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Polanco EA, Opdam LV, Passerini L, Huber M, Bonnet S, Pandit A. An artificial metalloenzyme that can oxidize water photocatalytically: design, synthesis, and characterization. Chem Sci 2024; 15:3596-3609. [PMID: 38455019 PMCID: PMC10915814 DOI: 10.1039/d3sc05870k] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 01/29/2024] [Indexed: 03/09/2024] Open
Abstract
In nature, light-driven water oxidation (WO) catalysis is performed by photosystem II via the delicate interplay of different cofactors positioned in its protein scaffold. Artificial systems for homogeneous photocatalytic WO are based on small molecules that often have limited solubility in aqueous solutions. In this work, we alleviated this issue and present a cobalt-based WO-catalyst containing artificial metalloenzyme (ArM) that is active in light-driven, homogeneous WO catalysis in neutral-pH aqueous solutions. A haem-containing electron transfer protein, cytochrome B5 (CB5), served to host a first-row transition-metal-based WO catalyst, CoSalen (CoIISalen, where H2Salen = N,N'-bis(salicylidene)ethylenediamine), thus producing an ArM capable of driving photocatalytic WO. The CoSalen ArM formed a water-soluble pre-catalyst in the presence of [Ru(bpy)3](ClO4)2 as photosensitizer and Na2S2O8 as the sacrificial electron acceptor, with photocatalytic activity similar to that of free CoSalen. During photocatalysis, the CoSalen-protein interactions were destabilized, and the protein partially unfolded. Rather than forming tens of nanometer sized CoOx nanoparticles as free CoSalen does under photocatalytic WO conditions, the CB5 : CoSalen ArM showed limited protein cross-linking and remained soluble. We conclude that a weak, dynamic interaction between a soluble cobalt species and apoCB5 was formed, which generated a catalytically active adduct during photocatalysis. A detailed analysis was performed on protein stability and decomposition processes during the harsh oxidizing reaction conditions of WO, which will serve for the future design of WO ArMs with improved activity and stability.
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Affiliation(s)
- Ehider A Polanco
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Laura V Opdam
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Leonardo Passerini
- Department of Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden University Niels Bohrweg 2 2333 CA Leiden The Netherlands
| | - Martina Huber
- Department of Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden University Niels Bohrweg 2 2333 CA Leiden The Netherlands
| | - Sylvestre Bonnet
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Anjali Pandit
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
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Dhungana S, Pathak N, Basyal B, Sah AK, Pandit A, Kunwor P, Karki R. Pediatric oncology services in Nepal: A special focus on pharmacy practice. J Oncol Pharm Pract 2024; 30:425-435. [PMID: 38321882 DOI: 10.1177/10781552241230631] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
The role of clinical pharmacists or oncology pharmacists in pediatric oncology has been established as important in anticancer regimen review, dose calculation, recommendation, chemocounseling, identification of drug-related problems, its resolution, and, prevention and monitoring of adverse drug reactions within high-income countries. With several hospitals providing pediatric oncology services in Nepal, clinical pharmacist involvement in these hospitals is very poor. Upon reviewing the reputed organization and association focused on pediatric oncology pharmacy practice, it looks imperative for Nepal to initiate clinical pharmacy services which will further help in improving patient health outcomes. As such in this commentary, we try to accentuate the pediatric oncology services and pediatric pharmacy practice within Nepal and try to pinpoint the potential areas for clinical pharmacists to focus if they intend to provide services in pediatric oncology pharmacy practice.
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Affiliation(s)
- Shreya Dhungana
- National Model College for Advanced Learning, Tribhuvan University, Kirtipur, Kathmandu, Nepal
| | - Nabin Pathak
- Pharmaceutical Sciences Program, School of Health and Allied Sciences, Faculty of Health Sciences, Pokhara University, Lekhnath, Gandaki, Nepal
| | - Bijaya Basyal
- Pharmaceutical Sciences Program, School of Health and Allied Sciences, Faculty of Health Sciences, Pokhara University, Lekhnath, Gandaki, Nepal
| | - Aman Kumar Sah
- Pharmaceutical Sciences Program, School of Health and Allied Sciences, Faculty of Health Sciences, Pokhara University, Lekhnath, Gandaki, Nepal
| | - Anjali Pandit
- Department of Pediatric Hematology-Oncology, Nepal Cancer Hospital and Research Center, Harisiddhi, Lalitpur, Nepal
| | - Puskar Kunwor
- Department of Clinical Pharmacy, Nepal Cancer Hospital and Research Center, Harisiddhi, Lalitpur, Nepal
| | - Renu Karki
- Pharmaceutical Sciences Program, School of Health and Allied Sciences, Faculty of Health Sciences, Pokhara University, Lekhnath, Gandaki, Nepal
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Marulanda Valencia W, Pandit A. Photosystem II Subunit S (PsbS): A Nano Regulator of Plant Photosynthesis. J Mol Biol 2024; 436:168407. [PMID: 38109993 DOI: 10.1016/j.jmb.2023.168407] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/26/2023] [Accepted: 12/13/2023] [Indexed: 12/20/2023]
Abstract
Light is required for photosynthesis, but plants are often exposed to excess light, which can lead to photodamage and eventually cell death. To prevent this, they evolved photoprotective feedback mechanisms that regulate photosynthesis and trigger processes that dissipate light energy as heat, called non-photochemical quenching (NPQ). In excess light conditions, the light reaction and activity of Photosystem II (PSII) generates acidification of the thylakoid lumen, which is sensed by special pH-sensitive proteins called Photosystem II Subunit S (PsbS), actuating a photoprotective "switch" in the light-harvesting antenna. Despite its central role in regulating photosynthetic energy conversion, the molecular mechanism of PsbS as well as its interaction with partner proteins are not well understood. This review summarizes the current knowledge on the molecular structure and mechanistic aspects of the light-stress sensor PsbS and addresses open questions and challenges in the field regarding a full understanding of its functional mechanism and role in NPQ.
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Affiliation(s)
| | - Anjali Pandit
- Leiden Inst. of Chemistry, Gorlaeus Laboratory, Einsteinweg 55, 2300 RA Leiden, The Netherlands.
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Aswani-Omprakash T, Balasubramaniam M, McGarva J, Pandit A, Mutlu EA, Hanauer SB, Taft TH. Post-traumatic stress disorder symptoms are frequent among inflammatory bowel disease patients of South Asian descent-A case-control study. Indian J Gastroenterol 2024; 43:244-253. [PMID: 37823984 DOI: 10.1007/s12664-023-01424-x] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 06/27/2023] [Indexed: 10/13/2023]
Abstract
BACKGROUND Post-traumatic stress (PTS) is the psycho-physiological response to a traumatic or life-threatening event and is implicated in inflammatory bowel disease (IBD). IBD-PTS is present in up to 30% of white, non-Hispanic patients. The rates of IBD in Asian populations are expanding, making the exploration of IBD-PTS in this population imperative. METHODS Adult patients of South/Southeast (S/SE) Asian decent with IBD for more than 6 months were recruited online via social media and patient-support groups. Participants completed the post-traumatic stress disorder (PTSD) Checklist-5 (PCL-5), the United States National Institutes of Health's Patient-Reported Outcomes Measurement Information System (NIH-PROMIS) -43 profile and demographics. S/SE Asian participants were age and sex matched (1:2) with randomly selected white, non-Hispanic controls. Statistical analyses evaluated differences in IBD-PTS symptoms between groups, the relationship between disease severity and health-related quality of life (HRQoL) and predictors of IBD-PTS severity. RESULTS Forty-seven per cent of the 51 S/SE Asian participants met the diagnostic cut-off for PTSD on the PCL-5 compared to 13.6% of 110 IBD controls. The mean global score on the PCL-5 was three times higher in S/SE Asians. Patients of S/SE Asian decent were over five times more likely to have PTSD due to their IBD experiences than controls, nearly doubling when controlling for disease activity. More severe IBD-PTS was present in S/SE Asian patients with active disease and those with extraintestinal manifestations. Higher global levels of IBD-PTS were associated with poorer HRQoL in S/SE Asians where increased hyperarousal from IBD-PTS predicted more sleep disturbance. CONCLUSIONS S/SE Asian patients are five times more likely to experience IBD-PTS than their white, non-Hispanic counterparts. Several cultural factors lead to IBD-PTS in S/SE Asian patients that must be considered by IBD providers. Preventing, screening for and treating IBD-PTS in this population appears warranted.
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Affiliation(s)
- Tina Aswani-Omprakash
- Mount Sinai Icahn School of Medicine, School of Public Health, New York, NY, USA
- South Asian IBD Alliance, New York, NY, USA
| | - Madhura Balasubramaniam
- South Asian IBD Alliance, New York, NY, USA
- Department of Humanities and Social Sciences, Indian Institute of Technology, Madras, Chennai, 600 036, India
| | - Josie McGarva
- Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, 676 N Saint Clair Street, Suite 1400, Chicago, IL, 60611, USA
| | - Anjali Pandit
- South Asian IBD Alliance, New York, NY, USA
- Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, 676 N Saint Clair Street, Suite 1400, Chicago, IL, 60611, USA
| | - Ece A Mutlu
- Department of Medicine, Division of Gastroenterology and Hepatology, University of Illinois College of Medicine, Chicago, IL, USA
- Rush University, The Graduate College, Chicago, IL, USA
| | - Stephen B Hanauer
- Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, 676 N Saint Clair Street, Suite 1400, Chicago, IL, 60611, USA
| | - Tiffany H Taft
- Division of Gastroenterology and Hepatology, Northwestern University Feinberg School of Medicine, 676 N Saint Clair Street, Suite 1400, Chicago, IL, 60611, USA.
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Srivastava S, Basak U, Naghibi M, Vijayakumar V, Parihar R, Patel J, Jadon PS, Pandit A, Dargad RR, Khanna S, Kumar S, Day R. A randomized double-blind, placebo-controlled trial to evaluate the safety and efficacy of live Bifidobacterium longum CECT 7347 (ES1) and heat-treated Bifidobacterium longum CECT 7347 (HT-ES1) in participants with diarrhea-predominant irritable bowel syndrome. Gut Microbes 2024; 16:2338322. [PMID: 38630015 PMCID: PMC11028008 DOI: 10.1080/19490976.2024.2338322] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/29/2024] [Indexed: 04/19/2024] Open
Abstract
To determine the efficacy of the probiotic Bifidobacterium longum CECT 7347 (ES1) and postbiotic heat-treated Bifidobacterium longum CECT 7347 (HT-ES1) in improving symptom severity in adults with diarrhea-predominant irritable bowel syndrome (IBS-D), a randomised, double-blind, placebo-controlled trial with 200 participants split into three groups was carried out. Two capsules of either ES1, HT-ES1 or placebo were administered orally, once daily, for 84 days (12 weeks). The primary outcome was change in total IBS-Symptom Severity Scale (IBS-SSS) score from baseline, compared to placebo. Secondary outcome measures were stool consistency, quality of life, abdominal pain severity and anxiety scores. Safety parameters and adverse events were also monitored. The change in IBS-SSS scores from baseline compared to placebo, reached significance in the ES1 and HT-ES1 group, on Days 28, 56 and 84. The decrease in mean IBS-SSS score from baseline to Day 84 was: ES1 (-173.70 [±75.60]) vs placebo (-60.44 [±65.5]) (p < .0001) and HT-ES1 (-177.60 [±79.32]) vs placebo (-60.44 [±65.5]) (p < .0001). Secondary outcomes included changes in IBS-QoL, APS-NRS, stool consistency and STAI-S and STAI-T scores, with changes from baseline to Day 84 being significant in ES1 and HT-ES1 groups, compared to the placebo group. Both ES1 and HT-ES1 were effective in reducing IBS-D symptom severity, as evaluated by measures such as IBS-SSS, IBS-QoL, APS-NRS, stool consistency, and STAI, in comparison to the placebo. These results are both statistically significant and clinically meaningful, representing, to the best of the authors' knowledge, the first positive results observed for either a probiotic or postbiotic from the same strain, in this particular population.
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Affiliation(s)
- S Srivastava
- Clinical Development & Science Communications, Vedic Lifesciences Pvt Ltd, Mumbai, India
| | - U Basak
- Clinical Development & Science Communications, Vedic Lifesciences Pvt Ltd, Mumbai, India
| | - M Naghibi
- Medical Department, ADM Health & Wellness, London, UK
| | - V Vijayakumar
- Medical Department, ADM Health & Wellness, London, UK
| | - R Parihar
- Gastroenterology Department, Gastroplus Digestive Disease Centre, Ahmedabad, India
| | - J Patel
- Gastroenterology Department, Apex Gastro Clinic and Hospital, Ahmedabad, India
| | - PS Jadon
- Medicine Department, Jaipur National University Institute for Medical Science & Research Centre, Jaipur, India
| | - A Pandit
- General Surgery Department, United Multispeciality Hospital, Maharashtra, India
| | - RR Dargad
- Medicine Department, Lilavati Hospital & Research Centre, Maharashtra, India
| | - S Khanna
- Gastroenterology Department, Criticare Asia Multispeciality hospital, Maharashtra, India
| | - S Kumar
- Independent Biostatistical Consultant, Delhi, India
| | - R Day
- Medical Department, ADM Health & Wellness, London, UK
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Shrestha AL, Shrestha P, Mishra A, Pandit A. A cystic non-Wilms renal tumor in a Nepalese boy: A rare case of clear cell sarcoma. Int J Surg Case Rep 2023; 109:108582. [PMID: 37517259 PMCID: PMC10400875 DOI: 10.1016/j.ijscr.2023.108582] [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: 07/11/2023] [Revised: 07/22/2023] [Accepted: 07/24/2023] [Indexed: 08/01/2023] Open
Abstract
INTRODUCTION Clear cell sarcoma of the kidney (CCSK) is an uncommon childhood malignancy known for its aggressive behavior and tendency to recur and metastasize to the brain and bones. CASE PRESENTATION We report a four-year-old boy evaluated for non-specific abdominal pain with an incidental radiological finding of a right lower pole cystic renal mass initially thought to be cystic Wilms' tumor. A pretherapy core biopsy of the mass suggested a clear cell tumor. An open transperitoneal radical nephroureterectomy with aortocaval lymph node sampling was done. Based on histopathological findings and immunohistochemical analysis, CCSK was diagnosed. Appropriate chemotherapy and radiotherapy were instituted postoperatively. At six years follow-up, he was tumor-free and doing well. CLINICAL DISCUSSION The workup for CCSK includes diagnostic and metastatic imaging, histopathology, and immunohistochemistry analysis. Diagnostic segregation of CCSK and Wilms' tumor is imperative to institute optimal oncological management and improve overall treatment outcomes. CONCLUSION Considering the age of presentation and clinico-radiological appearance, CCSK can be mistaken for Wilms' tumor, which is much more common in occurrence despite the distinguishable histopathological features, treatment modalities, and prognosis.
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Affiliation(s)
- Ashish Lal Shrestha
- Department of Pediatric and Neonatal Surgery, Kathmandu Medical College Teaching Hospital, Kathmandu, Nepal
| | - Prinsa Shrestha
- Kathmandu Medical College Teaching Hospital, Kathmandu, Nepal
| | - Aakash Mishra
- Kathmandu Medical College Teaching Hospital, Kathmandu, Nepal.
| | - Anjali Pandit
- Department of Medical Oncology, Nepal Cancer Hospital and Research Center, Lalitpur, Nepal
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Pandit A, Shukla AK, Deepika, Vaidya D, Kumari A, Kumar A. In vitro Assessment of Anti-Microbial Activity of Aloe vera (Barbadensis miller) Supported through Computational Studies. Russ J Bioorg Chem 2023. [DOI: 10.1134/s1068162023020188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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Sirohiya P, Raju Sagiraju H, Baruah M, Singh R, Elavarasi A, Vig S, Ratre B, Kumar B, Pandit A, Bhatnagar S. 428P Clinical characteristics, laboratory parameters, and hospital outcomes of COVID-19 among patients with and without cancer: A retrospective cohort study. Ann Oncol 2022. [PMCID: PMC9719678 DOI: 10.1016/j.annonc.2022.10.459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
Affiliation(s)
- P. Sirohiya
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - H.K. Raju Sagiraju
- Preventive Oncology, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - M. Baruah
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - R. Singh
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - A. Elavarasi
- Neurology, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - S. Vig
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - B.K. Ratre
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - B. Kumar
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - A. Pandit
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
| | - S. Bhatnagar
- Onco-Anaesthesia and Palliative Medicine, AIIMS - All India Institute of Medical Sciences, New Delhi, India
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Taft TH, McGarva J, Omprakash TA, Tomasino K, Pandit A, Mutlu EA, Hanauer SB. Hospitalization Experiences and Post-traumatic Stress in Inflammatory Bowel Disease: Opportunities for Change. Inflamm Bowel Dis 2022; 29:675-683. [PMID: 35894686 DOI: 10.1093/ibd/izac148] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Indexed: 12/09/2022]
Abstract
INTRODUCTION Medical trauma related to IBD (IBD-PTS) affects approximately 25% of patients and is associated with poor outcomes. Prior studies identify common hospitalization experiences as potentially traumatic but have not measured risk relationships for the development of IBD-PTS. We aim to investigate what aspects of hospitalizations may increase the chance of medical trauma and IBD-PTS development. METHODS Adult patients with IBD enrolled in the IBD Partners database were recruited. Study specific questionnaires included PTSD checklist, 5th edition (PCL-5), patient experience questionnaire, and items about the patient's most stressful hospitalization and nonhospital sources of medical trauma. Established criteria for the PCL-5 identified significant IBD-PTS symptoms (re-experiencing, avoidance, mood change, hyperarousal, global diagnosis). Select disease and treatment information was obtained from the main IBD Partners dataset. Univariate and multivariate statistics evaluated the relationships between hospitalization data and IBD-PTS. RESULTS There were 639 participants with at least 1 hospitalization for IBD included. Approximately two-thirds had Crohn's disease; most were White, non-Hispanic, female, middle-aged, and reported their IBD as being in remission. Forty percent of patients stated a hospitalization was a source of IBD-PTS. Frequent anxiety while hospitalized increased the odds of IBD-PTS 2 to 4 times; similar relationships existed for pain/pain control. Higher quality communication, information, and listening skills reduced the odds of IBD-PTS, albeit marginally. CONCLUSIONS Patients with IBD consistently cite hospitalizations as potential sources of medical trauma. Poorly managed anxiety and pain demonstrate the greatest chance for IBD-PTS development. Gender and racial/ethnic differences emerged for these risks. Positive interactions with the medical team may help mitigate in-hospital IBD-PTS development.
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Affiliation(s)
- Tiffany H Taft
- Northwestern University Feinberg School of Medicine, Division of Gastroenterology & Hepatology, Chicago, Illinois, USA
| | - Josie McGarva
- Northwestern University Feinberg School of Medicine, Division of Gastroenterology & Hepatology, Chicago, Illinois, USA
| | | | - Kathryn Tomasino
- Northwestern University Feinberg School of Medicine, Division of Gastroenterology & Hepatology, Chicago, Illinois, USA
| | - Anjali Pandit
- Northwestern University Feinberg School of Medicine, Division of Gastroenterology & Hepatology, Chicago, Illinois, USA
| | - Ece A Mutlu
- University of Illinois, Division of Gastroenterology, Chicago, Illinois, USA
| | - Stephen B Hanauer
- Northwestern University Feinberg School of Medicine, Division of Gastroenterology & Hepatology, Chicago, Illinois, USA
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Opdam LV, Polanco EA, de Regt B, Lambertina N, Bakker C, Bonnet S, Pandit A. A screening method for binding synthetic metallo-complexes to haem proteins. Anal Biochem 2022; 653:114788. [PMID: 35732212 DOI: 10.1016/j.ab.2022.114788] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 06/08/2022] [Accepted: 06/11/2022] [Indexed: 11/17/2022]
Abstract
The introduction of a second coordination sphere, in the form of a protein scaffold, to synthetic catalysts can be beneficial for their reactivity and substrate selectivity. Here we present semi-native polyacrylamide gel electrophoresis (semi-native PAGE) as a rapid screening method for studying metal complex-protein interactions. Such a screening is generally performed using electron spray ionization mass spectrometry (ESI-MS) and/or UV-Vis spectroscopy. Semi-native PAGE analysis has the advantage that it does not rely on spectral changes of the metal complex upon protein interaction and can be applied for high-throughput screening and optimization of complex binding. In semi-native PAGE non-denatured protein samples are loaded on a gel containing sodium dodecyl sulphate (SDS), leading to separation based on differences in structural stability. Semi-native PAGE gel runs of catalyst-protein mixtures were compared to gel runs obtained with native and denaturing PAGE. ESI-MS was additionally realised to confirm protein-complex binding. The general applicability of semi-native PAGE was investigated by screening the binding of various cobalt- and ruthenium-based compounds to three types of haem proteins.
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Affiliation(s)
- Laura V Opdam
- SSNMR/BPOC, Einsteinweg 55, 2333 CC, Leiden, the Netherlands
| | - Ehider A Polanco
- MCBIM Departments, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, the Netherlands
| | - Boyd de Regt
- SSNMR/BPOC, Einsteinweg 55, 2333 CC, Leiden, the Netherlands
| | | | - Cas Bakker
- SSNMR/BPOC, Einsteinweg 55, 2333 CC, Leiden, the Netherlands
| | - Sylvestre Bonnet
- MCBIM Departments, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, the Netherlands
| | - Anjali Pandit
- SSNMR/BPOC, Einsteinweg 55, 2333 CC, Leiden, the Netherlands.
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Pandit A. Structural dynamics of light harvesting proteins, photosynthetic membranes and cells observed with spectral editing solid-state NMR. J Chem Phys 2022; 157:025101. [DOI: 10.1063/5.0094446] [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: 11/14/2022] Open
Abstract
Photosynthetic light-harvesting complexes have a remarkable capacity to perform robust photo physics at ambient temperatures and in fluctuating environments. Protein conformational dynamics and membrane mobility are processes that contribute to the light-harvesting efficiencies and control photoprotective responses. This short review describes the application of Magic Angle Spinning (MAS) NMR spectroscopy for characterizing the structural dynamics of pigment, protein and thylakoid membrane components related to light harvesting and photoprotection. I will discuss the use of dynamics-based spectral editing solid-state NMR for distinguishing rigid and mobile components and assessing protein, pigment and lipid dynamics on sub-nanosecond to millisecond timescales. Dynamic spectral editing NMR has been applied to investigate Light-Harvesting Complex II (LHCII) protein conformational dynamics inside lipid bilayers and in native membranes. Furthermore, we used the NMR approach to assess thylakoid membrane dynamics. Finally, it is shown that dynamics-based spectral editing NMR, for reducing spectral complexity, by filtering motion-dependent signals, enabled us to follow processes in live photosynthetic cells.
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Walton A, Pandit A, Payakachat N, Mundinger G, Raheem O, Benson C. Perioperative Morbidity of Feminizing Gender Affirmation Surgery: Analysis of the National Surgical Quality Improvement Program (NSQIP) Database. J Sex Med 2022. [DOI: 10.1016/j.jsxm.2022.01.194] [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: 11/26/2022]
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Nami F, Ferraz MJ, Bakkum T, Aerts JMFG, Pandit A. Real‐Time NMR Recording of Fermentation and Lipid Metabolism Processes in Live Microalgae Cells. Angew Chem Int Ed Engl 2022; 61:e202117521. [PMID: 35103372 PMCID: PMC9305762 DOI: 10.1002/anie.202117521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 01/07/2022] [Indexed: 11/10/2022]
Abstract
Non‐invasive and real‐time recording of processes in living cells has been limited to detection of small cellular components such as soluble proteins and metabolites. Here we report a multiphase NMR approach using magic‐angle spinning NMR to synchronously follow microbial processes of fermentation, lipid metabolism and structural dynamic changes in live microalgae cells. Chlamydomonas reinhardtii green algae were highly concentrated, introducing dark fermentation and anoxia conditions. Single‐pulse NMR experiments were applied to obtain temperature‐dependent kinetic profiles of the formed fermentation products. Through dynamics‐based spectral editing NMR, simultaneous conversion of galactolipids into TAG and free fatty acids was observed and rapid loss of rigid lipid structures. This suggests that lipolysis under dark and anoxia conditions finally results in the breakdown of cell and organelle membranes, which could be beneficial for recovery of intracellular microbial useful products.
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Affiliation(s)
- Faezeh Nami
- Dept. of Solid-State NMR Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Maria Joao Ferraz
- Dept. of Medicinal Biochemistry Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Thomas Bakkum
- Dept. of Bio Organic Synthesis Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Johannes M. F. G. Aerts
- Dept. of Medicinal Biochemistry Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Anjali Pandit
- Dept. of Solid-State NMR Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
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Nami F, Ferraz MJ, Bakkum T, Aerts JMFG, Pandit A. Real‐Time NMR Recording of Fermentation and Lipid Metabolism Processes in Live Microalgae Cells. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Faezeh Nami
- Dept. of Solid-State NMR Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Maria Joao Ferraz
- Dept. of Medicinal Biochemistry Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Thomas Bakkum
- Dept. of Bio Organic Synthesis Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Johannes M. F. G. Aerts
- Dept. of Medicinal Biochemistry Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Anjali Pandit
- Dept. of Solid-State NMR Leiden Institute of Chemistry Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
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15
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Azadi-Chegeni F, Thallmair S, Ward ME, Perin G, Marrink SJ, Baldus M, Morosinotto T, Pandit A. Protein dynamics and lipid affinity of monomeric, zeaxanthin-binding LHCII in thylakoid membranes. Biophys J 2022; 121:396-409. [PMID: 34971616 PMCID: PMC8822613 DOI: 10.1016/j.bpj.2021.12.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 12/02/2021] [Accepted: 12/23/2021] [Indexed: 02/03/2023] Open
Abstract
The xanthophyll cycle in the antenna of photosynthetic organisms under light stress is one of the most well-known processes in photosynthesis, but its role is not well understood. In the xanthophyll cycle, violaxanthin (Vio) is reversibly transformed to zeaxanthin (Zea) that occupies Vio binding sites of light-harvesting antenna proteins. Higher monomer/trimer ratios of the most abundant light-harvesting protein, the light-harvesting complex II (LHCII), usually occur in Zea accumulating membranes and have been observed in plants after prolonged illumination and during high-light acclimation. We present a combined NMR and coarse-grained simulation study on monomeric LHCII from the npq2 mutant that constitutively binds Zea in the Vio binding pocket. LHCII was isolated from 13C-enriched npq2 Chlamydomonas reinhardtii (Cr) cells and reconstituted in thylakoid lipid membranes. NMR results reveal selective changes in the fold and dynamics of npq2 LHCII compared with the trimeric, wild-type and show that npq2 LHCII contains multiple mono- or digalactosyl diacylglycerol lipids (MGDG and DGDG) that are strongly protein bound. Coarse-grained simulations on npq2 LHCII embedded in a thylakoid lipid membrane agree with these observations. The simulations show that LHCII monomers have more extensive lipid contacts than LHCII trimers and that protein-lipid contacts are influenced by Zea. We propose that both monomerization and Zea binding could have a functional role in modulating membrane fluidity and influence the aggregation and conformational dynamics of LHCII with a likely impact on photoprotection ability.
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Affiliation(s)
- Fatemeh Azadi-Chegeni
- Leiden Institute of Chemistry, Department of Solid-State NMR, Leiden University, Leiden, the Netherlands
| | - Sebastian Thallmair
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands; Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany
| | - Meaghan E Ward
- NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, the Netherlands
| | - Giorgio Perin
- Department of Biology, University of Padua, Padua, Italy
| | - Siewert J Marrink
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands
| | - Marc Baldus
- NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Utrecht, the Netherlands
| | | | - Anjali Pandit
- Leiden Institute of Chemistry, Department of Solid-State NMR, Leiden University, Leiden, the Netherlands.
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16
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Kumawat TK, Kumawat V, Sharma S, Sharma V, Pandit A, Kandwani N, Biyani M. Sustainable Green Methods for the Extraction of Biopolymers. Biopolymers 2022. [DOI: 10.1007/978-3-030-98392-5_5] [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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17
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Affiliation(s)
- C Yerawar
- Department of Endocrinology, Shree Narayana Institute of Medical Superspeciality, Nanded, Maharashtra, 431602, India
| | - D Punde
- Department of medicine, Punde Hospital, Mukhed, Nanded, Maharashtra, 431715, India
| | - A Pandit
- Department of Endocrinology, Shree Narayana Institute of Medical Superspeciality, Nanded, Maharashtra, 431602, India
| | - P Deokar
- Department of Biochemistry, Shree Narayana Institute of Medical Superspeciality, Nanded, Maharashtra, 431602, India
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18
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Pandit A, Khare L, Ganatra P, Jain R, Dandekar P. Intriguing role of novel ionic liquids in stochastic degradation of chitosan. Carbohydr Polym 2021; 260:117828. [PMID: 33712168 DOI: 10.1016/j.carbpol.2021.117828] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 02/04/2021] [Accepted: 02/11/2021] [Indexed: 10/22/2022]
Abstract
Green technique for hydrolysis of chitosan was developed using novel Brønsted Acidic Ionic Liquids (BAILs) as homogenous reusable catalysts. Efficiency of BAILs in controlling stochastic and irregular breakdown of chitosan was compared with that of mineral acids. Structural elucidation of the novel BAILs was performed using H1-NMR evaluation and supplemented using mass spectroscopy. Additionally, thermal characterization was conducted using TGA-DTA analysis, while acidity was estimated by deriving the Hammet acidity function. BAILs investigated in this work enabled consistent production of LMWCS variants, with minimum formation of residual impurities. Around 80 % reduction in molecular weight was noted as compared to original under extreme conditions employed. Further, Box-Behnken Design (BBD) was implemented to optimize effect of processing parameters for conversion of chitosan to low molecular weight congeners.
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Affiliation(s)
- A Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - L Khare
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - P Ganatra
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - R Jain
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai -19, India
| | - P Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India.
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19
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Krishnan-Schmieden M, Konold PE, Kennis JTM, Pandit A. The molecular pH-response mechanism of the plant light-stress sensor PsbS. Nat Commun 2021; 12:2291. [PMID: 33863895 PMCID: PMC8052336 DOI: 10.1038/s41467-021-22530-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 03/12/2021] [Indexed: 11/12/2022] Open
Abstract
Plants need to protect themselves from excess light, which causes photo-oxidative damage and lowers the efficiency of photosynthesis. Photosystem II subunit S (PsbS) is a pH sensor protein that plays a crucial role in plant photoprotection by detecting thylakoid lumen acidification in excess light conditions via two lumen-faced glutamates. However, how PsbS is activated under low-pH conditions is unknown. To reveal the molecular response of PsbS to low pH, here we perform an NMR, FTIR and 2DIR spectroscopic analysis of Physcomitrella patens PsbS and of the E176Q mutant in which an active glutamate has been replaced. The PsbS response mechanism at low pH involves the concerted action of repositioning of a short amphipathic helix containing E176 facing the lumen and folding of the luminal loop fragment adjacent to E71 to a 310-helix, providing clear evidence of a conformational pH switch. We propose that this concerted mechanism is a shared motif of proteins of the light-harvesting family that may control thylakoid inter-protein interactions driving photoregulatory responses.
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Affiliation(s)
| | - Patrick E Konold
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands
| | - John T M Kennis
- Department of Physics and Astronomy, Faculty of Sciences, Vrije Universiteit, Amsterdam, The Netherlands.
| | - Anjali Pandit
- Dept. of Solid-State NMR, Leiden Inst. of Chemistry, Leiden University, Leiden, The Netherlands.
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20
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Joyce K, Mohd Isa IL, Krouwels A, Creemers L, Devitt A, Pandit A. The role of altered glycosylation in human nucleus pulposus cells in inflammation and degeneration. Eur Cell Mater 2021; 41:401-420. [PMID: 33774812 DOI: 10.22203/ecm.v041a26] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Intervertebral disc (IVD) degeneration causes low-back pain through disc compression, prolapse and herniation. Inflammation of the IVD and subsequent degeneration produce altered glycosylation profiles in several animal models of IVD injury and ageing, although the function of this altered glycosylation pattern in a human is unknown. Altered N-glycome, specifically sialylated and fucosylated N-glycosylation motif expression, might play a role in inflammation and disease progression. Healthy (foetal and adolescent idiopathic scoliosis) and degenerated (lumbar degeneration) human IVD glycosylation patterns were studied using lectin histochemistry. Small-molecule fluorinated sugar analogues (3Fax-Peracetyl Neu5Ac; 2F-Peracetyl-Fucose) were used to inhibit sialylation and fucosylation in an in vitro model of inflammation, to investigate their effects on the glycosignature, cell metabolism, extracellular matrix synthesis and cell migration. The effects of interleukin (IL)-1β, tumour necrosis factor (TNF)-α and IL-6 on glycosylation in human nucleus pulposus cells were investigated by lectin histochemistry, PCR and enzyme-linked immunosorbent assay (ELISA). In the in vitro model of IVD degeneration, cytokine-induced inflammation-induced hypersialylation was observed, as indicated by Sambucus nigra I binding. However, this modification was inhibited by the sialyltransferase inhibitor. Inhibition of sialylation and fucosylation modulates cell migration and protein translation of catabolic enzymes in response to inflammation. The altered patterns of glycosylation in human tissue in degeneration was consistent with previous IVD studies in murine, bovine and ovine models. The present study was the first functional investigation of glycosylation in human degenerated IVD, elucidating the role of the glycome in disease progression and identified potential therapeutic targets for future regenerative therapies.
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Affiliation(s)
| | | | | | | | | | - A Pandit
- CÚRAM, SFI Research Centre for Medical Devices, National University of Ireland, Galway,
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21
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Nami F, Tian L, Huber M, Croce R, Pandit A. Lipid and protein dynamics of stacked and cation-depletion induced unstacked thylakoid membranes. BBA Advances 2021; 1:100015. [PMID: 37082020 PMCID: PMC10074959 DOI: 10.1016/j.bbadva.2021.100015] [Citation(s) in RCA: 6] [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: 01/08/2023] Open
Abstract
Chloroplast thylakoid membranes in plants and green algae form 3D architectures of stacked granal membranes interconnected by unstacked stroma lamellae. They undergo dynamic structural changes as a response to changing light conditions that involve grana unstacking and lateral supramolecular reorganization of the integral membrane protein complexes. We assessed the dynamics of thylakoid membrane components and addressed how they are affected by thylakoid unstacking, which has consequences for protein mobility and the diffusion of small electron carriers. By a combined nuclear and electron paramagnetic-resonance approach the dynamics of thylakoid lipids was assessed in stacked and cation-depletion induced unstacked thylakoids of Chlamydomonas (C.) reinhardtii. We could distinguish between structural, bulk and annular lipids and determine membrane fluidity at two membrane depths: close to the lipid headgroups and in the lipid bilayer center. Thylakoid unstacking significantly increased the dynamics of bulk and annular lipids in both areas and increased the dynamics of protein helices. The unstacking process was associated with membrane reorganization and loss of long-range ordered Photosystem II- Light-Harvesting Complex II (PSII-LHCII) complexes. The fluorescence lifetime characteristics associated with membrane unstacking are similar to those associated with state transitions in intact C. reinhardtii cells. Our findings could be relevant for understanding the structural and functional implications of thylakoid unstacking that is suggested to take place during several light-induced processes, such as state transitions, photoacclimation, photoinhibition and PSII repair.
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Affiliation(s)
- Faezeh Nami
- Institute of Chemistry, Leiden University, 2333 CC, Leiden, The Netherlands
| | - Lijin Tian
- Institute of Chemistry, Leiden University, 2333 CC, Leiden, The Netherlands
| | - Martina Huber
- Department of Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden University, 2300 RA, Leiden, The Netherlands
| | - Roberta Croce
- Department of Physics and Astronomy, VU University Amsterdam, 1081 HV, Amsterdam, The Netherlands
| | - Anjali Pandit
- Institute of Chemistry, Leiden University, 2333 CC, Leiden, The Netherlands
- Corresponding author:
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22
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Servaas NH, Zaaraoui-Boutahar F, Wichers CGK, Ottria A, Chouri E, Affandi AJ, Silva-Cardoso S, van der Kroef M, Carvalheiro T, van Wijk F, Radstake TRDJ, Andeweg AC, Pandit A. Longitudinal analysis of T-cell receptor repertoires reveals persistence of antigen-driven CD4 + and CD8 + T-cell clusters in systemic sclerosis. J Autoimmun 2020; 117:102574. [PMID: 33307312 DOI: 10.1016/j.jaut.2020.102574] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 09/08/2020] [Revised: 11/10/2020] [Accepted: 11/13/2020] [Indexed: 12/11/2022]
Abstract
The T-cell receptor (TCR) is a highly polymorphic surface receptor that allows T-cells to recognize antigenic peptides presented on the major histocompatibility complex (MHC). Changes in the TCR repertoire have been observed in several autoimmune conditions, and these changes are suggested to predispose autoimmunity. Multiple lines of evidence have implied an important role for T-cells in the pathogenesis of Systemic Sclerosis (SSc), a complex autoimmune disease. One of the major questions regarding the roles of T-cells is whether expansion and activation of T-cells observed in the diseases pathogenesis is antigen driven. To investigate the temporal TCR repertoire dynamics in SSc, we performed high-throughput sequencing of CD4+ and CD8+ TCRβ chains on longitudinal samples obtained from four SSc patients collected over a minimum of two years. Repertoire overlap analysis revealed that samples taken from the same individual over time shared a high number of TCRβ sequences, indicating a clear temporal persistence of the TCRβ repertoire in CD4+ as well as CD8+ T-cells. Moreover, the TCRβs that were found with a high frequency at one time point were also found with a high frequency at the other time points (even after almost four years), showing that frequencies of dominant TCRβs are largely consistent over time. We also show that TCRβ generation probability and observed TCR frequency are not related in SSc samples, showing that clonal expansion and persistence of TCRβs is caused by antigenic selection rather than convergent recombination. Moreover, we demonstrate that TCRβ diversity is lower in CD4+ and CD8+ T-cells from SSc patients compared with memory T-cells from healthy individuals, as SSc TCRβ repertoires are largely dominated by clonally expanded persistent TCRβ sequences. Lastly, using "Grouping of Lymphocyte Interactions by Paratope Hotspots" (GLIPH2), we identify clusters of TCRβ sequences with homologous sequences that potentially recognize the same antigens and contain TCRβs that are persist in SSc patients. In conclusion, our results show that CD4+ and CD8+ T-cells are highly persistent in SSc patients over time, and this persistence is likely a result from antigenic selection. Moreover, persistent TCRs form high similarity clusters with other (non-)persistent sequences that potentially recognize the same epitopes. These data provide evidence for an antigen driven expansion of CD4+/CD8+ T-cells in SSc.
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Affiliation(s)
- N H Servaas
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - F Zaaraoui-Boutahar
- Department of Viroscience, Erasmus Medical Center Rotterdam, Rotterdam, the Netherlands
| | - C G K Wichers
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - A Ottria
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - E Chouri
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - A J Affandi
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - S Silva-Cardoso
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - M van der Kroef
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - T Carvalheiro
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - F van Wijk
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - T R D J Radstake
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
| | - A C Andeweg
- Department of Viroscience, Erasmus Medical Center Rotterdam, Rotterdam, the Netherlands
| | - A Pandit
- Department of Rheumatology & Clinical Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands; Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands.
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23
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Douglas AS, Shearer JA, Okolo A, Pandit A, Gilvarry M, Doyle KM. The Relationship Between Cerebral Reperfusion And Regional Expression Of Matrix Metalloproteinase-9 In Rat Brain Following Focal Cerebral Ischemia. Neuroscience 2020; 453:256-265. [PMID: 33220187 DOI: 10.1016/j.neuroscience.2020.10.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 10/23/2020] [Accepted: 10/27/2020] [Indexed: 12/29/2022]
Abstract
We investigated the effect of full and partial mechanical reperfusion on MMP-9 expression in rat brain following middle cerebral artery occlusion, mimicking mechanical thrombectomy. Using percentage hemispheric lesion volume and oedema as measures, partial reperfusion reduced extent of brain damage caused by MCA occlusion, but the protective effect was less pronounced than with complete reperfusion. Using ELISA quantification in fresh frozen tissue, confirmed by immunofluorescence in perfusion fixed tissue, increased MMP-9 expression was observed in infarcted tissue. MMP-9 was increased in lesioned tissue of the anterior and posterior temporal cortex and underlying striatal tissue, but also the normal appearing frontal cortex. No significant increase in MMP-9 in the hippocampus was observed, nor in the unlesioned contralateral hemisphere. Both partial reperfusion and full reperfusion reduced the regional MMP expression significantly. The highest levels of MMP-9 were observed in lesioned brain regions in the non-reperfused group. MMP-9 expression was evident in microvessels and in neuronal cell bodies of affected tissue. This study shows that MMP-9 brain levels are reduced relative to the extent of reperfusion. These observations suggest targeting early increases in MMP-9 expression as a possible neuroprotective therapeutic strategy and highlight the rat MCA occlusion model as an ideal model in which to study candidate therapeutics.
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Affiliation(s)
- A S Douglas
- Department of Physiology and Galway Neuroscience Centre, School of Medicine, National University of Ireland, Galway, Ireland; CÚRAM-Centre for Research in Medical Devices, National University of Ireland Galway, Galway, Ireland.
| | - J A Shearer
- Department of Physiology and Galway Neuroscience Centre, School of Medicine, National University of Ireland, Galway, Ireland; CÚRAM-Centre for Research in Medical Devices, National University of Ireland Galway, Galway, Ireland
| | - A Okolo
- Department of Physiology and Galway Neuroscience Centre, School of Medicine, National University of Ireland, Galway, Ireland; CÚRAM-Centre for Research in Medical Devices, National University of Ireland Galway, Galway, Ireland
| | - A Pandit
- CÚRAM-Centre for Research in Medical Devices, National University of Ireland Galway, Galway, Ireland
| | | | - K M Doyle
- Department of Physiology and Galway Neuroscience Centre, School of Medicine, National University of Ireland, Galway, Ireland; CÚRAM-Centre for Research in Medical Devices, National University of Ireland Galway, Galway, Ireland
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24
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Gupta S, Patwardhan G, Parikh T, Kadam S, Vaidya U, Pandit A. Which long line do we use in very low birth weight neonates; umbilical venous catheter or peripherally inserted central catheter? J Neonatal Perinatal Med 2020; 14:229-235. [PMID: 33104045 DOI: 10.3233/npm-190379] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 11/15/2022]
Abstract
BACKGROUND Umbilical venous catheters (UVC) and peripherally inserted central catheters (PICC) are commonly used in preterms. UVC is cheap, easy to insert but has shorter dwell time. UVC is replaced after 7 days due to the risk of complications. This is associated with increased cost, work, and risk of nosocomial infections. The aim of this study was to determine the antenatal and postnatal factors that predict the need for a central line for more than 7 days, thus helping select between UVC or PICC on day 1 of life in babies ≤1500 grams. METHODS We retrospectively collected antenatal and postnatal data of VLBW neonates over a period of 1 year who needed CL during their NICU stay. We then divided them into two cohorts. Group 1: CL ≤7 days. Group 2: CL > 7 days. RESULTS Sepsis and catheter complications were lower with use of a single CL or duration being ≤7 days. Birth weight, incomplete/no antenatal steroids, need for resuscitation, low Apgar's, RDS, hs-PDA, and initiation of feeds beyond 24 hours of birth were significant. The score was devised based on factors found significant that had an acceptable AUC of 0.767 on ROC analysis with a score of 1 or above having 74.8% sensitivity and 67.7% specificity for prediction of need for CL > 7 days. CONCLUSIONS Birth weight ≤1000 grams, incomplete steroids and need for resuscitation at birth were predictive of the need of CL beyond seven days, on day one of life.
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Affiliation(s)
- S Gupta
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
| | - G Patwardhan
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
| | - T Parikh
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
| | - S Kadam
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
| | - U Vaidya
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
| | - A Pandit
- Department of Pediatrics, KEM Hospital, Rasta Peth, Pune Maharashtra, India
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25
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Pandit A, Khare L, Jahagirdar D, Srivastav A, Jain R, Dandekar P. Probing synergistic interplay between bio-inspired peptidomimetic chitosan-copper complexes and doxorubicin. Int J Biol Macromol 2020; 161:1475-1483. [PMID: 32750482 DOI: 10.1016/j.ijbiomac.2020.07.241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 07/13/2020] [Accepted: 07/22/2020] [Indexed: 01/23/2023]
Abstract
The current investigation reports a novel and facile method for modification of low molecular weight chitosan (Cs) with guanidine moieties, aimed at enhancing its cellular interaction and thus augmenting its cellular internalization. Guadinylated chitosan-copper (Cs-Gn-Cu) chelates, based on copper-nitrogen co-ordination, were established. Characterization of chelates was conducted using 1H NMR, 13C NMR, XPS, XRD, TGA-DTA, and GPC techniques. Anticancer activity of formed chelates was confirmed against A549 cells using MTT assay. Experimental outcomes, for the first time, have provided an empirical evidence for synergistic interaction between the chelated polymer (Cs-Gn-Cu) and the established anti-cancer agent, Doxorubicin (Dox), based on analysis by the Chou Talalay method and estimation of their combination indices. ROS induction was demonstrated as the mechanism of action of the chelated polymer, which supplemented rapid destruction of cancerous cells by Dox. These findings strongly advocate the need for harnessing unexplored potential of these innovative metal polymer chelates in cases of Dox resistant lung cancer, wherein the polymeric system itself would serve as an anti-cancer agent.
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Affiliation(s)
- A Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - L Khare
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - D Jahagirdar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - A Srivastav
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - R Jain
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India.
| | - P Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India.
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26
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Pandit A, Adholeya A, Cahill D, Brau L, Kochar M. Microbial biofilms in nature: unlocking their potential for agricultural applications. J Appl Microbiol 2020; 129:199-211. [PMID: 32034822 DOI: 10.1111/jam.14609] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 01/23/2020] [Accepted: 02/05/2020] [Indexed: 12/17/2022]
Abstract
Soil environments are dynamic and the plant rhizosphere harbours a phenomenal diversity of micro-organisms which exchange signals and beneficial nutrients. Bipartite beneficial or symbiotic interactions with host roots, such as mycorrhizae and various bacteria, are relatively well characterized. In addition, a tripartite interaction also exists between plant roots, arbuscular mycorrhizal fungi (AMF) and associated bacteria. Bacterial biofilms exist as a sheet of bacterial cells in association with AMF structures, embedded within a self-produced exopolysaccharide matrix. Such biofilms may play important functional roles within these tripartite interactions. However, the details about such interactions in the rhizosphere and their relevant functional relationships have not been elucidated. This review explores the current understanding of naturally occurring microbial biofilms, and their interaction with biotic surfaces, especially AMF. The possible roles played by bacterial biofilms and the potential for their application for a more productive and sustainable agriculture is discussed in this review.
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Affiliation(s)
- A Pandit
- TERI Deakin Nanobiotechnology Centre, Sustainable Agriculture Division, The Energy and Resources Institute, TERI Gram, Gwal Pahari, Gurugram, Haryana, India
- School of Life and Environmental Sciences, Deakin University, Geelong, Vic, Australia
| | - A Adholeya
- TERI Deakin Nanobiotechnology Centre, Sustainable Agriculture Division, The Energy and Resources Institute, TERI Gram, Gwal Pahari, Gurugram, Haryana, India
| | - D Cahill
- School of Life and Environmental Sciences, Deakin University, Geelong, Vic, Australia
| | - L Brau
- School of Life and Environmental Sciences, Deakin University, Geelong, Vic, Australia
| | - M Kochar
- TERI Deakin Nanobiotechnology Centre, Sustainable Agriculture Division, The Energy and Resources Institute, TERI Gram, Gwal Pahari, Gurugram, Haryana, India
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Servaas NH, Spierings J, Pandit A, van Laar JM. The role of innate immune cells in systemic sclerosis in the context of autologous hematopoietic stem cell transplantation. Clin Exp Immunol 2020; 201:34-39. [PMID: 31990046 PMCID: PMC7290088 DOI: 10.1111/cei.13419] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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] [Accepted: 01/17/2020] [Indexed: 12/30/2022] Open
Abstract
Systemic sclerosis (SSc) is a complex, heterogeneous autoimmune connective tissue disease. Autologous hematopoietic stem‐cell transplantation (AHSCT) has emerged as a valuable treatment option for rapidly progressive diffuse cutaneous SSc (dcSSc) patients, and thus far is the only treatment that has been shown to have a long‐term clinical benefit. AHSCT is thought to reintroduce immune homeostasis through elimination of pathogenic self‐reactive immune cells and reconstitution of a new, tolerant immune system. However, the mechanism of action underlying this reset to tolerance remains largely unknown. In this study we review the immune mechanisms underlying AHSCT for SSc, with a focus on the role of the innate immune cells, including monocytes and natural killer (NK) cells, in restoring immune balance after AHSCT.
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Affiliation(s)
- N H Servaas
- Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht, the Netherlands.,Center for Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - J Spierings
- Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - A Pandit
- Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht, the Netherlands.,Center for Translational Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - J M van Laar
- Department of Rheumatology and Clinical Immunology, University Medical Center Utrecht, Utrecht, the Netherlands
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Pandit A, Deshpande C, Patil S, Jain R, Dandekar P. Mechanistic insights into controlled depolymerization of Chitosan using H-Mordenite. Carbohydr Polym 2020; 230:115600. [PMID: 31887872 DOI: 10.1016/j.carbpol.2019.115600] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 10/25/2019] [Accepted: 11/09/2019] [Indexed: 02/05/2023]
Abstract
Kinetics of chitosan depolymerization were studied in dilute acetic acid solution, in presence of H-Mordenite (H-MOR). Rate constants for chitosan depolymerization were determined by measurement of molecular weight, using Gel permeation Chromatography (GPC). Depolymerization rate of chitosan was altered in presence of an acidic, porous material like H-MOR. Maximum concentration of H-MOR studied during process led to minimal increase in energy of activation, from 20.54 kJ/moL to 23.25 kJ/moL. Infra-red spectroscopy, adsorption studies and rheological assessment indicated adsorption /grafting of chitosan onto porous H-MOR surface as the possible mechanism for facilitation of the depolymerization process. Under extreme conditions investigated during process optimization, H-MOR resulted in a three-fold reduction in 5-Hydroxy Methyl Furfural (5-HMF) formation and over ten times decrease in glucosamine content, as compared to reactions conducted without H-MOR. Therefore, presence of H-MOR is imperative to cleave chitosan in controlled manner and obtain products of desired molecular weight, with fewer impurities.
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Affiliation(s)
- A Pandit
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - C Deshpande
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - S Patil
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India
| | - R Jain
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai-19, India.
| | - P Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Matunga, Mumbai-19, India.
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Acharya M, Banerjee S, Pandit A, Gangopadhay G. Steroid failure in primary/recurrent long segment myelitis: What else? J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1223] [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: 10/25/2022]
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Preeti S, Kadam A, Kadam S, Vaidya U, Kumar P, Bhagat I, Pandit A, Chouthai NS. Anthropometric measures as biomarkers of neurodevelopmental outcomes of newborns with moderate to severe hypoxic ischemic encephalopathy. J Neonatal Perinatal Med 2019; 12:127-134. [PMID: 30741696 DOI: 10.3233/npm-17151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Perinatal asphyxia is a prominent cause of neonatal mortality in the developing world. Growth in head circumference is associated with improved neurodevelopment. Previous studies found a positive correlation between additional dietary supplementation and growth in head circumference among newborns with perinatal brain injury. This study aims to evaluate the association between anthropometric parameters and developmental outcomes in newborns with hypoxic ischemic encephalopathy (HIE). METHODS Newborns at ≥36 weeks gestation with moderate to severe HIE were included in the study and growth parameters were monitored. Newborns with life-threatening anomalies were excluded. None of the study participants received therapeutic hypothermia (TH). Developmental Assessment Scale for Indian Infants (DASII) was used to evaluate neurodevelopmental outcomes at 1 year of age. RESULTS Of 76 study participants, 46 were followed for 12 months, 28 died, and 2 were lost to follow-up. HIE stage III, Apgar score <5 at 5 minutes of age, pH ≤ 7.1 on first blood gas and base deficit > - 16 was associated with death or disability at 1 year of age. All anthropometric parameters were significantly lower in presence of death or disability. pH ≤ 7.1 at birth (odds ratio: 11.835, 95% CI 2.273-61.629, p = 0.003) and weight gain at one year (odds ratio 1.001, 95% CI 1.000-1.002, p = 0.03) were significantly associated with death and disability. CONCLUSION pH > 7.1 at birth, and weight gain were associated with better neurodevelopmental outcomes at 1 year of age. Thus, in addition to TH, nutritional interventions may potentially improve outcomes among newborns with HIE.
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Affiliation(s)
- S Preeti
- Department of Pediatrics, KEM Hospital, Pune, India
| | - A Kadam
- Department of Pediatrics, KEM Hospital, Pune, India
| | - S Kadam
- Department of Pediatrics, KEM Hospital, Pune, India
| | - U Vaidya
- Department of Pediatrics, KEM Hospital, Pune, India
| | - P Kumar
- Division of Neonatal-Perinatal Medicine, Wayne State University, Children's Hospital of Michigan and Hutzel Women's Hospital, Detroit, MI, USA
| | - I Bhagat
- Division of Neonatal-Perinatal Medicine, Wayne State University, Children's Hospital of Michigan and Hutzel Women's Hospital, Detroit, MI, USA
| | - A Pandit
- Department of Pediatrics, KEM Hospital, Pune, India
| | - N S Chouthai
- Division of Neonatal-Perinatal Medicine, Wayne State University, Children's Hospital of Michigan and Hutzel Women's Hospital, Detroit, MI, USA
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Azadi-Chegeni F, Schiphorst C, Pandit A. In vivo NMR as a tool for probing molecular structure and dynamics in intact Chlamydomonas reinhardtii cells. Photosynth Res 2018; 135:227-237. [PMID: 28646418 PMCID: PMC5783995 DOI: 10.1007/s11120-017-0412-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 06/07/2017] [Indexed: 06/14/2023]
Abstract
We report the application of NMR dynamic spectral editing for probing the structure and dynamics of molecular constituents in fresh, intact cells and in freshly prepared thylakoid membranes of Chlamydomonas reinhardtii (Cr.) green algae. For isotope labeling, wild-type Cr. cells were grown on 13C acetate-enriched minimal medium. 1D 13C J-coupling based and dipolar-based MAS NMR spectra were applied to distinguish 13C resonances of different molecular components. 1D spectra were recorded over a physiological temperature range, and whole-cell spectra were compared to those taken from thylakoid membranes, evaluating their composition and dynamics. A theoretical model for NMR polarization transfer was used to simulate the relative intensities of direct, J-coupling, and dipolar-based polarization from which the degree of lipid segmental order and rotational dynamics of the lipid acyl chains were estimated. We observe that thylakoid lipid signals dominate the lipid spectral profile of whole algae cells, demonstrating that with our novel method, thylakoid membrane characteristics can be detected with atomistic precision inside intact photosynthetic cells. The experimental procedure is rapid and applicable to fresh cell cultures, and could be used as an original approach for detecting chemical profiles, and molecular structure and dynamics of photosynthetic membranes in vivo in functional states.
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Affiliation(s)
- Fatemeh Azadi-Chegeni
- Department of Solid State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
| | - Christo Schiphorst
- Department of Solid State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Anjali Pandit
- Department of Solid State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333CC, Leiden, The Netherlands.
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Khadka D, Oh GS, Kim HJ, Lee SH, Shen A, Lee SB, Pandit A, Sharma S, Yang SH, So HS. Augmentation of NAD+ levels by enzymatic action of NAD(P)H quinone oxidoreductase 1 attenuates adriamycin-induced cardiomyopathy. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy047.052] [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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Affiliation(s)
- Anjali Pandit
- Department of Solid-State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
| | - Ivo H M van Stokkum
- Department of Physics and Astronomy and Institute for Lasers, Life and Biophotonics, Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan, 1081 HV, Amsterdam, The Netherlands
| | - Herbert van Amerongen
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET, Wageningen, The Netherlands
| | - Roberta Croce
- Department of Physics and Astronomy and Institute for Lasers, Life and Biophotonics, Faculty of Science, Vrije Universiteit Amsterdam, De Boelelaan, 1081 HV, Amsterdam, The Netherlands
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Pandit A, Sachdev M, Vyas C, Dua V. Varied Presentation Of Human Herpes Virus (Hhv-6) Infection In Children Following Allogenic Hematopoetic Stem Cell Transplant (Allo-Hsct). Pediatric Hematology Oncology Journal 2018. [DOI: 10.1016/j.phoj.2018.11.126] [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
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Vyas C, Sachdev M, Pandit A, Dua V. Oral Valganciclovir Used As Pre-Emptive Therapy For Cytomegalovirus (Cmv) Reactivation In Paediatric Allogenic Stem Cell Transplant Patients: A Single Centre Experience From North India. Pediatric Hematology Oncology Journal 2018. [DOI: 10.1016/j.phoj.2018.11.122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Krishnan M, Moolenaar GF, Gupta KBSS, Goosen N, Pandit A. Large-scale in vitro production, refolding and dimerization of PsbS in different microenvironments. Sci Rep 2017; 7:15200. [PMID: 29123155 PMCID: PMC5680255 DOI: 10.1038/s41598-017-15068-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 10/17/2017] [Indexed: 11/09/2022] Open
Abstract
Plants adapt to fluctuating light conditions by a process called non-photochemical quenching (NPQ), where membrane protein PsbS plays a crucial role and transforms a change in the pH-gradient across the thylakoid membrane under excess light conditions into a photoprotective state, leading to de-excitation of antenna chlorophylls. The PsbS activation mechanism is elusive and has been proposed to involve a monomerization step and protonation of specific residues. To elucidate its function, it is essential to produce PsbS in large quantities, stabilize PsbS in a membrane-mimicking environment and analyze its pH-dependent conformational structure. We present an approach for large-scale in-vitro production and spectroscopic characterization of PsbS under controlled, non-crystalline conditions. We produced PsbS of the moss Physcomitrella patens in milligram quantities in E. coli, refolded PsbS in several detergent types and analyzed its conformation at neutral and low pH by Dynamic Light Scattering and NMR spectroscopy. Our results reveal that at both pH conditions, PsbS exist as dimers or in apparent monomer-dimer equilibria. Lowering of the pH induces conformational changes, destabilizes the dimer state and shifts the equilibria towards the monomeric form. In vivo, a similar response upon thylakoid lumen acidification may tune PsbS activity in a gradual manner.
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Affiliation(s)
- Maithili Krishnan
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, The Netherlands
| | - Geri F Moolenaar
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, The Netherlands
| | - Karthick Babu Sai Sankar Gupta
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, The Netherlands
| | - Nora Goosen
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, The Netherlands
| | - Anjali Pandit
- Leiden University, Leiden Institute of Chemistry, Gorlaeus Laboratories, Einsteinweg, 55 2333 CC, Leiden, The Netherlands.
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Yang S, Kwon K, Khadka D, Oh G, Kim H, Lee S, Pandit A, Lee S, So H. P1.02-003 Prevention of Adriamycin-induced Cardiac Damage by NAD-Modulation Prevention of Adriamycin-induced Cardiac Damage by NAD-Modulation. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.735] [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]
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Yang SH, Khadka D, Oh GS, Kim HJ, Lee SB, Pandit A, Lee S, So HS. Enzymatic action of NQO1 attenuates adriamycin-induced cardiotoxicity in mice. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw392.57] [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: 11/12/2022] Open
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Azeem A, Marani L, Fuller K, Spanoudes K, Pandit A, Zeugolis D. Influence of Nonsulfated Polysaccharides on the Properties of Electrospun Poly(lactic-co-glycolic acid) Fibers. ACS Biomater Sci Eng 2016; 3:1304-1312. [DOI: 10.1021/acsbiomaterials.6b00206] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Azeem
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - L. Marani
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - K. Fuller
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - K. Spanoudes
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - A. Pandit
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - D.I. Zeugolis
- Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biomedical Sciences Building, and ‡Science Foundation Ireland (SFI) Centre for Research in Medical Devices (CÚRAM), Biomedical Sciences Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
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Pandit A, Satija A, Singh SP, Bhatnagar S. Abstract PR325. Anesth Analg 2016. [DOI: 10.1213/01.ane.0000492721.96722.b3] [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: 11/05/2022]
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41
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Helling AL, Tsekoura EK, Biggs M, Bayon Y, Pandit A, Zeugolis DI. In Vitro Enzymatic Degradation of Tissue Grafts and Collagen Biomaterials by Matrix Metalloproteinases: Improving the Collagenase Assay. ACS Biomater Sci Eng 2016; 3:1922-1932. [PMID: 33440550 DOI: 10.1021/acsbiomaterials.5b00563] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [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: 12/19/2022]
Abstract
Matrix metalloproteinase-1 and -8 are active during the wound healing and remodelling processes, degrading native extracellular matrix and implantable devices. However, traditional in vitro assays utilize primarily matrix metalloproteinase-1 to mimic the in vivo degradation microenvironment. Herein, we assessed the influence of various concentrations of matrix metalloproteinase- 1 and 8 (50, 100, and 200 U/mL) as a function of pH (5.5 and 7.4) and time (3, 6, 9, 12, and 24 h) on the degradation profile of three tissue grafts (chemically cross-linked Permacol, nonchemically cross-linked Permacol and nonchemically cross-linked Strattice) and a collagen biomaterial (nonchemically cross-linked collagen sponge). Chemically cross-linked and nonchemically cross-linked Permacol samples exhibited the highest resistance to enzymatic degradation, while nonchemically cross-linked collagen sponges exhibited the least resistance to enzymatic degradation. Qualitative and quantitative degradation analysis of all samples revealed a similar degradation profile over time, independently of the matrix metalloproteinase used and its respective concentration and pH. These data indicate that matrix metalloproteinase-1 and matrix metalloproteinase-8 exhibit similar degradation profile in vitro, suggesting that matrix metalloproteinase-8 should be used for collagenase assay.
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Affiliation(s)
| | | | | | - Y Bayon
- Sofradim Production, A Medtronic Company, Trévoux, France
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Smith SG, Pandit A, Rush SR, Wolf MS, Simon C. The association between patient activation and accessing online health information: results from a national survey of US adults. Health Expect 2015; 18:3262-73. [PMID: 25475371 PMCID: PMC5810745 DOI: 10.1111/hex.12316] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [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] [Accepted: 11/12/2014] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND There are increasing opportunities for the public to access online health information, but attitudinal barriers to use are less well-known. Patient activation is associated with key health outcomes, but its relationship with using online health information is not known. OBJECTIVE We examined the relationship between patient activation and the likelihood of accessing a range of different types of online health information in a nationally representative US sample. DESIGN Cross-sectional nationally representative survey. SETTING AND PARTICIPANTS Data were from an online (n = 2700) and random digit dial telephone survey (n = 700) of US adults (total n = 3400). MAIN VARIABLES STUDIED Respondent characteristics and the Patient Activation Measure. MAIN OUTCOME MEASURES Self-reported access of five types of online health information in the past 12 months (online medical records, cost estimation tools, quality comparison tools, health information about a specific condition, preventive health information). RESULTS Approximately, one-fifth of the sample had accessed their medical record (21.6%), treatment cost estimation tools (17.3%) and hospital and physician quality comparison tools (21.8%). Nearly half of the sample had accessed information about medical conditions or treatments (48.3%) or preventive health and well-being (45.9%). In multivariable analyses adjusted for participant characteristics, respondents with greater patient activation were more likely to have accessed all types of health information other than cost estimation tools. DISCUSSION AND CONCLUSIONS Activated people are more likely to make use of online heath information. Increasing patient activation could improve the public's ability to participate in health care and personal health self-management by encouraging health information seeking.
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Affiliation(s)
- Samuel G. Smith
- Department of General Internal Medicine and GeriatricsNorthwestern UniversityChicagoILUSA
- Wolfson Institute of Preventive MedicineQueen Mary University of LondonLondonUK
| | - Anjali Pandit
- Department of General Internal Medicine and GeriatricsNorthwestern UniversityChicagoILUSA
| | | | - Michael S. Wolf
- Department of General Internal Medicine and GeriatricsNorthwestern UniversityChicagoILUSA
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Sanami M, Shtein Z, Sweeney I, Sorushanova A, Rivkin A, Miraftab M, Shoseyov O, O’Dowd C, Mullen AM, Pandit A, Zeugolis DI. Biophysical and biological characterisation of collagen/resilin-like protein composite fibres. Biomed Mater 2015; 10:065005. [DOI: 10.1088/1748-6041/10/6/065005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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44
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Kumar A, Prasad M, Pandit A, Kumar P, Chakravarty K, Kathuria P, Misra S. A systematic review and meta-analysis of clinical trials of bone marrow mononuclear cell therapy for patients with ischemic stroke. J Neurol Sci 2015. [DOI: 10.1016/j.jns.2015.09.057] [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]
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45
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Gyanwali P, Humagain BR, Aryal KK, Pandit A, Acharya T, Bista B, Dhimal M, Karki KB. Surveillance of Quality of Medicines Available in the Nepalese Market: A Study from Kathmandu Valley. J Nepal Health Res Counc 2015; 13:233-240. [PMID: 27005718] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND Many countries are having problem of substandard and counterfeit drugs which results in life threatening issues, financial loss of consumers and loss in trust on health system. This study is concerned with the assessment of drugs quality available in the Nepalese market. METHODS A cross sectional survey was carried out in Kathmandu valley. Five different brands from each eight molecules of drugs (Paracetamol tablet, Cloxacillin capsule, Amlodipine tablet, Metformin tablet, Losartan tablet, Cefixime tablet, Ofloxacin tablet, Carbamazepine tablet) were purposively selected. Registration compliance was verified from Department of Drug Administration (DDA) and laboratorial analysis was done in two different laboratories. RESULTS Out of 40 drug samples, 90% did not comply with the existing regulatory requirement on labeling and 42.5% brands did not mention about the pharmacopoeial standard. There was no uniformity in mentioning the selflife. Similarly, large variation was seen on price of same generic drugs. Laboratory analysis showed that 40% samples failed to meet the standard among domestic companies and 28% among imported brands. Altogether 32.5% samples were found to be of substandard quality. Only the result of one sample matched with both laboratories. This indicates that there was variation in the selected two laboratories. CONCLUSIONS The result of this survey indicates that, substandard medicines are available in Nepalese market. Moreover, there is weak regulation and no uniformity in similar pharmaceutical products. A larger study is required to access the quality of pharmaceutical products in the Nepalese market with testing of products in more than two independent laboratories.
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Affiliation(s)
- P Gyanwali
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - B R Humagain
- Nepal Pharmacy Council (NPC), Bijulibazar, Kathmandu, Nepal
| | - K K Aryal
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - A Pandit
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - T Acharya
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - B Bista
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - M Dhimal
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
| | - K B Karki
- Nepal Health Research Council (NHRC), Ramshah Path, Kathmandu, Nepal
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Smith SG, Pandit A, Rush SR, Wolf MS, Simon CJ. The Role of Patient Activation in Preferences for Shared Decision Making: Results From a National Survey of U.S. Adults. J Health Commun 2015; 21:67-75. [PMID: 26313690 PMCID: PMC4706032 DOI: 10.1080/10810730.2015.1033115] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Studies investigating preferences for shared decision making (SDM) have focused on associations with sociodemographic variables, with few investigations exploring patient factors. We aimed to investigate the relationship between patient activation and preferences for SDM in 6 common medical decisions among a nationally representative cross-sectional survey of American adults. Adults older than 18 were recruited online (n = 2,700) and by telephone (n = 700). Respondents completed sociodemographic assessments and the Patient Activation Measure. They were also asked whether they perceived benefit (yes/no) in SDM in 6 common medical decisions. Nearly half of the sample (45.9%) reached the highest level of activation (Level 4). Activation was associated with age (p < .001), higher income (p = .001), higher education (p = .010), better self-rated health (p < .001), and fewer chronic conditions (p = .050). The proportion of people who agreed that SDM was beneficial varied from 53.1% (deciding the necessity of a diagnostic test) to 71.8% (decisions associated with making lifestyle changes). After we controlled for participant characteristics, higher activation was associated with greater perceived benefit in SDM across 4 of the 6 decisions. Preferences for SDM varied among 6 common medical scenarios. Low patient activation is an important barrier to SDM that could be ameliorated through the development of behavioral interventions.
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Affiliation(s)
- Samuel G. Smith
- Division of General Internal Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
- Wolfson Institute of Preventive Medicine, Queen Mary University of London, London, United Kingdom
| | - Anjali Pandit
- Division of General Internal Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | | | - Michael S. Wolf
- Division of General Internal Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
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47
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Mathes T, Heilmann M, Pandit A, Zhu J, Ravensbergen J, Kloz M, Fu Y, Smith BO, Christie JM, Jenkins GI, Kennis JTM. Proton-Coupled Electron Transfer Constitutes the Photoactivation Mechanism of the Plant Photoreceptor UVR8. J Am Chem Soc 2015; 137:8113-20. [DOI: 10.1021/jacs.5b01177] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tilo Mathes
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Monika Heilmann
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Anjali Pandit
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
- Department
of Solid-State NMR, Leiden Institute of Chemistry, Leiden University, Einsteinweg
55, 2333 CC Leiden, The Netherlands
| | - Jingyi Zhu
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Janneke Ravensbergen
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Miroslav Kloz
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
| | - Yinan Fu
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Brian O. Smith
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - John M. Christie
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Gareth I. Jenkins
- Institute
of Molecular, Cell and Systems Biology, College of Medical, Veterinary
and Life Sciences, Bower Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - John T. M. Kennis
- Biophysics
Section, Department of Physics and Astronomy, Faculty of Sciences, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
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48
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Lomas A, Ryan C, Sorushanova A, Shologu N, Sideri A, Tsioli V, Fthenakis G, Tzora A, Skoufos I, Quinlan L, O'Laighin G, Mullen A, Kelly J, Kearns S, Biggs M, Pandit A, Zeugolis D. The past, present and future in scaffold-based tendon treatments. Adv Drug Deliv Rev 2015; 84:257-77. [PMID: 25499820 DOI: 10.1016/j.addr.2014.11.022] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 11/08/2014] [Accepted: 11/12/2014] [Indexed: 02/07/2023]
Abstract
Tendon injuries represent a significant clinical burden on healthcare systems worldwide. As the human population ages and the life expectancy increases, tendon injuries will become more prevalent, especially among young individuals with long life ahead of them. Advancements in engineering, chemistry and biology have made available an array of three-dimensional scaffold-based intervention strategies, natural or synthetic in origin. Further, functionalisation strategies, based on biophysical, biochemical and biological cues, offer control over cellular functions; localisation and sustained release of therapeutics/biologics; and the ability to positively interact with the host to promote repair and regeneration. Herein, we critically discuss current therapies and emerging technologies that aim to transform tendon treatments in the years to come.
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Monaghan M, Greiser U, Cao H, Wang W, Pandit A. An antibody fragment functionalized dendritic PEGylated poly(2-(dimethylamino)ethyl diacrylate) as a vehicle of exogenous microRNA. Drug Deliv Transl Res 2015; 2:406-14. [PMID: 25787178 DOI: 10.1007/s13346-012-0097-8] [Citation(s) in RCA: 9] [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: 01/06/2023]
Abstract
The translation of interfering RNA to the clinic requires more effective delivery agents to enable safe and efficient delivery. The aim of this work was to create a multi-functional delivery agent using deactivation enhanced ATRP synthesis of poly(dimethylamino)ethyl methacrylate (pDMAEMA)-co-PEGMEA/PEGDA (pD-b-P/DA) with linear pDMAEMA as a macro-initiator. The pD-b-P/DA was characterized for its potential to bind synthetic microRNA mimics to form structures and reacted with antibody-derived fragments (Fabs) using Michael-type addition. Conjugation of antibody fragments was verified using SDS-PAGE. Functional delivery of these interfering RNA complexes was proven using a dual luciferase reporter assay. Functional silencing of a reporter gene was improved by complexation of microRNA mimics with pD-b-P/DA alone and with Fab-decorated pD-b-P/DA. The improved silencing with Fab-decorated pD-b-P/DA was evident at 48 h but disappeared at 96 h. The resultant agent enables complexation of nucleic acid (microRNA mimic) and facile conjugation of antibody fragments via a Michael-type addition. In conclusion, this platform is effective at silencing in this reporter system and has potential as an effective delivery system of interfering RNA.
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Affiliation(s)
- M Monaghan
- Network of Excellence for Functional Biomaterials, National University of Ireland, Galway, Ireland
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50
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Redondo J, Velasco D, Pérez-Perrino M, Reinecke H, Gallardo A, Pandit A, Elvira C. Synergistic effect of pendant hydroxypropyl and pyrrolidine moieties randomly distributed along polymethacrylamide backbones on in vitro DNA-transfection. Eur J Pharm Biopharm 2015; 90:38-43. [DOI: 10.1016/j.ejpb.2014.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 11/07/2014] [Accepted: 11/10/2014] [Indexed: 10/24/2022]
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