20 research outputs found
hTID-1 defines a novel regulator of c-Met Receptor signaling in renal cell carcinomas
The c-Met receptor tyrosine kinase (MetR) is frequently overexpressed and constitutively phosphorylated in a number of human malignancies. Activation of the receptor by its ligand, hepatocyte growth factor (HGF), leads to increased cell proliferation, motility, survival and disruption of adherens junctions. In this study, we show that hTid-1, a DNAJ/Hsp40 chaperone, represents a novel modulator of the MetR signaling pathway. hTid-1 is a co-chaperone of the Hsp70 family of proteins, and has been shown to regulate a number of cellular signaling proteins including several involved in tumorigenic and apoptotic pathways. In this study we demonstrate that hTid-1 binds to unphosphorylated MetR and becomes dissociated from the receptor upon HGF stimulation. Overexpression of the short form of hTid-1 (hTid-1S) in 786-0 renal clear cell carcinomas (RCCs) enhances MetR kinase activity leading to an increase in HGF-mediated cell migration with no discernible effect on cell proliferation. By contrast, knockdown of hTid-1 markedly impairs both the onset and amplitude of MetR phosphorylation in response to HGF without altering receptor protein levels. hTid-1-depleted cells display defective migratory properties, coincident with inhibition of ERK/MAP kinase and STAT3 pathways. Taken together, our findings denote hTid-1S as an essential regulatory component of MetR signaling. We propose that the binding of hTid-1S to MetR may stabilize the receptor in a ligand-competent state and this stabilizing function may influence conformational changes that take place during the catalytic cycle that promote kinase activation. Given the prevalence of HGF/MetR pathway activation in human cancers, targeted inhibition of hTid-1 may be a useful therapeutic in the management of MetR-dependent malignancies
Sexual activity and function in women with and without pelvic floor disorders
We describe differences in sexual activity and function in women with and without pelvic floor disorders (PFDs)
Protection of 5′‐Hydroxy Functions of Nucleosides
The 5‐hydroxy group is the primary hydroxy group of nucleosides. It is mandatory to protect 5‐hydroxyls in all methods of oligonucleotide synthesis that require nucleoside synthons. This unit discusses a wide variety of acid‐labile and base‐labile protecting groups, as well as enzymatic methods for 5‐protection and deprotection.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143732/1/cpnc0203.pd
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Recruitment and retention: A randomized controlled trial of video-enhanced versus standard consent processes within the E-OPTIMAL study.
Background/aimsIn this study, we compared two research consent techniques: a standardized video plus usual consent and usual consent alone.MethodsIndividuals who completed 24-month outcomes (completers) in the Operations and Pelvic Muscle Training in the Management of Apical Support Loss study were invited to participate in an extended, longitudinal follow-up study (extended Operations and Pelvic Muscle Training in the Management of Apical Support Loss). Potential participants who were (1) able to provide consent and (2) not in long-term care facilities were randomized 1:1 to a standardized video detailing the importance of long-term follow-up studies of pelvic floor disorders followed by the usual institutional consent process versus the usual consent process alone. Randomization, stratified by site, used randomly permuted blocks. The primary outcome was the proportion of participants who enrolled in the extended study and completed data collection events 5 years after surgery. Secondary outcomes included the proportion enrolled in the extended study, completion of follow-up at each study year, completion of data collection points, completion of in-person visits, and completion of quality of life calls. Motivation and barriers to enrollment (study-level and personal-level) and satisfaction with the study consent process were measured by questionnaire prior to recruitment into extended Operations and Pelvic Muscle Training in the Management of Apical Support Loss. Groups were compared using an intention-to-treat principle, using unadjusted Student's t-test (continuous) and chi-square or Fisher's exact (categorical) test. A sample size of 340 (170/group) was estimated to detect a 15% difference in enrollment and study completion between groups with p < 0.05.ResultsOf the 327 Operations and Pelvic Muscle Training in the Management of Apical Support Loss completers, 305 were randomized to the consent process study (153 video vs 152 no video). Groups were similar in demographics, surgical treatment, and outcomes. The overall rate of extended study enrollment was high, without significant differences between groups (video 92.8% vs no video 94.1%, p = 0.65). There were no significant differences in the primary outcome (video 79.1% vs no video 75.7%, p = 0.47) or in any secondary outcomes. Being "very satisfied" overall with study information (97.7% vs 88.5%, p = 0.01); "strong agreement" for feeling informed about the study (81.3% vs 70.8%, p = 0.06), understanding the study purpose (83.6% vs 71.0%, p = 0.02), nature and extent (82.8% vs 70.2%, p = 0.02), and potential societal benefits (82.8% vs 67.9%, p = 0.01); and research coordinator/study nurse relationship being "very important" (72.7% vs 63.4%, p = 0.03) were better in the video compared to the no video consent group.ConclusionThe extended study had high enrollment; most participants completed most study tasks during the 3-year observational extension, regardless of the use of video to augment research consent. The video was associated with a higher proportion of participants reporting improved study understanding and relationship with study personnel