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Lactoferricin mediates anabolic and anti-catabolic effects in the intervertebral disc

✍ Scribed by Jae-Sung Kim; Michael B. Ellman; Howard S. An; Dongyao Yan; Andre J. van Wijnen; Gillian Murphy; David W. Hoskin; Hee-Jeong Im

Publisher
John Wiley and Sons
Year
2012
Tongue
English
Weight
421 KB
Volume
227
Category
Article
ISSN
0021-9541

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✦ Synopsis

Abstract

Lactoferricin (LfcinB) antagonizes biological effects mediated by angiogenic and catabolic growth factors, in addition to pro‐inflammatory cytokines and chemokines in human endothelial cells and tumor cells. However, the effect of LfcinB on intervertebral disc (IVD) cell metabolism has not yet been investigated. Using bovine nucleus pulposus (NP) cells, we analyzed the effect of LfcinB on proteoglycan (PG) accumulation, PG synthesis, and anabolic gene expression. We assessed expression of genes for matrix‐degrading enzymes such as matrix metalloproteases (MMPs) and a disintegrin‐like and metalloprotease with thrombospondin motifs (ADAMTS family), as well as their endogenous inhibitors, tissue inhibitor of metalloproteases (TIMPs). In order to understand the specific molecular mechanisms by which LfcinB exerts its biological effects, we investigated intracellular signaling pathways in NP cells. LfcinB increased PG accumulation mainly via PG synthesis in a dose‐dependent manner. Simultaneously, LfcinB dose‐dependently downregulated catabolic enzymes. LfcinB's anti‐catabolic effects were further demonstrated by a dose‐dependent increase in multiple TIMP family members. Our results demonstrate that ERK and/or p38 mitogen‐activated protein kinase pathways are the key signaling cascades that exert the biological effects of LfcinB in NP cells, regulating transcription of aggrecan, SOX‐9, TIMP‐1, TIMP‐2, TIMP‐3, and iNOS. Our results suggest that LfcinB has anabolic and potent anti‐catabolic biological effects on bovine IVD cells that may have considerable promise in the treatment of disc degeneration in the future. J. Cell. Physiol. 227: 1512–1520, 2012. © 2011 Wiley Periodicals, Inc.

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