Comstock C.E.S.,Thomas Jefferson University |
WonJeong K.,Gachon University |
Stallcup M.R.,University of Southern California |
McCue P.A.,Anatomy and Cell Biology |
Knudsen K.E.,Thomas Jefferson University
Clinical Cancer Research | Year: 2013
Purpose: BAF57, a component of the switching-defective and sucrose nonfermenting (SWI/SNF) chromatin-remodeling complex conglomerate, modulates androgen receptor activity to promote prostate cancer. However, the molecular consequences of tumor-associated BAF57 expression have remained undefined in advanced disease such as castration-resistant prostate cancer and/or metastasis. Experimental Design: Clinical human specimens of primary and metastatic prostate cancer were immunohistochemically examined for tumor-grade association of BAF57 expression. Global gene expression analyses were conducted in models mimicking tumor-associated BAF57 expression. Aberrant BAF57-dependent gene expression changes, bypass of androgen-mediated signaling, and chromatin-specific SWI/SNF complex alterations with respect to cytoskeletal remodelers such as integrins were validated. Cell migration assays were used to profile the biologic phenotypes conferred under conditions simulating tumorderived BAF57 expression. Results: Immunohistochemical quantitation of primary human specimens revealed that BAF57 was significantly and aberrantly elevated as a function of tumor grade. Critically, gene expression analyses showed that BAF57 deregulation circumvented androgen-mediated signaling, elicited α2 integrin upregulation, and altered other SWI/SNF complex components at the α2 integrin locus. BAF57-dependent α2 integrin induction conferred a prometastatic migratory advantage, which was attenuated by anti-α2 integrin antibody blockade. Furthermore, BAF57 was found to be markedly upregulated in human prostate cancer metastases of the lung, lymph node, and dura. Conclusion: The findings herein, identifying tumor-associated BAF57 perturbation as a means to bypass androgen-signaling events that facilitate novel prometastatic phenotypes, link BAF57 upregulation to tumor dissemination. These data thereby establish BAF57 as a putative marker of metastatic potential that could be leveraged for therapeutic intervention. © 2013 AACR.
Tian L.,University of Pennsylvania |
Huang K.,University of Pennsylvania |
Duhadaway J.B.,Lankenau Institute for Medical Research |
Prendergast G.C.,Anatomy and Cell Biology |
And 2 more authors.
Current Eye Research | Year: 2010
Purpose: Many miRNAs are expressed in a developmentally regulated and tissue-specific manner making them crucial for tissue development in a structure such as the eye. Since miRNA target function studies for the eye will need to be performed in ocular tissue culture cells, it is important to profile them for miRNA expression. Two commonly used human lens epithelial cell lines, HLE-B3 and SRA01/04, were profiled for miRNA. Materials and Methods: We performed miRNA profiling of two commonly used lens epithelial cell lines, HLE-B3 and SRA01/04. The differential expression levels detected for miR-184 and miR-31 were confirmed by qRT-PCR and the function of a predicted miR-184 target binding site was validated in-vitro. Results: We found that four miRNAsmiR-31, miR-124, miR-184, and miR-222were differentially expressed between the two cell lines. We show that miR-184 binds to BIN3 3′ UTR and while BIN3 mRNA expression was equal in both cell lines, the protein expression was inversely correlated with miR-184 expression. Conclusion: The differences observed with respect to miRNA expression between two different lens epithelial cell lines were minimal. Still, caution will need to be exercised when choosing one cell line over another because of the expression differences for some miRNAs. Our results also suggest that miR-184 may regulate lens BIN3 expression in lens by a miRNA-mediated translational repression mechanism. © 2010 Informa Healthcare USA, Inc.
Brown J.M.,University of California at San Diego |
Barbe M.F.,University of California at San Diego |
Albo M.E.,Anatomy and Cell Biology |
Lai H.H.,University of Washington |
And 2 more authors.
Journal of Neurosurgery: Spine | Year: 2012
Object. Nerve transfers are effective for restoring control to paralyzed somatic muscle groups and, recently, even to denervated detrusor muscle in a canine model. A pilot project was performed in cadavers to examine the feasibility of transferring somatic nerves to vesical branches of the pelvic nerve as a method for potentially restoring innervation to control the detrusor muscle in humans. Methods. Eleven cadavers were dissected bilaterally to expose intercostal, ilioinguinal, and iliohypogastric nerves, along with vesical branches of the pelvic nerve. Ease of access and ability to transfer the former 3 nerves to the pelvic vesical nerves were assessed, as were nerve cross-sectional areas. Results. The pelvic vesical nerves were accessed at the base of the bladder, inferior to the ureter and accompanied by inferior vesical vessels. The T-11 and T-12 intercostal nerves were too short for transfer to the pelvic vesical nerves without grafting. Ilioinguinal and iliohypogastric nerves (L-1 origin) were identified retroperitoneally and, with full dissection, were easily transferred to the pelvic vesical nerves intraabdominally. The mean cross-sectional area of the dominant pelvic vesical branch was 2.60 ± 0.169 mm2; ilioinguinal and iliohypogastric branches at the suggested transection site were 2.38 ± 0.32 mm2 (the means are expressed ± SEM). Conclusions. Use of the ilioinguinal or iliohypogastric nerves for heterotopic transfer to pelvic vesical nerves is surgically feasible, based on anatomical location and cross-sectional areas.
Sue Menko A.,Anatomy and Cell Biology |
Andley U.P.,University of Washington
Experimental Eye Research | Year: 2010
α-Crystallins are small heat-shock proteins important to lens transparency that provide the lens with its refractive properties. In their role as molecular chaperones, these crystallins also prevent protein aggregation, affect cytoskeletal remodeling, enhance resistance to cell stress, and provide lens cells with protection against apoptosis. While many of the functions assigned to αA-crystallin are attributable to its presence in the cytoplasm of lens cells, αA-crystallin also has been detected at the lens plasma membrane. However, how αA-crystallin becomes linked to the plasma membrane or what its functions are at this site has remained unknown. In this study, we examined the mechanisms by which αA-crystallin becomes associated with the lens membrane, focusing specifically on its interaction with membrane receptors, and the differentiation-specificity of these interactions. We also determined how the long-term absence of αA-crystallin alters receptor-linked signaling pathways. αA-crystallin association with membrane receptors was determined by co-immunoprecipitation analysis; its membrane localization was examined by confocal imaging; and the effect of αA-crystallin loss-of-function on the activation state of signaling molecules in pathways linked to membrane receptors was determined by immunoblot analysis. The results show that, in lens epithelial cells, plasma membrane αA-crystallin was primarily localized to apicolateral borders, reflecting the association of αA-crystallin with E-cadherin complexes. These studies also provide the first evidence that αA-crystallin maintained its association with the plasma membrane in lens cortical fiber cells, where it was localized to lateral interfaces, and further show that this association was mediated, in part, by αA-crystallin interaction with α6 integrin receptor complexes. We report that the absence of αA-crystallin led to constitutive activation of the stress kinases p38 and JNK, classical inducers of apoptotic cell death, and the loss of the phospho-Bad pro-survival signal, effects that were greatest in differentiating lens fiber cells. Concurrent with this, activation of FAK and ERK kinases was increased, demonstrating that these receptor-linked pathways also were dysregulated in the absence of αA-crystallin. These data link αA-crystallin plasma membrane association to its differentiation-state-specific interaction with E-cadherin and α6 integrin receptor complexes. The changes in cell signaling in αA-crystallin-null lenses suggest that dysregulation of receptor-linked cell-signaling pathways that accompany the failure of αA-crystallin to associate with membrane receptors may be responsible for the induction of apoptosis. The observed changes in lens cell signaling likely reflect long-term functional adaptations to the absence of the αA-crystallin chaperone/small heat-shock protein. © 2010 Elsevier Ltd.
Gulati G.,Anatomy and Cell Biology |
Gulati G.,Thomas Jefferson University |
Hevelow M.,Foundation Medicine |
George M.,Anatomy and Cell Biology |
And 5 more authors.
Archives of Pathology and Laboratory Medicine | Year: 2011
Context.-The key question when managing patients on warfarin therapy who present with life-threatening bleeding is how to use the international normalized ratio (INR) to best direct corrective therapy. The corollary question for the clinical laboratory is at what level will the INR reflect a critical value that requires notifying the clinician. Objective.-To determine the levels of vitamin K-dependent factors over a range of INR values. Design.-Evaluation of the vitamin K-dependent coagulation factor levels on plasma remnants from patients in whom a prothrombin time and INR was ordered to monitor warfarin therapy. There were a total of 83 specimens evaluated with an INR range from 1.0 to 8.26. Results.-The mean activity levels of all 4 factors remained near or above 50% when the INR was less than 1.5. The average factor X level was 23% when the INR range was 1.6 to 2.5, but levels of factors II, VII, and IX did not drop below the hemostatic range until the INR was greater than 2.5. At an INR of 3.6 or more, the activity levels of all 4 factors were less than 30% in more than 90% of the specimens. Conclusion.-Levels of factors II, VII, IX, and X declined with increasing INR but not at the same rate and not to the same level at a given INR. However, most of the values were below the hemostatic value once the INR was 3.6 or more, the level that was also considered critical for physician notification.