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Prabhu P, Morise H, Kudo K, Beagle A, Mizuiri D, Syed F, Kotegar KA, Findlay A, Miller BL, Kramer JH, Rankin KP, Garcia PA, Kirsch HE, Vossel K, Nagarajan SS, Ranasinghe KG. Abnormal gamma phase-amplitude coupling in the parahippocampal cortex is associated with network hyperexcitability in Alzheimer's disease. Brain Commun 2024; 6:fcae121. [PMID: 38665964 PMCID: PMC11043655 DOI: 10.1093/braincomms/fcae121] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 03/08/2024] [Accepted: 04/07/2024] [Indexed: 04/28/2024] Open
Abstract
While animal models of Alzheimer's disease (AD) have shown altered gamma oscillations (∼40 Hz) in local neural circuits, the low signal-to-noise ratio of gamma in the resting human brain precludes its quantification via conventional spectral estimates. Phase-amplitude coupling (PAC) indicating the dynamic integration between the gamma amplitude and the phase of low-frequency (4-12 Hz) oscillations is a useful alternative to capture local gamma activity. In addition, PAC is also an index of neuronal excitability as the phase of low-frequency oscillations that modulate gamma amplitude, effectively regulates the excitability of local neuronal firing. In this study, we sought to examine the local neuronal activity and excitability using gamma PAC, within brain regions vulnerable to early AD pathophysiology-entorhinal cortex and parahippocampus, in a clinical population of patients with AD and age-matched controls. Our clinical cohorts consisted of a well-characterized cohort of AD patients (n = 50; age, 60 ± 8 years) with positive AD biomarkers, and age-matched, cognitively unimpaired controls (n = 35; age, 63 ± 5.8 years). We identified the presence or the absence of epileptiform activity in AD patients (AD patients with epileptiform activity, AD-EPI+, n = 20; AD patients without epileptiform activity, AD-EPI-, n = 30) using long-term electroencephalography (LTM-EEG) and 1-hour long magnetoencephalography (MEG) with simultaneous EEG. Using the source reconstructed MEG data, we computed gamma PAC as the coupling between amplitude of the gamma frequency (30-40 Hz) with phase of the theta (4-8 Hz) and alpha (8-12 Hz) frequency oscillations, within entorhinal and parahippocampal cortices. We found that patients with AD have reduced gamma PAC in the left parahippocampal cortex, compared to age-matched controls. Furthermore, AD-EPI+ patients showed greater reductions in gamma PAC than AD-EPI- in bilateral parahippocampal cortices. In contrast, entorhinal cortices did not show gamma PAC abnormalities in patients with AD. Our findings demonstrate the spatial patterns of altered gamma oscillations indicating possible region-specific manifestations of network hyperexcitability within medial temporal lobe regions vulnerable to AD pathophysiology. Greater deficits in AD-EPI+ suggests that reduced gamma PAC is a sensitive index of network hyperexcitability in AD patients. Collectively, the current results emphasize the importance of investigating the role of neural circuit hyperexcitability in early AD pathophysiology and explore its potential as a modifiable contributor to AD pathobiology.
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Affiliation(s)
- Pooja Prabhu
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
- Department of Data science and Computer Applications, Manipal Institute of Technology, Manipal 576104, India
| | - Hirofumi Morise
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
- Medical Imaging Business Center, Ricoh Company Ltd., Kanazawa 920-0177, Japan
| | - Kiwamu Kudo
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
- Medical Imaging Business Center, Ricoh Company Ltd., Kanazawa 920-0177, Japan
| | - Alexander Beagle
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Danielle Mizuiri
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
| | - Faatimah Syed
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Karunakar A Kotegar
- Department of Data science and Computer Applications, Manipal Institute of Technology, Manipal 576104, India
| | - Anne Findlay
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
| | - Bruce L Miller
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Joel H Kramer
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Katherine P Rankin
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Paul A Garcia
- Epilepsy Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Heidi E Kirsch
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
- Epilepsy Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
| | - Keith Vossel
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
- Mary S. Easton Center for Alzheimer’s Research and Care, Department of Neurology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Srikantan S Nagarajan
- Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA
| | - Kamalini G Ranasinghe
- Memory and Aging Center, Department of Neurology, University of California San Francisco, San Francisco, CA 94158, USA
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Kudo K, Ranasinghe KG, Morise H, Syed F, Sekihara K, Rankin KP, Miller BL, Kramer JH, Rabinovici GD, Vossel K, Kirsch HE, Nagarajan SS. Neurophysiological trajectories in Alzheimer's disease progression. eLife 2024; 12:RP91044. [PMID: 38546337 PMCID: PMC10977971 DOI: 10.7554/elife.91044] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2024] Open
Abstract
Alzheimer's disease (AD) is characterized by the accumulation of amyloid-β and misfolded tau proteins causing synaptic dysfunction, and progressive neurodegeneration and cognitive decline. Altered neural oscillations have been consistently demonstrated in AD. However, the trajectories of abnormal neural oscillations in AD progression and their relationship to neurodegeneration and cognitive decline are unknown. Here, we deployed robust event-based sequencing models (EBMs) to investigate the trajectories of long-range and local neural synchrony across AD stages, estimated from resting-state magnetoencephalography. The increases in neural synchrony in the delta-theta band and the decreases in the alpha and beta bands showed progressive changes throughout the stages of the EBM. Decreases in alpha and beta band synchrony preceded both neurodegeneration and cognitive decline, indicating that frequency-specific neuronal synchrony abnormalities are early manifestations of AD pathophysiology. The long-range synchrony effects were greater than the local synchrony, indicating a greater sensitivity of connectivity metrics involving multiple regions of the brain. These results demonstrate the evolution of functional neuronal deficits along the sequence of AD progression.
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Affiliation(s)
- Kiwamu Kudo
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San FranciscoSan FranciscoUnited States
- Medical Imaging Business Center, Ricoh Company LtdKanazawaJapan
| | - Kamalini G Ranasinghe
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
| | - Hirofumi Morise
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San FranciscoSan FranciscoUnited States
- Medical Imaging Business Center, Ricoh Company LtdKanazawaJapan
| | - Faatimah Syed
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
| | | | - Katherine P Rankin
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
| | - Bruce L Miller
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
| | - Joel H Kramer
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
| | - Gil D Rabinovici
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
- Department of Radiology and Biomedical Imaging, University of California, San FranciscoSan FranciscoUnited States
| | - Keith Vossel
- Memory and Aging Center,UCSF Weill Institute for Neurosciences, University of California, San FranciscoSan FranciscoUnited States
- Mary S. Easton Center for Alzheimer’s Research and Care, Department of Neurology, David Geffen School of Medicine, University of California, Los AngelesLos AngelesUnited States
| | - Heidi E Kirsch
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San FranciscoSan FranciscoUnited States
| | - Srikantan S Nagarajan
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San FranciscoSan FranciscoUnited States
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Kudo K, Ranasinghe KG, Morise H, Syed F, Sekihara K, Rankin KP, Miller BL, Kramer JH, Rabinovici GD, Vossel K, Kirsch HE, Nagarajan SS. Neurophysiological trajectories in Alzheimer's disease progression. bioRxiv 2024:2023.05.18.541379. [PMID: 37293044 PMCID: PMC10245777 DOI: 10.1101/2023.05.18.541379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Alzheimer's disease (AD) is characterized by the accumulation of amyloid-β and misfolded tau proteins causing synaptic dysfunction, and progressive neurodegeneration and cognitive decline. Altered neural oscillations have been consistently demonstrated in AD. However, the trajectories of abnormal neural oscillations in AD progression and their relationship to neurodegeneration and cognitive decline are unknown. Here, we deployed robust event-based sequencing models (EBMs) to investigate the trajectories of long-range and local neural synchrony across AD stages, estimated from resting-state magnetoencephalography. The increases in neural synchrony in the delta-theta band and the decreases in the alpha and beta bands showed progressive changes throughout the stages of the EBM. Decreases in alpha and beta band synchrony preceded both neurodegeneration and cognitive decline, indicating that frequency-specific neuronal synchrony abnormalities are early manifestations of AD pathophysiology. The long-range synchrony effects were greater than the local synchrony, indicating a greater sensitivity of connectivity metrics involving multiple regions of the brain. These results demonstrate the evolution of functional neuronal deficits along the sequence of AD progression.
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Affiliation(s)
- Kiwamu Kudo
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, 94143, USA
- Medical Imaging Business Center, Ricoh Company, Ltd., Kanazawa, 920-0177, Japan
| | - Kamalini G Ranasinghe
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
| | - Hirofumi Morise
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, 94143, USA
- Medical Imaging Business Center, Ricoh Company, Ltd., Kanazawa, 920-0177, Japan
| | - Faatimah Syed
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
| | | | - Katherine P Rankin
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
| | - Bruce L Miller
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
| | - Joel H Kramer
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
| | - Gil D Rabinovici
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, 94143, USA
| | - Keith Vossel
- Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, CA, 94158, USA
- Mary S. Easton Center for Alzheimer’s Research and Care, Department of Neurology, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
| | - Heidi E Kirsch
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, 94143, USA
| | - Srikantan S Nagarajan
- Biomagnetic Imaging Laboratory, Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, 94143, USA
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Syed F, Stogios N, Sockalingam S, Maunder R, Cobain M, Tai E, Nolan R, Peiris R, Huszti E. AN ASSESSMENT OF GOAL-DIRECTED BEHAVIOURS THAT PROMOTE HEALTH-RELATED QUALITY OF LIFE: A PROOF-OF-CONCEPT STUDY. Can J Cardiol 2022. [DOI: 10.1016/j.cjca.2022.08.103] [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: 11/25/2022] Open
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Ota Y, Liao E, Capizzano AA, Kurokawa R, Bapuraj JR, Syed F, Baba A, Moritani T, Srinivasan A. Diagnostic Role of Diffusion-Weighted and Dynamic Contrast-Enhanced Perfusion MR Imaging in Paragangliomas and Schwannomas in the Head and Neck. AJNR Am J Neuroradiol 2021; 42:1839-1846. [PMID: 34446460 DOI: 10.3174/ajnr.a7266] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 06/08/2021] [Indexed: 01/21/2023]
Abstract
BACKGROUND AND PURPOSE Distinguishing schwannomas from paragangliomas in the head and neck and determining succinate dehydrogenase (SDH) mutation status in paragangliomas are clinically important. We aimed to assess the clinical usefulness of DWI and dynamic contrast-enhanced MR imaging in differentiating these 2 types of tumors, as well as the SDH mutation status of paragangliomas. MATERIALS AND METHODS This retrospective study from June 2016 to June 2020 included 42 patients with 15 schwannomas and 27 paragangliomas (10 SDH mutation-positive and 17 SDH mutation-negative). ADC values, dynamic contrast-enhanced MRI parameters, and tumor imaging characteristics were compared between the 2 tumors and between the mutation statuses of paragangliomas as appropriate. Multivariate stepwise logistic regression analysis was performed to identify significant differences in these parameters. RESULTS Fractional plasma volume (P ≤ .001), rate transfer constant (P = .038), time-to-maximum enhancement (P < .001), maximum signal-enhancement ratio (P < .001) and maximum concentration of contrast agent (P < .001), velocity of enhancement (P = .002), and tumor characteristics including the presence of flow voids (P = .001) and enhancement patterns (P = .027) showed significant differences between schwannomas and paragangliomas, though there was no significant difference in ADC values. In the multivariate logistic regression analysis, fractional plasma volume was identified as the most significant value for differentiation of the 2 tumor types (P = .014). ADC values were significantly higher in nonhereditary than in hereditary paragangliomas, while there was no difference in dynamic contrast-enhanced MR imaging parameters. CONCLUSIONS Dynamic contrast-enhanced MR imaging parameters show promise in differentiating head and neck schwannomas and paragangliomas, while DWI can be useful in detecting SDH mutation status in paragangliomas.
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Affiliation(s)
- Y Ota
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - E Liao
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A A Capizzano
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - R Kurokawa
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - J R Bapuraj
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - F Syed
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Baba
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - T Moritani
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
| | - A Srinivasan
- From the Division of Neuroradiology, Department of Radiology, University of Michigan, Ann Arbor, Michigan
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Syed F, Gallagher S, Gurajala R, Karuppasamy K. Abstract No. 558 Does lung shunt fraction estimation using injection of 99mTc-MAA still vital in 90Y radioembolization dosimetry? A hypothetical study using patient specific information. J Vasc Interv Radiol 2021. [DOI: 10.1016/j.jvir.2021.03.368] [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: 11/25/2022] Open
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Gallagher S, Syed F, Gurajala R, Gill A, Levitin A, Karuppasamy K. Abstract No. 556 Real-time image-guided drainage of postsurgical pericardial effusion is an effective alternative to surgical window. J Vasc Interv Radiol 2021. [DOI: 10.1016/j.jvir.2021.03.366] [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: 10/21/2022] Open
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Syed F, Thatikonda N, Arumugham S, Narayanaswamy J, Ganesan V, Reddy Y. Glutamatergic dysfunction in resistant obsessive-compulsive disorder: An auditory mismatch negativity study. Eur Psychiatry 2021. [PMCID: PMC9476100 DOI: 10.1192/j.eurpsy.2021.1118] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
IntroductionObsessive-compulsive disorder (OCD) patients with poor response to serotonin reuptake inhibitors (SRIs) may have dysfunction involving other neurotransmitters, including glutamate. Mismatch negativity (MMN), an event-related potential dependent on glutamatergic functioning, has not been studied in the adult OCD population and SRI non-responders.ObjectivesTo compare the amplitude of MMN between OCD subjects who have responded(R) and not responded(NR) to SRIs, with healthy volunteers(HV).MethodsMMN was measured in 15 OCD subjects fulfilling DSM-IV criteria (8 non-responders and 7 responders) and 22 healthy volunteers. Auditory MMN was measured using a multi-feature paradigm consisting of two variants each in frequency, duration, and intensity domains. EEG was recorded using 64 channel electrodes at 1000Hz. Epochs of 700 ms were extracted for each stimulus. MMN was evaluated as peak difference between the deviant and standard stimulus. MMN amplitudes at Fz were used for comparison between the groups using Kruskal-Wallis test followed by posthoc analysis, with significance set at p<0.05.ResultsThere was no significant difference in age/gender distribution between the three groups and duration of illness between the two OCD groups. There was a significant difference in MMN amplitude of a frequency deviant between the three groups (H=7.312,P=0.026). Post-hoc pairwise analyses revealed a significant reduction in MMN amplitude in NRs as compared to the HV group (H=10.9,P=0.04).ConclusionsThe results are suggestive of glutamatergic dysfunction in OCD subjects with poor response to SRIs. The findings have to be replicated in larger samples employing other paradigms to evaluate glutamatergic functioning and have future potential in understanding treatment response to SRIs.
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Hefny M, Syed F, Ugwuoke A, Saunders P, Young SK. Clinical outcomes and cost analysis of one- versus two-stage bilateral hip arthroplasty. A retrospective study of a single surgeon experience. Journal of Orthopaedics, Trauma and Rehabilitation 2020. [DOI: 10.1177/2210491720971837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Purpose: One in 10 patients presenting for total hip arthroplasty (THA) will have significant osteoarthritis in both hips. In appropriately selected individuals, one-stage bilateral THA is a treatment option. This study aims to compare outcomes of one-stage bilateral THA with two-stage procedure. Methods: A retrospective review of a single surgeon series was conducted comparing One-stage bilateral THA (n = 59) with two-stage bilateral THA (n = 50). The primary outcomes were post-operative complication and the Oxford Hip Score. The secondary outcome was a financial analysis. Results: Complications were infrequent and comparable between both groups. Oxford hip scores were slightly higher in the one-stage group. One-staged bilateral THA had a lower cost but hospital tariff is higher for two-stage bilateral THA. Conclusion: In appropriately selected patients with bilateral hip arthritis, one-stage bilateral THA gives good clinical outcomes. However, the current payment system in the NHS makes two-stage bilateral THA more financially viable to the hospital.
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Affiliation(s)
- M Hefny
- Orthopaedic Department, South Warwickshire NHS Foundation Trust, Warwick, United Kingdom
| | - F Syed
- Orthopaedic Department, South Warwickshire NHS Foundation Trust, Warwick, United Kingdom
| | - A Ugwuoke
- Orthopaedic Department, South Warwickshire NHS Foundation Trust, Warwick, United Kingdom
| | - P Saunders
- Orthopaedic Department, South Warwickshire NHS Foundation Trust, Warwick, United Kingdom
| | - SK Young
- Orthopaedic Department, South Warwickshire NHS Foundation Trust, Warwick, United Kingdom
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Lwin S, Syed F, Di W, Petrova A, Kadiyirire T, Mellerio J, Hovnanian A, Qasim W, McGrath J. 738 Safety outcomes for first-in-man intradermal injections of lentiviral-engineered COL7A1-supplemented autologous fibroblasts in adults with recessive dystrophic epidermolysis bullosa. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.748] [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: 10/17/2022]
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Tagalakis AD, Maeshima R, Yu-Wai-Man C, Meng J, Syed F, Wu LP, Aldossary AM, McCarthy D, Moghimi SM, Hart SL. Peptide and nucleic acid-directed self-assembly of cationic nanovehicles through giant unilamellar vesicle modification: Targetable nanocomplexes for in vivo nucleic acid delivery. Acta Biomater 2017; 51:351-362. [PMID: 28110069 DOI: 10.1016/j.actbio.2017.01.048] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [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: 09/10/2016] [Revised: 01/16/2017] [Accepted: 01/16/2017] [Indexed: 12/29/2022]
Abstract
One of the greatest challenges for the development of genetic therapies is the efficient targeted delivery of therapeutic nucleic acids. Towards this goal, we have introduced a new engineering initiative in self-assembly of biologically safe and stable nanovesicle complexes (∼90 to 140nm) derived from giant unilamellar vesicle (GUV) precursors and comprising plasmid DNA or siRNA and targeting peptide ligands. The biological performance of the engineered nanovesicle complexes were studied both in vitro and in vivo and compared with cationic liposome-based lipopolyplexes. Compared with cationic lipopolyplexes, nanovesicle complexes did not show advantages in transfection and cell uptake. However, nanovesicle complexes neither displayed significant cytotoxicity nor activated the complement system, which are advantageous for intravenous injection and tumour therapy. On intravenous administration into a neuroblastoma xenograft mouse model, nanovesicle complexes were found to distribute throughout the tumour interstitium, thus providing an alternative safer approach for future development of tumour-specific therapeutic nucleic acid interventions. On oropharyngeal instillation, nanovesicle complexes displayed better transfection efficiency than cationic lipopolyplexes. The technological advantages of nanovesicle complexes, originating from GUVs, over traditional cationic liposome-based lipopolyplexes are discussed. STATEMENT OF SIGNIFICANCE The efficient targeted delivery of nucleic acids in vivo provides some of the greatest challenges to the development of genetic therapies. Giant unilamellar lipid vesicles (GUVs) have been used mainly as cell and tissue mimics and are instrumental in studying lipid bilayers and interactions. Here, the GUVs have been modified into smaller nanovesicles. We have then developed novel nanovesicle complexes comprising self-assembling mixtures of the nanovesicles, plasmid DNA or siRNA, and targeting peptide ligands. Their biophysical properties were studied and their transfection efficiency was investigated. They transfected cells efficiently without any associated cytotoxicity and with targeting specificity, and in vivo they resulted in very high and tumour-specific uptake and in addition, efficiently transfected the lung. The peptide-targeted nanovesicle complexes allow for the specific targeted enhancement of nucleic acid delivery with improved biosafety over liposomal formulations and represent a promising tool to improve our arsenal of safe, non-viral vectors to deliver therapeutic cargos in a variety of disorders.
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Affiliation(s)
- A D Tagalakis
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK.
| | - R Maeshima
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - C Yu-Wai-Man
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, 11-43 Bath Street, London EC1V 9EL, UK
| | - J Meng
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - F Syed
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - L-P Wu
- Centre for Pharmaceutical Nanotechnology and Nanotoxicology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - A M Aldossary
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
| | - D McCarthy
- UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, UK
| | - S M Moghimi
- Centre for Pharmaceutical Nanotechnology and Nanotoxicology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark; School of Medicine, Pharmacy and Health, Durham University, Stockton-on-Tees TS17 6BH, UK
| | - S L Hart
- Experimental and Personalised Medicine Section, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK
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Willatt J, Ruma JA, Azar SF, Dasika NL, Syed F. Imaging of hepatocellular carcinoma and image guided therapies - how we do it. Cancer Imaging 2017; 17:9. [PMID: 28259177 PMCID: PMC5336669 DOI: 10.1186/s40644-017-0110-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 12/09/2016] [Accepted: 02/14/2017] [Indexed: 02/08/2023] Open
Abstract
Treatment options for hepatocellular carcinoma have evolved over recent years. Interventional radiologists and surgeons can offer curative treatments for early stage tumours, and locoregional therapies can be provided resulting in longer survival times. Early diagnosis with screening ultrasound is the key. CT and MRI are used to characterize lesions and determine the extent of tumour burden. Imaging techniques are discussed in this article as the correct imaging protocols are essential to optimise successful detection and characterisation. After treatment it is important to establish regular imaging follow up with CT or MRI as local residual disease can be easily treated, and recurrence elsewhere in the liver is common.
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Affiliation(s)
- Jonathon Willatt
- Veterans Administration, University of Michigan, Ann Arbor, MI, USA.
| | - Julie A Ruma
- Veterans Administration, University of Michigan, Ann Arbor, MI, USA
| | - Shadi F Azar
- Veterans Administration, University of Michigan, Ann Arbor, MI, USA
| | - Nara L Dasika
- Veterans Administration, University of Michigan, Ann Arbor, MI, USA
| | - F Syed
- Veterans Administration, University of Michigan, Ann Arbor, MI, USA
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Rutkowski D, Syed F, Matthews LC, Ray DW, McGrouther DA, Watson REB, Bayat A. An abnormality in glucocorticoid receptor expression differentiates steroid responders from nonresponders in keloid disease. Br J Dermatol 2015; 173:690-700. [PMID: 25712143 PMCID: PMC4744777 DOI: 10.1111/bjd.13752] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [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] [Accepted: 01/27/2015] [Indexed: 11/29/2022]
Abstract
Background Glucocorticoids (GCs) are first‐line treatment for keloid disease (KD) but are limited by high incidence of resistance, recurrence and undesirable side‐effects. Identifying patient responsiveness early could guide therapy. Methods Nineteen patients with KD were recruited at week 0 (before treatment) and received intralesional steroids. At weeks 0, 2 and 4, noninvasive imaging and biopsies were performed. Responsiveness was determined by clinical response and a significant reduction in vascular perfusion following steroid treatment, using full‐field laser perfusion imaging (FLPI). Responsiveness was also evaluated using (i) spectrophotometric intracutaneous analysis to quantify changes in collagen and melanin and (ii) histology to identify changes in epidermal thickness and glycosaminoglycan (GAG) expression. Biopsies were used to quantify changes in glucocorticoid receptor (GR) expression using quantitative reverse transcriptase polymerase chain reaction, immunoblotting and immunohistochemistry. Results At week 2, the FLPI was used to separate patients into steroid responsive (n = 12) and nonresponsive groups (n = 7). All patients demonstrated a significant decrease in GAG at week 2 (P < 0·05). At week 4, responsive patients exhibited significant reduction in melanin, GAG, epidermal thickness (all P < 0·05) and a continued reduction in perfusion (P < 0·001) compared with nonresponders. Steroid‐responsive patients had increased GR expression at baseline and showed autoregulation of GR compared with nonresponders, who showed no change in GR transcription or protein. Conclusions This is the first demonstration that keloid response to steroids can be measured objectively using noninvasive imaging. FLPI is a potentially reliable tool to stratify KD responsiveness. Altered GR expression may be the mechanism gating therapeutic response. What's already known about this topic? Steroids are used as first‐line treatment for keloid disease, but response is variable with apparent steroid responders and nonresponders. It remains unclear whether steroid responsiveness is due to an intrinsic difference in the mechanism of the glucocorticoid receptor (GR) action or reduced sensitivity to the steroid itself.
What does this study add? We show for the first time the utility of noninvasive imaging techniques in stratifying steroid responsiveness in patients treated with steroids. GR expression increased significantly in keloid tissue. Increased GR expression also correlated with an increased response to steroid treatment. Steroid responders show a significant decrease in GR transcript and protein 2 weeks after steroid treatment (P < 0·05), which was not evident in steroid‐resistant patients.
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Affiliation(s)
- D Rutkowski
- Institute of Inflammation and Repair, Manchester Institute of Biotechnology, University of Manchester, Manchester, U.K
| | - F Syed
- Institute of Inflammation and Repair, Manchester Institute of Biotechnology, University of Manchester, Manchester, U.K
| | - L C Matthews
- Manchester Centre for Nuclear Hormone Research in Disease, Institute of Human Development, University of Manchester, Manchester, U.K
| | - D W Ray
- Manchester Centre for Nuclear Hormone Research in Disease, Institute of Human Development, University of Manchester, Manchester, U.K
| | - D A McGrouther
- Institute of Inflammation and Repair, Manchester Institute of Biotechnology, University of Manchester, Manchester, U.K
| | - R E B Watson
- Institute of Inflammation and Repair, Manchester Institute of Biotechnology, University of Manchester, Manchester, U.K
| | - A Bayat
- Institute of Inflammation and Repair, Manchester Institute of Biotechnology, University of Manchester, Manchester, U.K
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Honarmand A, Syed F, Hurley M, Shaibani A, Ansari S. P-034 comparison of the natural history and outcome measures in patients presented with unruptured and ruptured intracranial arteriovenous malformations. J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.73] [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: 11/03/2022]
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Honarmand A, Shaibani A, Syed F, Elmokadem A, Hurley M, Ansari S. P-006 evaluation of baseline ct aspects and admission neutrophil-lymphocyte ratio in perfusion-guided selected ica/mca stroke patients for endovascular reperfusion therapy. J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.45] [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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Honarmand A, Hurley M, Syed F, Ansari S, Shaibani A. E-004 intracranial venous hypertension due to severe focal web-like stenosis of the sigmoid sinus associated with contralateral sinus hypoplasia: a new diagnostic entity? J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.79] [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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Syed F, Honarmand A, Ban D, Elmokadem A, Daruwalla V, Hurley M, Shaibani A, Ansari S. E-126 favorable baseline ct aspects and dwi brainstem imaging in acute basilar artery occlusions are poor predictors of good functional outcome. J Neurointerv Surg 2015. [DOI: 10.1136/neurintsurg-2015-011917.200] [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: 11/03/2022]
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Soosaipillai G, Hawkesford K, Benafif S, Syed F, Shamash J. An Audit of the Use of Olanzapine as an Anti-emetic, in Combination with Ondansetron, Domperidone and Single Dose Dexamethasone, in Patients Undergoing BEP Chemotherapy (Cisplatin, Etoposide and Bleomycin) in Germ Cell Tumours. Clin Oncol (R Coll Radiol) 2015. [DOI: 10.1016/j.clon.2014.11.021] [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: 11/30/2022]
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Lachi P, Irrakula M, Syed F, Uppin M, Joseph D, Syed A, Nair D, Krishna V, Pamidighantam S, Naidu K. RT-16 * LARGE OCULOMOTOR NERVE SCHWANNOMA - RARE ENTITY. A CASE REPORT. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou270.13] [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: 11/13/2022] Open
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Syed F, Lachi P, Keshava R, Syed A, Nair D, Krishna V, Joseph D, Irrakula M, Pamidighantam S, Naidu K. RT-32 * CLINICAL PROFILE AND OUTCOMES IN BRAINSTEM GLIOMA. AN INSTITUTIONAL EXPERIENCE. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou270.28] [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: 11/13/2022] Open
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21
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Lachi P, Syed F, Keshava R, Syed A, Nair D, Joseph D, Irrakula M, Krishna V, Pamidighantam S, Naidu K. RT-17 * RADIOTHERAPY FOR INTRACRANIAL AND SPINAL EPENDYMOMAS. A RETROSPECTIVE ANALYSIS. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou270.14] [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: 11/14/2022] Open
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22
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Syed F, Lachi P, Chakravarthy P, Uppin S, Syed A, Nair D, Joseph D, Irrakula M, Pamidighantam S, Naidu K. MS-26 * EXTRA CRANIAL METASTASIS IN A CASE OF CEREBRAL MENINGIOMA: A RARE CASE REPORT. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou260.25] [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: 11/13/2022] Open
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Syed F, Palmer M, Messman A, Qiu S, Irvin C. 336 White and Privately Insured Medical Patients are More Likely to Have a Non-Head CT Scan in the Emergency Department. Ann Emerg Med 2014. [DOI: 10.1016/j.annemergmed.2014.07.364] [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: 11/28/2022]
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Akram K, Malik M, Joseph D, Ramgopal K, Syed F, Vijayakrishna E, Lachi P, Valiyaveettil D, Naidu J, Pamidighantam S. Irradiation of Stem Cell Niches in the Periventricular and Subgranular Zones in Glioblastoma: A Prospective Study. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.662] [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: 10/24/2022]
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Marselli L, Bugliani M, Suleiman M, Olimpico F, Masini M, Petrini M, Boggi U, Filipponi F, Syed F, Marchetti P. β-Cell inflammation in human type 2 diabetes and the role of autophagy. Diabetes Obes Metab 2013; 15 Suppl 3:130-6. [PMID: 24003929 DOI: 10.1111/dom.12152] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 04/18/2013] [Indexed: 12/27/2022]
Abstract
β-Cell failure is crucial for the onset and progression of human type 2 diabetes, and a few studies have suggested that inflammation may play a role. Immune cell infiltration has been reported in subpopulations of islets in some cases of human type 2 diabetes, and altered gene expression of a few cytokines and chemokines has been observed in isolated islets and laser captured β-cells from diabetic subjects. Recent observations on the links between inflammation, apoptosis and autophagy are putting the focus on the possibility that modulating the autophagic processes could protect the β-cells from cytotoxicity induced by inflammatory mediators.
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Affiliation(s)
- L Marselli
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
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Syed F, Chandra V, Del Carpio Munoz F, Cha Y, Friedman P, Hammill S, Munger T, Shen W, Packer D, Asirvatham S. Performance of surface electrocardiographic vectors in differentiating ventricular arrhythmia originating from coronary cusp, peri-pulmonic valve and right ventricular outflow tract. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4943] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Harvey B, Syed F, Kaymakcalan Z. THU0028 Fibroblast-like synoviocytes inhibit TNF- and RANKL-induced human osteoclast precursor differentiation following exposure to IL-1BETA. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.1993] [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: 11/03/2022]
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Tjahjadi C, Hamilton-Craig C, Syed F, Chan J, Burstow D, Platts D. Diagnostic Utility and Economic Impact of Contrast Echocardiography. Heart Lung Circ 2013. [DOI: 10.1016/j.hlc.2013.05.411] [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: 11/27/2022]
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Kesava Ramgopal A, E V, Pamidighantam S, Lachi P, Jilla S, Vindhyavasini A, Syed F, Irukulla M, K J, Sunkavalli V. Dynamic and Segmental Methods of Intensity Modulated Radiation Therapy Delivery in Head-and-Neck Cancer—Analysis of Volumetric and Dosimetric Parameters. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2112] [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: 11/27/2022]
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Ashcroft KJ, Syed F, Arscott G, Bayat A. Assessment of the influence of HLA class I and class II loci on the prevalence of keloid disease in Jamaican Afro-Caribbeans. ACTA ACUST UNITED AC 2011; 78:390-6. [DOI: 10.1111/j.1399-0039.2011.01755.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Samardhi H, Rateesh S, Syed F, Harley C, Aroney C, Raffel C, Walters D. Comparison of Transcoronary Ablation of Septal Hypertrophy (TASH) to Surgical Myomectomy in Hypertrophic Cardiomyopathy. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.300] [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: 11/24/2022]
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32
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Syed F, Vink E, Poon K, Savage M, Pincus M, Small A, Bett N, Chua R, Walters D, Raffel O. A Single Centre Experience in the Use of Rotational Atherectomy for the Percutaneous Management of Coronary Artery Disease. Heart Lung Circ 2011. [DOI: 10.1016/j.hlc.2011.05.283] [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: 10/18/2022]
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33
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Syed F, Ahmadi E, Iqbal S, Singh S, McGrouther D, Bayat A. Fibroblasts from the growing margin of keloid scars produce higher levels of collagen I and III compared with intralesional and extralesional sites: clinical implications for lesional site-directed therapy. Br J Dermatol 2010; 164:83-96. [DOI: 10.1111/j.1365-2133.2010.10048.x] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
The present study was undertaken to evaluate the teratogenic and behavioral effects of perinatal exposure to cyfluthrin (Synthetic Pyrethroid) on mice offspring. Humans are exposed to this compound as it is widely used in various household insecticide formulations and in public health programmes. Pregnant females were exposed to 16 mg/kg (low dose) and 32 mg/kg (high dose) body weight cyfluthrin daily by oral intubation from gestation day 14 through parturition and lactation up to weaning. On 18th day of gestation, 50% females were euthanized for teratological studies and the remaining were allowed to deliver their pups normally. The fetuses were weighed and observed for gross external malformations and routine teratological examination was done. The neonates were observed for neuromotor reflexes (surface righting, tail hang reflex and pivoting) from day 1 up to day 7 after birth. Movement and exploratory behavior of weanlings were observed using ‘open-field’ and ‘hole-board.’ The fetuses did not show any external malformation. Skeletal aberrations observed included poor ossification of the skull and phalanges and short ribs. Surface righting and pivoting were significantly affected by the high dose. Both doses produced significant changes in the locomotion, exploration, and rearing frequencies in the open-field. The study indicates that cyfluthrin when administered at the above-mentioned doses did not elicit significant teratogenicity but both the doses caused significant difference in behavioral activities.
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Affiliation(s)
- I. Soni
- Environmental Toxicology and Animal Behavior Laboratories, Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur, Rajasthan, India
| | - F. Syed
- Environmental Toxicology and Animal Behavior Laboratories, Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur, Rajasthan, India,
| | - P. Bhatnagar
- Environmental Toxicology and Animal Behavior Laboratories, Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur, Rajasthan, India
| | - R. Mathur
- Environmental Toxicology and Animal Behavior Laboratories, Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur, Rajasthan, India
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Iqbal S, Syed F, McGrouther D, Paus R, Bayat A. Differential distribution of haematopoietic and nonhaematopoietic progenitor cells in intralesional and extralesional keloid: do keloid scars provide a niche for nonhaematopoietic mesenchymal stem cells? Br J Dermatol 2010; 162:1377-83. [DOI: 10.1111/j.1365-2133.2010.09738.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Samardhi H, Harley C, Syed F, Raffel C, Savage M, Aroney C, Walters D. An Experience of Transcoronary Ablation of Septal Hypertrophy (TASH) in Hypertrophic Cardiomyopathy. Heart Lung Circ 2010. [DOI: 10.1016/j.hlc.2010.06.949] [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: 11/24/2022]
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37
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Wolske J, van Veen K, Syed F, Russell J, Tibazarwa K, Ntsekhe M, Mayosi B, Wilkinson R, Lange C, Wilkinson K. Does tuberculous pericardial disease severity have distinct immunological features? Pneumologie 2009. [DOI: 10.1055/s-0029-1213943] [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: 10/21/2022]
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38
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Syed F, Huang CC, Li K, Liu V, Shang T, Amegadzie BY, Griswold DE, Song XYR, Li L. Identification of interleukin-13 related biomarkers using peripheral blood mononuclear cells. Biomarkers 2008; 12:414-23. [PMID: 17564846 DOI: 10.1080/13547500701192652] [Citation(s) in RCA: 23] [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: 10/23/2022]
Abstract
Asthma is a chronic disorder characterized by airway inflammation, reversible bronchial obstruction, hyper-responsiveness and remodelling. Data from human in vitro studies and experimental in vivo models of asthma has implicated interleukin (IL)-13 in the asthma phenotype suggesting that a therapeutic agent against it could be effective in treating asthma. The role of biomarkers is becoming increasingly important in the clinical development of therapeutics. Here we describe the use of the GeneChip((R)) DNA microarray technology platform to explore and identify potential response to therapy biomarkers that are associated with the biology of IL-13. Peripheral blood mononuclear cells (PBMCs) from eight healthy donors were cultured in the presence of IL-13, IL-4, an anti-IL-13 monoclonal antibody (mAb) or an isotype control mAb, and RNA from the treated cells was subjected to microarray analysis. The results revealed a number of genes, such as CCL17 (TARC), CCL22 (MDC), CCL23 (MPIF-1), CCL26 (eotaxin 3) and WNT5A (human wingless-type MMTV integration site family member 5A), that showed increased expression in the IL-13 and IL-4 treatment groups. Real-time polymerase chain reaction (PCR) subsequently confirmed these results. A follow-up study in PBMCs from five additional healthy donors showed that the neutralization of IL-13 completely blocked IL-13-induced TARC, MDC and eotaxin 3 production at the protein level. These data suggest that TARC, MDC, eotaxin 3, CCL23 and WNT5A if validated could serve as potential biomarkers for anti-IL-13 therapeutics.
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Affiliation(s)
- F Syed
- Biomarkers & Novel Target Research, Centocor Research & Development Inc, Malvern, PA 19355, USA.
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Tan BK, Syed F, Lewandowski KC, O'Hare JP, Randeva HS. Circadian oscillation of circulating prothrombotic thrombospondin-1: ex vivo and in vivo regulation by insulin. J Thromb Haemost 2008; 6:1827-30. [PMID: 18853485 DOI: 10.1111/j.1538-7836.2008.03123.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Carter A, Murphy MO, Turner NJ, Halka AT, Ghosh J, Serracino-Inglott F, Walker MG, Syed F. Intimal Neovascularisation is a Prominent Feature of Atherosclerotic Plaques in Diabetic Patients with Critical Limb Ischaemia. Eur J Vasc Endovasc Surg 2007; 33:319-24. [PMID: 17164094 DOI: 10.1016/j.ejvs.2006.10.021] [Citation(s) in RCA: 13] [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] [Received: 07/03/2006] [Accepted: 10/15/2006] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Neovascularisation of atherosclerotic plaques correlates with increased plaque instability and subsequent risk of vascular complications. Diabetics have widespread atherosclerotic involvement of the arterial tree and a more aggressive form of the disease culminating in increased plaque instability. This results in a greater incidence of ischaemic sequelae than in non-diabetics. Previous studies have examined neovascularisation as a marker of plaque instability in both the carotid and coronary territories and revealed a greater degree in both symptomatic and diabetic patients. This is the first study to examine intimal neovascularisation in lower limb peripheral arterial disease. METHODS Arterial specimens were taken from 20 patients, ten of whom were type 2 diabetics, undergoing major lower limb amputation for unreconstructable critical ischaemia. Sections were stained with H&E for morphological assessment and inflammatory cell characterisation. Additional sections underwent immunohistochemical staining for CD31 and von-Willebrand Factor (vWF) and the number of intimal vessels per four 40x magnification fields assessed. RESULTS There was a more prominent inflammatory infiltrate in diabetic subjects compared to non-diabetic controls. Diabetic patients had a greater degree of intimal neovascularisation compared to controls with a median of 11.5 and 2.0 vessels per field respectively (P<0.05). Sub-group analysis revealed that diabetic patients medicating with HMG-CoA Reductase inhibitors (Statins) had a greater degree of neovascularisation compared to those not taking this class of medication. CONCLUSION Diabetic patients with critical limb ischaemia requiring amputation demonstrate a greater degree of plaque intimal neovascularisation and inflammatory infiltrate compared to their non-diabetic counterparts. This may explain the greater plaque instability and subsequent cardiovascular complications seen in these patients.
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Affiliation(s)
- A Carter
- Department of Vascular Surgery, Manchester Royal Infirmary, Oxford Road, Manchester M13 9WL, UK
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Abstract
The severe asthma phenotype is exhibited by a subset of asthma patients whose asthma symptom is poorly controlled by current therapies. Severe asthma represents a high unmet medical need and warrants research into the mechanisms driving the underlying pathophysiology. It is hypothesized that the underlying pathology associated with severe asthma is driving the symptoms experienced by these patients, which may share common features with mild to moderate asthma or may represent a unique pathological phenotype. For the purpose of this review, the pathophysiology associated with asthma in general are described and extended to incorporate severe asthma. Chemokines may contribute towards multiple features of asthma pathophysiology and this current review focuses on the biology of chemokines pertaining to asthma pathophysiology. Chemokines are important recruiters and activators of inflammatory cells and these infiltrating cells interact with resident cells, such as fibroblasts and it is through these pathways that chemokines appear to exert multiple biological actions. Clinical trials are underway with therapeutics targeting chemokine pathways for other inflammatory diseases. It is hoped that the information generated from these studies will contribute towards furthering our understanding of chemokine biology and be applied towards targeting severe asthma.
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Affiliation(s)
- L A Murray
- Department of Immunobiology, Centocor Inc., 145 King of Prussia Road, Radnor, PA 19087, USA.
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Carter A, Serracino-Inglott F, Murphy M, Turner N, Halka A, Syed F, McMahon R, Walker N. Mo-P4:272 Intimal neovascularisation is a prominent feature ofatherosclerotic plaques ofdiabetic patients with critical limb ischaemia. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80405-8] [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: 10/23/2022]
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Adra CN, Donato JL, Badovinac R, Syed F, Kheraj R, Cai H, Moran C, Kolker MT, Turner H, Weremowicz S, Shirakawa T, Morton CC, Schnipper LE, Drews R. SMARCAD1, a novel human helicase family-defining member associated with genetic instability: cloning, expression, and mapping to 4q22-q23, a band rich in breakpoints and deletion mutants involved in several human diseases. Genomics 2000; 69:162-73. [PMID: 11031099 DOI: 10.1006/geno.2000.6281] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Members of the DEAD/H box-containing helicase superfamily include proteins essential to genome replication, repair, and expression. We report here the cloning and initial characterization of a novel human member of this protein family, designated hHel1 (human helicase 1), now designated SMARCAD1 by HUGO. This DEAD/H box-containing molecule has seven highly conserved sequence regions that allow us to place it in the SNF2 family of the helicase superfamily. Uniquely, though, hHel1 contains two DEAD/H box motifs, a property not reported to be shared by any other SNF2 family members. This defines a new subfamily consisting of hHel1 and its homologues. In addition to these DEAD/H box/ATP-binding motifs, hHel1 has a putative nuclear localization signal and several regions that may mediate protein-protein interactions. Expression analysis indicates that hHel1 transcripts are ubiquitous, with particularly high levels in endocrine tissue. We have mapped the gene for hHel1 to human chromosome 4q22-q23; this region is rich in breakpoints and deletion mutants of genes involved in several human diseases, notably soft tissue leiomyosarcoma, hepatocellular carcinoma, and hematologic malignancies. Our observation that human Hel1 gene overexpression is present in an E1A-expressing cell line with increased capacity for gene reactivation events by genomic rearrangement suggests that human Hel1 may play a role in genetic instability development.
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Affiliation(s)
- C N Adra
- Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, USA.
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Syed F, Blakemore SJ, Wallace DM, Trower MK, Johnson M, Markham AF, Morrison JF. CCR7 (EBI1) receptor down-regulation in asthma: differential gene expression in human CD4+ T lymphocytes. QJM 1999; 92:463-71. [PMID: 10627863 DOI: 10.1093/qjmed/92.8.463] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Asthma is an inflammatory disorder, and the CD4+ T lymphocyte plays a key role in mediating the inflammatory response. We used a high-density grid, hybridization-based, differential gene expression technology to analyse molecular mechanisms underlying in vivo CD4+ T-cell activation in both steroid-resistant asthma (SRA) and steroid-sensitive asthma (SSA). Hybridization of radioactively-labelled first-strand cDNAs prepared from different biological samples, to identical high-density gridded arrays of PCR amplicons derived from cDNA clone inserts immobilized on nylon membranes, was compared by phosphorimaging. Hybridization data were captured and processed using image analysis software that can identify the location and signal intensity of each hybridized cDNA. This produces a hierarchy of signals of differing intensities between the two grids, representing differential gene expression in the two different RNA samples. CCR7 (EBI1), a lymphocyte-specific G-protein-coupled receptor, was down-regulated in the CD4+ T cells of SRA and SSA non-atopic, compared to non-asthmatic non-atopic individuals. This observation is intriguing given that CCR7 and its ligand EBI1-Ligand Chemokine (ELC), may play a role in the migration and homing of normal lymphocytes. Also, TNFR2 is up-regulated in both SSA non-atopic and SRA atopic as compared to non-asthmatic controls. LAMR1 is down-regulated in CD4+ T cells of SRA compared to non-asthmatic individuals, irrespective of their atopic status. These could be general phenomena resulting from cytokine release.
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Affiliation(s)
- F Syed
- Molecular Medicine Unit, University of Leeds, St James's University Hospital, UK.
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Abstract
Phytohaemagglutinin (PHA)-induced T-cell proliferation is suppressed completely in steroid-sensitive asthma (SSA) by fluticasone propionate (FP). By contrast, in patients with steroid-resistant asthma (SRA), this proliferative response is only partially attenuated by steroids, which suggests that the T lymphocyte may harbour a key molecular defect in these patients. Both CD4+ and CD8+ T cells may be involved in orchestrating the inflammation underlying asthma. We examined whether CD4+ or CD8+ T cells isolated from SRA and SSA patients are equally susceptible to steroid suppression of PHA-induced proliferation. Complete suppression of CD4+ T-lymphocyte proliferation was seen in both SSA and control subjects at concentrations of 10(-9) M FP. In contrast, proliferation of CD4+ T cells from SRA patients was only partially inhibited, even at 10(-6) M FP. CD8+ responses from SRA, SSA and controls were all similar, with only a partial suppression of proliferation at 10(-6) M FP. Differential suppression by FP of CD4+ T cells has thus been demonstrated between SRA and SSA patients.
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Affiliation(s)
- F Syed
- Molecular Medicine Unit, University of Leeds, St James's University Hospital, UK.
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Watmough DJ, Bhargava S, Memon A, Syed F, Roy S, Sharma P. For debate. Does breast cancer screening depend on a wobbly hypothesis? J Public Health Med 1997; 19:375-9. [PMID: 9467140 DOI: 10.1093/oxfordjournals.pubmed.a024663] [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: 02/06/2023]
Affiliation(s)
- D J Watmough
- Department of Radiology, Faculty of Medicine, Kuwait University
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Sutton GC, Balmer S, Hodgson SV, Mohammed SN, Smith N, Dowell AC, Watmough DJ, Gharabawy F, Syed F. Screening for breast cancer Screen women over 65. West J Med 1994. [DOI: 10.1136/bmj.309.6955.664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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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Watmough DJ, Gharabawy F, Syed F. Screening for breast cancer. Discrepancies in studies are confusing. BMJ 1994; 309:664-5. [PMID: 8086997 PMCID: PMC2541472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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