1
|
Cell-Derived Nanovesicles as Exosome-Mimetics for Drug Delivery Purposes: Uses and Recommendations. Methods Mol Biol 2021; 2211:147-170. [PMID: 33336276 DOI: 10.1007/978-1-0716-0943-9_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Cell-derived Drug Delivery Systems (DDSs), particularly exosomes, have grown in popularity and have been increasingly explored as novel DDSs, due to their intrinsic targeting capabilities. However, clinical translation of exosomes is impeded by the tedious isolation procedures and poor yield. Cell-derived nanovesicles (CDNs) have recently been produced and proposed as exosome-mimetics. Various methods for producing exosome-mimetics have been developed. In this chapter, we present a simple, efficient, and cost-effective CDNs production method that uses common laboratory equipment (microcentrifuge) and spin cups. Through a series of extrusion and size exclusion steps, CDNs are produced from in vitro cell culture and are found to highly resemble the endogenous exosomes. Thus, we envision that this strategy holds great potential as a viable alternative to exosomes in the development of ideal DDS.
Collapse
|
2
|
Effect of plasma exchange on colchicine elimination in overdose - a case report. Clin Toxicol (Phila) 2021; 59:849-850. [PMID: 33555948 DOI: 10.1080/15563650.2021.1877298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
3
|
Uniportal Video-Assisted Thoracotomy during Excimer Laser-Guided Cardiac Implantable Electronic Devices Lead Extraction: A 5-Year Single-Centre Experience. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
4
|
Protein Coating of Bacterial Nanocellulose Small Diameter Vascular Grafts Leads to Improved Endothelialization. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
5
|
Quantifying the Stress Levels of Cardiac Surgery Residents during Coronary Artery Bypass Grafting. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Complications following Left Ventricular Assist Device Implantation—Comparison of HeartWare and HeartMate III: A Single-Center 5-Year Experience. Thorac Cardiovasc Surg 2020. [DOI: 10.1055/s-0040-1705395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
7
|
Workshop Report: USP Workshop on Advancements in In Vitro Performance Testing of Drug Products. DISSOLUT TECHNOL 2020. [DOI: 10.14227/dt270220p52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
8
|
Detection of Postoperative Atrial Fibrillation with a Smart Watch: Preliminary Results of a Clinical Investigation. Thorac Cardiovasc Surg 2020. [DOI: 10.1055/s-0040-1705422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
9
|
Welche Faktoren prädizieren eine Verschlechterung der gesundheitsbezogenen Lebensqualität bei COPD? Erste längsschnittliche Ergebnisse der COSYCONET COPD-Kohorte. Pneumologie 2018. [DOI: 10.1055/s-0037-1619341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
10
|
Diagnostik und Therapie von Patienten mit interstitiellen Lungenerkrankungen in Deutschland – das EXCITING ILD Register. Pneumologie 2018. [DOI: 10.1055/s-0037-1619191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
11
|
The revised GOLD 2017 COPD categorization in relation to comorbidities. Pneumologie 2018. [DOI: 10.1055/s-0037-1619396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
12
|
Time-frequency Techniques in Biomedical Signal Analysis. Methods Inf Med 2018; 52:279-96. [DOI: 10.3414/me12-01-0083] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 11/16/2012] [Indexed: 11/09/2022]
Abstract
SummaryObjectives: This review outlines the method -ological fundamentals of the most frequently used non-parametric time-frequency analysis techniques in biomedicine and their main properties, as well as providing decision aids concerning their applications.Methods: The short-term Fourier transform (STFT), the Gabor transform (GT), the S-transform (ST), the continuous Morlet wavelet transform (CMWT), and the Hilbert transform (HT) are introduced as linear transforms by using a unified concept of the time-frequency representation which is based on a standardized analytic signal. The Wigner-Ville dis -tribution (WVD) serves as an example of the ‘quadratic transforms’ class. The combination of WVD and GT with the matching pursuit (MP) decomposition and that of the HT with the empirical mode decomposition (EMD) are explained; these belong to the class of signal-adaptive approaches.Results: Similarities between linear transforms are demonstrated and differences with regard to the time-frequency resolution and interference (cross) terms are presented in detail. By means of simulated signals the effects of different time-frequency resolutions of the GT, CMWT, and WVD as well as the resolution-related properties of the inter -ference (cross) terms are shown. The method-inherent drawbacks and their consequences for the application of the time-frequency techniques are demonstrated by instantaneous amplitude, frequency and phase measures and related time-frequency representations (spectrogram, scalogram, time-frequency distribution, phase-locking maps) of measured magnetoencephalographic (MEG) signals.Conclusions: The appropriate selection of a method and its parameter settings will ensure readability of the time-frequency representations and reliability of results. When the time-frequency characteristics of a signal strongly correspond with the time-frequency resolution of the analysis then a method may be considered ‘optimal’. The MP-based signal-adaptive approaches are preferred as these provide an appropriate time-frequency resolution for all frequencies while simultaneously reducing interference (cross) terms.
Collapse
|
13
|
Dealing with Sternal Wound Healing Disorders after Cardiac Surgery: Bacterial Spectrum and Implications for Antibiotic Therapy. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1627932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
14
|
First Case of Late Onset Valve Dislocation after Aortic Valve Replacement with the Edwards Intuity Elite Rapid-Deployment Bioprosthesis. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1628112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
15
|
Sind Beeinträchtigungen der Lebensqualität (Dimensionen des EQ-5D) bereits bei Lungengesunden mit Lungenfunktion assoziiert (KORA F4L & Age). DAS GESUNDHEITSWESEN 2017. [DOI: 10.1055/s-0037-1605787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
16
|
Phase II study of cabazitaxel with or without abiraterone acetate and prednisone in patients with metastatic castrate resistant prostate cancer after prior docetaxel and abiraterone acetate. Ann Oncol 2017; 28:668. [PMID: 28426121 DOI: 10.1093/annonc/mdw674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
17
|
Kosten und gesundheitsbezogene Lebensqualität bei COPD-Patienten mit Alpha-1-Antitrypsin-Mangel: Ergebnisse der COSYCONET COPD-Kohorte. Pneumologie 2017. [DOI: 10.1055/s-0037-1598549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
18
|
Interims Analyse des EXCITING-ILD Registers (Registry for Exploring Clinical and Epidemiological Characteristics of Interstitial Lung Diseases). Pneumologie 2017. [DOI: 10.1055/s-0037-1598497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
19
|
Tissue Engineered Blood Vessels of Bacterial Nanocellulose: Impact of Surface Modification on Patency and Cell Immigration. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
20
|
Neutrophil Extracellular Traps as Predictive Markers of Inflammation in Patients Undergoing Cardiac Surgery with Cardiopulmonary Bypass. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
21
|
Prävalenz von Komorbiditäten bei COPD-Patienten und lungengesunden Kontrollen der Studie COSYCONET. Pneumologie 2016. [DOI: 10.1055/s-0036-1571970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
22
|
Interims Analyse des EXCITING-ILD Registers (Registry for Exploring Clinical and Epidemiological Characteristics of Interstitial Lung Diseases). Pneumologie 2016. [DOI: 10.1055/s-0036-1572075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
23
|
Direkte und indirekte Kosten bei COPD: Ergebnisse der COSYCONET COPD Kohorte im Vergleich zu bevölkerungsbezogenen Kontrollen. Pneumologie 2016. [DOI: 10.1055/s-0036-1572263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
24
|
Vergleich der Versorgungskosten von COPD-Patienten mit und ohne ischämische Herzerkrankung – erste Ergebnisse einer Kassendatenanalyse. Pneumologie 2016. [DOI: 10.1055/s-0036-1572267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
25
|
Advantages of signal-adaptive approaches for the nonlinear, time-variant analysis of heart rate variability of children with temporal lobe epilepsy. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2014:6377-80. [PMID: 25571455 DOI: 10.1109/embc.2014.6945087] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Major aim of our study is to demonstrate that signal-adaptive approaches improve the nonlinear and time-variant analysis of heart rate variability (HRV) of children with temporal lobe epilepsy (TLE). Nonlinear HRV analyses are frequently applied in epileptic patients. As HRV is characterized by components with oscillatory properties frequency-selective methods are in the focus, whereby application of nonlinear analysis to linear filtered signals seems to be doubtful. Signal-adaptive methods that preserve nonlinear properties and utilize only the signal data for an automatic computation of the result could benefit to nonlinear analysis of HRV. Combinations of (1) the signal-adaptive Matched Gabor Transform with time-variant nonlinear bispectral analysis and of (2) signal-adaptive Empirical Mode Decomposition methods with time-variant nonlinear stability analysis are investigated with regard to their application in the analysis of specific HRV components (respiratory sinus arrhythmia and Mayer wave associated low-frequency HRV components) of 18 children with TLE. Changes of timing and coordination of both HRV components during preictal, ictal and postictal periods occur which can be better quantified by advanced signal-adaptive methods. Both approaches contribute with specific importance to the analysis.
Collapse
|
26
|
Rationale for a Stronger Disposition of Chardonnay Wines for Stuck and Sluggish Fermentation. S AFR J ENOL VITIC 2015. [DOI: 10.21548/36-1-951] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
27
|
Matching Pursuit-Based Time-Variant Bispectral Analysis and its Application to Biomedical Signals. IEEE Trans Biomed Eng 2015; 62:1937-48. [DOI: 10.1109/tbme.2015.2407573] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
28
|
Occlusive gloves and skin conditions: is there a problem? Results of a cross-sectional study in a semiconductor company. Br J Dermatol 2015; 172:1058-65. [PMID: 25319754 DOI: 10.1111/bjd.13481] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/08/2014] [Indexed: 12/19/2022]
Abstract
BACKGROUND Although there is poor scientific evidence that working with occlusive gloves is as damaging as wet work, prolonged glove occlusion is considered to be a risk factor for developing hand eczema similar to wet work. OBJECTIVES To assess the effects of wearing occlusive gloves during the whole working day, without exposure to any additional hazardous substances, on skin condition and skin barrier function. METHODS We investigated 323 employees of a semiconductor production company in Germany: 177 clean-room workers wearing occlusive gloves during the whole shift (exposed group) and 146 employees working in administration (control group). A standardized interview was performed, the skin condition of both hands was studied using the quantitative skin score HEROS, and transepidermal water loss (TEWL) and stratum corneum hydration were measured. RESULTS There was no significant difference in skin condition between the two subgroups. Values for TEWL and corneometry were significantly higher in exposed participants (P < 0·05). However, the TEWL values were similar to control values if participants took off the occlusive gloves at least 30 min before the measurement. Hence, the effect of occlusion on skin barrier function seems to be transient. CONCLUSIONS Prolonged wearing of occlusive gloves with clean hands and without exposure to additional hazardous substances does not seem to affect the skin negatively.
Collapse
|
29
|
Analyse der Versorgungssitutation von Lungenkrebspatienten anhand von GKV-Routinedaten. Pneumologie 2015. [DOI: 10.1055/s-0035-1544651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
30
|
DZL BeoNet Register: Daten für Fragestellungen der Versorgungsforschung und der Gesundheitsökonomie. Pneumologie 2015. [DOI: 10.1055/s-0035-1544848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
31
|
Interimsanalyse des EXCITING-ILD Registers (Registry for Exploring Clinical and Epidemiological Characteristics of Interstitial Lung Diseases). Pneumologie 2015. [DOI: 10.1055/s-0035-1544823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
32
|
Cost-Effectiveness Models for Chronic Obstructive Pulmonary Disease (COPD): Cross-Model Comparison of Hypothetical Treatment Scenarios. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2014; 17:A557-A558. [PMID: 27201829 DOI: 10.1016/j.jval.2014.08.1836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
|
33
|
The primary care routine data registry BeoNet: health services and health economic research in COPD and ELD. Pneumologie 2014. [DOI: 10.1055/s-0034-1376779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
34
|
Can health-economic modeling be adjusted to assess the cost-effectiveness of prognostic testing in COPD management? Pneumologie 2014. [DOI: 10.1055/s-0034-1376778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
35
|
EXCITING (Registry for Exploring Clinical and Epidemiological Characteristics of Interstitial Lung Diseases) – ein aufregend neues deutsches ILD Register. Pneumologie 2014. [DOI: 10.1055/s-0034-1367998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
36
|
Targeting by cmHsp70.1-antibody coated and survivin miRNA plasmid loaded nanoparticles to radiosensitize glioblastoma cells. J Control Release 2013; 172:201-206. [DOI: 10.1016/j.jconrel.2013.08.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 08/14/2013] [Accepted: 08/17/2013] [Indexed: 10/26/2022]
|
37
|
Nanocarriers for intravenous injection--the long hard road to the market. Int J Pharm 2013; 457:50-62. [PMID: 24036012 DOI: 10.1016/j.ijpharm.2013.08.079] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 12/19/2022]
Abstract
Nanodispersed drug delivery systems for the intravenous injection have successfully overcome the hurdle of drug approval in the European Union and the United States. Although there is a need for highly advanced nanocarrier devices they have not been the result of a rational formulation design but were developed as stand-alone products in a long chain of case-by-case studies. This review focuses on aspects in development, composition, and manufacture of these innovative dosage forms that are relevant for the translation into new drug products.
Collapse
|
38
|
Diverse in- and output polarities and high complexity of local synaptic and non-synaptic signaling within a chemically defined class of peptidergic Drosophila neurons. Front Neural Circuits 2013; 7:127. [PMID: 23914156 PMCID: PMC3729985 DOI: 10.3389/fncir.2013.00127] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 07/12/2013] [Indexed: 12/31/2022] Open
Abstract
Peptidergic neurons are not easily integrated into current connectomics concepts, since their peptide messages can be distributed via non-synaptic paracrine signaling or volume transmission. Moreover, the polarity of peptidergic interneurons in terms of in- and out-put sites can be hard to predict and is very little explored. We describe in detail the morphology and the subcellular distribution of fluorescent vesicle/dendrite markers in CCAP neurons (NCCAP), a well defined set of peptidergic neurons in the Drosophila larva. NCCAP can be divided into five morphologically distinct subsets. In contrast to other subsets, serial homologous interneurons in the ventral ganglion show a mixed localization of in- and output markers along ventral neurites that defy a classification as dendritic or axonal compartments. Ultrastructurally, these neurites contain both pre- and postsynaptic sites preferably at varicosities. A significant portion of the synaptic events are due to reciprocal synapses. Peptides are mostly non-synaptically or parasynaptically released, and dense-core vesicles and synaptic vesicle pools are typically well separated. The responsiveness of the NCCAP to ecdysis-triggering hormone may be at least partly dependent on a tonic synaptic inhibition, and is independent of ecdysteroids. Our results reveal a remarkable variety and complexity of local synaptic circuitry within a chemically defined set of peptidergic neurons. Synaptic transmitter signaling as well as peptidergic paracrine signaling and volume transmission from varicosities can be main signaling modes of peptidergic interneurons depending on the subcellular region. The possibility of region-specific variable signaling modes should be taken into account in connectomic studies that aim to dissect the circuitry underlying insect behavior and physiology, in which peptidergic neurons act as important regulators.
Collapse
|
39
|
Vitamin D - effects on skeletal and extraskeletal health and the need for supplementation. Nutrients 2013; 5:111-48. [PMID: 23306192 PMCID: PMC3571641 DOI: 10.3390/nu5010111] [Citation(s) in RCA: 373] [Impact Index Per Article: 33.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 11/21/2012] [Accepted: 12/13/2012] [Indexed: 02/07/2023] Open
Abstract
Vitamin D, the sunshine vitamin, has received a lot of attention recently as a result of a meteoric rise in the number of publications showing that vitamin D plays a crucial role in a plethora of physiological functions and associating vitamin D deficiency with many acute and chronic illnesses including disorders of calcium metabolism, autoimmune diseases, some cancers, type 2 diabetes mellitus, cardiovascular disease and infectious diseases. Vitamin D deficiency is now recognized as a global pandemic. The major cause for vitamin D deficiency is the lack of appreciation that sun exposure has been and continues to be the major source of vitamin D for children and adults of all ages. Vitamin D plays a crucial role in the development and maintenance of a healthy skeleton throughout life. There remains some controversy regarding what blood level of 25-hydroxyvitamin D should be attained for both bone health and reducing risk for vitamin D deficiency associated acute and chronic diseases and how much vitamin D should be supplemented.
Collapse
|
40
|
Sunlight and Vitamin D: A global perspective for health. DERMATO-ENDOCRINOLOGY 2013; 5:51-108. [PMID: 24494042 PMCID: PMC3897598 DOI: 10.4161/derm.24494] [Citation(s) in RCA: 582] [Impact Index Per Article: 52.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 03/28/2013] [Indexed: 12/11/2022]
Abstract
Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3. Previtamin D3 and vitamin D3 also absorb UV B radiation and are converted into a variety of photoproducts some of which have unique biologic properties. Sun induced vitamin D synthesis is greatly influenced by season, time of day, latitude, altitude, air pollution, skin pigmentation, sunscreen use, passing through glass and plastic, and aging. Vitamin D is metabolized sequentially in the liver and kidneys into 25-hydroxyvitamin D which is a major circulating form and 1,25-dihydroxyvitamin D which is the biologically active form respectively. 1,25-dihydroxyvitamin D plays an important role in regulating calcium and phosphate metabolism for maintenance of metabolic functions and for skeletal health. Most cells and organs in the body have a vitamin D receptor and many cells and organs are able to produce 1,25-dihydroxyvitamin D. As a result 1,25-dihydroxyvitamin D influences a large number of biologic pathways which may help explain association studies relating vitamin D deficiency and living at higher latitudes with increased risk for many chronic diseases including autoimmune diseases, some cancers, cardiovascular disease, infectious disease, schizophrenia and type 2 diabetes. A three-part strategy of increasing food fortification programs with vitamin D, sensible sun exposure recommendations and encouraging ingestion of a vitamin D supplement when needed should be implemented to prevent global vitamin D deficiency and its negative health consequences.
Collapse
|
41
|
Molecular pharmacological profile of a novel thiazolinone-based direct and selective 5-lipoxygenase inhibitor. Br J Pharmacol 2012; 165:2304-13. [PMID: 21955369 DOI: 10.1111/j.1476-5381.2011.01707.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE The potency of many 5-lipoxygenase (5-LOX) inhibitors depends on the cellular peroxide tone and the mechanism of 5-LOX enzyme activation. Therefore, new inhibitors that act regardless of the mode of enzyme activation need to be developed. Recently, we identified a novel class of thiazolinone-based compounds as potent 5-LOX inhibitors. Here, we present the molecular pharmacological profile of (Z)-5-(4-methoxybenzylidene)-2-(p-tolyl)-5H-thiazol-4-one, compound C06. EXPERIMENTAL APPROACH Inhibition of 5-LOX product formation was determined in intact cells [polymorphonuclear leukocytes (PMNL), rat basophilic leukaemia-1, RAW264.7] and in cell-free assays [homogenates, 100, 000×g supernatant (S100), partially purified 5-LOX] applying different stimuli for 5-LOX activation. Inhibition of peroxisome proliferator-activated receptor (PPAR), cytosolic phospholipase A(2) (cPLA(2) ), 12-LOX, 15-LOX-1 and 15-LOX-2 as well as cyclooxygenase-2 (COX-2) were measured in vitro. KEY RESULTS C06 induced non-cytotoxic, direct 5-LOX inhibition with IC(50) values about 0.66 µM (intact PMNL, PMNL homogenates) and approximately 0.3 µM (cell-free PMNL S100, partially purified 5-LOX). Action of C06 was independent of the stimulus used for 5-LOX activation and cellular redox tone and was selective for 5-LOX compared with other arachidonic acid binding proteins (PPAR, cPLA(2) , 12-LOX, 15-LOX-1, 15-LOX-2, COX-2). Experimental results suggest an allosteric binding distinct from the active site and the C2-like domain of 5-LOX. CONCLUSIONS AND IMPLICATIONS C06 was identified as a potent selective direct 5-LOX inhibitor exhibiting a novel and unique mode of action, different from other established 5-LOX inhibitors. This thiazolinone may possess potential for intervention with inflammatory and allergic diseases and certain types of cancer.
Collapse
|
42
|
A processing scheme for time-variant phase analysis in EEG burst activity of premature and full-term newborns in quiet sleep: a methodological study. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-0034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
43
|
Adaptive Phase Extraction: Incorporating the Gabor Transform in the Matching Pursuit Algorithm. IEEE Trans Biomed Eng 2011; 58:2844-51. [DOI: 10.1109/tbme.2011.2160636] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
44
|
A toolbox for the upscaling of ethanolic human serum albumin (HSA) desolvation. Int J Pharm 2011; 414:225-32. [DOI: 10.1016/j.ijpharm.2011.04.046] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 04/08/2011] [Accepted: 04/16/2011] [Indexed: 10/18/2022]
|
45
|
A time-variant processing approach for the analysis of alpha and gamma MEG oscillations during flicker stimulus generated entrainment. IEEE Trans Biomed Eng 2011; 58:3069-77. [PMID: 21712153 DOI: 10.1109/tbme.2011.2160640] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Repetitive flicker stimulation (photic driving) offers the possibility to study the properties and coupling characteristics of stimulation-sensitive neuronal oscillators by means of the MEG/EEG analysis. With flicker frequencies in the region of the individual alpha band frequency, the dynamics of the entrainment process of the alpha oscillation, as well as the dynamics of the accompanying gamma oscillations and the coupling between the oscillations, are investigated by means of an appropriate combination of time-variant analysis methods. The Hilbert and the Gabor transformation reveal time-variant properties (frequency entrainment, phase locking, and n:m synchronization) of the entrainment process in the whole frequency range. Additionally, time-variant partial directed coherence is applied to identify ocular saccadic interferences and to study the directed information transfer between the recording sites of the simultaneously derived MEG/EEG data during the entrainment. The MEG data is the focus of this methodological study as the entrainment effects of the alpha oscillation are stronger in MEG than in the EEG. The occipital brain region (visual cortex) was mainly investigated and the dynamics of the alpha entrainment quantified. It can be shown that at the beginning of this entrainment, a transient, strongly phase-locked "40-Hz" gamma oscillation occurs.
Collapse
|
46
|
Time-variant analysis of linear and non-linear phase couplings of and between frequency components of EEG burst patterns in full-term newborns. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2011; 2010:1706-9. [PMID: 21096402 DOI: 10.1109/iembs.2010.5626845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Time-variant (tv) phase-locking and synchronization characteristics of and between low-frequency (≤ 1.5 Hz) and high-frequency EEG oscillations (≥ 3.5 Hz) of the tracé alternant (TA) pattern in full-term newborns have been quantified to explore the origin of quadratic phase coupling (QPC, as non-linear phase coupling measure) between the frequency ranges 1 - 1.5 Hz ⇔ 3.5 - 4.5 Hz, which characterize the specific interactions of oscillations during the TA's burst activity. Using the Gabor transformation two measures of linear phase coupling, the phase-locking index (PLI) and the n:m phase synchronization index (PSI) have been determined. Phase-locking within the frequency ranges 1 -1.5 Hz and 3.5 - 4.5 Hz, and synchronization between both frequency ranges exists. These phase characteristics are significant 2 sec after burst onset and are associated with the maximum-values of the QPC(1 - 1.5 Hz ⇔ 3.5 - 4.5 Hz) which demonstrates that a specific neuronal coordination between the dynamics of phases and of amplitude-frequency dependencies must be underlying.
Collapse
|
47
|
Time-variant analysis of phase couplings and amplitude–frequency dependencies of and between frequency components of EEG burst patterns in full-term newborns. Clin Neurophysiol 2011; 122:253-66. [DOI: 10.1016/j.clinph.2010.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 06/14/2010] [Accepted: 07/02/2010] [Indexed: 10/19/2022]
|
48
|
Targeted human serum albumin nanoparticles for specific uptake in EGFR-Expressing colon carcinoma cells. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2011; 7:454-63. [PMID: 21215330 DOI: 10.1016/j.nano.2010.12.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 12/06/2010] [Accepted: 12/17/2010] [Indexed: 12/31/2022]
Abstract
UNLABELLED The specific application and transport of drugs into malignant tissue is a critical point during diagnosis and therapy. Nanoparticles are known as excellent drug carrier systems and offer the possibility of surface modification with targeting ligands, leading to a specific accumulation in the targeted tissue. First, the specificity of such a carrier system has to be proven. In this study, cetuximab-modified nanoparticles based on biodegradable human serum albumin (HSA) are investigated regarding their cellular binding and intracellular accumulation. Different EGFR-expressing colon carcinoma cells were used to test possible cytotoxic potential, specific binding and intracellular accumulation. A specific accumulation targeting the EGFR could be shown. These results emphasize that cetuximab-modified HSA-nanoparticles are a promising carrier system for later drug transport. To our knowledge, this is the first study investigating the specific accumulation of HSA nanoparticles into different EGFR-expressing colon carcinoma cells. FROM THE CLINICAL EDITOR In this study, cetuximab-modified nanoparticles based on human serum albumin (HSA) are investigated regarding their cellular binding and intracellular accumulation. The results suggest that these nanoparticles are a promising carrier system for EGFR overexpressing colon carcinoma cells.
Collapse
|
49
|
Dynamics of directed interactions between brain regions during interburst–burst EEG patterns in quiet sleep of full-term neonates. Neurosci Lett 2011; 488:148-53. [DOI: 10.1016/j.neulet.2010.11.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2010] [Revised: 10/15/2010] [Accepted: 11/04/2010] [Indexed: 11/15/2022]
|
50
|
Photosensitizer loaded HSA nanoparticles II: in vitro investigations. Int J Pharm 2010; 404:308-16. [PMID: 21094228 DOI: 10.1016/j.ijpharm.2010.11.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 11/09/2010] [Accepted: 11/12/2010] [Indexed: 11/26/2022]
Abstract
The photosensitizing efficiency of human serum albumin (HSA) nanoparticles loaded with the photosensitizers meta-tetra(hydroxy-phenyl)-chlorin (mTHPC) and meta-tetra(hydroxy-phenyl)-porphyrin (mTHPP) was investigated in vitro. The endocytotic intracellular uptake, and the time dependent drug release caused by nanoparticle decomposition of the PS loaded HSA nanoparticles were studied on Jurkat cells in suspension. The photoxicity as well as the intracellular singlet oxygen ((1)O(2)) generation were investigated in dependence on the incubation time. The obtained results show that HSA nanoparticles are promising carriers for the clinical used mTHPC (Foscan). After release the ((1)O(2)) generation as well as the phototoxicity are more efficient compared with mTHPC applied without the HSA nanoparticles.
Collapse
|