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| Silencing Of Directional Migration In R... | Chiropractic and Osteopathy | |
| Background: Roundabouts are axon guidance molecules that have recently been identified to play a role in vascular guidance as well. In this study, we investigated gene knockdown analysis of roundabout 4 (robo4), the predominant Robo in endothelial cells using small interfering RNA technology in vitro. Results: Robo4 knockdown abrogated the chemotactic response of endothelial cells to serum but enhanced a chemokinetic response to slit2. Robo4 knockdown endothelial cells unexpectedly show up regulation of Rho GTPases. Zebrafish robo4 rescues both Rho GTPase homeostasis and serum induced chemotaxis in robo4 knockdown cells. In addition, this study mechanistically implicates IRSp53 in the signaling nexus between activated Cdc42 and Mena, both of which have previously been shown to be involved with robo4 signaling in endothelial cells. Conclusions: This work for the first time provides components of the robo4 signaling apparatus that work together to guide directional migration of endothelial cells. |
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| Donor age and cell passage affects diff... | Chiropractic and Osteopathy | |
| Background: Bone marrow-derived mesenchymal stem cells (BMSCs) are a widely researched adult stem cell population capable of differentiation into various lineages. Because many promising applications of tissue engineering require cell expansion following harvest and involve the treatment of diseases and conditions found in an aging population, the effect of donor age and ex vivo handling must be understood in order to develop clinical techniques and therapeutics based on these cells. Furthermore, there currently exists little understanding as to how these two factors may be influenced by one another. Results: Differences in the adipogenic, chondrogenic, and osteogenic differentiation capacity of murine MSCs harvested from donor animals of different age and number of passages of these cells were observed. Cells from younger donors adhered to tissue culture polystyrene better and proliferated in greater number than those from older animals. Chondrogenic and osteogenic potential decreased with age for each group, and adipogenic differentiation decreased only in cells from the oldest donors. Significant decreases in differentiation potentials due to passage were observed as well for osteogenesis of BMSCs from the youngest donors and chondrogenesis of the cells from the oldest donors. Conclusion: Both increasing age and the number of passages have lineage dependent effects on BMSC differentiation potential. Furthermore, there is an obvious interplay between donor age and cell passage that in the future must be accounted for when developing cell-based therapies for clinical use. |
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| Aggresomes do not represent a general c... | Chiropractic and Osteopathy | |
| Background: Aggresomes are juxtanuclear inclusion bodies that have been proposed to represent a general cellular response to misfolded proteins in mammalian cells. Yet, why aggresomes are not a pathological characteristic of protein misfolding diseases is unclear. Here, we investigate if a misfolded protein inevitably forms aggresomes in mammalian cells. Results: We show that a cytoplasmic form of the prion protein may form aggresomes or dispersed aggregates in different cell lines. In contrast to aggresomes, the formation of dispersed aggregates is insensitive to histone deacetylase 6 inhibitors and does not result in cytoskeleton rearrangements. Modulation of expression levels or proteasome inhibitors does not alter the formation of dispersed aggregates. Conclusion: Our results establish that aggresomes are not obligatory products of protein misfolding in vivo. |
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| Un moment historique pour le système de... | Chiroblog | |
| C’est aujourd’hui que le président de la république française, Nicolas Sarkozy, est venu au Québec afin de signer l’accord, concernant les questions de mobilité de la main-d’oeuvre, qui permettra aux professionnels du Québec et de la France de jouir d’une liberté de pouvoir pratiquer leur profession dans un pays comme dans l’autre. À visionner absolument, les discours du [...] |
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| A role for SNX5 in the regulation of ma... | Chiropractic and Osteopathy | |
| Background: The mechanisms and components that regulate macropinocytosis are poorly understood. Here we have investigated the role of sorting nexin 5 (SNX5) in the regulation of macropinocytic activity. Results: SNX5 is abundantly expressed in macrophages, cells very active in macropinocytosis, and is recruited onto newly-formed macropinosomes. LPS treatment of bone marrow-derived macrophages resulted in a 2.5 fold decrease in macropinosome formation that correlates with a reduction in the levels of SNX5. To investigate the relationship between SNX5 levels and macropinocytic activity we examined the formation of macropinosomes in HEK-FlpIn cells stably expressing GFP-SNX5. Constitutive macropinocytosis was increased ~2 fold in HEK-GFP-SNX5 cells compared with parental HEK-FlpIn cells. Furthermore, EGF stimulation resulted in a significant increase in macropinocytosis and there was also a 2.0 fold increase in the generation of macropinosomes in HEK-GFP-SNX5 cells compared with parental HEK-FlpIn cells. SNX5, which interacts specifically with PtdIns(3)P and PtdIns(3,4)P2 through its PX domain, was recruited to regions on the plasma membrane containing EGF receptor or positive for PtdIns(3,4)P2 as detected with the PH domain of TAPP1. Treatment with AG1478, an EGF receptor specific tyrosine kinase inhibitor, prevented the recruitment of SNX5 to the cytosolic face of the plasma membrane and inhibited the formation of macropinosomes in response to EGF treatment. Conclusion: Based on these data, we propose that SNX5 requires the generation of phosphoinositides for recruitment to the plasma membrane and, moreover, influences the level of macropinocytic activity. |
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| N-Glycosylation of the alpha subunit do... | Chiropractic and Osteopathy | |
| Background: The organic solute transporter (OST?-OST?) is a heteromeric transporter that is expressed on the basolateral membrane of epithelium in intestine, kidney, liver, testis and adrenal gland and facilitates efflux of bile acids and other steroid solutes. Both subunits are required for plasma membrane localization of the functional transporter but it is unclear how and where the subunits interact and whether glycosylation is required for functional activity. We sought to examine these questions for the human OST?-OST? transporter using the human hepatoma cell line, HepG2, and COS7 cells transfected with constructs of human OST?-FLAG and OST?-Myc. Results: Tunicamycin treatment demonstrated that human OST? is glycosylated. In COS7 cells Western blotting identified the unglycosylated form (~31 kD), the core precursor form (~35 kD), and the mature, complex glycoprotein (~40 kD). Immunofluorescence of both cells indicated that, in the presence of OST?, the alpha subunit could still be expressed on the plasma membrane after tunicamycin treatment. Furthermore, the functional uptake of 3H-estrone sulfate was unchanged in the absence of N-glycosylation. Co-immunoprecipitation indicates that the immature form of OST? interact with OST?. However, immunoprecipitation of OST? using an anti-Myc antibody did not co-precipitate the mature, complex glycosylated form of OST?, suggesting that the primary interaction occurs early in the biosynthetic pathway and may be transient. Conclusion: In conclusion, human OST? is a glycoprotein that requires interaction with OST? to reach the plasma membrane. However, glycosylation of OST? is not necessary for interaction with the beta subunit or for membrane localization or function of the heteromeric transporter. |
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| Dynamic Chiropractic - Palmer West Rec... | Dynamic Chiropractic | |
| October 7, 2008 -- NEWS IN BRIEF The National Committee for Quality Assurance (NCQA), a private, nonprofit organization dedicated to improving health care quality,... | ||
| Dynamic Chiropractic - DC Starts Nonpr... | Dynamic Chiropractic | |
| October 7, 2008 -- Beatrice Tapia, DC, has cofounded the Wishing You Well Foundation, an organization dedicated to conducting outcome studies on the benefit of... | ||
| Dynamic Chiropractic - Where's the... | Dynamic Chiropractic | |
| October 7, 2008 -- It is difficult to attend a chiropractic meeting without encountering some discussion of evidence-based practice. The concept is simple and as old as... | ||
| Dynamic Chiropractic - It IS What You ... | Dynamic Chiropractic | |
| October 7, 2008 -- As I review various research studies each week, I can't help but notice they fall into two camps: drugs or wellness. By wellness, I refer to the... | ||
| Dynamic Chiropractic - Politics - Can ... | Dynamic Chiropractic | |
| Study Reveals Chiropractic Care Actuall... | Chiroblog | |
| Intérêts économiques de la prise en cha... | Chiroblog | |
| Chirotag.com revampé ! | Chiroblog | |
| Risques d?accidents vasculaires & chiro... | Chiroblog | |
| L?Organisation Mondiale de la Santé aff... | Chiroblog | |
| Recherche chiropratique | Chiroblog | |
| Nouvelle recherche sur la relation entr... | Chiroblog | |
| Honoraires | SOS Hernie Discale | |
| Comment devenir un patient ? | SOS Hernie Discale | |
| Statistiques concernant les maux de dos | SOS Hernie Discale | |
| Statistiques sur la décompression verté... | SOS Hernie Discale | |
| Evidence-informed management of chronic... | Chiroblog | |
| Un traitement révolutionnaire pour le S... | Chiroblog | |
| Diagnostic de la hernie discale | SOS Hernie Discale | |
| Des professionnels dévoués | SOS Hernie Discale | |
| La décompression vertébrale démystifiée | SOS Hernie Discale | |
| ACA to Mobilize Chiropractic Patients i... | American Chiropractic Association | |
| American Chiropractic Association Recog... | American Chiropractic Association | |
| American Chiropractic Association Names... | American Chiropractic Association | |
| American Chiropractic Association Prese... | American Chiropractic Association | |
| American Chiropractic Association Names... | American Chiropractic Association | |
