1
|
Hayati Z, Montazeri V, Shivappa N, Hebert JR, Pirouzpanah S. The association between the inflammatory potential of diet and the risk of histopathological and molecular subtypes of breast cancer in northwestern Iran: Results from the Breast Cancer Risk and Lifestyle study. Cancer 2022; 128:2298-2312. [PMID: 35389510 DOI: 10.1002/cncr.34183] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 12/31/2021] [Accepted: 02/18/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND This study explored the association between diet-associated inflammation and the risk of different molecular subtypes of breast cancer (BrCA) in a large, population-based case-control study conducted in northwestern Iran. METHODS The study consisted of 1007 women with histopathologically confirmed BrCA and 1004 controls admitted to hospitals in Tabriz, northwestern Iran, for nonneoplastic conditions. Dietary Inflammatory Index scores and energy-adjusted Dietary Inflammatory Index (E-DII) scores, with and without supplements, were computed on the basis of dietary intake collected using a validated 136-item food frequency questionnaire. RESULTS Women with the highest E-DII scores (quartile 4) versus those with the lowest E-DII scores (quartile 1) showed a significantly increased BrCA risk (odds ratio for quartile 4 vs quartile 1 [ORQ4vsQ1 ], 1.87; 95% confidence interval [CI], 1.42-2.47), particularly for lobular carcinoma (ORQ4vsQ1 , 3.07; 95% CI, 1.34-7.02). Findings were similar for premenopausal women diagnosed with luminal A BrCA (ORQ4vsQ1 , 2.71; 95% CI, 1.74-4.22) or luminal B BrCA (ORQ4vsQ1 , 2.86; 95% CI, 1.39-5.89). Women consuming the most proinflammatory diets were 3 times more likely to have triple-negative BrCA (ORQ4vsQ1 , 3.00; 95% CI, 1.002-8.96) while compared to luminal A BrCA. The BrCA risk for women consuming diets in the highest half of E-DII scores (E-DII > 0) was 59% greater than the risk for those in the lowest half (95% CI, 1.29-1.97). Also, higher E-DII scores that took into account supplements were associated with larger tumor sizes (T3 > 5 cm; P < .05). CONCLUSIONS A proinflammatory diet, as indicated by higher E-DII scores, appears to increase the risk of BrCA in Iranian women. Large increases in risk were seen in invasive molecular subtypes of BrCA. Anti-inflammatory diets are suggested to prevent the risk of overall BrCA and more aggressive forms of BrCA in particular.
Collapse
Affiliation(s)
- Zahra Hayati
- Molecular Medicine Research Center, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Biochemistry and Dietetics, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.,Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vahid Montazeri
- Department of Thoracic Surgery, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nitin Shivappa
- Cancer Prevention and Control Program, University of South Carolina, Columbia, South Carolina.,Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina.,Department of Nutrition, Connecting Health Innovations LLC, Columbia, South Carolina
| | - James R Hebert
- Cancer Prevention and Control Program, University of South Carolina, Columbia, South Carolina.,Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, South Carolina.,Department of Nutrition, Connecting Health Innovations LLC, Columbia, South Carolina
| | - Saeed Pirouzpanah
- Molecular Medicine Research Center, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Biochemistry and Dietetics, Faculty of Nutrition and Food Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
2
|
Pranata A, Zulkifli B, Santosa SF, Oktiviyari A, Zulfitri Z, Hayati Z, Mudatsir M, Ichsan I, Harapan H. Discordant results of SARS-CoV-2 PCR-based tests in the early phase of pandemic in Indonesia: Infection control consequences. ACTA ACUST UNITED AC 2021; 23:139-143. [PMID: 34305496 PMCID: PMC8289727 DOI: 10.1016/j.vacun.2021.05.004] [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] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 05/14/2021] [Indexed: 11/17/2022]
Abstract
Introduction Growing evidence suggest that cycle threshold (CT)-value of reverse transcription polymerase chain reaction (RT-PCR) is correlated with transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and some kits set different CT-value cut-off. This report presents the discordant results of two widely used RT-PCR kits in Indonesia due to different CT-value cut-offs and highlights its potential consequence in SARS-CoV-2 containment. Methods Nasopharyngeal swab samples with SARS-CoV-2 negative with a RT-PCR kit (manufacture pre-set CT-value cut-off was 35 amplification cycles) were retested with another RT-PCR kit with a higher pre-set CT-value of 40 amplification cycles. All procedures were performed according to the manufacturer protocols. Results In total, 30 samples with SARS-CoV-2 negative for the first kit were retested. We found that 25 out of 33 samples (75.5%) were positive using the second RT-PCR kit that had a higher manufacture pre-set CT-value cut-off. In addition, among 500 RT-PCR tests using the first RT-PCR kit, 103 of them (20.6%) were categorized as inconclusive results based on the second manufacturer’ guideline. Discussion and conclusion Our data suggest the possibility of discordant results of SARS-CoV-2 detection due to different pre-set cut-offs by the companies. As consequence, this could leave a fraction of individuals who were misclassified that could act as source of virus transmission within community.
Collapse
Affiliation(s)
- A Pranata
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Parasitology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - B Zulkifli
- Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Biology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Center for Tropical Veterinary Studies, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - S F Santosa
- Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Laboratory of Research, Faculty of Veterinary Medicine, Syiah Kuala University, Banda Aceh 23111, Indonesia
| | - A Oktiviyari
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - Z Zulfitri
- Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Biology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - Z Hayati
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Microbiology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - M Mudatsir
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Microbiology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - I Ichsan
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Microbiology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| | - H Harapan
- Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Tropical Disease Centre, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Infectious Disease Laboratory, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia.,Department of Microbiology, School of Medicine, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia
| |
Collapse
|
3
|
Parish C, Niedbalski P, Wang Q, Khashami F, Hayati Z, Liu M, Song L, Lumata L. Effects of glassing matrix deuteration on the relaxation properties of hyperpolarized 13C spins and free radical electrons at cryogenic temperatures. J Chem Phys 2019; 150:234307. [PMID: 31228902 PMCID: PMC6588520 DOI: 10.1063/1.5096036] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 05/20/2019] [Accepted: 06/03/2019] [Indexed: 11/14/2022] Open
Abstract
Glassing matrix deuteration could be a beneficial sample preparation method for 13C dynamic nuclear polarization (DNP) when large electron paramagnetic resonance (EPR) width free radicals are used. However, it could yield the opposite DNP effect when samples are doped with small EPR width free radicals. Herein, we have investigated the influence of solvent deuteration on the 13C nuclear and electron relaxation that go along with the effects on 13C DNP intensities at 3.35 T and 1.2 K. For 13C DNP samples doped with trityl OX063, the 13C DNP signals decreased significantly when the protons are replaced by deuterons in glycerol:water or DMSO:water solvents. Meanwhile, the corresponding solid-state 13C T1 relaxation times of trityl OX063-doped samples generally increased upon solvent deuteration. On the other hand, 13C DNP signals improved by a factor of ∼1.5 to 2 upon solvent deuteration of samples doped with 4-oxo-TEMPO. Despite this 13C DNP increase, there were no significant differences recorded in 13C T1 values of TEMPO-doped samples with nondeuterated or fully deuterated glassing matrices. While solvent deuteration appears to have a negligible effect on the electron T1 relaxation of both free radicals, the electron T2 relaxation times of these two free radicals generally increased upon solvent deuteration. These overall results suggest that while the solid-phase 13C DNP signals are dependent upon the changes in total nuclear Zeeman heat capacity, the 13C relaxation effects are related to 2H/1H nuclear spin diffusion-assisted 13C polarization leakage in addition to the dominant paramagnetic relaxation contribution of free radical centers.
Collapse
Affiliation(s)
- Christopher Parish
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | | | - Qing Wang
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | - Fatemeh Khashami
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | | | | | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA
| | - Lloyd Lumata
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| |
Collapse
|
4
|
Hayati Z, Kaur P, Song L. Lipid Lateral Ordering of Raft Domains Defined by High-Field EPR. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.3280] [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: 11/17/2022] Open
|
5
|
Niedbalski P, Parish C, Wang Q, Hayati Z, Song L, Martins AF, Sherry AD, Lumata L. Transition Metal Doping Reveals Link between Electron T 1 Reduction and 13C Dynamic Nuclear Polarization Efficiency. J Phys Chem A 2017; 121:9221-9228. [PMID: 29125294 PMCID: PMC5793213 DOI: 10.1021/acs.jpca.7b09448] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Optimal efficiency of dissolution dynamic nuclear polarization (DNP) is essential to provide the required high sensitivity enhancements for in vitro and in vivo hyperpolarized 13C nuclear magnetic resonance (NMR) spectroscopy and imaging (MRI). At the nexus of the DNP process are the free electrons, which provide the high spin alignment that is transferred to the nuclear spins. Without changing DNP instrumental conditions, one way to improve 13C DNP efficiency is by adding trace amounts of paramagnetic additives such as lanthanide (e.g., Gd3+, Ho3+, Dy3+, Tb3+) complexes to the DNP sample, which has been observed to increase solid-state 13C DNP signals by 100-250%. Herein, we have investigated the effects of paramagnetic transition metal complex R-NOTA (R = Mn2+, Cu2+, Co2+) doping on the efficiency of 13C DNP using trityl OX063 as the polarizing agent. Our DNP results at 3.35 T and 1.2 K show that doping the 13C sample with 3 mM Mn2+-NOTA led to a substantial improvement of the solid-state 13C DNP signal by a factor of nearly 3. However, the other transition metal complexes Cu2+-NOTA and Co2+-NOTA complexes, despite their paramagnetic nature, had essentially no impact on solid-state 13C DNP enhancement. W-band electron paramagnetic resonance (EPR) measurements reveal that the trityl OX063 electron T1 was significantly reduced in Mn2+-doped samples but not in Cu2+- and Co2+-doped DNP samples. This work demonstrates, for the first time, that not all paramagnetic additives are beneficial to DNP. In particular, our work provides a direct evidence that electron T1 reduction of the polarizing agent by a paramagnetic additive is an essential requirement for the improvement seen in solid-state 13C DNP signal.
Collapse
Affiliation(s)
- Peter Niedbalski
- Department of Physics, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - Christopher Parish
- Department of Physics, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - Qing Wang
- Department of Physics, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
| | - André F. Martins
- Advanced Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Chemistry, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - A. Dean Sherry
- Advanced Imaging Research Center, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Chemistry, The University of Texas at Dallas, Richardson, TX 75080, USA
| | - Lloyd Lumata
- Department of Physics, The University of Texas at Dallas, Richardson, TX 75080, USA
| |
Collapse
|
6
|
Niedbalski P, Parish CR, Wang Q, Hayati Z, Song L, Cleveland ZI, Lumata L. Enhanced Efficiency of 13C Dynamic Nuclear Polarization by Superparamagnetic Iron Oxide Nanoparticle Doping. J Phys Chem C Nanomater Interfaces 2017; 121:19505-19511. [PMID: 31768206 PMCID: PMC6876865 DOI: 10.1021/acs.jpcc.7b06408] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Attainment of high NMR signal enhancements is crucial to the success of in vitro or in vivo hyperpolarized NMR or imaging (MRI) experiments. In this work, we report on the use of a superparamagnetic iron oxide nanoparticle (SPION) MRI contrast agent Feraheme (ferumoxytol) as a beneficial additive in 13C samples for dissolution dynamic nuclear polarization (DNP). Our DNP data at 3.35 T and 1.2 K reveal that addition of 11 mM elemental iron concentration of Feraheme in trityl OX063-doped 3 M [1-13C] acetate samples resulted in a substantial improvement of 13C DNP signal by a factor of almost 3-fold. Concomitant with the large DNP signal increase is the narrowing of the 13C microwave DNP spectra for samples doped with SPION. W-band electron paramagnetic resonance (EPR) spectroscopy data suggest that these two prominent effects of SPION doping on 13C DNP can be ascribed to the shortening of trityl OX063 electron T 1 as explained within the thermal mixing DNP model. Liquid-state 13C NMR signal enhancements as high as 20,000-fold for SPION-doped samples were recorded after dissolution at 9.4 T and 297 K, which is about 3 times the liquid-state NMR signal enhancement of the control sample. While the presence of SPION in hyperpolarized solution drastically reduces 13C T 1, this can be mitigated by polarizing smaller aliquots of DNP samples. Moreover, we have shown that Feraheme nanoparticles (~30 nm in size) can be easily and effectively removed from the hyperpolarized liquid by simple mechanical filtration, thus one can potentially incorporate an in-line filtration for these SPIONS along the dissolution pathway of the hyperpolarizer-a significant advantage over other DNP enhancers such as the lanthanide complexes. The overall results suggest that the commercially-available and FDA-approved Feraheme is a highly efficient DNP enhancer that could be readily translated for use in clinical applications of dissolution DNP.
Collapse
Affiliation(s)
- Peter Niedbalski
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080 USA
| | - Christopher R. Parish
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080 USA
| | - Qing Wang
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080 USA
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, FL 32310
| | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, FL 32310
| | - Zackary I. Cleveland
- Center for Pulmonary Imaging Research, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH 45229
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH 45221
| | - Lloyd Lumata
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, TX 75080 USA
| |
Collapse
|
7
|
Niedbalski P, Parish C, Wang Q, Kiswandhi A, Hayati Z, Song L, Lumata L. 13C Dynamic Nuclear Polarization Using a Trimeric Gd 3+ Complex as an Additive. J Phys Chem A 2017. [PMID: 28631929 DOI: 10.1021/acs.jpca.7b03869] [Citation(s) in RCA: 12] [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] [Indexed: 12/23/2022]
Abstract
Dissolution dynamic nuclear polarization (DNP) is one of the most successful techniques that resolves the insensitivity problem in liquid-state nuclear magnetic resonance (NMR) spectroscopy and imaging (MRI) by amplifying the signal by several thousand-fold. One way to further improve the DNP signal is the inclusion of trace amounts of lanthanides in DNP samples doped with trityl OX063 free radical as the polarizing agent. In practice, stable monomeric gadolinium complexes such as Gd-DOTA or Gd-HP-DO3A are used as beneficial additives in DNP samples, further boosting the DNP-enhanced solid-state 13C polarization by a factor of 2 or 3. Herein, we report on the use of a trimeric gadolinium complex as a dopant in 13C DNP samples to improve the 13C DNP signals in the solid-state at 3.35 T and 1.2 K and consequently, in the liquid-state at 9.4 T and 298 K after dissolution. Our results have shown that doping the 13C DNP sample with a complex which holds three Gd3+ ions led to an improvement of DNP-enhanced 13C polarization by a factor of 3.4 in the solid-state, on par with those achieved using monomeric Gd3+ complexes but only requires about one-fifth of the concentration. Upon dissolution, liquid-state 13C NMR signal enhancements close to 20 000-fold, approximately 3-fold the enhancement of the control samples, were recorded in the nearby 9.4 T high resolution NMR magnet at room temperature. Comparable reduction of 13C spin-lattice T1 relaxation time was observed in the liquid-state after dissolution for both the monomeric and trimeric Gd3+ complexes. Moreover, W-band electron paramagnetic resonance (EPR) data have revealed that 3-Gd doping significantly reduces the electron T1 of the trityl OX063 free radical, but produces negligible changes in the EPR spectrum, reminiscent of the results with monomeric Gd3+-complex doping. Our data suggest that the trimeric Gd3+ complex is a highly beneficial additive in 13C DNP samples and that its effect on DNP efficiency can be described in the context of the thermal mixing mechanism.
Collapse
Affiliation(s)
- Peter Niedbalski
- Department of Physics, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080 United States
| | - Christopher Parish
- Department of Physics, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080 United States
| | - Qing Wang
- Department of Physics, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080 United States
| | - Andhika Kiswandhi
- Department of Physics, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080 United States
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University , 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Likai Song
- National High Magnetic Field Laboratory, Florida State University , 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Lloyd Lumata
- Department of Physics, University of Texas at Dallas , 800 West Campbell Road, Richardson, Texas 75080 United States
| |
Collapse
|
8
|
Pan J, Sahoo PK, Dalzini A, Hayati Z, Aryal CM, Teng P, Cai J, Gutierrez HR, Song L. Membrane Disruption Mechanism of a Prion Peptide (106-126) Investigated by Atomic Force Microscopy, Raman and Electron Paramagnetic Resonance Spectroscopy. J Phys Chem B 2017; 121:5058-5071. [PMID: 28459565 PMCID: PMC5770145 DOI: 10.1021/acs.jpcb.7b02772] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A fragment of the human prion protein spanning residues 106-126 (PrP106-126) recapitulates many essential properties of the disease-causing protein such as amyloidogenicity and cytotoxicity. PrP106-126 has an amphipathic characteristic that resembles many antimicrobial peptides (AMPs). Therefore, the toxic effect of PrP106-126 could arise from a direct association of monomeric peptides with the membrane matrix. Several experimental approaches are employed to scrutinize the impacts of monomeric PrP106-126 on model lipid membranes. Porous defects in planar bilayers are observed by using solution atomic force microscopy. Adding cholesterol does not impede defect formation. A force spectroscopy experiment shows that PrP106-126 reduces Young's modulus of planar lipid bilayers. We use Raman microspectroscopy to study the effect of PrP106-126 on lipid atomic vibrational dynamics. For phosphatidylcholine lipids, PrP106-126 disorders the intrachain conformation, while the interchain interaction is not altered; for phosphatidylethanolamine lipids, PrP106-126 increases the interchain interaction, while the intrachain conformational order remains similar. We explain the observed differences by considering different modes of peptide insertion. Finally, electron paramagnetic resonance spectroscopy shows that PrP106-126 progressively decreases the orientational order of lipid acyl chains in magnetically aligned bicelles. Together, our experimental data support the proposition that monomeric PrP106-126 can disrupt lipid membranes by using similar mechanisms found in AMPs.
Collapse
Affiliation(s)
- Jianjun Pan
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Prasana K. Sahoo
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Annalisa Dalzini
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Chinta M. Aryal
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Peng Teng
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Jianfeng Cai
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | | | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| |
Collapse
|
9
|
Niedbalski P, Parish C, Kiswandhi A, Fidelino L, Khemtong C, Hayati Z, Song L, Martins A, Sherry AD, Lumata L. Influence of Dy 3+ and Tb 3+ doping on 13C dynamic nuclear polarization. J Chem Phys 2017; 146:014303. [PMID: 28063445 DOI: 10.1063/1.4973317] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Dynamic nuclear polarization (DNP) is a technique that uses a microwave-driven transfer of high spin alignment from electrons to nuclear spins. This is most effective at low temperature and high magnetic field, and with the invention of the dissolution method, the amplified nuclear magnetic resonance (NMR) signals in the frozen state in DNP can be harnessed in the liquid-state at physiologically acceptable temperature for in vitro and in vivo metabolic studies. A current optimization practice in dissolution DNP is to dope the sample with trace amounts of lanthanides such as Gd3+ or Ho3+, which further improves the polarization. While Gd3+ and Ho3+ have been optimized for use in dissolution DNP, other lanthanides have not been exhaustively studied for use in C13 DNP applications. In this work, two additional lanthanides with relatively high magnetic moments, Dy3+ and Tb3+, were extensively optimized and tested as doping additives for C13 DNP at 3.35 T and 1.2 K. We have found that both of these lanthanides are also beneficial additives, to a varying degree, for C13 DNP. The optimal concentrations of Dy3+ (1.5 mM) and Tb3+ (0.25 mM) for C13 DNP were found to be less than that of Gd3+ (2 mM). W-band electron paramagnetic resonance shows that these enhancements due to Dy3+ and Tb3+ doping are accompanied by shortening of electron T1 of trityl OX063 free radical. Furthermore, when dissolution was employed, Tb3+-doped samples were found to have similar liquid-state C13 NMR signal enhancements compared to samples doped with Gd3+, and both Tb3+ and Dy3+ had a negligible liquid-state nuclear T1 shortening effect which contrasts with the significant reduction in T1 when using Gd3+. Our results show that Dy3+ doping and Tb3+ doping have a beneficial impact on C13 DNP both in the solid and liquid states, and that Tb3+ in particular could be used as a potential alternative to Gd3+ in C13 dissolution DNP experiments.
Collapse
Affiliation(s)
- Peter Niedbalski
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | - Christopher Parish
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | - Andhika Kiswandhi
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| | - Leila Fidelino
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Chalermchai Khemtong
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Zahra Hayati
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - Likai Song
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - André Martins
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - A Dean Sherry
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA
| | - Lloyd Lumata
- Department of Physics, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
| |
Collapse
|
10
|
Hayati Z, Kaur P, Song L. Lipid Lateral Ordering Defined by High-Field EPR. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.447] [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
|
11
|
Song L, Sun ZYJ, Kim M, Kaur P, Hayati Z, ELBahnasawy MA, Wagner G, Reinherz EL. Protein-Lipid Interaction at the HIV Membrane Interface Defined by EPR Spectroscopy. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.1262] [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] Open
|
12
|
Shrestha R, Chen X, Ramyar KX, Hayati Z, Carlson EA, Bossmann SH, Song L, Geisbrecht BV, Li P. Identification of Surface-Exposed Protein Radicals and A Substrate Oxidation Site in A-Class Dye-Decolorizing Peroxidase from Thermomonospora curvata. ACS Catal 2016; 6:8036-8047. [PMID: 29308294 DOI: 10.1021/acscatal.6b01952] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dye-decolorizing peroxidases (DyPs) are a family of heme peroxidases, in which a catalytic distal aspartate is involved in H2O2 activation to catalyze oxidations in acidic conditions. They have received much attention due to their potential applications in lignin compound degradation and biofuel production from biomass. However, the mode of oxidation in bacterial DyPs remains unknown. We have recently reported that the bacterial TcDyP from Thermomonospora curvata is among the most active DyPs and shows activity toward phenolic lignin model compounds (J. Biol. Chem.2015, 290, 23447). Based on the X-ray crystal structure solved at 1.75 Å, sigmoidal steady-state kinetics with Reactive Blue 19 (RB19), and formation of compound II-like product in the absence of reducing substrates observed with stopped-flow spectroscopy and electron paramagnetic resonance (EPR), we hypothesized that the TcDyP catalyzes oxidation of large-size substrates via multiple surface-exposed protein radicals. Among 7 tryptophans and 3 tyrosines in TcDyP consisting of 376 residues for the matured protein, W263, W376, and Y332 were identified as surface-exposed protein radicals. Only the W263 was also characterized as one of surface-exposed oxidation sites. SDS-PAGE and size-exclusion chromatography demonstrated that W376 represents an off-pathway destination for electron transfer, resulting in the crosslinking of proteins in the absence of substrates. Mutation of W376 improved compound I stability and overall catalytic efficiency toward RB19. While Y332 is highly conserved across all four classes of DyPs, its catalytic function in A-class TcDyP is minimal possibly due to its extremely small solvent accessible areas. Identification of surface-exposed protein radicals and substrate oxidation sites is important for understanding DyP mechanism and modulating its catalytic functions for improved activity on phenolic lignin.
Collapse
Affiliation(s)
| | | | | | - Zahra Hayati
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | | | | | - Likai Song
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | | | | |
Collapse
|
13
|
Ahmadi-Motamayel F, Falsafi P, Hayati Z, Rezaei F, Poorolajal J. Prevalence of oral mucosal lesions in male smokers and nonsmokers. Chonnam Med J 2013; 49:65-8. [PMID: 24010068 PMCID: PMC3759684 DOI: 10.4068/cmj.2013.49.2.65] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 06/10/2013] [Accepted: 06/21/2013] [Indexed: 11/06/2022] Open
Abstract
Tobacco smoking is one of the most important risk factors for the development of oral mucosal lesions such as leukoplakia and hairy tongue. Controversy exists in the literature, however, about the prevalence of oral lesions in smokers. The aim of this study was to evaluate oral lesions in male smokers compared with nonsmokers in Hamadan. A total of 516 male participants were assessed, 258 of whom were smokers and 258 of whom were healthy nonsmokers. The prevalence of lesions was evaluated by clinical observation and biopsy. We found that the most prevalent lesions among smokers were gingival problems and coated tongue; smokers had significantly more lesions than did nonsmokers. Malignant and premalignant lesions were found in a higher age range. Among all participants in our study, we found a large number of oral mucosal lesions in smokers that had a strong correlation with smoking. Dental services need to implement care and health education for smokers to promote health.
Collapse
Affiliation(s)
- Fatemeh Ahmadi-Motamayel
- Dental Research Center, Department of Oral Medicine, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
| | | | | | | | | |
Collapse
|
14
|
Saghafinia M, Nafissi N, Motamedi MRK, Motamedi MHK, Hashemzade M, Hayati Z, Panahi F. Assessment and outcome of 496 penetrating gastrointestinal warfare injuries. J ROY ARMY MED CORPS 2011; 156:25-7. [PMID: 20433101 DOI: 10.1136/jramc-156-01-05] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIM The abdominal viscera are among the most vulnerable organs of the body to penetrating trauma. Proper management of such trauma in war victims at the first-line hospital where these victims are first seen is of paramount importance. We reviewed medical records of war victims suffering small bowel and colorectal injuries treated at first, second and third-line hospitals during the Iraq-Iran War (1980-88) to assess surgical outcomes. METHODS The medical records of 496 Iranian war victims suffering penetrating gastrointestinal (GI) injuries treated at first, second and third-line (tertiary) hospitals, a total of 19 centres, were reviewed. Laparotomy had been performed at the 1st line hospitals for all patients who had an acute abdomen, whose wounds violated the peritoneum or whose abdominal radiographs showed air or shrapnel in the abdominal cavity. Stable patients were transferred from first-line to second-line or from second line to tertiary hospitals postoperatively. The treatments, complications and patient outcomes were documented and analyzed. RESULTS There were 496 patients; 145, 220 and 131 victims underwent laparotomy for GI injuries at first, second and third-line hospitals respectively. The small intestine and colon respectively were the most prevalent abdominal organs damaged. Those first treated for GI injuries at front-line hospitals (145 victims) had more serious conditions and could not be transferred prior to surgery and presented a higher prevalence of complications and mortality. Overall mortality from GI surgery was 3.6% (18 patients). Eleven patients (7.5%) whose first GI operation was performed at frontline hospitals and 7 patients (3.2%) who underwent their first surgical operation at second-line hospitals died. The most common reason for these deaths was complications relating to the gastrointestinal operation such as anastomotic leak. Six missed injuries were seen at the frontline and one at second line hospitals. There were no deaths at the 3rd line hospitals. CONCLUSION Penetrating abdominal injuries were common in Iranian victims of war often causing multiple organ injuries. The colon and small intestine were the more commonly injured organs and carried the most postoperative complications. Mortality at 1st line hospitals was more than double that of 2nd line hospitals; the complication rate was also greater as was the number of missed injuries. Adherence to the standard surgical protocols, prompt evaluation, proper triage and management are factors which may lower patient morbidity and complications.
Collapse
Affiliation(s)
- M Saghafinia
- Trauma Research Center, Baqiyatallah Medical Sciences University (BMSU), Tehran, Iran
| | | | | | | | | | | | | |
Collapse
|
15
|
Motamedi MHK, Tabatabaie FA, Navi F, Shafeie HA, Fard BK, Hayati Z. Assessment of radiographic factors affecting surgical exposure and orthodontic alignment of impacted canines of the palate: A 15-year retrospective study. ACTA ACUST UNITED AC 2009; 107:772-5. [DOI: 10.1016/j.tripleo.2008.12.022] [Citation(s) in RCA: 25] [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] [Received: 09/24/2008] [Revised: 10/16/2008] [Accepted: 12/08/2008] [Indexed: 11/28/2022]
|