TY - JOUR
T1 - Changes in vascular permeability in the spinal cord contribute to chemotherapy-induced neuropathic pain
AU - Montague-Cardoso, Karli
AU - Pitcher, Thomas
AU - Chisolm, Kim
AU - Salera, Giorgia
AU - Lindstrom, Erik
AU - Hewitt, Ellen
AU - Solito, Egle
AU - Malcangio, Marzia
PY - 2020/1/1
Y1 - 2020/1/1
N2 - Chemotherapy-induced neuropathic pain is a dose-limiting side effect of many cancer therapies due to their propensity to accumulate in peripheral nerves, which is facilitated by the permeability of the blood-nerve barrier. Preclinically, the chemotherapy agent vincristine (VCR) activates endothelial cells in the murine peripheral nervous system and in doing so allows the infiltration of monocytes into nerve tissue where they orchestrate the development of VCR-induced nociceptive hypersensitivity. In this study we demonstrate that VCR also activates endothelial cells in the murine central nervous system, increases paracellular permeability and decreases trans endothelial resistance. In in vivo imaging studies in mice, VCR administration results in trafficking of inflammatory monocytes through the endothelium. Indeed, VCR treatment affects the integrity of the blood-spinal cord-barrier as indicated by Evans Blue extravasation, disrupts tight junction coupling and is accompanied by the presence of monocytes in the spinal cord. Such inflammatory monocytes (Iba-1+ CCR2+ Ly6C+ TMEM119- cells) that infiltrate the spinal cord also express the pro-nociceptive cysteine protease Cathepsin S. Systemic treatment with a CNS-penetrant, but not a peripherally-restricted, inhibitor of Cathepsin S prevents the development of VCR-induced hypersensitivity, suggesting that infiltrating monocytes play a functional role in sensitising spinal cord nociceptive neurons. Our findings guide us towards a better understanding of central mechanisms of pain associated with VCR treatment and thus pave the way for the development of innovative antinociceptive strategies.
AB - Chemotherapy-induced neuropathic pain is a dose-limiting side effect of many cancer therapies due to their propensity to accumulate in peripheral nerves, which is facilitated by the permeability of the blood-nerve barrier. Preclinically, the chemotherapy agent vincristine (VCR) activates endothelial cells in the murine peripheral nervous system and in doing so allows the infiltration of monocytes into nerve tissue where they orchestrate the development of VCR-induced nociceptive hypersensitivity. In this study we demonstrate that VCR also activates endothelial cells in the murine central nervous system, increases paracellular permeability and decreases trans endothelial resistance. In in vivo imaging studies in mice, VCR administration results in trafficking of inflammatory monocytes through the endothelium. Indeed, VCR treatment affects the integrity of the blood-spinal cord-barrier as indicated by Evans Blue extravasation, disrupts tight junction coupling and is accompanied by the presence of monocytes in the spinal cord. Such inflammatory monocytes (Iba-1+ CCR2+ Ly6C+ TMEM119- cells) that infiltrate the spinal cord also express the pro-nociceptive cysteine protease Cathepsin S. Systemic treatment with a CNS-penetrant, but not a peripherally-restricted, inhibitor of Cathepsin S prevents the development of VCR-induced hypersensitivity, suggesting that infiltrating monocytes play a functional role in sensitising spinal cord nociceptive neurons. Our findings guide us towards a better understanding of central mechanisms of pain associated with VCR treatment and thus pave the way for the development of innovative antinociceptive strategies.
KW - Blood-spinal cord barrier
KW - Cathepsin S
KW - Chemotherapy-induced neuropathic pain
KW - Endothelium
KW - Infiltration
KW - Monocytes
KW - Permeability
KW - Tight Junctions
KW - Vincristine
UR - http://www.scopus.com/inward/record.url?scp=85074414078&partnerID=8YFLogxK
U2 - 10.1016/j.bbi.2019.10.018
DO - 10.1016/j.bbi.2019.10.018
M3 - Article
SN - 0889-1591
VL - 83
SP - 248
EP - 259
JO - Brain Behavior and Immunity
JF - Brain Behavior and Immunity
ER -