Paracrine bone-derived senescent secretome is associated with spatially patterned extracellular matrix remodeling and altered biomechanics in human brain organoids
Abstract
Aging is increasingly recognized as a systemic process, yet the mechanisms by which signals from senescent peripheral cells accelerate brain aging remain poorly defined. Here, we used chronic exposure of human cerebral organoids to the secretome of senescent osteocytes to investigate how peripheral aging signals from bone reshape brain tissue architecture. We combined spatially resolved optical fiber-based interferometry nanoindentation with transcriptomic and immunofluorescence profiling, revealing distinct mechanical features across complementary measurements, including lower apparent modulus in intact organoids and spatially localized regions of elevated modulus in cryosectioned specimens. This spatially heterogeneous biomechanical remodeling was accompanied by upregulation of extracellular matrix (ECM), inflammatory, and senescence pathways, and suppression of neurodevelopmental and synaptic gene networks. Our results suggest that chronic paracrine exposure to senescent osteocyte-derived secretome is associated with localized extracellular matrix-related remodeling and mechanical vulnerability in human brain tissue, providing insight into how peripheral cellular senescence may contribute to regional brain fragility during aging. These pilot-scale findings were obtained using a single induced pluripotent stem cell line and a single conditioned-medium batch, with 1-6 experimental replicates per condition across assays; the mechanical analyses were exploratory.
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BibTeX
@article{kim2026paracrine,
title = {{Paracrine bone-derived senescent secretome is associated with spatially patterned extracellular matrix remodeling and altered biomechanics in human brain organoids}},
author = {Chanul Kim and Luke D Ofria and Hossein Shaygani and Anannya Kshirsagar and Sai Kulkarni and Alan Y Liu and James L Kirkland and Annie Kathuria and Maryam Tilton},
journal = {Stem Cells},
year = {2026},
month = oct,
doi = {10.1093/stmcls/sxag057},
url = {https://doi.org/10.1093/stmcls/sxag057},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Paracrine bone-derived senescent secretome is associated with spatially patterned extracellular matrix remodeling and altered biomechanics in human brain organoids
AU - Chanul Kim
AU - Luke D Ofria
AU - Hossein Shaygani
AU - Anannya Kshirsagar
AU - Sai Kulkarni
AU - Alan Y Liu
AU - James L Kirkland
AU - Annie Kathuria
AU - Maryam Tilton
PY - 2026
DA - 2026/10/12
JO - Stem Cells
DO - 10.1093/stmcls/sxag057
UR - https://doi.org/10.1093/stmcls/sxag057
AB - Aging is increasingly recognized as a systemic process, yet the mechanisms by which signals from senescent peripheral cells accelerate brain aging remain poorly defined. Here, we used chronic exposure of human cerebral organoids to the secretome of senescent osteocytes to investigate how peripheral aging signals from bone reshape brain tissue architecture. We combined spatially resolved optical fiber-based interferometry nanoindentation with transcriptomic and immunofluorescence profiling, revealing distinct mechanical features across complementary measurements, including lower apparent modulus in intact organoids and spatially localized regions of elevated modulus in cryosectioned specimens. This spatially heterogeneous biomechanical remodeling was accompanied by upregulation of extracellular matrix (ECM), inflammatory, and senescence pathways, and suppression of neurodevelopmental and synaptic gene networks. Our results suggest that chronic paracrine exposure to senescent osteocyte-derived secretome is associated with localized extracellular matrix-related remodeling and mechanical vulnerability in human brain tissue, providing insight into how peripheral cellular senescence may contribute to regional brain fragility during aging. These pilot-scale findings were obtained using a single induced pluripotent stem cell line and a single conditioned-medium batch, with 1-6 experimental replicates per condition across assays; the mechanical analyses were exploratory.
SN - 1066-5099
SN - 1549-4918
ER -