707, p = 0.034) when adjusted for the etiology of cirrhosis, infection, ACLF, and the MELD score. In the subgroup analysis, the PWR level stratified the risk of 28-day adverse outcomes regardless of the presence of ACLF or the main form of AD but not for those with bacterial infection. Conclusions: A lower PWR level was associated with 28-day adverse outcomes, indicating that the PWR level can be a useful and simple tool for stratifying the risk of 28-day adverse outcomes in LC patients with AD.
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Affiliation(s)
- Jung-Hee Kim
- Department of Internal Medicine, Hallym University College of Medicine, Chuncheon 24252, Korea; (J.-H.K.); (K.-T.S.); (H.-S.K.); (D.-J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Korea
| | - Sung-Eun Kim
- Department of Internal Medicine, Hallym University College of Medicine, Chuncheon 24252, Korea; (J.-H.K.); (K.-T.S.); (H.-S.K.); (D.-J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Korea
- Correspondence: ; Tel.: +82-31-380-3708
| | - Do-Seon Song
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea; (D.-S.S.); (H.-Y.K.); (J.-H.K.); (S.-W.L.); (J.-M.Y.)
| | - Hee-Yeon Kim
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea; (D.-S.S.); (H.-Y.K.); (J.-H.K.); (S.-W.L.); (J.-M.Y.)
| | - Eileen L. Yoon
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul 04763, Korea; (E.L.Y.); (J.-H.S.)
| | - Tae-Hyung Kim
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan 15355, Korea; (T.-H.K.); (Y.-K.J.); (H.-J.Y.); (Y.-S.S.); (J.-H.K.)
| | - Young-Kul Jung
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan 15355, Korea; (T.-H.K.); (Y.-K.J.); (H.-J.Y.); (Y.-S.S.); (J.-H.K.)
| | - Ki-Tae Suk
- Department of Internal Medicine, Hallym University College of Medicine, Chuncheon 24252, Korea; (J.-H.K.); (K.-T.S.); (H.-S.K.); (D.-J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Korea
| | - Baek-Gyu Jun
- Department of Internal Medicine, Inje University Sanggye Paik Hospital, Seoul 01757, Korea; (B.-G.J.); (S.-H.K.)
| | - Hyung-Joon Yim
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan 15355, Korea; (T.-H.K.); (Y.-K.J.); (H.-J.Y.); (Y.-S.S.); (J.-H.K.)
| | - Jung-Hyun Kwon
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea; (D.-S.S.); (H.-Y.K.); (J.-H.K.); (S.-W.L.); (J.-M.Y.)
| | - Sung-Won Lee
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea; (D.-S.S.); (H.-Y.K.); (J.-H.K.); (S.-W.L.); (J.-M.Y.)
| | - Seong-Hee Kang
- Department of Internal Medicine, Inje University Sanggye Paik Hospital, Seoul 01757, Korea; (B.-G.J.); (S.-H.K.)
| | - Moon-Young Kim
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju 26426, Korea;
| | - Soung-Won Jeong
- Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul 04401, Korea; (S.-W.J.); (J.-Y.J.)
| | - Jae-Young Jang
- Department of Internal Medicine, Soonchunhyang University College of Medicine, Seoul 04401, Korea; (S.-W.J.); (J.-Y.J.)
| | - Jeong-Ju Yoo
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon 14584, Korea; (J.-J.Y.); (S.-G.K.)
| | - Sang-Gyune Kim
- Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon 14584, Korea; (J.-J.Y.); (S.-G.K.)
| | - Young-Joo Jin
- Department of Internal Medicine, Inha University Hospital, Inha University School of Medicine, Incheon 22212, Korea;
| | - Gab-Jin Cheon
- Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung 25440, Korea;
| | - Byung-Seok Kim
- Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu 42472, Korea;
| | - Yeon-Seok Seo
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan 15355, Korea; (T.-H.K.); (Y.-K.J.); (H.-J.Y.); (Y.-S.S.); (J.-H.K.)
| | - Hyung-Su Kim
- Department of Internal Medicine, Hallym University College of Medicine, Chuncheon 24252, Korea; (J.-H.K.); (K.-T.S.); (H.-S.K.); (D.-J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Korea
| | - Dong-Hyun Sinn
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Korea;
| | - Woo-Jin Chung
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu 42601, Korea;
| | - Hwi-Young Kim
- Department of Internal Medicine, College of Medicine, Ewha Womans University, Seoul 07804, Korea; (H.-Y.K.); (H.-A.L.)
| | - Han-Ah Lee
- Department of Internal Medicine, College of Medicine, Ewha Womans University, Seoul 07804, Korea; (H.-Y.K.); (H.-A.L.)
| | - Seung-Woo Nam
- Department of Internal Medicine, National Medical Center, Seoul 04564, Korea;
| | - In-Hee Kim
- Department of Internal Medicine, Chonbuk National University Hospital, Chonbuk National University Medical School, Jeonju 54896, Korea;
| | - Jung-Il Suh
- Department of Gastroenterology, Dongguk University College of Medicine, Kyongju 38067, Korea;
| | - Ji-Hoon Kim
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan 15355, Korea; (T.-H.K.); (Y.-K.J.); (H.-J.Y.); (Y.-S.S.); (J.-H.K.)
| | - Hee-Bok Chae
- Department of Internal Medicine, Medical Research Institute, Chungbuk National University College of Medicine, Cheongju 28644, Korea;
| | - Joo-Hyun Sohn
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul 04763, Korea; (E.L.Y.); (J.-H.S.)
| | - Ju-Yeon Cho
- Department of Internal Medicine, College of Medicine, Chosun University, Gwangju 61452, Korea;
| | - Yoon-Jun Kim
- Department of Internal Medicine, Liver Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea;
| | - Jin-Mo Yang
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea; (D.-S.S.); (H.-Y.K.); (J.-H.K.); (S.-W.L.); (J.-M.Y.)
| | - Jung-Gil Park
- Department of Internal Medicine, Yeungnam University College of Medicine, Daegu 42415, Korea;
| | - Won Kim
- Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul 07061, Korea;
| | - Hyun-Chin Cho
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju 52727, Korea;
| | - Dong-Joon Kim
- Department of Internal Medicine, Hallym University College of Medicine, Chuncheon 24252, Korea; (J.-H.K.); (K.-T.S.); (H.-S.K.); (D.-J.K.)
- Institute for Liver and Digestive Diseases, Hallym University, Chuncheon 24252, Korea
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Yim HJ, Kim IH, Suh SJ, Jung YK, Kim JH, Seo YS, Yeon JE, Kim CW, Kwon SY, Park SH, Lee MS, Um SH, Byun KS. Switching to tenofovir vs continuing entecavir for hepatitis B virus with partial virologic response to entecavir: a randomized controlled trial. J Viral Hepat 2018; 25:1321-1330. [PMID: 29772084 DOI: 10.1111/jvh.12934] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 04/16/2018] [Indexed: 12/19/2022]
Abstract
Entecavir 0.5 mg (ETV) is widely used among treatment-naïve chronic hepatitis B (CHB) patients. However, 10%-30% of patients show partial virologic response (PVR) to the drug. If the hepatitis B virus (HBV) continues to replicate, the underlying liver disease may progress. Herein, we compared the efficacy of switching to tenofovir disoproxil fumarate (TDF) with that of continuing ETV in CHB patients with PVR to ETV. This was an open-label randomized controlled trial including CHB patients who had been receiving 0.5 mg of ETV for >12 months, but who still had detectable HBV DNA levels of >60 IU/mL without known resistance to ETV. Sixty patients were enrolled and 45 qualified for the study: Twenty-two patients were randomly assigned into the TDF group and 23 into the ETV group. After 12 months of treatment, the virologic response rate (HBV DNA <20 IU/mL) was significantly higher in the TDF group than in the ETV group, as measured using per-protocol analysis (55% vs 20%; P = .022) and intention-to-treat analysis (50% vs 17.4%; P = .020). The reduction in HBV DNA was greater (-1.13 vs -0.67 log10 IU/mL; P = .024), and the mean HBV DNA level was lower (1.54 vs 2.01 log10 IU/mL; P = .011) in the TDF group than in the ETV group. In conclusion, to achieve optimal response in CHB patients with PVR to ETV, switching to TDF would be a better strategy than continuing ETV. Appropriate modification of therapy would further improve the outcome of chronic HBV infection.
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Affiliation(s)
- H J Yim
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan, South Korea
| | - I H Kim
- Department of Internal Medicine, Chonbuk National University Hospital, Jeonju, South Korea
| | - S J Suh
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan, South Korea
| | - Y K Jung
- Department of Internal Medicine, Korea University Ansan Hospital, Ansan, South Korea.,Department of Internal Medicine, Gachon University Gil Hospital, Incheon, South Korea
| | - J H Kim
- Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea
| | - Y S Seo
- Department of Internal Medicine, Korea University Anam Hospital, Seoul, South Korea
| | - J E Yeon
- Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea
| | - C W Kim
- Department of Internal Medicine, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - S Y Kwon
- Department of Internal Medicine, Konkuk University Hospital, Seoul, South Korea
| | - S H Park
- Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, South Korea
| | - M S Lee
- Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, South Korea
| | - S H Um
- Department of Internal Medicine, Korea University Anam Hospital, Seoul, South Korea
| | - K S Byun
- Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea
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Lee HA, Cho EY, Kim TH, Lee Y, Suh SJ, Jung YK, Kim JH, An H, Seo YS, Kim DS, Yim HJ, Yeon JE, Byun KS, Um SH. Risk Factors for Dropout From the Liver Transplant Waiting List of Hepatocellular Carcinoma Patients Under Locoregional Treatment. Transplant Proc 2018; 50:3521-3526. [PMID: 30577230 DOI: 10.1016/j.transproceed.2018.08.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 08/29/2018] [Indexed: 12/23/2022]
Abstract
BACKGROUND In new organ allocation policy, patients with hepatocellular carcinoma (HCC) experience a 6-month delay in being granted Model for End-Stage Liver Disease exception points. However, it may not be fair for patients at risk of early progression of HCC. METHODS All patients who were diagnosed as United Network for Organ Sharing (UNOS) stage 1 or 2 of HCC between January 2004 and December 2012 were included. Patients who received surgical resection or liver transplant (LT) as a primary treatment and who did not receive any treatment for HCC were excluded. Patients with baseline Model for End-Stage Liver Disease score ≥22 were also excluded because they have a higher chance of receiving LT. Patients who developed extrahepatic progression within 1 year were considered as high-risk for early recurrence after LT. RESULTS A total of 586 patients were included. Mean (SD) age was 59.9 (10.3) years and 409 patients (69.8%) were men. The cumulative incidence of estimated dropout was 8.9% at 6 months; size of the maximum nodule (≥3 cm) and nonachievement of complete response were independent factors. Extrahepatic progression developed in 16 patients (2.7%) within 1 year; size of the maximum nodule (4 cm) and alpha-fetoprotein level (>100 ng/mL) were independent predictors. CONCLUSIONS The estimated dropout rate from the waiting list within 6 months was 8.9%. Advantage points might be needed for patients with maximum nodule size ≥3 cm or those with noncomplete response. However, in patients with maximum nodule size ≥4 cm or alpha-fetoprotein level >100 ng/mL, caution is needed.
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Affiliation(s)
- H A Lee
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - E Y Cho
- Department of Biostatistics, Korea University College of Medicine, Seoul, Korea
| | - T H Kim
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - Y Lee
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - S J Suh
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - Y K Jung
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - J H Kim
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - H An
- Department of Biostatistics, Korea University College of Medicine, Seoul, Korea
| | - Y S Seo
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
| | - D-S Kim
- Department of Surgery, Korea University College of Medicine, Seoul, Korea
| | - H J Yim
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
| | - J E Yeon
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - K S Byun
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - S H Um
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
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Hwang MK, Kim IG, Jung YK, Ryu BK. The Study of Optical Properties as Glass Composition of Bi2O3-Based Glass/Phosphor Mixed Paste. J Nanosci Nanotechnol 2015; 15:7657-7663. [PMID: 26726391 DOI: 10.1166/jnn.2015.11199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Recently, White light emitting diodes (WLEDs) have been studied because of many advantages such as lower energy consumption, fast response, high brightness. Glass frit has been interested in LED packages due to their superior properties such as long-term stability and permeability. To maximize the LED light emission characteristic, the glass frit was required a low firing temperature and high refractive index. We selected the bismuth-based glass due to their low melting and high refractive index. This study was investigated characteristics of glass according to the influence of the glass within Bi2O3 content and this glass characteristic change was studied the effects on the optical properties of LED package structure. The properties changes of the glass frit affect the optical property of the mixed paste. With higher contents of Bi203 glass composition, the transmittance and emission intensity of the mixed paste was increased. These results suggest that the difference in refractive index between the phosphor and glass frit is minimized, the loss of light is minimized.
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Gould A, Udalski A, Shin IG, Porritt I, Skowron J, Han C, Yee JC, Kozłowski S, Choi JY, Poleski R, Wyrzykowski Ł, Ulaczyk K, Pietrukowicz P, Mróz P, Szymański MK, Kubiak M, Soszyński I, Pietrzyński G, Gaudi BS, Christie GW, Drummond J, McCormick J, Natusch T, Ngan H, Tan TG, Albrow M, DePoy DL, Hwang KH, Jung YK, Lee CU, Park H, Pogge RW, Abe F, Bennett DP, Bond IA, Botzler CS, Freeman M, Fukui A, Fukunaga D, Itow Y, Koshimoto N, Larsen P, Ling CH, Masuda K, Matsubara Y, Muraki Y, Namba S, Ohnishi K, Philpott L, Rattenbury NJ, Saito T, Sullivan DJ, Sumi T, Suzuki D, Tristram PJ, Tsurumi N, Wada K, Yamai N, Yock PCM, Yonehara A, Shvartzvald Y, Maoz D, Kaspi S, Friedmann M. Exoplanet detection. A terrestrial planet in a ~1-AU orbit around one member of a ~15-AU binary. Science 2014; 345:46-9. [PMID: 24994642 DOI: 10.1126/science.1251527] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Using gravitational microlensing, we detected a cold terrestrial planet orbiting one member of a binary star system. The planet has low mass (twice Earth's) and lies projected at ~0.8 astronomical units (AU) from its host star, about the distance between Earth and the Sun. However, the planet's temperature is much lower, <60 Kelvin, because the host star is only 0.10 to 0.15 solar masses and therefore more than 400 times less luminous than the Sun. The host itself orbits a slightly more massive companion with projected separation of 10 to 15 AU. This detection is consistent with such systems being very common. Straightforward modification of current microlensing search strategies could increase sensitivity to planets in binary systems. With more detections, such binary-star planetary systems could constrain models of planet formation and evolution.
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Affiliation(s)
- A Gould
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
| | - A Udalski
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - I-G Shin
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - I Porritt
- Turitea Observatory, Palmerston North, New Zealand
| | - J Skowron
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - C Han
- Department of Physics, Chungbuk National University, Cheongju 371-763, Republic of Korea.
| | - J C Yee
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
| | - S Kozłowski
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - J-Y Choi
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - R Poleski
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA. Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - Ł Wyrzykowski
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - K Ulaczyk
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - P Pietrukowicz
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - P Mróz
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - M K Szymański
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - M Kubiak
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - I Soszyński
- Warsaw University Observatory, Aleje Ujazdowskie 4, 00-478 Warszawa, Poland
| | - G Pietrzyński
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA. Universidad de Concepción, Departamento de Astronomia, Casilla 160-C, Concepción, Chile
| | - B S Gaudi
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
| | | | - J Drummond
- Possum Observatory, Patutahi, New Zealand
| | - J McCormick
- Farm Cove Observatory, Centre for Backyard Astrophysics, Pakuranga, Auckland, New Zealand
| | - T Natusch
- Possum Observatory, Patutahi, New Zealand. Auckland University of Technology, Auckland, New Zealand
| | - H Ngan
- Possum Observatory, Patutahi, New Zealand
| | - T-G Tan
- Perth Exoplanet Survey Telescope, Perth, Australia
| | - M Albrow
- Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| | - D L DePoy
- Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843-4242, USA
| | - K-H Hwang
- Department of Physics, Chungbuk National University, Cheongju 371-763, Republic of Korea
| | - Y K Jung
- Department of Physics, Chungbuk National University, Cheongju 371-763, Republic of Korea
| | - C-U Lee
- Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
| | - H Park
- Department of Physics, Chungbuk National University, Cheongju 371-763, Republic of Korea
| | - R W Pogge
- Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA
| | - F Abe
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - D P Bennett
- University of Notre Dame, Department of Physics, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670, USA
| | - I A Bond
- Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
| | - C S Botzler
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
| | - M Freeman
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
| | - A Fukui
- Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, Asakuchi, Okayama 719-0232, Japan
| | - D Fukunaga
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - Y Itow
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - N Koshimoto
- Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
| | - P Larsen
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
| | - C H Ling
- Institute of Information and Mathematical Sciences, Massey University, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
| | - K Masuda
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - Y Matsubara
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - Y Muraki
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - S Namba
- Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
| | - K Ohnishi
- Nagano National College of Technology, Nagano 381-8550, Japan
| | - L Philpott
- Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - N J Rattenbury
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
| | - To Saito
- Tokyo Metropolitan College of Aeronautics, Tokyo 116-8523, Japan
| | - D J Sullivan
- School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
| | - T Sumi
- Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
| | - D Suzuki
- Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
| | - P J Tristram
- Mount John University Observatory, Post Office Box 56, Lake Tekapo 8770, New Zealand
| | - N Tsurumi
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601, Japan
| | - K Wada
- Department of Earth and Space Science, Osaka University, Osaka 560-0043, Japan
| | - N Yamai
- Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - P C M Yock
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001, New Zealand
| | - A Yonehara
- Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan
| | - Y Shvartzvald
- School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
| | - D Maoz
- School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
| | - S Kaspi
- School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
| | - M Friedmann
- School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
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Klein OJ, Jung YK, Evans CL. Longitudinal, quantitative monitoring of therapeutic response in 3D in vitro tumor models with OCT for high-content therapeutic screening. Methods 2013; 66:299-311. [PMID: 24013042 DOI: 10.1016/j.ymeth.2013.08.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Revised: 08/10/2013] [Accepted: 08/23/2013] [Indexed: 11/26/2022] Open
Abstract
In vitro three-dimensional models of cancer have the ability to recapitulate many features of tumors found in vivo, including cell-cell and cell-matrix interactions, microenvironments that become hypoxic and acidic, and other barriers to effective therapy. These model tumors can be large, highly complex, heterogeneous, and undergo time-dependent growth and treatment response processes that are difficult to track and quantify using standard imaging tools. Optical coherence tomography is an optical ranging technique that is ideally suited for visualizing, monitoring, and quantifying the growth and treatment response dynamics occurring in these informative model systems. By optimizing both optical coherence tomography and 3D culture systems, it is possible to continuously and non-perturbatively monitor advanced in vitro models without the use of labels over the course of hours and days. In this chapter, we describe approaches and methods for creating and carrying out quantitative therapeutic screens with in vitro 3D cultures using optical coherence tomography to gain insights into therapeutic mechanisms and build more effective treatment regimens.
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Affiliation(s)
- O J Klein
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 40 Blossom St, Boston, MA 02114, USA.
| | - Y K Jung
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 40 Blossom St, Boston, MA 02114, USA.
| | - C L Evans
- Wellman Center for Photomedicine, Harvard Medical School, Massachusetts General Hospital, 40 Blossom St, Boston, MA 02114, USA.
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Kim JH, Yim HJ, Jung ES, Jung YK, Kim JH, Seo YS, Yeon JE, Lee HS, Um SH, Byun KS. Virologic and biochemical responses to clevudine in patients with chronic HBV infection-associated cirrhosis: data at week 48. J Viral Hepat 2011; 18:287-93. [PMID: 20367793 DOI: 10.1111/j.1365-2893.2010.01304.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Clevudine shows high rates of virologic and biochemical responses in patients with chronic hepatitis B. However, the efficacy and safety of clevudine in patients with cirrhosis are unknown. The aims of this study were to evaluate the safety and to assess the virologic and the biochemical responses to clevudine in patients with cirrhosis with chronic hepatitis B virus (HBV) infection. We reviewed data from treatment-naïve patients with chronic hepatitis B with and without cirrhosis who started clevudine between April 2007 and March 2008 (n = 52, hepatitis B without cirrhosis n = 21 and chronic hepatitis B with cirrhosis n = 31) at Korea University Ansan/Guro Hospital. All of the patients were treated for more than 48 weeks. The mean age was older in the patients with cirrhosis. Baseline HBV DNA levels were 6.9 and 7.78 log copies/mL (P = 0.042), and alanine aminotransferase (ALT) levels were 104.9 and 147.4 IU/L (P = 0.204), for those with and without cirrhosis, respectively. Virologic response (HBV DNA <1000 copies/mL) (87.1%vs 71.4%, P = 0.24) and biochemical response (83.9%vs 80.9%, P = 0.99) at week 48 were not significantly different between the two groups. Early virologic response at week 12 was even higher in the patients with cirrhosis (61.3%vs 28.6%, P = 0.026). Neither ALT flare nor newly onset hepatic decompensation was found in the patients with cirrhosis, whereas ALT flare was transiently observed in 14.3% of the chronic hepatitis group. In conclusion, although clevudine may produce a transient elevation of ALT during the early treatment period, such findings were not observed in patients with cirrhosis and the virologic and biochemical responses of the groups were comparable.
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Affiliation(s)
- J H Kim
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
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9
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Jung MY, Kim GB, Jang ES, Jung YK, Park SY, Lee BH. Technical Note: Improved Extraction Method with Hexane for Gas Chromatographic Analysis of Conjugated Linoleic Acids. J Dairy Sci 2006; 89:90-4. [PMID: 16357271 DOI: 10.3168/jds.s0022-0302(06)72072-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Extraction properties of different solvents (chloroform/methanol, hexane/isopropanol, and hexane) were studied for the gas chromatographic analysis of conjugated linoleic acids (CLA) from probiotic bacteria grown in de Man, Rogosa, and Sharpe medium. As compared with chloroform/methanol and hexane/isopropanol, hexane showed comparable extraction efficiency for CLA from unspent de Man, Rogosa, and Sharpe medium, but showed minimal extraction of oleic acid originated from the emulsifier in broth. The extraction efficiency of CLA by hexane was influenced by the broth pH, showing the optimal pH of 7.0. Repeated extraction with hexane increased the yield. Extraction with hexane showed excellent recovery of spiked CLA from the spent broth with up to 97.2% (standard deviation of 1.74%). This represents the highest recovery of CLA from culture broth ever reported. The sample size was also successfully reduced to 0.5 mL to analyze CLA from the broth without impairment of analytical data. This smaller sample size in the 1.5-mL microcentrifuge tube using a small bench-top centrifuge reduced analytical time significantly.
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Affiliation(s)
- M Y Jung
- Department of Food Science and Agricultural Chemistry, McGill University, Ste-Anne de-Bellevue, QC, H9X 3V9, Canada
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10
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Abstract
The cytokine tumor necrosis factor (TNF)alpha induces caspase-dependent cell death in a subset of tumor cells. In this report, we show a novel suppressive effect of calpeptin, a calpain inhibitor, on TNFalpha-induced cell death and accumulation of p53 in L929 mouse fibrosarcoma. Exposure to 10 ng/ml TNFalpha induced cell death in >50% of L929 cells within 12 h and stimulated accumulation of p53 (8-fold). Preincubation of cells with calpeptin blocked both TNFalpha-induced cell death and accumulation of p53 as examined with Western blot. TNFalpha-induced accumulation of p53 was in part contributed by increase of p53 mRNA level (2.2-fold) in a calpeptin-insensitive manner. Interestingly, other calpain inhibitors tested did not show these effects like calpeptin and TNFalpha treatment did not increase apparent calpain activity in L929 cells, suggesting that calpeptin may have another function besides targeting calpain. Expression of dominant negative mutant p53Val(135) reduced the incidence of TNFalpha-mediated cell death. Taken together, our findings suggest that TNFalpha induces calpeptin-dependent, but calpain-independent accumulation of p53 protein as a necessary step leading to death in L929 cells.
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Affiliation(s)
- B J Kim
- Department of Life Science, Kwangju Institute of Science and Technology, 1 Oryong-dong Puk-gu, Kwangju 500-712, Korea
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11
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Choi YH, Kim KB, Kim HH, Hong GS, Kwon YK, Chung CW, Park YM, Shen ZJ, Kim BJ, Lee SY, Jung YK. FLASH coordinates NF-kappa B activity via TRAF2. J Biol Chem 2001; 276:25073-7. [PMID: 11340079 DOI: 10.1074/jbc.m102941200] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FLASH is a protein recently shown to interact with the death effector domain of caspase-8 and is likely to be a component of the death-inducing signaling complex in receptor-mediated apoptosis. Here we show that antisense oligonucleotide-induced inhibition of FLASH expression abolished TNF-alpha-induced activation of NF-kappaB in HEK293 cells, as determined by luciferase reporter gene expression driven by a NF-kappaB responsive promoter. Conversely, overexpression of FLASH dose-dependently activated NF-kappaB, an effect suppressed by dominant negative mutants of TRAF2, NIK, and IKKalpha, and partially by those of TRAF5 and TRAF6. TRAF2 was co-immunoprecipitated with FLASH from the cell extracts of HEK293 cells or HeLa cells stably expressing exogenous FLASH (HeLa/HA-FLASH). Furthermore, serial deletion mapping demonstrated that a domain spanning the residues 856-1191 of FLASH activated NF-kappaB as efficiently as the full-length and could directly bind to TRAF2 in vitro and in the transfected cells. Taken together, these results suggest that FLASH coordinates downstream NF-kappaB activity via a TRAF2-dependent pathway in the TNF-alpha signaling.
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Affiliation(s)
- Y H Choi
- Department of Life Science, Kwangju Institute of Science and Technology, Puk-gu, Kwangju 500-712, Korea
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Choi WS, Lee EH, Chung CW, Jung YK, Jin BK, Kim SU, Oh TH, Saido TC, Oh YJ. Cleavage of Bax is mediated by caspase-dependent or -independent calpain activation in dopaminergic neuronal cells: protective role of Bcl-2. J Neurochem 2001; 77:1531-41. [PMID: 11413236 DOI: 10.1046/j.1471-4159.2001.00368.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Two cysteine protease families, caspase and calpain, are known to participate in cell death. We investigated whether a stress-specific protease activation pathway exists, and to what extent Bcl-2 plays a role in preventing drug-induced protease activity and cell death in a dopaminergic neuronal cell line, MN9D. Staurosporine (STS) induced caspase-dependent apoptosis while a dopaminergic neurotoxin, MPP(+) largely induced caspase-independent necrotic cell death as determined by morphological and biochemical criteria including cytochrome c release and fluorogenic caspase cleavage assay. At the late stage of both STS- and MPP(+)-induced cell death, Bax was cleaved into an 18-kDa fragment. This 18-kDa fragment appeared only in the mitochondria-enriched heavy membrane fraction of STS-treated cells, whereas it was detected exclusively in the cytosolic fraction of MPP(+)-treated cells. This proteolytic cleavage of Bax appeared to be mediated by calpain as determined by incubation with [(35)S]methionine-labelled Bax. Thus, cotreatment of cells with calpain inhibitor blocked both MPP(+)- and STS-induced Bax cleavage. Intriguingly, overexpression of baculovirus-derived inhibiting protein of caspase, p35 or cotreatment of cells with caspase inhibitor blocked STS- but not MPP(+)-induced Bax cleavage. This appears to indicate that calpain activation may be either dependent or independent of caspase activation within the same cells. However, cotreatment with calpain inhibitor rescued cells from MPP(+)-induced but not from STS-induced neuronal cell death. In these paradigms of dopaminergic cell death, overexpression of Bcl-2 prevented both STS- and MPP(+)-induced cell death and its associated cleavage of Bax. Thus, our results suggest that Bcl-2 may play a protective role by primarily blocking drug-induced caspase or calpain activity in dopaminergic neuronal cells.
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Affiliation(s)
- W S Choi
- Department of Biology, Yonsei University College of Science, Seoul, Korea
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Shin S, Sung BJ, Cho YS, Kim HJ, Ha NC, Hwang JI, Chung CW, Jung YK, Oh BH. An anti-apoptotic protein human survivin is a direct inhibitor of caspase-3 and -7. Biochemistry 2001; 12:522-32. [PMID: 11170436 DOI: 10.4161/cc.23407] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Survivin, an apoptosis inhibitor/cell-cycle regulator, is critically required for suppression of apoptosis and ensuring normal cell division in the G2/M phase of the cell cycle. It is highly expressed in a cell cycle-regulated manner and localizes together with caspase-3 on microtubules within centrosomes. Whether survivin is a physiologically relevant caspase inhibitor has been unclear due to the difficulties with obtaining correctly folded survivin and finding the right conditions for inhibition assay. In this study, recombinant, active human survivin was expressed in Escherichia coli and purified to homogeneity. The protein, existing as a homodimer in solution, binds caspase-3 and -7 tightly with dissociation constants of 20.9 and 11.5 nM, respectively, when evaluated by surface plasmon resonance spectroscopy. Consistently, survivin potently inhibits the cleavage of a physiological substrate poly(ADP-ribose) polymerase and an artificial tetrapeptide by caspase-3 and -7 in vitro with apparent inhibition constants of 36.0 and 16.5 nM, respectively. The data suggest that sequestering caspase-3 and -7 in inhibited states on microtubules is at least one mechanism of survivin in the suppression of default apoptosis in the G2/M phase. The localization of survivin on microtubules, which is essential for its function, should increase the protective activity at the action site.
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Affiliation(s)
- S Shin
- National Creative Research Initiative Center for Biomolecular Recognition, Department of Life Science, and Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Korea
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Abstract
Apoptotic cell death and increased production of amyloid b peptide (Ab) are pathological features of Alzheimer's disease (AD), although the exact contribution of apoptosis to the pathogenesis of the disease remains unclear. Here we describe a novel pro-apoptotic function of calsenilin/DREAM/KChIP3. By antisense oligonucleotide-induced inhibition of calsenilin/DREAM/KChIP3 synthesis, apoptosis induced by Fas, Ca2+-ionophore, or thapsigargin is attenuated. Conversely, calsenilin/DREAM/KChIP3 expression induced the morphological and biochemical features of apoptosis, including cell shrinkage, DNA laddering, and caspase activation. Calsenilin/DREAM/KChIP3-induced apoptosis was suppressed by caspase inhibitor Z-VAD and by Bcl-XL, and was potentiated by increasing cytosolic Ca2+, expression of Swedish amyloid precursor protein mutant (APPSW) or presenilin 2 (PS2), but not by a PS2 deletion lacking its C-terminus (PS2/411stop). In addition, calsenilin/DREAM/KChIP3 expression increased Ab42 production in cells expressing APPsw, which was potentiated by PS2, but not by PS2/411stop, which suggests a role for apoptosis-associated Ab42 production of calsenilin/DREAM/KChIP3.
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Affiliation(s)
- D G Jo
- Department of Life Science, Kwangju Institute of Science and Technology, Puk-gu, Kwangju 500-712, Korea
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Abstract
Hypertrophic cranial pachymeningitis (HCP) is a rare inflammatory disease of unknown origin in which recurrence is frequently observed in spite of the initial response to steroid therapy. Three patients, 1 man and 2 women, aged 63, 66, and 67 years, with severe intractable headache were evaluated by brain MRI. All patients were initially given prednisolone (60 mg/day, oral) or dexamethasone (20 mg/day, i.v.), and followed by long-term (at least 1 year) azathioprine therapy. All patients were evaluated by follow-up laboratory tests and brain MRI study, and completed the 2-year follow-up period. Symptoms including headache were initially improved with corticosteroid therapy, but patients became steroid-dependent. Azathioprine administration in these steroid-dependent patients permitted the complete cessation of corticosteroid and led to the clinical and radiological recovery. In conclusion, initial high-dose corticosteroid administration followed by long-term azathioprine therapy may be the ideal treatment of HCP at present.
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Affiliation(s)
- I S Choi
- Department of Neurology, Yonsei University College of Medicine, Seoul, Korea
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16
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Jang HD, Chung YM, Baik JH, Choi YG, Park IS, Jung YK, Lee SY. Caspase-cleaved TRAF1 negatively regulates the antiapoptotic signals of TRAF2 during TNF-induced cell death. Biochem Biophys Res Commun 2001; 281:499-505. [PMID: 11181075 DOI: 10.1006/bbrc.2001.4369] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Tumor necrosis factor (TNF) signaling leads to pleiotropic responses in a wide range of cell types, in part by activating antiapoptotic and proapoptotic pathways. Previous studies have suggested that TNF receptor-associated factor (TRAF) 2 can mediate crucial antiapoptotic signals during TNF stimulation. However, it is unclear how the antiapoptotic signals via TRAF2 in TNF-R1 signaling is regulated. Here we show that TRAF1 is cleaved by caspase-8 into two fragments during apoptosis induced by TNF. Overexpression of the C-terminal cleavage product, TRAF1-c, increased TNF-induced cell death of hybridoma T cells. Importantly, we demonstrate that the cleavage product of TRAF1 coimmunoprecipitates with TRAF2 that is released from the TNF-R1 complex in response to prolonged TNF treatment. These results indicate that caspase-dependent cleavage of TRAF1 generates TRAF1-c fragments that are able to bind TRAF2, and then sequester TRAF2 from the TNF-R1 complex, rendering cells, at least in part, sensitive to TNF.
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Affiliation(s)
- H D Jang
- Division of Molecular Life Science and Center for Cell Signalling Research, Ewha Womans University, Seoul, 120-750, Korea
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Chung CW, Song YH, Kim IK, Yoon WJ, Ryu BR, Jo DG, Woo HN, Kwon YK, Kim HH, Gwag BJ, Mook-Jung IH, Jung YK. Proapoptotic effects of tau cleavage product generated by caspase-3. Neurobiol Dis 2001; 8:162-72. [PMID: 11162250 DOI: 10.1006/nbdi.2000.0335] [Citation(s) in RCA: 165] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Using an in vitro translation assay to screen a human brain cDNA library, we isolated the microtubule-associated protein Tau and determined it to be a caspase-3 substrate whose C-terminal cleavage occurred during neuronal apoptosis. DeltaTau, the 50-kDa cleavage product, was detected by Western blot in apoptotic cortical cells probed with anti-PHF-1 and anti-Tau-5 antibodies, but not anti-T-46 antibody which recognizes the C-terminus. Overexpression of DeltaTau in SK-N-BE2(C) cells significantly increased the incidence of cell death. Staurosporine-induced Tau cleavage was blocked by 20 microM z-Asp-Glu-Val-Asp-chloromethylketone, a caspase-3 inhibitor, and in vitro, Tau was selectively cleaved by caspase-3 or calpain, a calcium-activated protease, but not by caspases-1, -8, or -9. (D421E)-Tau, a mutant in which Asp421 was replaced with a Glu, was resistant to cleavage by caspase-3 and tended to suppress staurosporine-induced cell death more efficiently than did wild-type Tau in both transient and stable expression systems. Finally, the incidence of DeltaTau-induced cell death was augmented by expression of Abeta precursor protein (APP) or Swedish APP mutant. Taken together, these results suggest that the caspase-3 cleavage product of Tau may contribute to the progression of neuronal cell death in Alzheimer's disease.
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Affiliation(s)
- C W Chung
- Department of Life Science, Kwangju Institute of Science and Technology, and Biomedical Brain Research Center, National Institute of Health, Puk-Gu, Kwangju, 500-712, Korea
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18
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Shin S, Sung BJ, Cho YS, Kim HJ, Ha NC, Hwang JI, Chung CW, Jung YK, Oh BH. An anti-apoptotic protein human survivin is a direct inhibitor of caspase-3 and -7. Biochemistry 2001; 40:1117-23. [PMID: 11170436 DOI: 10.1021/bi001603q] [Citation(s) in RCA: 516] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Survivin, an apoptosis inhibitor/cell-cycle regulator, is critically required for suppression of apoptosis and ensuring normal cell division in the G2/M phase of the cell cycle. It is highly expressed in a cell cycle-regulated manner and localizes together with caspase-3 on microtubules within centrosomes. Whether survivin is a physiologically relevant caspase inhibitor has been unclear due to the difficulties with obtaining correctly folded survivin and finding the right conditions for inhibition assay. In this study, recombinant, active human survivin was expressed in Escherichia coli and purified to homogeneity. The protein, existing as a homodimer in solution, binds caspase-3 and -7 tightly with dissociation constants of 20.9 and 11.5 nM, respectively, when evaluated by surface plasmon resonance spectroscopy. Consistently, survivin potently inhibits the cleavage of a physiological substrate poly(ADP-ribose) polymerase and an artificial tetrapeptide by caspase-3 and -7 in vitro with apparent inhibition constants of 36.0 and 16.5 nM, respectively. The data suggest that sequestering caspase-3 and -7 in inhibited states on microtubules is at least one mechanism of survivin in the suppression of default apoptosis in the G2/M phase. The localization of survivin on microtubules, which is essential for its function, should increase the protective activity at the action site.
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Affiliation(s)
- S Shin
- National Creative Research Initiative Center for Biomolecular Recognition, Department of Life Science, and Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Korea
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19
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Kim KW, Chung HH, Chung CW, Kim IK, Miura M, Wang S, Zhu H, Moon KD, Rha GB, Park JH, Jo DG, Woo HN, Song YH, Kim BJ, Yuan J, Jung YK. Inactivation of farnesyltransferase and geranylgeranyltransferase I by caspase-3: cleavage of the common alpha subunit during apoptosis. Oncogene 2001; 20:358-66. [PMID: 11313965 DOI: 10.1038/sj.onc.1204099] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2000] [Revised: 11/09/2000] [Accepted: 11/09/2000] [Indexed: 11/08/2022]
Abstract
Caspase plays an important role in apoptosis. We report here that farnesyltransferase/geranylgeranyltransferase (FTase/GGTase)-alpha, a common subunit of FTase (alpha/beta(FTase)) and GGTase I (alpha/beta(GGTase)), was cleaved by caspase-3 during apoptosis. FTase/GGTase-alpha (49 kDa) was cleaved to 35 kDa (p35) in the Rat-2/H-ras, W4 and Rat-1 cells treated with FTase inhibitor (LB42708), anti-Fas antibody and etoposide, respectively. This cleavage was inhibited by caspase-inhibitors (YVAD-cmk, DEVD-cho). Serial N-terminal deletions and site-directed mutagenesis showed that Asp59 of FTase/GGTase-alpha was cleaved by caspase-3. The common FTase/GGTase-alpha subunit, but not the beta subunits, of the FTase or GGTase I protein complexes purified from baculovirus-infected SF-9 cells was cleaved to be inactivated by purified caspase-3. In contrast, FTase mutant protein complex [(D(59)A)alpha/beta(FTase)] was resistant to caspase-3. Expression of either the cleavage product (60-379) or anti-sense of FTase/GGTase-alpha induced cell death in Rat-2/H-ras cells. Furthermore, expression of (D(59)A)FTase/GGTase-alpha mutant significantly desensitized cells to etoposide-induced death. Taken together, we suggest that cleavage of prenyltransferase by caspase contributes to the progression of apoptosis.
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Affiliation(s)
- K W Kim
- Department of Life Science, Kwangju Institute of Science and Technology, Puk-gu, Kwangju 500-712, Korea
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20
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Bang S, Jeong EJ, Kim IK, Jung YK, Kim KS. Fas- and tumor necrosis factor-mediated apoptosis uses the same binding surface of FADD to trigger signal transduction. A typical model for convergent signal transduction. J Biol Chem 2000; 275:36217-22. [PMID: 10952991 DOI: 10.1074/jbc.m006620200] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
FADD is known to function as a common signaling conduit in Fas- and tumor necrosis factor (TNF)-mediated apoptosis. The convergent death signals from the Fas receptor and TNF receptor 1 are transferred to FADD by death domain interactions triggering the same cellular event, caspase-8 activation. In this work, we investigated whether the same binding surface of FADD is used for both signaling pathways by using FADD death domain mutants. Mutations in helices alpha2 and alpha3 of the FADD death domain, the interacting surface with the Fas death domain, affected TNF-mediated apoptosis to various extents. This indicated that TNF-mediated apoptosis uses the same binding surface of the FADD death domain as Fas-mediated apoptosis. The binding specificity is not the same, however. Some mutations affected the binding affinity of the Fas death domain for the FADD death domain, but did not influence TNF-mediated apoptosis and vice versa. Interestingly, all mutants tested that affected TNF-mediated apoptosis have structural perturbations, implying that the structural integrity, involving helices alpha2 and alpha3 in particular, is critical in TNF-mediated apoptosis. Our results suggest that different signaling molecules use a similar structural interaction to trigger the same cellular event, such as caspase-8 recruitment, which could be typical in convergent signal transduction.
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Affiliation(s)
- S Bang
- Structural Biology Center, Korea Institute of Science and Technology, Seoul 130-650, Korea
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21
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Abstract
TRAIL induces apoptosis in various tumor cells. We report here that caspase-8 is required in TRAIL-induced cell death. Western blot analyses and enzyme assays showed that exposing Jurkat cells to TRAIL resulted in activation of caspases-8 followed by caspase-3 and -9. Acetyl-IETD-fluoromethylketone, a caspase-8 inhibitor, potently suppressed TRAIL-induced cell death compared to acetyl-DEVD-fluoromethylketone and acetyl-LEHD-fluoromethylketone, inhibitors of caspase-3 and caspase-9, respectively. JB6 cells, a caspase-8-deficient Jurkat variant, were completely resistant to TRAIL. However, reconstitution with a caspase-8, but not with caspase-2 or -3, sensitized JB6 cells to subsequent exposure to TRAIL. These results are indicative of the crucial function of caspase-8 in TRAIL-induced apoptosis in Jurkat cells.
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Affiliation(s)
- I K Kim
- Department of Life Science, Kwangju Institute of Science and Technology, 1 Oryong Puk-Gu, Kwangju, 500-712, Korea
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22
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Kim H, Jung YK, Jo DG, Park SH. Assignment of the rat calcineurin inhibitor gene (Cain) to rat chromosome band 20p12 by fluorescence in situ hybridization. Cytogenet Cell Genet 2000; 89:236-7. [PMID: 10965132 DOI: 10.1159/000015622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- H Kim
- Institute of Human Genetics, Department of Anatomy, Korea University College of Medicine, Seoul, South Korea
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23
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Abstract
Clathrin-coated vesicles (CCVs) are involved in protein and lipid trafficking between intracellular compartments in eukaryotic cells. CCVs are composed of clathrin and assembly proteins. The clathrin assembly protein lymphoid myeloid leukemia (CALM) gene, encodes a homologoue of the neuronal clathrin assembly protein AP180. In this study, we characterized the properties of the CALM expressed in E. coli. The molecular weight of bacterially expressed GST-CALM fusion protein was approximately 105 kD on SDS-PAGE. The CALM protein could promote clathrin triskelia into clathrin cages and could bind the preformed clathrin cage. However, 33 kD N-terminal domain of CALM could not bind pre-assembled clathrin cages, but assemble clathrin triskelia into clathrin cages. The CALM protein was bound to SH3 domain through N-terminal domain1, in vitro. The CALM protein is proteolyzed by caspase 3, caspase 8 and calpain through C-terminal domain.
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Affiliation(s)
- J A Kim
- Department of Biochemistry, Medical College, Ewha Womans University, Seoul, Korea
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24
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Ko HW, Han KS, Kim EY, Ryu BR, Yoon WJ, Jung YK, Kim SU, Gwag BJ. Synergetic activation of p38 mitogen-activated protein kinase and caspase-3-like proteases for execution of calyculin A-induced apoptosis but not N-methyl-d-aspartate-induced necrosis in mouse cortical neurons. J Neurochem 2000; 74:2455-61. [PMID: 10820206 DOI: 10.1046/j.1471-4159.2000.0742455.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We examined the possibility that p38 mitogen-activated protein kinase and caspase-3 would be activated for execution of apoptosis and excitotoxicity, the two major types of neuronal death underlying hypoxicischemic and neurodegenerative diseases. Mouse cortical cell cultures underwent widespread neuronal apoptosis 24 h following exposure to 10-30 nM calyculin A, a selective inhibitor of Ser/Thr phosphatase I and IIA. Activity of p38 was increased 2-4 h following exposure to 30 nM calyculin A. Addition of 3-10 microM PD169316, a selective p38 inhibitor, partially attenuated calyculin A neurotoxicity. Activity of caspase-3-like proteases was increased in cortical cell cultures exposed to 30 nM calyculin A for 8-16 h as shown by cleavage of DEVD-p-nitroanilide and phosphorylated tau. Proteolysis of tau was completely blocked by addition of 100 microM N-benzyloxycarbonyl-Val-Ala-Asp-fluoromethyl ketone (z-VAD-fmk), a broad-spectrum inhibitor of caspases, but incompletely by 10 microM PD169316. Calyculin A neurotoxicity was partially sensitive to 100 microM z-VAD-fmk. Cotreatment with 10 microM PD169316 and 100 microM z-VAD-fmk showed additive neuroprotection against calyculin A. Neither PD169316 nor z-VAD-fmk showed a beneficial effect against excitotoxic neuronal necrosis induced by exposure to 20 microM NMDA. Thus, caspase-3-like proteases and p38 likely contribute to calyculin A-induced neuronal apoptosis but not NMDA-induced neuronal necrosis.
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Affiliation(s)
- H W Ko
- Department of Pharmacology Ajou University School of Medicine, Suwon, Kyungkido, Korea
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25
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Kim H, Jung YK, Kwon YK, Park SH. Assignment of apoptotic protease activating factor-1 gene (APAF1) to human chromosome band 12q23 by fluorescence in situ hybridization. Cytogenet Cell Genet 2000; 87:252-3. [PMID: 10702682 DOI: 10.1159/000015436] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- H Kim
- Institute of Human Genetics, Department of Anatomy, Korea University College of Medicine, Korea University, Seoul, Korea
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26
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Abstract
Apoptosis is a process of active cell death and is characterized by activation of caspases, DNA fragmentation, and biochemical and morphological changes. To better understand apoptosis, we have characterized the dose- and time-dependent toxic effects of cadmium in Rat-1 fibroblasts. Staining of cells with phosphatidylserine (PS)-annexin V, Hoechst 33258 or Rhodamine 123 and Tunel assays showed that incubating cells with 10 microM cadmium induced a form of cell death exhibiting typical characteristics of apoptosis, including cell shrinkage, externalization of PS, loss of mitochondria membrane potential, nuclear condensation and DNA fragmentation. Expression of Bcl-2 or CrmA each suppressed cadmium-induced cell death although Bcl-2 was somewhat more effective than CrmA. In vitro assay of caspase activity carried out using poly(ADP-ribose) polymerase (PARP) as a substrate as well as intracellular caspase assays using a fluorigenic caspase-3 substrate confirmed that caspase-3 is activated in Rat-1 cells undergoing cadmium-induced apoptosis. Both Asp-Glu-Val-Asp-aldehyde (DEVD-cho) and Tyr-Val-Ala-Asp-chloromethylketone (YVAD-cmk), selective inhibitors of caspase-3 and caspase-1, respectively, suppressed significantly cadmium-induced cell death. However, the nonselective caspase inhibitor, z-Val-Ala-Asp-floromethylketone (zVAD-fmk), was the most efficacious agent, almost completely blocking cadmium-induced cell death. Taken together, these results demonstrate that as in other forms of apoptosis, caspases play a central role in cadmium-induced cell death.
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Affiliation(s)
- M S Kim
- Department of Life Science, Kwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Kwangju, South Korea
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27
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Park HS, Huh SH, Kim Y, Shim J, Lee SH, Park IS, Jung YK, Kim IY, Choi EJ. Selenite negatively regulates caspase-3 through a redox mechanism. J Biol Chem 2000; 275:8487-91. [PMID: 10722685 DOI: 10.1074/jbc.275.12.8487] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Selenium, an essential biological trace element, exerts its modulatory effects in a variety of cellular events including cell survival and death. In our study we observed that selenite protects HEK293 cells from cell death induced by ultraviolet B radiation (UVB). Exposure of HEK293 cells to UVB radiation resulted in the activation of caspase-3-like protease activity, and pretreatment of the cells with z-DEVD-fmk (N-benzyloxycarbonyl-Asp-Glu-Val-Asp-fluoromethylketone), a caspase-3 inhibitor, prevented UVB-induced cell death. Interestingly, enzymatic activity of caspase-3-like protease in cell lysates of UVB-exposed cells was repressed in vitro by the presence of selenite. Selenite also inhibited the in vitro activity of purified recombinant caspase-3 in cleaving Ac-DEVD-pNA (N-acetyl-Asp-Glu-Asp-p-nitroanilide) or ICAD(L) (inhibitor of a caspase-activated deoxyribonuclease) and in the induction of DNA fragmentation. The inhibitory action of selenite on a recombinant active caspase-3 could be reversed by sulfhydryl reducing agents, such as dithiothreitol and beta-mercaptoethanol. Furthermore, pretreatment of cells with selenite suppressed the stimulation of the caspase-3-like protease activity in UVB-exposed cells, whereas dithiothreitol and beta-mercaptoethanol reversed this suppression of the enzymatic activity. Taken together, our data suggest that selenite inhibits caspase-3-like protease activity through a redox mechanism and that inhibition of caspase-3-like protease activity may be the mechanism by which selenite exerts its protective effect against UVB-induced cell death.
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Affiliation(s)
- H S Park
- National Creative Research Initiative Center for Cell Death, Korea University, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea
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28
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Abstract
Nocodazole, a microtubule-disrupting agent, induced apoptosis in Rat-1 cells, as indicated by changes in cell morphology, DNA fragmentation, and eventual cell death. During nocodazole-induced apoptosis, normally flat cells became rounded in shape and detached from the extracellular matrix. These morphological changes appeared to be closely associated with degradation of focal adhesion proteins, including p130cas, p125(FAK) and paxillin. p130cas was also degraded in cells treated with staurosporine or etoposide, suggesting that degradation of focal adhesion proteins is a characteristic feature of apoptosis. Nocodazole-induced apoptosis was antagonized by Bcl-2: degradation of focal adhesion proteins was suppressed and cell viability was enhanced in bcl-2 over-expressing cells, even in the presence of nocodazole. Further study of the molecular mechanism of Bcl-2 activation should provide an understanding of the apoptosis induced by disruption of the microtubule network.
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Affiliation(s)
- S Kook
- Department of Life Science and Energy & Environmental Research Center, Kwangju Institute of Science & Technology, Kwangju 500-712, Korea
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29
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Kook S, Shim SR, Choi SJ, Ahnn J, Kim JI, Eom SH, Jung YK, Paik SG, Song WK. Caspase-mediated cleavage of p130cas in etoposide-induced apoptotic Rat-1 cells. Mol Biol Cell 2000; 11:929-39. [PMID: 10712510 PMCID: PMC14821 DOI: 10.1091/mbc.11.3.929] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Apoptosis causes characteristic morphological changes in cells, including membrane blebbing, cell detachment from the extracellular matrix, and loss of cell-cell contacts. We investigated the changes in focal adhesion proteins during etoposide-induced apoptosis in Rat-1 cells and found that during apoptosis, p130cas (Crk-associated substrate [Cas]) is cleaved by caspase-3. Sequence analysis showed that Cas contains 10 DXXD consensus sites preferred by caspase-3. We identified two of these sites (DVPD(416)G and DSPD(748)G) in vitro, and point mutations substituting the Asp of DVPD(416)G and DSPD(748)G with Glu blocked caspase-3-mediated cleavage. Cleavage at DVPD(416)G generated a 74-kDa fragment, which was in turn cleaved at DSPD(748)G, yielding 47- and 31-kDa fragments. Immunofluorescence microscopy revealed well-developed focal adhesion sites in control cells that dramatically declined in number in etoposide-treated cells. Cas cleavage correlated temporally with the onset of apoptosis and coincided with the loss of p125FAK (focal adhesion kinase [FAK]) from focal adhesion sites and the attenuation of Cas-paxillin interactions. Considering that Cas associates with FAK, paxillin, and other molecules involved in the integrin signaling pathway, these results suggest that caspase-mediated cleavage of Cas contributes to the disassembly of focal adhesion complexes and interrupts survival signals from the extracellular matrix.
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Affiliation(s)
- S Kook
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju 500-712, Korea
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30
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Lee SK, Anzick SL, Choi JE, Bubendorf L, Guan XY, Jung YK, Kallioniemi OP, Kononen J, Trent JM, Azorsa D, Jhun BH, Cheong JH, Lee YC, Meltzer PS, Lee JW. A nuclear factor, ASC-2, as a cancer-amplified transcriptional coactivator essential for ligand-dependent transactivation by nuclear receptors in vivo. J Biol Chem 1999; 274:34283-93. [PMID: 10567404 DOI: 10.1074/jbc.274.48.34283] [Citation(s) in RCA: 164] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Many transcription coactivators interact with nuclear receptors in a ligand- and C-terminal transactivation function (AF2)-dependent manner. We isolated a nuclear factor (designated ASC-2) with such properties by using the ligand-binding domain of retinoid X receptor as a bait in a yeast two-hybrid screening. ASC-2 also interacted with other nuclear receptors, including retinoic acid receptor, thyroid hormone receptor, estrogen receptor alpha, and glucocorticoid receptor, basal factors TFIIA and TBP, and transcription integrators CBP/p300 and SRC-1. In transient cotransfections, ASC-2, either alone or in conjunction with CBP/p300 and SRC-1, stimulated ligand-dependent transactivation by wild type nuclear receptors but not mutant receptors lacking the AF2 domain. Consistent with an idea that ASC-2 is essential for the nuclear receptor function in vivo, microinjection of anti-ASC-2 antibody abrogated the ligand-dependent transactivation of retinoic acid receptor, and this repression was fully relieved by coinjection of ASC-2-expression vector. Surprisingly, ASC-2 was identical to a gene previously identified during a search for genes amplified and overexpressed in breast and other human cancers. From these results, we concluded that ASC-2 is a bona fide transcription coactivator molecule of nuclear receptors, and its altered expression may contribute to the development of cancers.
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Affiliation(s)
- S K Lee
- Center for Ligand and Transcription, Chonnam National University, Kwangju 500-757, Korea
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31
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Abstract
We report here the inactivation of a member of the Ice/Ced-3 (caspase) family of cell death genes, casp-11, by gene targeting. Like Ice-deficient mice, casp-11 mutant mice are resistant to endotoxic shock induced by lipopolysaccharide. Production of both IL-1alpha and IL-1beta after lipopolysaccharide stimulation, a crucial event during septic shock and an indication of ICE activation, is blocked in casp-11 mutant mice. casp-11 mutant embryonic fibroblast cells are resistant to apoptosis induced by overexpression of ICE. Furthermore, we found that pro-caspase-11 physically interacts with pro-ICE in cells, and the expression of casp-11 is essential for activation of ICE. Our data suggest that caspase-11 is a component of ICE complex and is required for the activation of ICE.
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Affiliation(s)
- S Wang
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
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32
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Kim TW, Pettingell WH, Jung YK, Kovacs DM, Tanzi RE. Alternative cleavage of Alzheimer-associated presenilins during apoptosis by a caspase-3 family protease. Science 1997; 277:373-6. [PMID: 9219695 DOI: 10.1126/science.277.5324.373] [Citation(s) in RCA: 276] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Most cases of early-onset familial Alzheimer's disease (FAD) are caused by mutations in the genes encoding the presenilin 1 (PS1) and PS2 proteins, both of which undergo regulated endoproteolytic processing. During apoptosis, PS1 and PS2 were shown to be cleaved at sites distal to their normal cleavage sites by a caspase-3 family protease. In cells expressing PS2 containing the asparagine-141 FAD mutant, the ratio of alternative to normal PS2 cleavage fragments was increased relative to wild-type PS2-expressing cells, suggesting a potential role for apoptosis-associated cleavage of presenilins in the pathogenesis of Alzheimer's disease.
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Affiliation(s)
- T W Kim
- Genetics and Aging Unit, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA
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33
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Abstract
The Interleukin-1beta converting enzyme (ICE) family of proteins, homologs of the C elegans cell death gene product CED-3, play important roles in controlling vertebrate programmed cell death. Because inhibition of apoptosis may be an essential step in tumorigenesis, we investigated the interaction of the simian virus 40 large T antigen (T ag) with the ICE family. COS-1 cells which were transformed by the simian virus 40 do not die when transfected with expression constructs of Ice or Ich-1(L). We found that expression of T ag alone significantly prevents the ICE-induced apoptosis. p53, but not pRb or p107, antagonizes the effect of T ag on the suppression of ICE-induced cell death, but not on ICH-1(L)-mediated cell death. Thus, wild type p53 may potentiate ICE-induced apoptosis. Expression of a temperature sensitive mutant p53Val(135) sensitizes COS-1 cells to apoptosis induced by ICE at permissive but not at non-permissive temperature. While induction of bax, p21(WAF1/CIP), or cyclin D1 gene expression is observed in the COS-1 p53Val(135) cells at the permissive temperature, overexpression of bax, but not p21(WAF1/CIP) or cyclin D1, potentiates ICE-induced COS-1 cell death. Taken together, these results suggest that T ag may modulate the cells' susceptibility to death by suppressing activity of the ICE family through inhibiting p53.
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Affiliation(s)
- Y K Jung
- Cardiovascular Research Center, Massachusetts General Hospital-East, Charlestown 02129, USA
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34
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Abstract
Several of the genes for enzymes involved in peptide hormone processing, such as carboxypeptidase E (CPE), do not contain a TATA box. The region surrounding the major transcription initiation site of the CPE gene has sequence homology with the 'initiator' (Inr) elements of the TATA-less terminal deoxynucleotidyltransferase (TdT) gene, and the adenovirus major late (AdML) and other promoters. To investigate the promoter region of the CPE gene, GH4C1 cells were transiently transfected with constructs containing the luciferase reporter gene attached to various portions of the rat CPE gene (-395 to +45). Positive regulator elements were detected in positions -84 to -12 and +30 to +47. However, the Inr-like element of the CPE gene (-12 to +20) produced detectable luciferase activity in the absence of upstream and downstream sequences. This region of the CPE gene was much more active when expressed in the normal (sense) orientation than when expressed in the antisense orientation. A mutation within the consensus sequence between CPE and other Inr elements was much less active than the wild-type sequence. Interestingly, deletion of the Inr and surrounding sequences produced a large increase in the transcription from upstream sites, suggesting that proteins which bind at, or near, the Inr sequence suppress transcription from other sites. To characterize GH4C1 nuclear proteins which bind to the CPE gene, Southwestern blotting, UV cross-linking, and gel shift analyses were performed. The Southwestern analysis showed that the CPE and AdML Inr sequences labeled several proteins of similar sizes which are distinct from the transcription factor USF; this factor has been previously reported to bind to the AdML Inr sequence. A CPE Inr-binding protein co-purifies with an AdML Inr-binding protein on a CPE Inr affinity column. Gel shift assays showed that with some binding conditions, the proteins that bind to the CPE sequence also bind to the TdT and AdML Inr elements. Taken together, these results indicate that the -12 to +20 region of the CPE gene has the properties of an Inr element which binds some, but not all, of the factors which bind to other Inr elements.
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Affiliation(s)
- Y K Jung
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461
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35
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Jung YK, Kunczt CJ, Pearson RK, Fricker LD, Dixon JE. Expression of the rat carboxypeptidase-E gene in neuroendocrine and nonneuroendocrine cell lines. Mol Endocrinol 1992; 6:2027-37. [PMID: 1491689 DOI: 10.1210/mend.6.12.1491689] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
To identify cis-acting elements involved with the expression of the rat carboxypeptidase-E (CPE) gene, constructs containing various regions of the 5'-flanking region of the CPE gene attached to the luciferase reporter gene were transiently expressed in cell lines derived from pituitary (AtT-20 and GH4C1), liver (SK-HEP-1), and kidney (HEK293 and COS1). Regions of the CPE gene spanning the major transcription initiation site (-12 to 47) are sufficient for low levels of transcription. Activity is enhanced 3- to 15-fold by sequences present between -12 and -395 in all cell lines examined. Sequences between -395 and -3081 influenced transcription activity up to 5-fold in some, but not all, cell lines. There was no correlation between the transcription activities of the various constructs and the level of endogenous CPE mRNA in the cell lines, indicating that the tissue-specific elements responsible for the large variations in endogenous CPE mRNA levels are not present within -3081 to 47. The region between -395 and 45 was examined in greater detail using transient expression assays and DNase-I protection analysis. Transcription activity is enhanced in GH4C1 and HEK293 cells by sequence present between -12 and -84; this region contains a potential GC box, which binds factors present in GH4C1 nuclear extracts. Other regions between -340 and 80 that bind proteins in the GH4C1 nuclear extracts include the major transcription initiation site, which has homology to the initiator sequence; the pituitary-specific transcription initiation sites (-101 and -105); and sequences with homology to NF-1, Pan-1, simian virus-40 enhancer core, and AP-2-binding sites. Taken together, these results suggest that basal expression of the CPE gene from its major transcription initiation site, which does not contain an up-stream TATA box, is primarily under the control of an initiator-like element together with an upstream GC box.
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Affiliation(s)
- Y K Jung
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461
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Abstract
Several genomic clones encoding carboxypeptidase-E (CPE) have been isolated and partially sequenced. Southern blot analysis indicates that a single copy of this gene is present in the rat genome. The entire gene spans approximately 50 kilobases and consists of nine exons, each of which contains protein-coding regions. Only one of the exon/intron junctions of the rat CPE gene is present in a comparable position within the genes for carboxypeptidase-A and -B, both of which are only 17-21% homologous to CPE at the amino acid level. Nuclease protection analysis shows that alternative splicing of exons 7, 8, and 9 does not occur, indicating that the heterogeneity of the C-terminal region of CPE is due to posttranslational processing. Primer extension and nuclease protection analyses have identified the 5' end of CPE mRNA to be 105 nucleotides up-stream from the ATG used for protein translation. The 5' flanking region does not contain TATA and/or CCAAT boxes in the near vicinity of the transcription initiation site. The 5' flanking region is GC rich, containing 70% GC residues over nucleotides -1 to -150 (relative to the transcription initiation site). Putative consensus sites for the enhancer elements SP-1, NF-1, Pan-1, and AP-2 are present in the region from -60 to -330. Since this report describes the first neuropeptide-processing enzyme gene to be partially sequenced, it is not possible to compare the sequence with those of other processing enzymes that show similar tissue-specific expression. However, comparison of the CPE sequence with 5' flanking regions of other neuroendocrine genes has revealed a short region (12-18 nucleotides) that is highly conserved among CPE, neuropeptide-Y, oxytocin, insulin, and tyrosine hydroxylase genes.
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Affiliation(s)
- Y K Jung
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York 10461
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