Browsing by Subject "Preclinical studies"

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    Acute High Dietary Phosphorus Following Low-Phosphorus Diet Acclimation Does Not Enhance Intestinal Fractional Phosphorus Absorption in Nephrectomized Male Rats
    (Wiley, 2022-11-16) Burstad, Kendal M.; Cladis, Dennis P.; Vorland, Colby J.; Wastney, Meryl E.; Biruete, Annabel; Dominguez, James M., II; O’Neill, Kalisha D.; Chen, Neal X.; Moe, Sharon M.; Hill Gallant, Kathleen M.; Medicine, School of Medicine
    Dietary phosphorus restriction and phosphorus binders are commonly prescribed for patients with chronic kidney disease (CKD). However, occurrences of non-adherence to these interventions are common. As low-phosphorus (LP) diets have been consistently experimentally shown in vitro to increase intestinal phosphorus absorption efficiency, a bout of non-adherence to diet or binders may cause an unintended consequence of enhanced intestinal phosphorus absorption. Thus, we aimed to determine the effect of a single bout of high-phosphorus (HP) intake after acclimation to a LP diet. Male Sprague Dawley rats with 5/6 nephrectomy (n = 36) or sham operation (n = 36) were block-randomized to 1 of 3 diets: LP (0.1% P w/w), HP (1.2%), or LP followed by acute HP (LPHP 0.1% then 1.2%). Phosphorus absorption tests were conducted using 33P radioisotope administrated by oral gavage or intravenously (iv). Although the overall two-way ANCOVA model for intestinal fractional phosphorus absorption was non-significant, exploratory comparisons showed intestinal fractional phosphorus absorption efficiency tended to be higher in rats in the LP compared with HP or LPHP groups. Rats in the HP or LPHP groups had higher plasma phosphorus compared with rats in the LP group, but the LPHP group was not different from the HP group. Gene expression of the major intestinal phosphate transporter, NaPi-2b, was lower in the jejunum of rats in the LPHP group compared with rats in the HP group but not different in the duodenum. These results demonstrate that an acute HP load after acclimation to a LP diet does not lead to enhanced intestinal fractional phosphorus absorption efficiency in 5/6 nephrectomized male rats. These data provide evidence against the notion that dietary phosphorus restriction or binder use adversely increases absorption efficiency after a single instance of dietary or binder non-adherence. However, other adverse consequences of fluctuating dietary phosphorus intake cannot be ruled out.
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    Editorial Peer Reviewers as Shepherds, Rather Than Gatekeepers
    (Wiley, 2021) Boerckel, Joel D.; Plotkin, Lilian I.; Sims, Natalie A.; Anatomy, Cell Biology and Physiology, School of Medicine
    The journals of the American Society for Bone and Mineral Research (the Journal of Bone and Mineral Research [JBMR] and its sister journal JBMR Plus) recognize peer review, whether pre- or post-publication, as an essential guard of scientific integrity and rigor that shapes academic discourse in our field. In this Perspective, we present a vision and philosophy of peer review in a rapidly changing publishing landscape. We emphasize the importance of journal peer reviewers as active players in shaping collegial behavior in the musculoskeletal research community and provide information about benefits and resources available for reviewers and reviewers-in-training. Publishing is becoming increasingly transparent, bringing benefits to authors, to reviewers, and to the scientific community at large. We discuss new initiatives such as transparent peer review and preprint servers, the ways they are changing scientific publishing, and how JBMR is responding to broaden the impact of musculoskeletal research. We emphasize the need to change any perception of peer reviewers as gatekeepers to viewing them as shepherds, who partner with authors and editors in the publishing endeavor. Promoting access, transparency, and collegiality in the way we assess science in our community will elevate its quality, clarify its communication, and increase its societal impact. © 2021 American Society for Bone and Mineral Research (ASBMR).