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Rosli R, Zakaria N, Baharuddin M, Rahman SA. Seismic Polarity-Based Sequences to Enhance Seismic Imaging of Carbonate Depositional Environments via the Application of Attributes. Asia Petroleum Geoscience Conference and Exhibition (APGCE) 2022. [DOI: 10.3997/2214-4609.202270158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Affiliation(s)
- R. Rosli
- Eliis Sdn Bhd
- Southeast Asia Carbonate Research Laboratory (SEACARL), Universiti Teknologi PETRONAS
| | - N.A. Zakaria
- Centre for Subsurface Imaging (CSI), Universiti Teknologi PETRONAS
| | | | - S.S. Abd Rahman
- Digital Geoscience Global Sdn Bhd (DGeG)
- Southeast Asia Carbonate Research Laboratory (SEACARL), Universiti Teknologi PETRONAS
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2
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Tay K, Shunmugarajoo A, Azmel A, Ang E, Rosli R, Goh E, Subramaniam N. Human brucellosis outbreaks in Klang district, Malaysia. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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3
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Shunmugarajoo A, Mustakim S, Sfkhan S, Azmel A, Rosli R, Govindasamy T, Chellapan K, Mokhtar A, Noor NM, Rmnn N, Ang E. Outbreak of Bacillus bacteremia from contaminated hospital linens. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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4
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Mohd Thabit A, Azmel A, Shunmugarajoo A, Rosli R, Mustakim S, Lee S. Retrospective analysis of dengue mortalities over a 32 month period in a state hospital, Malaysia. Int J Infect Dis 2020. [DOI: 10.1016/j.ijid.2020.09.1350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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5
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Rosli R, Loh DA, Choo WY, MohdHairi F, Peramalah D, Kandiben S, Lee PL, Gani N, Madzlan MF, Abd Hamid MAI, Akram Z, Chu AS, Bulgiba A, Cumming RG, Tan MP, Chin AV, Hairi NN. 26EFFECTS OF MULTICOMPONENT EXERCISE AND THERAPEUTICLIFESTYLE (CERGAS) INTERVENTION ON COGNITIVE FUNCTION IN LOWER INCOME ELDERLY POPULATION: A CLUSTER RANDOMISED CONTROLLED TRIAL. Age Ageing 2017. [DOI: 10.1093/ageing/afx118.26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Tan BS, Tiong KH, Choo HL, Chung FFL, Hii LW, Tan SH, Yap IKS, Pani S, Khor NTW, Wong SF, Rosli R, Cheong SK, Leong CO. Mutant p53-R273H mediates cancer cell survival and anoikis resistance through AKT-dependent suppression of BCL2-modifying factor (BMF). Cell Death Dis 2015; 6:e1826. [PMID: 26181206 PMCID: PMC4650736 DOI: 10.1038/cddis.2015.191] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/25/2015] [Accepted: 06/09/2015] [Indexed: 12/31/2022]
Abstract
p53 is the most frequently mutated tumor-suppressor gene in human cancers. Unlike other tumor-suppressor genes, p53 mutations mainly occur as missense mutations within the DNA-binding domain, leading to the expression of full-length mutant p53 protein. Mutant p53 proteins not only lose their tumor-suppressor function, but may also gain new oncogenic functions and promote tumorigenesis. Here, we showed that silencing of endogenous p53-R273H contact mutant, but not p53-R175H conformational mutant, reduced AKT phosphorylation, induced BCL2-modifying factor (BMF) expression, sensitized BIM dissociation from BCL-XL and induced mitochondria-dependent apoptosis in cancer cells. Importantly, cancer cells harboring endogenous p53-R273H mutant were also found to be inherently resistant to anoikis and lack BMF induction following culture in suspension. Underlying these activities is the ability of p53-R273H mutant to suppress BMF expression that is dependent on constitutively active PI3K/AKT signaling. Collectively, these findings suggest that p53-R273H can specifically drive AKT signaling and suppress BMF expression, resulting in enhanced cell survivability and anoikis resistance. These findings open the possibility that blocking of PI3K/AKT will have therapeutic benefit in mutant p53-R273H expressing cancers.
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Affiliation(s)
- B S Tan
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - K H Tiong
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Oral Cancer Research and Co-ordinating Center (OCRCC), Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia [3] Cancer Research Initiatives Foundation, Sime Darby Medical Centre, Subang Jaya, Malaysia
| | - H L Choo
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - F Fei-Lei Chung
- Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - L-W Hii
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - S H Tan
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - I K S Yap
- School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - S Pani
- ANU Medical School, Canberra Hospital Campus, The Canberra Hospital Building 4, Garran, Australia
| | - N T W Khor
- School of Medicine, Faculty of Medical and Health Sciences, The University of Auckland, Auckland, New Zealand
| | - S F Wong
- School of Medicine, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
| | - R Rosli
- UPM-MAKNA Cancer Research Laboratory, Institute of Bioscience, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - S-K Cheong
- Faculty of Medicine and Health Sciences, University Tunku Abdul Rahman, Bandar Sungai Long, Selangor, Malaysia
| | - C-O Leong
- 1] School of Postgraduate Studies, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [2] Center for Cancer and Stem Cell Research, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia [3] School of Pharmacy, International Medical University, Bukit Jalil, Kuala Lumpur, Malaysia
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Haghshenas B, Abdullah N, Nami Y, Radiah D, Rosli R, Yari Khosroushahi A. Microencapsulation of probiotic bacteria Lactobacillus plantarum
15HN using alginate-psyllium-fenugreek polymeric blends. J Appl Microbiol 2015; 118:1048-57. [DOI: 10.1111/jam.12762] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 11/27/2014] [Accepted: 01/15/2015] [Indexed: 11/27/2022]
Affiliation(s)
- B. Haghshenas
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - N. Abdullah
- Chemical and Environmental Engineering Department; Faculty of Engineering; University Putra Malaysia; Selangor Malaysia
| | - Y. Nami
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - D. Radiah
- Chemical and Environmental Engineering Department; Faculty of Engineering; University Putra Malaysia; Selangor Malaysia
| | - R. Rosli
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - A. Yari Khosroushahi
- Biotechnology Research Center; Faculty of Pharmacy; Tabriz University of Medical Sciences; Tabriz Iran
- Department of Pharmacognosy; Faculty of Pharmacy; Tabriz University of Medical Sciences; Tabriz Iran
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Lee P, Gam L, Yong V, Rosli R, Ng K, Chong P. Immunoproteomic analysis of antibody response to cell wall-associated proteins of Candida tropicalis. J Appl Microbiol 2014; 117:854-65. [DOI: 10.1111/jam.12562] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 05/20/2014] [Accepted: 06/03/2014] [Indexed: 01/10/2023]
Affiliation(s)
- P.Y. Lee
- Department of Biomedical Sciences; Faculty of Medicine and Health Sciences; Universiti Putra Malaysia; Serdang Selangor Malaysia
| | - L.H. Gam
- School of Pharmaceutical Sciences; Universiti Sains Malaysia; Penang Malaysia
| | - V.C. Yong
- School of Biosciences; Taylor's University (Lakeside Campus); Subang Jaya Selangor Malaysia
| | - R. Rosli
- Department of Obstetrics and Gynaecology; Faculty of Medicine and Health Sciences; Universiti Putra Malaysia; Serdang Selangor Malaysia
| | - K.P. Ng
- Department of Medical Microbiology; Faculty of Medicine; University of Malaya; Kuala Lumpur Malaysia
| | - P.P. Chong
- Department of Biomedical Sciences; Faculty of Medicine and Health Sciences; Universiti Putra Malaysia; Serdang Selangor Malaysia
- Translational Infectious Diseases Program; Centre for Translational Medicine; National University of Singapore; Singapore City Singapore
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Nami Y, Abdullah N, Haghshenas B, Radiah D, Rosli R, Yari Khosroushahi A. A newly isolated probiotic Enterococcus faecalis
strain from vagina microbiota enhances apoptosis of human cancer cells. J Appl Microbiol 2014; 117:498-508. [DOI: 10.1111/jam.12531] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 04/22/2014] [Accepted: 04/22/2014] [Indexed: 01/20/2023]
Affiliation(s)
- Y. Nami
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - N. Abdullah
- Chemical and Environmental Engineering Department; Faculty of Engineering; University Putra Malaysia; Selangor Malaysia
| | - B. Haghshenas
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - D. Radiah
- Chemical and Environmental Engineering Department; Faculty of Engineering; University Putra Malaysia; Selangor Malaysia
| | - R. Rosli
- Institute of Biosciences; University Putra Malaysia; Selangor Malaysia
| | - A. Yari Khosroushahi
- Biotechnology Research Center; Tabriz Iran
- Department of Pharmacognosy; Faculty of Pharmacy; Tabriz University of Medical Sciences; Tabriz Iran
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10
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Lee PY, Gam LH, Yong VC, Rosli R, Ng KP, Chong PP. Identification of immunogenic proteins of Candida parapsilosis by serological proteome analysis. J Appl Microbiol 2014; 116:999-1009. [PMID: 24299471 DOI: 10.1111/jam.12408] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [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: 11/07/2013] [Revised: 11/24/2013] [Accepted: 11/27/2013] [Indexed: 02/03/2023]
Abstract
AIMS Systemic candidiasis is the leading fungal bloodstream infection, and its incidence has been on the rise. Recently, Candida parapsilosis has emerged as an increasingly prevalent fungal pathogen, but little is known about its antigenic profile. Hence, the current work was performed to discover immunogenic proteins of C. parapsilosis using serological proteome analysis. METHODS AND RESULTS Cell wall proteins extracted from C. parapsilosis were resolved by two-dimensional electrophoresis followed by immunoblotting using antisera from experimentally infected mice. Mass spectrometry analysis of the 32 immunoreactive protein spots resulted in the identification of 12 distinct proteins. Among them, 11 proteins were known antigens of Candida albicans, whereas Idh2p was identified for the first time as an immunogenic protein of Candida species. Recombinant Idh2p was expressed in Escherichia coli, and its antigenicity was verified by immunoblot analysis. CONCLUSIONS An immunoproteomic approach was successfully applied to identify immunogenic proteins of C. parapsilosis, with Idh2p as a novel candidate antigen. The identified antigens may serve as potential biomarkers for development of diagnostic assay and/or vaccine for C. parapsilosis. SIGNIFICANCE AND IMPACT OF THE STUDY This work represents the first immunoproteomic analysis of C. parapsilosis, which provides new insights into host-pathogen interactions and pathogenesis of C. parapsilosis. The immunogenic proteins could be studied as biomarker candidates for C. parapsilosis.
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Affiliation(s)
- P Y Lee
- Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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Nordin N, Lai MI, Veerakumarasivam A, Ramasamy R, Abdullah S, Wendy-Yeo WY, Rosli R. Induced pluripotent stem cells: history, properties and potential applications. Med J Malaysia 2011; 66:4-9. [PMID: 23765134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The development of induced pluripotent stem cells (iPSCs) has been met with much enthusiasm and hailed as a breakthrough discovery by the scientific and research communities amidst the divisive and ongoing debates surrounding human embryonic stem cells (hESC) research. The discovery reveals the fact that embryonic pluripotency can be generated from adult somatic cells by the induction of appropriate transcriptional factor genes essential for maintaining the pluripotency. They provide an alternative source for pluripotent stem cells, thus representing a powerful new research tool besides their potential application in the field of regenerative medicine. In this review, the historical background of iPSCs generation will be discussed together with their properties and characteristics as well as their potential therapeutic applications.
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Affiliation(s)
- N Nordin
- Universiti Putra Malaysia, Obstetrics & Gynaecology, Universiti Putra Malaysia, Serdang, Selangor 43400 Malaysia.
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Chong P, Yong VC, Seow H, Rosli R. Gene expression profilling of mouse host response to Candida tropicalis infection. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.1908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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13
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Lim C, Wong W, Tung C, Rosli R, Seow H, Chong P. Differential Expression Study of a Potentially Novel Gene in Candida albicans Morphology Switching. Int J Infect Dis 2008. [DOI: 10.1016/j.ijid.2008.05.774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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14
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Hung LC, Wong SL, Chan LG, Rosli R, Ng ANA, Bresee JS. Epidemiology and strain characterization of rotavirus diarrhea in Malaysia. Int J Infect Dis 2006; 10:470-4. [PMID: 17046306 DOI: 10.1016/j.ijid.2006.05.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2005] [Revised: 04/28/2006] [Accepted: 05/03/2006] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVES The objectives of the study were to describe the epidemiology and strain characterization of rotavirus (RV), to determine the proportion of hospitalizations for diarrhea attributable to RV among children under 5 years of age, and to estimate the disease burden of RV diarrhea in Malaysia. METHODS All children 0-59 months of age admitted for acute gastroenteritis to Kuala Lumpur Hospital (KLH) or Hospital Umum Sarawak (HUS) were surveyed. The periods of surveillance were from February 1, 2001 to April 30, 2003 in KLH and April 1, 2001 to March 31, 2003 for HUS. RESULTS The highest rate of RV-associated diarrhea was among children aged 6-17 months, accounting for 55% of RV-associated diarrhea. There was no seasonality observed in either hospital. P[8]G9 strains were predominant, accounting for 73% of all strains in both hospitals, 80% from KLH and 61% from HUS. There was no mortality. CONCLUSIONS RV was responsible for 38% of hospitalizations for diarrhea. It was most common in the 6-17 months age group. There was no seasonality observed for RV-associated diarrhea. The most prevalent strain of RV was P[8]G9. The estimated incidence of RV-associated diarrhea was 27 per 10000 population under the age of 5 years per year.
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Affiliation(s)
- L C Hung
- Institute of Paediatrics, Kuala Lumpur Hospital, 50586 Kuala Lumpur, Malaysia.
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Ling KH, Rosli R, Duraisamy G, Nasir MT. The prevalence of MTHFR 677C-->T missense mutation, total plasma homocysteine levels and associated risk factors in Malay subjects. Med J Malaysia 2003; 58:243-54. [PMID: 14569745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The missense mutation of the methylenetetrahydrofolate reductase (MTHFR) gene 677C-->T is associated with modest elevation of homocysteine levels. The bio-ecogenetics factors of total homocysteine levels (tHcy) were investigated in a cross sectional study involving 53 randomly selected healthy Malay subjects. Results indicated that the prevalence of the homozygous 677T/T was 3.8% and heterozygous 677C/T was 17.0%. The levels of tHcy was higher in subjects aged more than 50 years (n = 7, 11.53 +/- 4.45 mumol/l) and in males (10.99 +/- 3.77 mumol/l) especially smoking males (12.19 +/- 3.62 mumol/l). THcy levels were low in the 3 pregnant subjects (4.44 mumol/l, p = 0.036) who were under folate supplementation.
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Affiliation(s)
- K H Ling
- Department of Human Growth and Development, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan
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Raja N, Shamsudin MN, Somarny W, Rosli R, Rahim RA, Radu S. Detection and molecular characterization of the zot gene in Vibrio cholerae and V. alginolyticus isolates. Southeast Asian J Trop Med Public Health 2001; 32:100-4. [PMID: 11485069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
A total of 11 Vibrio cholerae isolates from 1996-1998 outbreaks in Malaysia and 4 V. alginolyticus were analyzed. Isolates were characterized by polymerase chain reaction (PCR) and Southern hybridization for the presence of the gene encoding zonula occludens toxin (zot). Screening of zot gene by PCR revealed the presence of this gene in V. cholerae and V. alginolyticus. The zot gene from one V. cholerae Ogawa isolate that was cloned in a pCR 2.1 TOPO vector was sequenced. The sequences obtained were 99% homologous to the zot gene sequence from the Gene Bank.
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Affiliation(s)
- N Raja
- Department of Clinical Laboratory Sciences, Faculty of Medicine and Heath Sciences, University Putra Malaysia, Serdang, Selangor
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Mastura AB, Ambu S, Hasnah O, Rosli R. Spargana infection of frogs in Malaysia. Southeast Asian J Trop Med Public Health 1996; 27:51-2. [PMID: 9031400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Frogs caught from two States (Selangor and Langkawi) in Malaysia were examined for spargana of Spirometra sp. Infected frogs usually show no marks of infection but some had swelling and bleeding at the infection site. The size and weight of the infected frogs did not correlate with the infection status. The infection status in relation to human health is discussed.
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Affiliation(s)
- A B Mastura
- Division of Medical Ecology, Institute for Medical Research, Kuala Lumpur, Malaysia
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Gabig TG, Crean CD, Mantel PL, Rosli R. Function of wild-type or mutant Rac2 and Rap1a GTPases in differentiated HL60 cell NADPH oxidase activation. Blood 1995; 85:804-11. [PMID: 7833480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Studies of neutrophil nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activation in a cell-free system showed that the low molecular-weight guanosine triphosphatase (GTPase) Rac was required, and that Rap1a may participate in activation of the catalytic complex. Full-length posttranslationally modified Rac2 was active, whereas only the 1-166 truncated form of Rap1a was functional in the cell-free system, and thus, clarification of the function of Rap1a and Rac2 in intact human phagocytes is needed to provide further insight into their roles as signal transducers from plasma membrane receptors. In the present studies, oligonucleotide-directed mutagenesis was used to introduce a series of mutations into human rap1a or rac2 in the mammalian expression vector pSR alpha neo. HL60 cells transfected with wild-type or mutated rac2 or rap1a cDNA constructs and control HL60 cells transfected with the pSR alpha neo vector containing no inserted cDNA were selected in G418-containing media, then subclones were isolated. Compared with the parent HL60 cells, each of the stable transfected cell lines differentiated similarly into neutrophil-like cells and expressed comparable levels of NADPH oxidase components p47-phox, p67-phox and gp91-phox. The differentiated vector control cell line produced O2. in response to receptor stimulation at rates that were not significantly different from parent HL60 cells. O2-. production by differentiated cell lines expressing mutated N17 Rap1a or N17 Rac2 dominant-negative proteins was inhibited, whereas O2-. production by the subline overexpressing wild-type Rap1a was increased by fourfold. O2-. production by the differentiated cell line expressing GTPase-defective V12 Rap1a was also significantly inhibited, a finding that is consistent with a requirement for cycling between guanosine diphosphate- and GTP-bound forms of Rap1a for continuous NADPH oxidase activation in intact neutrophils. A model is proposed in which Rac2 mediates assembly of the p47 and p67 oxidase components on the cytosolic face of the plasma membrane via cytoskeletal reorganization, whereas Rap1a functions downstream as the final activation switch involving direct physical interaction with the transmembrane flavocytochrome component of the NADPH oxidase.
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Affiliation(s)
- T G Gabig
- Department of Medicine, Indiana University School of Medicine, Indianapolis 46202-5121
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Gabig TG, Mantel PL, Rosli R, Crean CD. Requiem: a novel zinc finger gene essential for apoptosis in myeloid cells. J Biol Chem 1994; 269:29515-9. [PMID: 7961935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
To identify genes mediating programmed cell death triggered by interleukin 3 (IL-3)-deprivation of myeloid cells, the IL-3-dependent murine myeloid cell line FDCP-1 was used to screen a mammalian cell expression library for cDNAs that would promote survival following withdrawal of IL-3. A unique 892-base pair cDNA was cloned that prevented the programmed cell death response following IL-3 deprivation by causing antisense suppression of an endogenous 2.4-kilobase (kb) mRNA. A 2.3-kb cDNA containing the identical 892-base pair over-lapping sequence was cloned that encoded a deduced 371-amino acid protein containing a single Kruppel-type zinc finger and a cluster of 4 cysteine/histidine-rich repeats resembling atypical zinc fingers. The 2.4-kb mRNA was found to be ubiquitously expressed in murine tissues and its abundance in FDCP-1 cells was not altered in response to IL-3 deprivation. Since expression of this 2.4-kb mRNA was a prerequisite for the apoptosis response following IL-3 deprivation, the gene encoding it was named requiem. Requiem is likely to encode a transcription factor required for the apoptosis response following survival factor withdrawal from myeloid cells.
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Affiliation(s)
- T G Gabig
- Department of Medicine, Indiana University School of Medicine, Indianapolis 46202-5121
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