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Siddiqui R, Swank S, Ozark A, Joaquin F, Travis MP, McMahan CD, Bell MA, Stuart YE. Inferring the evolution of reproductive isolation in a lineage of fossil threespine stickleback, Gasterosteus doryssus. Proc Biol Sci 2024; 291:20240337. [PMID: 38628124 PMCID: PMC11021931 DOI: 10.1098/rspb.2024.0337] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Accepted: 03/19/2024] [Indexed: 04/19/2024] Open
Abstract
Darwin attributed the absence of species transitions in the fossil record to his hypothesis that speciation occurs within isolated habitat patches too geographically restricted to be captured by fossil sequences. Mayr's peripatric speciation model added that such speciation would be rapid, further explaining missing evidence of diversification. Indeed, Eldredge and Gould's original punctuated equilibrium model combined Darwin's conjecture, Mayr's model and 124 years of unsuccessfully sampling the fossil record for transitions. Observing such divergence, however, could illustrate the tempo and mode of evolution during early speciation. Here, we investigate peripatric divergence in a Miocene stickleback fish, Gasterosteus doryssus. This lineage appeared and, over approximately 8000 generations, evolved significant reduction of 12 of 16 traits related to armour, swimming and diet, relative to its ancestral population. This was greater morphological divergence than we observed between reproductively isolated, benthic-limnetic ecotypes of extant Gasterosteus aculeatus. Therefore, we infer that reproductive isolation was evolving. However, local extinction of G. doryssus lineages shows how young, isolated, speciating populations often disappear, supporting Darwin's explanation for missing evidence and revealing a mechanism behind morphological stasis. Extinction may also account for limited sustained divergence within the stickleback species complex and help reconcile speciation rate variation observed across time scales.
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Affiliation(s)
- Raheyma Siddiqui
- Department of Biology, Loyola University Chicago, Chicago, IL, USA
| | - Samantha Swank
- Department of Biology, Loyola University Chicago, Chicago, IL, USA
- Committee on Development, Regeneration, and Stem Cell Biology, University of Chicago, Chicago, IL, USA
| | - Allison Ozark
- Department of Biology, Loyola University Chicago, Chicago, IL, USA
| | - Franklin Joaquin
- Department of Biology, Loyola University Chicago, Chicago, IL, USA
| | - Matthew P. Travis
- Department of Biological and Biomedical Sciences, Rowan University, Glassboro, NJ, USA
| | | | - Michael A. Bell
- University of California Museum of Paleontology, Berkeley, CA, USA
| | - Yoel E. Stuart
- Department of Biology, Loyola University Chicago, Chicago, IL, USA
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2
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Mdkhana B, Goel S, Saleh MA, Siddiqui R, Khan NA, Elmoselhi AB. Role of oxidative stress in angiogenesis and the therapeutic potential of antioxidants in breast cancer. Eur Rev Med Pharmacol Sci 2022; 26:4677-4692. [PMID: 35856359 DOI: 10.26355/eurrev_202207_29192] [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: 06/15/2023]
Abstract
The escalation of cancer cases globally, especially breast cancer, is of concern. Angiogenesis is hallmark of cancer pathogenesis and plays an important role in cancer progression and metastasis. Pro-angiogenic agents, secreted by tumor cells, form new blood vessels, and produce reactive oxygen species (ROS). ROS promote angiogenesis via two major pathways: namely Vascular Endothelial Growth Factor (VEGF) dependent and non-VEGF dependent pathways. As a consequence of unbalanced ROS overproduction and low antioxidants levels, oxidative stress occurs and promotes angiogenesis in breast cancer tissues. Thus, the potential use of antioxidants as a preventive therapy in breast cancer. Preclinical studies depict that vitamins A and E may counter oxidative stress resulting in reduction of metastasis and viability of breast cancer. Furthermore, clinical studies demonstrate a decline in breast cancer risk in postmenopausal women upon the consumption of antioxidants. Herein, we discuss various pro-angiogenic agents that may play an important role in breast cancer angiogenesis. Moreover, the contribution of oxidative stress in inducing the angiogenic process is extensively reviewed here. Furthermore, the findings of pre-clinical and clinical studies on the use of antioxidants, namely vitamins A and E, in breast cancer are deliberated upon, along with the role of angiogenesis in cancer therapy.
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Affiliation(s)
- B Mdkhana
- Sharjah Institute of Medical Research, Clinical Sciences Department, College of Medicine, University of Sharjah, Sharjah, UAE.
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3
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Moni SS, Alam MF, Sultan MH, Makeen HA, Alhazmi HA, Mohan S, Alam MS, Rehman ZU, Jabeen A, Sanobar S, Elmobark ME, Siddiqui R, Anwer T. Spectral analysis, in vitro cytotoxicity and antibacterial studies of bioactive principles from the leaves of Conocarpus lancifolius, a common tree of Jazan, Saudi Arabia. BRAZ J BIOL 2021; 83:e244479. [PMID: 34320049 DOI: 10.1590/1519-6984.244479] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 01/26/2021] [Indexed: 11/22/2022] Open
Abstract
The objective of the present study was to analyse the bioactive compounds of the leaves of Conocarpus lancifolius (C. lancifolius). The GC-MS analysis of the hot methanolic extract of the leaves (HMEL) of C. lancifolius exhibited the bioactive compounds such as 1-(3-Methoxy-2-nitrobenzyl) iso quinoline, morphin-4-ol-6,7-dione, 1-bromo-N-methyl-, phytol, hexadecanoic acid, 2,3-dihydroxypropyl ester, 2,2':4',2"-terthiophene, ethyl iso-allocholate, caryophyllene oxide, campesterol, epiglobulol, cholestan-3-ol, 2-methylene-, (3á,5à)-, dasycarpidan-1-methanol, acetate (ester) and oleic acid, eicosyl ester. The FT-IR analysis of HMEL of C. lancifolius showed a unique peak at 3184, 2413, 1657 cm-1 representing coumaric acid, chlorogenic acid and ferulic acid. The HMEL of C. lancifolius was actively inhibiting the proliferation of breast cancer cells MCF-7 ATCC at the concentration of 72.66 ± 8.21 µg/ml as IC50 value. The HMEL of C. lancifolius also revealed a good spectrum of activity against Gram-positive and Gram-negative bacterial cultures screened in this work. The activity observed has shown more or less similar effects against screened bacteria. However, the magnitude of potentiality was significantly lesser compared to standard ciprofloxacin disc at p< 0.001 level (99% confidence intervals). Furthermore, the study demonstrating the bioactive compounds can be isolated from the leaves of C. lancifolius.
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Affiliation(s)
- S S Moni
- Jazan University, College of Pharmacy, Department of Pharmaceutics, Jazan, Saudi Arabia
| | - M F Alam
- Jazan University, College of Pharmacy, Department of Pharmacology and Toxicology, Jazan, Saudi Arabia
| | - M H Sultan
- Jazan University, College of Pharmacy, Department of Pharmaceutics, Jazan, Saudi Arabia
| | - H A Makeen
- Jazan University, College of Pharmacy, Clinical Pharmacy Department, Pharmacy Practice Research Unit, Jazan, Saudi Arabia.,Jazan University, Ethnopharmacology Research Unit, Jazan, Saudi Arabia
| | - H A Alhazmi
- Jazan University, Substance Abuse and Toxicology Research Centre, Jazan, Saudi Arabia.,Jazan University, College of Pharmacy, Department of Pharmaceutical Chemistry, Jazan, Saudi Arabia
| | - S Mohan
- Jazan University, Substance Abuse and Toxicology Research Centre, Jazan, Saudi Arabia
| | - Md S Alam
- Jazan University, College of Pharmacy, Department of Pharmaceutical Chemistry, Jazan, Saudi Arabia
| | - Z Ur Rehman
- Jazan University, College of Pharmacy, Department of Pharmaceutical Chemistry, Jazan, Saudi Arabia
| | - A Jabeen
- Jazan University, College of Pharmacy, Department of Pharmaceutics, Jazan, Saudi Arabia
| | - S Sanobar
- Jazan University, College of Pharmacy, Department of Pharmacognosy, Jazan, Saudi Arabia
| | - M E Elmobark
- Jazan University, College of Pharmacy, Department of Pharmaceutics, Jazan, Saudi Arabia
| | - R Siddiqui
- Jazan University, College of Pharmacy, Department of Pharmacology and Toxicology, Jazan, Saudi Arabia
| | - T Anwer
- Jazan University, College of Pharmacy, Department of Pharmacology and Toxicology, Jazan, Saudi Arabia
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4
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Soopramanien M, Khan NA, Siddiqui R. Gut microbiota of animals living in polluted environments are a potential resource of anticancer molecules. J Appl Microbiol 2021; 131:1039-1055. [PMID: 33368930 DOI: 10.1111/jam.14981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 08/21/2020] [Revised: 12/09/2020] [Accepted: 12/21/2020] [Indexed: 12/17/2022]
Abstract
Cancer is a prominent cause of morbidity and mortality worldwide, in spite of advances in therapeutic interventions and supportive care. In 2018 alone, there were 18·1 million new cancer cases and 9·6 million deaths indicating the need for novel anticancer agents. Plant-based products have often been linked with protective effects against communicable and non-communicable diseases. Recently, we have shown that animals such as crocodiles thrive in polluted environments and are often exposed to carcinogenic agents, but still benefit from prolonged lifespan. The protective mechanisms shielding them from cancer could be attributed to the immune system, and/or it is possible that their gut microbiota produce anticancer molecules. In support, several lines of evidence suggest that gut microbiota plays a critical role in the physiology of its host. Here, we reviewed the available literature to assess whether the gut microbiota of animals thriving in polluted environment possess anticancer molecules.
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Affiliation(s)
- M Soopramanien
- Department of Biological Sciences, Sunway University, Bandar Sunway, Malaysia
| | - N A Khan
- Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - R Siddiqui
- College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
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Siddiqui R, Akbar N, Khan NA. Gut microbiome and human health under the space environment. J Appl Microbiol 2020; 130:14-24. [PMID: 32692438 DOI: 10.1111/jam.14789] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [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: 06/12/2020] [Revised: 07/10/2020] [Accepted: 07/15/2020] [Indexed: 12/17/2022]
Abstract
The gut microbiome is well recognized to have a pivotal role in regulation of the health and behaviour of the host, affecting digestion, metabolism, immunity, and has been linked to changes in bones, muscles and the brain, to name a few. However, the impact of microgravity environment on gut bacteria is not well understood. In space environments, astronauts face several health issues including stress, high iron diet, radiation and being in a closed system during extended space missions. Herein, we discuss the role of gut bacteria in the space environment, in relation to factors such as microgravity, radiation and diet. Gut bacteria may exact their effects by synthesis of molecules, their absorption, and through physiological effects on the host. Moreover we deliberate the role of these challenges in the dysbiosis of the human microbiota and possible dysregulation of the immune system.
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Affiliation(s)
- R Siddiqui
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
| | - N Akbar
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
| | - N A Khan
- Department of Biology, Chemistry and Environmental Sciences, College of Arts and Sciences, American University of Sharjah, University City, Sharjah, United Arab Emirates
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6
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Akbar N, Siddiqui R, Iqbal M, Sagathevan K, Khan NA. Gut bacteria of cockroaches are a potential source of antibacterial compound(s). Lett Appl Microbiol 2018; 66:416-426. [PMID: 29457249 DOI: 10.1111/lam.12867] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [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: 11/27/2017] [Revised: 02/08/2018] [Accepted: 02/09/2018] [Indexed: 12/19/2022]
Abstract
Here, we hypothesized that the microbial gut flora of animals/pests living in polluted environments, produce substances to thwart bacterial infections. The overall aim of this study was to source microbes inhabiting unusual environmental niches for potential antimicrobial activity. Two cockroach species, Gromphadorhina portentosa (Madagascar) and Blaptica dubia (Dubia) were selected. The gut bacteria from these species were isolated and grown in RPMI 1640 and conditioned media were prepared. Conditioned media were tested against a panel of Gram-positive (Methicillin-resistant Staphylococcus aureus, Streptococcus pyogenes, Bacillus cereus) and Gram-negative (Escherichia coli K1, Salmonella enterica, Serratia marcescens, Pseudomonas aeruginosa, Klebsiella pneumoniae) bacteria, as well as the protist pathogen, Acanthamoeba castellanii. The results revealed that the gut bacteria of cockroaches produce active molecule(s) with potent antibacterial properties, as well as exhibit antiamoebic effects. However, heat-inactivation at 95°C for 10 min had no effect on conditioned media-mediated antibacterial and antiamoebic properties. These results suggest that bacteria from novel sources i.e. from the cockroach's gut produce molecules with bactericidal as well as amoebicidal properties that can ultimately lead to the development of therapeutic drugs. SIGNIFICANCE AND IMPACT OF THE STUDY The bacteria isolated from unusual dwellings such as the cockroaches' gut are a useful source of antibacterial and antiamoebal molecules. These are remarkable findings that will open several avenues in our search for novel antimicrobials from unique sources. Furthermore studies will lead to the identification of molecules to develop future antibacterials from insects.
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Affiliation(s)
- N Akbar
- Department of Biological Sciences, School of Science and Technology, Sunway University, Bandar Sunway, Malaysia
| | - R Siddiqui
- Department of Biological Sciences, School of Science and Technology, Sunway University, Bandar Sunway, Malaysia
| | - M Iqbal
- National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan
| | - K Sagathevan
- Department of Biological Sciences, School of Science and Technology, Sunway University, Bandar Sunway, Malaysia
| | - N A Khan
- Department of Biological Sciences, School of Science and Technology, Sunway University, Bandar Sunway, Malaysia
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7
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Lucier KJ, Movilla RV, Parvizian MK, Siddiqui R, Gabriele EH, Bourque M, MacIsaac J, Moorehead PC, Chan AK, Heddle NM, Lane SJ. A brief survey of clinicians' perceptions of parent preferences for involvement in obstetrical and perinatal management decisions in haemophilia. Haemophilia 2018; 24:e80-e83. [PMID: 29418048 DOI: 10.1111/hae.13430] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2018] [Indexed: 11/28/2022]
Affiliation(s)
- K J Lucier
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - R V Movilla
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - M K Parvizian
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - R Siddiqui
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - E H Gabriele
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - M Bourque
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - J MacIsaac
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
| | - P C Moorehead
- Section of Pediatric Hematology/Oncology, Janeway Children's Health and Rehabilitation Centre, St. John's, NL, Canada.,Faculty of Medicine, Discipline of Pediatrics, Memorial University, St. John's, NL, Canada.,Janeway Pediatric Research Unit, Memorial University, St. John's, NL, Canada
| | - A K Chan
- Department of Pediatrics, McMaster University, McMaster Children's Hospital, Hamilton, ON, Canada
| | - N M Heddle
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada.,Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada
| | - S J Lane
- Department of Medicine, McMaster Centre for Transfusion Research, McMaster University, Hamilton, ON, Canada
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Abstract
Zusammenfassung
Next Generation Sequencing (NGS) erlaubt die Untersuchung des kompletten Exoms oder Genoms eines Patienten mit vertretbarem zeitlichem und finanziellem Aufwand. Dieser diagnostische Quantensprung hat neben rechtlichen, ethischen und ökonomischen Aspekten auch vielfältige Auswirkungen auf die Patientenversorgung. Die weitgehende Einführung des NGS in die Routinediagnostik steht momentan jedoch noch vor vielen Hürden. Insbesondere ist zu erwarten, dass mittels NGS eine Vielzahl seltener Varianten bei einem Patienten entdeckt wird, die nach derzeitigem Wissensstand klinisch nicht hinreichend klar interpretierbar sind. Als einen ersten Schritt zur Lösung dieses Problems wird das Konzept einer Datenbank vorgestellt, die systematisch genotypische und phänotypische Informationen aus dem Versorgungskontext in Deutschland integrieren soll. Die so entstehende Ressource wäre nicht nur von großem wissenschaftlichem Interesse. Sie böte vordringlich den klinisch tätigen Humangenetikern die notwendige Evidenzbasis für eine zuverlässige Bewertung ihrer patientenbezogenen Sequenzierungsdaten.
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Affiliation(s)
- T. Bettecken
- Aff1 grid.419548.5 0000000094975095 Max-Planck-Institut für Psychiatrie Kraepelinstr. 2–10 80804 München Deutschland
| | - A. Pfeufer
- Aff2 grid.4567.0 0000000404832525 Institut für Bioinformatik und Systembiologie Helmholtz-Zentrum München Deutschland
- Aff3 grid.461735.2 0000 0004 0436 7803 Praxis für Humangenetik Isar Medizin Zentrum München Deutschland
- Aff4 Myriad GmbH Martinsried Deutschland
| | - R. Sudbrak
- Aff5 grid.419538.2 0000000090710620 Abteilung Analyse des Vertebratengenoms Max-Planck-Institut für Molekulare Genetik Berlin Deutschland
- Aff6 grid.473915.d Alacris Theranostics GmbH Berlin Deutschland
| | - R. Siddiqui
- Aff7 TMF - Technologie- und Methodenplattform für die vernetzte medizinische Forschung e. V. Berlin Deutschland
| | - A. Franke
- Aff8 grid.9764.c 0000000121539986 Institut für Klinische Molekularbiologie Christian-Albrechts-Universität Kiel Kiel Deutschland
| | - T.F. Wienker
- Aff9 grid.419538.2 0000000090710620 Abteilung Molekulare Humangenetik Max-Planck-Institut für Molekulare Genetik Berlin Deutschland
| | - M. Krawczak
- Aff7 TMF - Technologie- und Methodenplattform für die vernetzte medizinische Forschung e. V. Berlin Deutschland
- Aff10 grid.9764.c 0000000121539986 Institut für Medizinische Informatik und Statistik Christian-Albrechts-Universität Kiel Kiel Deutschland
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9
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Nahrir S, AlSinaidi O, Siddiqui R, Sinha S, Nicholls D, Siddiqui K. Neurology Tools: Usage Frequency (P06.023). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p06.023] [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: 11/15/2022] Open
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10
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Ahmed B, Fatmi Z, Siddiqui R. SP1-9 Predictors of unintentional poisoning among children under-5 years of age in Karachi: a matched case-control study. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976m.86] [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: 11/04/2022]
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11
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Beg M, Siddiqui R, Ahmad K, Humayun K. P2-498 Parents' perceptions and practices regarding consanguinity related to - thalassaemia: a matched case control study. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976m.25] [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: 11/04/2022]
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12
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Siddiqui R, Siti AH. Use of reducing agents for the aerobic growth of Campylobacter jejuni. ASIAN PAC J TROP MED 2010. [DOI: 10.1016/s1995-7645(10)60016-8] [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: 11/16/2022] Open
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13
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Sauermann U, Siddiqui R, Suh YS, Platzer M, Leuchte N, Meyer H, Mätz-Rensing K, Stoiber H, Nürnberg P, Hunsmann G, Stahl-Hennig C, Krawczak M. Mhc class I haplotypes associated with survival time in simian immunodeficiency virus (SIV)-infected rhesus macaques. Genes Immun 2007; 9:69-80. [PMID: 18094710 DOI: 10.1038/sj.gene.6364448] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In both human immunodeficiency virus-infected humans and simian immunodeficiency virus (SIV)-infected macaques, genes encoded in the major histocompatibility complex (MHC) class I region are important determinants of disease progression. However, compared to the human human lymphocyte antigen complex, the macaque MHC region encodes many more class I genes. Macaques with the same immunodominant class I genes express additional Mhc genes with the potential to influence the disease course. We therefore assessed the association between of the Mhc class I haplotypes, rather than single gene variants, and survival time in SIV-infected rhesus macaques (Macaca mulatta). DNA sequence analysis and Mhc genotyping of 245 pedigreed monkeys identified 17 Mhc class I haplotypes that constitute 10 major genotypes. Among 81 vaccination-naive, SIV-infected macaques, 71 monkeys carried at least one Mhc class I haplotype encoding only MHC antigens that were incapable of inducing an effective anti-SIV cytotoxic T lymphocytes response. Study of these macaques enabled us to relate individual Mhc class I haplotypes to slow, medium and rapid disease progression. In a post hoc analysis, classification according to disease progression was found to explain at least 48% of the observed variation of survival time.
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Affiliation(s)
- U Sauermann
- Department of Virology and Immunology, German Primate Center, Leibniz Institute for Primate Research, Göttingen, Germany.
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14
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Bevan V, Siddiqui R, Harris C. Improving the quality framework in virology laboratories. J Clin Virol 2006. [DOI: 10.1016/s1386-6532(06)80911-x] [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: 11/15/2022]
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15
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Larsen PB, Hansen EG, Jacobsen LS, Wiis J, Holst P, Rottensten H, Siddiqui R, Wittrup H, Sørensen AM, Persson S, Engbaek J. Intubation conditions after rocuronium or succinylcholine for rapid sequence induction with alfentanil and propofol in the emergency patient. Eur J Anaesthesiol 2005; 22:748-53. [PMID: 16211732 DOI: 10.1017/s0265021505001249] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [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: 12/17/2022]
Abstract
BACKGROUND AND OBJECTIVE Previous studies mainly conducted on elective patients recommend doses of 0.9-1.2 mg kg[-1] rocuronium to obtain comparable intubation conditions with succinylcholine 1.0 mg kg[-1] after 60 s during a rapid-sequence induction. We decided to compare the overall intubating conditions of standard doses of rocuronium 0.6 mg kg[-1] and succinylcholine 1.0 mg kg[-1] during a strict rapid-sequence induction regimen including propofol and alfentanil. METHODS Male and female patients (ASA I-III) older than 17 yr scheduled for emergency abdominal or gynaecological surgery and with increased risk of pulmonary aspiration of gastric content were randomized to a rapid-sequence induction with succinylcholine 1.0 mg kg[-1] or rocuronium 0.6 mg kg[-1]. Patients with a predicted difficult airway were excluded. A senior anaesthesiologist 'blinded' for the randomization performed the intubation 60 s after injection of the neuromuscular blocker. Intubating conditions were evaluated according to an established guideline. Tracheal intubation not completed within 30 s was recorded as failed. RESULTS 222 patients were randomized. Three patients had their operation cancelled and 10 did not fulfil the inclusion criteria. Clinically acceptable intubation conditions were present in 93.5% and 96.1% of patients in the succinylcholine group (n=107) and the rocuronium group (n=102), respectively (P=0.59). CONCLUSIONS During a rapid-sequence induction with alfentanil and propofol, both rocuronium 0.6 mg kg[-1] and succinylcholine 1.0 mg kg[-1] provide clinically acceptable intubation conditions in 60 s in patients scheduled for emergency surgery. Under the conditions of this rapid-sequence induction regimen rocuronium may be a substitute for succinylcholine.
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Affiliation(s)
- P B Larsen
- University of Copenhagen, Department of Anaesthesiology, Herlev Hospital, Glostrup, Denmark.
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16
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Mesaik M, Khan K, Rahat S, Zia-Ullah ZU, Choudhary M, Murad S, Abdullah N, Atta-ur-Rahman AUR, Ahmad A, Siddiqui R. Immunomodulatory Properties of Synthetic Imidazolone Derivatives. LETT DRUG DES DISCOV 2005. [DOI: 10.2174/1570180054771554] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Siddiqui R, Robles Diaz L, Nafa K, Kauff N, Facio F, Huang H, Onel K, Robson M, Ellis N, Offit K. TP53 and CHEK2 * 1100delC gene mutation in North American families suggestive Li-Fraumeni syndrome: Memorial Sloan-Kettering experience. J Clin Oncol 2004. [DOI: 10.1200/jco.2004.22.90140.9537] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- R. Siddiqui
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - L. Robles Diaz
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - K. Nafa
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - N. Kauff
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - F. Facio
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - H. Huang
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - K. Onel
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - M. Robson
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - N. Ellis
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
| | - K. Offit
- Memorial Sloan-Kettering Cancer Center, New York, NY; Hospital Universitario Doce de Octubre, Madrid, Spain
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Siddiqui R. The impact of socio-economic factors on fertility behaviour: a cross-country analysis. Pak Dev Rev 2002; 35:107-28. [PMID: 12321254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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19
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Peacock CS, Sanjeevi CB, Shaw MA, Collins A, Campbell RD, March R, Silveira F, Costa J, Coste CH, Nascimento MD, Siddiqui R, Shaw JJ, Blackwell JM. Genetic analysis of multicase families of visceral leishmaniasis in northeastern Brazil: no major role for class II or class III regions of HLA. Genes Immun 2002; 3:350-8. [PMID: 12209362 DOI: 10.1038/sj.gene.6363852] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [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: 09/06/2001] [Revised: 01/09/2002] [Accepted: 01/16/2002] [Indexed: 01/26/2023]
Abstract
Familial aggregation, high relative risk to siblings, and segregation analysis, suggest genetic control of visceral leishmaniasis in Brazil. Class II gene effects in mice, and high circulating tumour necrosis factor alpha in humans, provide reasons to target HLA. Fifteen polymorphic markers across 1.03 Mb (DQB1 to TNFa) were genotyped (87 multicase families; 638 individuals). Model-based parametric analyses using single-point combined segregation and linkage in COMDS, or multi-point linkage in ALLEGRO, failed to detect linkage. Model-free nonparametric affected sibling pair (SPLINK) or NPL(all) score (ALLEGRO) analyses also failed to detect linkage. Information content mapping confirmed sufficient marker information to detect linkage. Analysis of simulated data sets demonstrated that these families had 100% power to detect NPL(all) scores of 5 to 6 (>LOD4; P < 0.00001) over the range (7% to 61%) of age-related penetrances for a disease susceptibility gene. The extended transmission disequilibrium test (TDT) showed no consistent allelic associations between disease and the 15 loci. TDT also failed to detect significant associations between extended haplotypes and disease, consistent with failure to detect significant linkage disequilibrium across the region. Linkage disequilibrium between adjacent groups of markers (HLADQ/DR; 82-1/82-3/-238bpTNFA; LTA/62/TNFa) was not accompanied by significant global haplotype TDT associations with disease. The data suggest that class II/III regions of HLA do not contain major disease gene(s) for visceral leishmaniasis in Brazil.
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Affiliation(s)
- C S Peacock
- Cambridge Institute for Medical Research, Wellcome Trust/MRC Building, Addenbrooke's Hospital, Hills Road, Cambridge CB2 2XY, UK
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20
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Karim A, Ahmed S, Rossoff LJ, Siddiqui R, Fuchs A, Multz AS. Fulminant ischaemic colitis with atypical clinical features complicating sickle cell disease. Postgrad Med J 2002; 78:370-2. [PMID: 12151697 PMCID: PMC1742404 DOI: 10.1136/pmj.78.920.370] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [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: 11/03/2022]
Abstract
Clinically significant ischaemic bowel injury is an exceedingly rare complication of sickle cell disease. It manifests as acute surgical abdomen and may respond to conservative treatment. An unusual fatal case of ischaemic colitis with minimal abdominal findings in a young male during a sickle cell vaso-occlusive pain crisis is described. This case demonstrates that an acute surgical abdomen should be considered in such patients who fail to respond to conservative management as untreated this condition may be fatal.
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Affiliation(s)
- Anita Karim
- Pulmonary and Critical Care Medicine, Long Island Jewish Medical Center, LI Campus of the Albert Einstein College of Medicine, 270-05 76th Avenue, New Hyde Park, NY 11042, USA.
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Affiliation(s)
- A Karim
- Department of Medicine, Long Island Jewish Medical Center, New Hyde Park, New York 11040, USA
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22
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Peacock CS, Collins A, Shaw MA, Silveira F, Costa J, Coste CH, Nascimento MD, Siddiqui R, Shaw JJ, Blackwell JM. Genetic epidemiology of visceral leishmaniasis in northeastern Brazil. Genet Epidemiol 2001; 20:383-96. [PMID: 11255246 DOI: 10.1002/gepi.8] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [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: 11/08/2022]
Abstract
Familial clustering of disease, racial differences in asymptomatic:disease ratios, and studies of mice all point to a genetic component for disease susceptibility in visceral leishmaniasis. Analysis of 87 multi-case pedigrees (824 individuals; 138 nuclear families) from a region of northeastern Brazil endemic for Leishmania chagasi demonstrates a high relative risk ratio (lambda(2S) = 34) to further siblings of affected sibling pairs. Complex segregation analysis using POINTER and COMDS show that all single locus models, as well as polygenic and multifactorial models, provide a significantly (P < 0.001) better fit to the data than a sporadic model. Of the genetic models, the general single locus model was not significantly different from additive or dominant single locus models, all of which gave a gene frequency for the putative disease susceptibility allele of approximately 0.002. The general single locus model was strongly favored (P < 0.001) over a recessive single gene model. Using POINTER, polygenic and multifactorial models were clearly rejected (P < 0.001 in all cases) in favor of the general single locus model. Using COMDS, the analysis was extended to consider two locus models. Results under a general two-locus model did not differ significantly from the dominant, additive, or general single locus models. Under this model, one locus was estimated at a gene frequency of 0.0017, i.e., in the same range as the disease susceptibility locus for the most favored single gene models, with the second locus at a much lower frequency of 0.0002. Hence, the data support the hypothesis that a single major gene may be important in determining disease susceptibility in this population. To identify the gene(s) involved, a genome scan with replication using two subsets of these larger pedigrees with power to detect linkage is in progress.
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Affiliation(s)
- C S Peacock
- Wellcome Trust Centre for Molecular Mechanisms in Disease, Cambridge Institute for Medical Research, University of Cambridge Clinical School, Addenbrooke's Hospital, Cambridge, United Kingdom
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23
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Fatima M, Ahmad I, Siddiqui R, Raisuddin S. Paper and pulp mill effluent-induced immunotoxicity in freshwater fish Channa punctatus (Bloch). Arch Environ Contam Toxicol 2001; 40:271-276. [PMID: 11243330 DOI: 10.1007/s002440010172] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The influence of temperature variation on the humoral immune response using the plaque-forming cell (PFC) assay in freshwater fish Channa punctatus (Bloch) was investigated. The fish was exposed to 1% concentration (v/v in water) of paper and pulp mill effluent under standard laboratory conditions in glass aquaria. Effect of effluent exposure on the organ weight and organ cellularity was also evaluated. In general, lower temperature in winter produced a subdued response in control as well as experimental group. At higher temperature of summer and rainy seasons, an elevated response was observed. It was revealed that though suppressive effect of effluent was evident during all the seasons, in summer, extent of suppression was greater as compared to winter. Paper and pulp mill effluent exposure resulted in a decrease in the splenic and pronephric (head kidney) cellularity, with more pronounced effect in the summer season. We also studied the effects of the length of exposure on various parameters. Fish were exposed for 15, 30, 60, and 90 days to effluent. Short-term exposure for 15 days induced an elevated PFC response, but change was not statistically significant. Conversely, the exposure for 30, 60, and 90 days significantly reduced (p < 0.05-0.001) the PFC response. Long-term exposure also caused significant reduction (p < 0.05-0.01) in the weights of lymphoid organs (spleen, head kidney, and total kidney). These results show a suppressive effect of chemical constituents of paper and pulp mill effluent on the immune functions. Furthermore, results demonstrated that though modulatory effect of the temperature on immune functions is recognized, it was not a major contributory factor to the elevated immunotoxicity of paper and pulp mill effluent in the seasons of high temperature.
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Affiliation(s)
- M Fatima
- Department of Medical Elementology and Toxicology, Jamia Hamdard (Hamdard University), New Delhi, India
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Siddiqui R, Baig SA. Cultivation of human stem cells in the laboratory. J PAK MED ASSOC 2000; 50:423-5. [PMID: 11191444] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- R Siddiqui
- Department of Biochemistry, Ziauddin Medical University, Karachi
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Marsh DR, Kadir MM, Husein K, Luby SP, Siddiqui R, Khalid SB. Adult mortality in slums of Karachi, Pakistan. J PAK MED ASSOC 2000; 50:300-6. [PMID: 11043020] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
OBJECTIVE Cause-specific death rates are rarely available to guide health interventions for adults in South Asia. We report mortality patterns among Karachi's urban poor. METHODS We conducted verbal autopsies for adult deaths under active surveillance during 1990-1993 in five urban slums of Karachi. Two physicians assigned underlying cause of death by consensus. Analysis included cause- and category-specific rates, 45Q15s and comparison with 1991 Japanese national statistics. RESULTS All 345 adult deaths (15-59 years) in the 5 slums (total population 45,389) were included. Male mortality exceeded female (4.4 vs 3.3/1000, p = .02). Noncommunicable diseases claimed 59% of deaths, communicable and reproductive 27% and injuries, 15%. The leading identified death rates (/100,000) among women were: circulatory disorders (66), maternal causes (33), tuberculosis (30), and burns (23); and among men they were: circulatory disorders (124) tuberculosis (30) and road traffic accidents (30). Overall Karachi adult mortality was 3.7 times Japanese rate. Compared to Japan, adults in Karachi had one to two orders of magnitude excess mortality due to maternal causes, tuberculosis and burns. Circulatory disorders and tuberculosis accounted for 47% of excess male mortality; these plus maternal causes and burns accounted for 55% of excess female mortality. CONCLUSION These mortality levels and patterns compel interventions and research for poor urban adults beyond maternal health. Women's health would equally benefit from tuberculosis control or burn prevention. Men need safer travel. Both need improved cardiovascular health.
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Affiliation(s)
- D R Marsh
- Save the Children, Westport, CT 06881, USA
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English D, Cui Y, Siddiqui R, Patterson C, Natarajan V, Brindley DN, Garcia JG. Induction of endothelial monolayer permeability by phosphatidate. J Cell Biochem 1999; 75:105-17. [PMID: 10462709] [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: 02/13/2023]
Abstract
Released into the vasculature from disrupted cells or transported to the surface of adjacent effectors, phosphatidate and related lipids may potentiate endothelial cell activation. However, the effect of these lipids on endothelial monolayer barrier integrity has not been reported. The present study documents the induction of endothelial monolayer permeability by phosphatidate. Both long (di-C18:1) and medium (di-C10; di-C8) chain length phosphatidates increased permeability of bovine pulmonary artery endothelial cell monolayers assessed using a well characterized assay system in vitro. Barrier disruption effected by dioctanoyl (di-C8) phosphatidate was markedly potentiated by the addition of propranolol, an inhibitor of endothelial cell "ecto"-phosphatidate phosphohydrolase (PAP), a lipid phosphate phosphohydrolase (LPP) that efficiently hydrolyzes extracellular substrate. Disruption of barrier function by phosphatidate did not result from its non-specific detergent characteristics, since a non-hydrolyzable but biologically inactive phosphonate analog of dioctanoyl phosphatidate, which retains the detergent characteristics of phosphatidate, did not induce permeability changes. Furthermore, neither diacylglycerol nor lyso-PA effected significant increases in monolayer permeability, indicating the observed response was due to phosphatidate rather than one of its metabolites. Phosphatidate-induced permeability was attenuated by preincubation of endothelial cells with the tyrosine kinase inhibitor, herbimycin A (10 microg/ml), and enhanced by the tyrosine phosphatase inhibitor, vanadate (100 microM), implicating a role for activation of intracellular tyrosine kinases in the response. In addition, phosphatidate increased the levels of intracellular free Ca(2+) in endothelial cells and ligated specific binding sites on endothelial cell plasma membranes, consistent with the presence of a phosphatidate receptor. Since phosphatidate generated within the plasma membrane of adherent effectors potentially interacts with endothelial membranes, we evaluated the influence of phosphatidate-enriched neutrophil plasma membranes on endothelial monolayer integrity. The effects of ectopic phosphatidate on endothelial monolayer permeability were mimicked by phosphatidate confined to neutrophil plasma membranes. We conclude that phosphatidate may be a physiologic modulator of endothelial monolayer permeability that exerts its effects by activating a receptor-linked, tyrosine kinase-dependent process which results in mobilization of intracellular stored Ca(2+)and consequent metabolic activation.
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Affiliation(s)
- D English
- Experimental Cell Research Laboratory, The Methodist Research Institute, Indianapolis, Indiana 46202,
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Garcia JG, Verin AD, Schaphorst K, Siddiqui R, Patterson CE, Csortos C, Natarajan V. Regulation of endothelial cell myosin light chain kinase by Rho, cortactin, and p60(src). Am J Physiol 1999; 276:L989-98. [PMID: 10362724 DOI: 10.1152/ajplung.1999.276.6.l989] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Inflammatory diseases of the lung are characterized by increases in vascular permeability and enhanced leukocyte infiltration, reflecting compromise of the endothelial cell (EC) barrier. We examined potential molecular mechanisms that underlie these alterations and assessed the effects of diperoxovanadate (DPV), a potent tyrosine kinase activator and phosphatase inhibitor, on EC contractile events. Confocal immunofluorescent microscopy confirmed dramatic increases in stress-fiber formation and colocalization of EC myosin light chain (MLC) kinase (MLCK) with the actin cytoskeleton, findings consistent with activation of the endothelial contractile apparatus. DPV produced significant time-dependent increases in MLC phosphorylation that were significantly attenuated but not abolished by EC MLCK inhibition with KT-5926. Pretreatment with the Rho GTPase-inhibitory C3 exotoxin completely abolished DPV-induced MLC phosphorylation, consistent with Rho-mediated MLC phosphatase inhibition and novel regulation of EC MLCK activity. Immunoprecipitation of EC MLCK after DPV challenge revealed dramatic time-dependent tyrosine phosphorylation of the kinase in association with increased MLCK activity and a stable association of MLCK with the p85 actin-binding protein cortactin and p60(src). Translocation of immunoreactive cortactin from the cytosol to the cytoskeleton was noted after DPV in concert with cortactin tyrosine phosphorylation. These studies indicate that DPV activates the endothelial contractile apparatus in a Rho GTPase-dependent fashion and suggests that p60(src)-induced tyrosine phosphorylation of MLCK and cortactin may be important features of contractile complex assembly.
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Affiliation(s)
- J G Garcia
- Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21224, USA.
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Abstract
Twenty-six persons from five families comprising 34 members residing in different areas of Saptari district of the eastern region of Nepal developed symptoms of epidemic dropsy over 6-8 weeks. Seventeen patients were studied during July-August 1996. The age of affected individuals varied from 3 to 75 years. Members who had not consumed food cooked in mustard oil or who were not residing with the family were spared. Mustard oil, which was used for cooking, was found to be contaminated with oil of Argemone mexicana seeds. Sanguinarine was detected in all mustard oil samples collected from the homes of affected families. Gastrointestinal symptoms were present in 82 per cent of cases a week or so prior to the onset of pedal oedema. Pitting oedema of the lower limbs, fever, and darkening of the skin were the most consistent features, found in all cases. Other prominent features such as local erythema (82 per cent) and tenderness (88 per cent) of the lower limbs were present in most cases. Two striking features not previously noted were perianal itching (100 per cent) and severe carditis (35 per cent) with congestive cardiac failure (29 per cent). Other unique features noted were 'sarcoid' skin changes (18 per cent), bilateral pleural effusion, and Roth's spots and subhyloid haemorrhages in the fundus in one patient. Other important findings were anaemia (88 per cent), hepatomegaly (41 per cent), pneumonia (35 per cent) and ascites (12 per cent). There were no deaths due to epidemic dropsy. In the majority of cases, oedema, cutaneous changes, and carditis showed a marked improvement in 2-3 weeks and patients were well after 6-8 weeks of follow-up.
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Affiliation(s)
- R Singh
- Department of Paediatrics, B.P. Koirala Institute of Health Sciences, Dharan, Nepal
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Siddiqui R, English D, Garcia JG. Rationale for juxtacrine regulation of neutrophil interactions with the stimulated endothelium. J Lab Clin Med 1995; 125:18-25. [PMID: 7822943] [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] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- R Siddiqui
- Department of Medicine, Indiana University School of Medicine, Indianapolis
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Cui Y, English D, Neel S, Harvey K, Siddiqui R, Akard L, Jansen J, Hughes CV. Parallel up-regulation of CD11B and CD45 on neutrophilic leukocytes exposed to soluble factors of oral pathogens. Biochem Mol Biol Int 1994; 33:45-54. [PMID: 7915925] [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: 05/22/2023]
Abstract
We tested culture supernatants from a battery of oral bacterial strains for their ability to influence the expression of CD11b and CD45 on the neutrophil plasma membrane. Several bacterial extracts stimulated the up-regulation of both CD11b and CD45 simultaneously. Two supernatants in particular (a clinical isolate of A. actinomycetemcomitans and F. nucleatum ATCC25586) potently stimulated the deployment of CD11b and CD45 from their intracellular storage site to the plasma membrane. Both supernatants inhibited superoxide release stimulated by exposure of neutrophils to formyl methionyl leucyl phenylalanine (FMLP) but had variable effects on superoxide release stimulated by phorbol myristate acetate (PMA). The ability of products of oral bacteria to modulate neutrophil plasma membrane antigen composition may regulate functional reactivity and thus be an important factor in the pathogenesis of periodontal infection and inflammation.
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Affiliation(s)
- Y Cui
- Department of Pediatric Dentistry, Indiana University School of Dentistry, Indianapolis
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Abstract
The ability of three strains of Listeria monocytogenes NCTC 7973, serovar 1/2a, NCTC 5124m serovar 4a, C-274 serovar 4b and one strain of L. seeligeri (SLCC 3954) to grow in TPB (Tryptose phosphate agar) at pH values between 5-9 and produce haemolysin has been investigated at two incubation temperatures. The minimum and maximum pH values at which haemolysin was detected were 5 and 9 respectively, at 20 degrees and 32 degrees C.
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Affiliation(s)
- S A Khan
- Department of Microbiology, University of Karachi, Pakistan
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Stewart EJ, Cinnamond MJ, Siddiqui R, Nicholls DP, Stanford CF. Effect of a heat and moisture retaining mask on exercise induced asthma. BMJ 1992; 304:479-80. [PMID: 1547419 PMCID: PMC1881096 DOI: 10.1136/bmj.304.6825.479] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- E J Stewart
- Department of Otolaryngology, Belfast City Hospital
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Siddiqui R, Khan AS, Tarique M, Kumar S, Siddiqui MA, Ahmad J. Some cardiac metabolic studies in experimental endotoxaemia. Indian J Med Res 1984; 80:699-702. [PMID: 6398279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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