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The connexin 43 (Cx43) hemichannel (HC) in the mechanosensory osteocytes is a major portal for the release of factors responsible for the anabolic effects of mechanical loading on bone formation and remodeling. However, little is known about how the Cx43 molecule responds to mechanical stimulation leading to the opening of the HC. Here, we demonstrate that integrin α5β1 interacts directly with Cx43 and that this interaction is required for mechanical stimulation-induced opening of the Cx43 HC. Direct mechanical perturbation via magnetic beads or conformational activation of integrin α5β1 leads to the opening of the Cx43 HC, and this role of the integrin is independent of its association with an extracellular fibronectin substrate. PI3K signaling is responsible for the shear stress-induced conformational activation of integrin α5β1 leading to the opening of the HC. These results identify an unconventional function of integrin that acts as a mechanical tether to induce opening of the HC and provide a mechanism connecting the effect of mechanical forces directly to anabolic function of the bone.

Surgical resection remains the treatment of choice for anatomically resectable non-small cell lung cancer. However, the presence of associated comorbid conditions increases the risk of death and surgical complications. Several studies have evaluated the usefulness of preoperative exercise testing for predicting postoperative morbidity and mortality. The aim of this study was to establish whether exercise testing could predict poor surgical outcome in lung cancer surgery and whether the absolute value or percentage of predicted value is the better predictor of the surgical outcome The study was designed as a prospective study One hundred thirty patients with potentially operable lung cancer at Papworth Hospital over 2 years were recruited; of these, 101 underwent curative surgery Spirometry and cardiopulmonary exercise tests were performed for every patient (n = 99), except for two patients with back problems. We also recorded the outcome of surgery, in particular, complications and mortality Mean maximum oxygen transport at peak exercise ( V.o2peak) was 18.3 mL/kg/min (SD, 4.7 mL/kg/min), and mean percentage of predicted V.o2peak value was 84.4% (SD, 30%). Poor surgical outcome was significantly related to V.o2peak percentage of predicted (p < 0.01) but not to the actual oxygen uptake value The use of the percentage of predicted V.o2peak value would be a better indicator of surgical outcome, since it predicts the surgical outcome better, and corrects for normal physiologic ranges. The threshold of V.o2peak for surgical intervention could be set between 50% and 60% of predicted without excess surgical mortality

Study objectives: Surgical resection remains the treatment of choice for anatomically resectable non-small cell lung cancer. However, the presence of associated comorbid conditions increases the risk of death and surgical complications. Several studies have evaluated the usefulness of preoperative exercise testing for predicting postoperative morbidity and mortality. The aim of this study was to establish whether exercise testing could predict poor surgical outcome in lung cancer surgery and whether the absolute value or percentage of predicted value is the better predictor of the surgical outcome. Design: The study was designed as a prospective study. Patients and setting: One hundred thirty patients with potentially operable lung cancer at Papworth Hospital over 2 years were recruited; of these, 101 underwent curative surgery. Interventions: Spirometry and cardiopulmonary exercise tests were performed for every patient (n = 99), except for two patients with back problems. We also recorded the outcome of surgery, in particular, complications and mortality. Measurements and results: Mean maximum oxygen transport at peak exercise (V̇ o 2 peak) was 18.3 mL/kg/min (SD, 4.7 mL/kg/min), and mean percentage of predicted V̇ o 2 peak value was 84.4% (SD, 30%). Poor surgical outcome was significantly related to V̇ o 2 peak percentage of predicted (p < 0.01) but not to the actual oxygen uptake value. Conclusions: The use of the percentage of predicted V̇ o 2 peak value would be a better indicator of surgical outcome, since it predicts the surgical outcome better, and corrects for normal physiologic ranges. The threshold of V̇ o 2 peak for surgical intervention could be set between 50% and 60% of predicted without excess surgical mortality.

The connexin 43 (Cx43) hemichannel (HC) in the mechanosensory osteocytes is a major portal for the release of factors responsible for the anabolic effects of mechanical loading on bone formation and remodeling. However, little is known about how the Cx43 molecule responds to mechanical stimulation leading to the opening of the HC. Here, we demonstrate that integrin α5β1 interacts directly with Cx43 and that this interaction is required for mechanical stimulation-induced opening of the Cx43 HC. Direct mechanical perturbation via magnetic beads or conformational activation of integrin α5β1 leads to the opening of the Cx43 HC, and this role of the integrin is independent of its association with an extracellular fibronectin substrate. PI3K signaling is responsible for the shear stress-induced conformational activation of integrin α5β1 leading to the opening of the HC. These results identify an unconventional function of integrin that acts as a mechanical tether to induce opening of the HC and provide a mechanism connecting the effect of mechanical forces directly to anabolic function of the bone. [PUBLICATION ABSTRACT]

The purpose of this quantitative correlational study was to determine the relationships between motivators used with cyber school students with disabilities and their ability to independently initiate and complete required tasks. These relationships were evaluated by a quantitative correlational study with a linear regression approach. Analysis of the quantitative study was to identify how motivators supported students with disabilities in cyber courses. Eight regular and special education teachers in a public school in Central Pennsylvania were chosen to complete an online survey. Originally, contacts were made to recruit 61 schools. Many superintendents or Chief Executive Officers (CEOs) denied permission to perform the research. The research was therefore tailored to the one institution that granted permission. The questions for the research are: What is the relationship between motivators used by students to initiate required tasks and outcome performances? and What is the relationship between motivators used by students to complete required tasks and outcome performances? There no statistically significant relationship between motivators used in cyber courses and students’ ability to initiate or complete tasks and outcome performances. The null hypothesis was not rejected, and the alternative hypothesis was rejected. The reason these motivators were researched and evaluated was to determine if intrinsic or extrinsic motivators could be used as scaffolds to improve outcomes for online learners. Some recommendations generated by this study for future studies are to reach a broader geographical area to recruit participants, eliminate problematic inferences with the recruitment process, and to obtain permission to conduct the study in a timely manner.

Osteocytes are thought to be the mechanosensors in bone. The MLO-Y4 cell line has been established and characterized to provide a model in which to study osteocyte properties and functions. They express large amounts of the protein connexin 43 (Cx43), which forms hemichannels on the cell surface. Integrins are also expressed on the cell surface where they are proposed to be mechanical sensors that convey the signals elicited by mechanical stress in many cell types, including osteocytes. We report here that functions of Cx43-hemichannels are closely regulated by mechanical stimulation, causing the opening of hemichannels and release of prostaglandin E2 (PGE 2), an important bone modulator. Both of which were magnitude-dependent, that is increasing response to increased fluid flow shear stress (FFSS). Hemichannels are dynamic, gradually closed over time during post-stress periods and becoming increasingly \"desensitized\" to continuous shear. However, allowing a rest period between mechanical loadings enhanced the hemichannel response. Using a potent hemichannel blocking antibody, developed in our laboratory, significantly inhibited the opening of hemichannels and release of PGE2 induced by FFSS, suggesting the direct involvement of Cx43 in forming functional hemichannels. We found that regulation of Cx43-hemichannels by mechanical stimulation is facilitated by its interaction with α5 integrin. Immunofluorescence microscopy and reciprocal co-immunoprecipitation experimental results show that α5 integrin associates with Cx43. α5 integrin blocking antibody or knockdown of α5 integrin in MLO-Y4 cells by siRNA inhibited the opening of hemichannels induced by FFSS, as measured by dye uptake, and α5 integrin siRNA caused a change in the intracellular distribution pattern of Cx43. Together, these results imply hemichannels formed by Cx43 are tightly regulated by mechanical stimulation and α5 integrin functions as a regulator for the opening of Cx43-forming hemichannels in response to mechanical stress. Establishing the novel role(s) that α5 integrin plays in the regulation of hemichannel activities will reveal a major mechanism for osteocyte signaling in response to mechanical stress, and may provide potential therapeutic targets for treatment of bone diseases.

I would like to say to [Conrad Black] -- please, do not ever feel you need to meet the criteria for Canadian citizenship. Canada does not need you. Your vision is individualistic and personal, arrogant and self-serving. Unlike [Bill Clinton], you do not see the global picture, only one that has your best interests and those of your board of directors at heart.