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Hagan ML, Tuladhar A, Yu K, Alhamad DW, Bensreti H, Dorn J, Piedra VM, Cantu N, Stokes EG, Blumenthal D, Roberts RL, Balayan V, Bass SM, Dickerson T, Cartelle AL, Montesinos-Cartagena M, Awad ME, Castro AA, Garland T, Cooley MA, Johnson M, Hamrick MW, McNeil PL, McGee-Lawrence ME. Osteocyte Sptbn1 Deficiency Alters Cell Survival and Mechanotransduction Following Formation of Plasma Membrane Disruptions (PMD) from Mechanical Loading. Calcif Tissue Int 2024:10.1007/s00223-024-01285-2. [PMID: 39276238 DOI: 10.1007/s00223-024-01285-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Accepted: 08/30/2024] [Indexed: 09/16/2024]
Abstract
We and others have shown that application of high-level mechanical loading promotes the formation of transient plasma membrane disruptions (PMD) which initiate mechanotransduction. We hypothesized that increasing osteocyte cell membrane fragility, by disrupting the cytoskeleton-associated protein β2-spectrin (Sptbn1), could alter osteocytic responses and bone adaptation to loading in a PMD-related fashion. In MLO-Y4 cells, treatment with the spectrin-disrupting agent diamide or knockdown of Sptbn1 via siRNA increased the number of PMD formed by fluid shear stress. Primary osteocytes from an osteocyte-targeted DMP1-Cre Sptbn1 conditional knockout (CKO) model mimicked trends seen with diamide and siRNA treatment and suggested the creation of larger PMD, which repaired more slowly, for a given level of stimulus. Post-wounding cell survival was impaired in all three models, and calcium signaling responses from the wounded osteocyte were mildly altered in Sptbn1 CKO cultures. Although Sptbn1 CKO mice did not demonstrate an altered skeletal phenotype as compared to WT littermates under baseline conditions, they showed a blunted increase in cortical thickness when subjected to an osteogenic tibial loading protocol as well as evidence of increased osteocyte death (increased lacunar vacancy) in the loaded limb after 2 weeks of loading. The impaired post-wounding cell viability and impaired bone adaptation seen with Sptbn1 disruption support the existence of an important role for Sptbn1, and PMD formation, in osteocyte mechanotransduction and bone adaptation to mechanical loading.
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Affiliation(s)
- Mackenzie L Hagan
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Anik Tuladhar
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Kanglun Yu
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Dima W Alhamad
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Husam Bensreti
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Jennifer Dorn
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Victor M Piedra
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Nicholas Cantu
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Eric G Stokes
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Daniel Blumenthal
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Rachel L Roberts
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Vanshika Balayan
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Sarah M Bass
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Thomas Dickerson
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Anabel Liyen Cartelle
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Marlian Montesinos-Cartagena
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Mohamed E Awad
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - Alberto A Castro
- Evolution Ecology & Organismal Biology Department, University of California Riverside, Riverside, USA
| | - Theodore Garland
- Evolution Ecology & Organismal Biology Department, University of California Riverside, Riverside, USA
| | - Marion A Cooley
- Department of Oral Biology and Diagnostic Sciences, Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - Maribeth Johnson
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Augusta University, Augusta, GA, USA
| | - Mark W Hamrick
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Paul L McNeil
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA
| | - Meghan E McGee-Lawrence
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Augusta University, 1460 Laney Walker Blvd, CB1101, Augusta, GA, 30912, USA.
- Department of Orthopaedic Surgery, Augusta University, Augusta, GA, USA.
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Morgan TJ, Garland T, Carter PA. Ontogenies in mice selected for high voluntary wheel-running activity. I. Mean ontogenies. Evolution 2003; 57:646-57. [PMID: 12703954 DOI: 10.1111/j.0014-3820.2003.tb01556.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The evolutionary importance of postnatal ontogenies has long been recognized, but most studies of ontogenetic trajectories have focused exclusively on morphological traits. For animals, this represents a major omission because behavioral traits and their ontogenies often have relatively direct relationships to fitness. Here four replicate lines of house mice artificially selected for high early-age wheel running and their four replicate control lines were used to evaluate the effects of early-age directional selection, genetic drift, and activity environment (presence or absence of a running wheel) on variation in the ontogenies of three traits known to be genetically correlated: voluntary wheel running, body mass, and food consumption. Early-age selection significantly changed both the shape and position of the wheel-running and food-consumption ontogenies while influencing the position, but not the shape, of the body mass ontogeny. Genetic drift (as indicated by variation among replicate lines) produced significant changes in both the position and shape of all three ontogenies; however, its effect differed between the selection and control groups. For wheel running and food consumption, genetic drift only influenced the control ontogenies, whereas for body mass, genetic drift had a significant effect in both selection groups. Both body-mass and food-consumption ontogenies were significantly altered by activity environment, with the environment causing significant changes in the shape and position of both ontogenies. Overall the results demonstrate strong effects of early-age selection, genetic drift, and environmental variation on the evolution and expression of behavioral and morphological ontogenies, with selection changing only the position of the morphological ontogeny but both the position and shape of the behavioral ontogenies.
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Affiliation(s)
- Theodore J Morgan
- School of Biological Sciences, Washington State University, Pullman, Washington 99164, USA.
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