4.4 Article

Vasoactive Intestinal Peptide Promotes Fracture Healing in Sympathectomized Mice

Journal

CALCIFIED TISSUE INTERNATIONAL
Volume 109, Issue 1, Pages 55-65

Publisher

SPRINGER
DOI: 10.1007/s00223-021-00820-9

Keywords

Vasoactive intestinal peptide; Fracture healing; Sympathetic nervous systems; 6-OHDA

Funding

  1. National Natural Science Foundation of China [81772322]
  2. Hong Kong Government Research Grant Council, General Research Fund [14120118, 14160917, C7030-18G, T13-402/17-N]
  3. Hong Kong Innovation Technology Commission Funds [PRP/050/19FX]
  4. Hong Kong Medical Research Funds [16170951, 17180831]
  5. SMART program, Lui Che Woo Institute of Innovative Medicine, The Chinese University of Hong Kong

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Vasoactive intestinal peptide (VIP) plays a significant role in modulating bone homeostasis and promoting fracture healing. Study on sympathectomized mice models showed that VIP treatment can rescue the inhibitory effects of sympathetic nervous system disorder on bone structure and fracture healing, leading to improved bone quality and mechanical properties. VIP administration inhibits bone resorption and enhances osteogenesis marker expression, suggesting VIP as a potential alternative treatment for fracture healing.
Vasoactive intestinal peptide (VIP) as a neuromodulator and neurotransmitter played a significant role in modulating bone homeostasis. Our previous study reported an essential role of VIP in in vitro BMSCs osteogenesis and in vivo bone defect repair. VIP was also revealed to have a promoting effect on embryonic skeletal element development. However, the role of VIP in fracture healing is not known yet. We hypothesized that the disorder of sympathetic nervous system impairs bone structure and fracture healing, whereas VIP may rescue the sympathetic inhibition effects and promote fracture healing. We employed a 6-hydroxydopamine (6-OHDA) induced sympathectomy mice model (sympathectomized mice), in which successful sympathetic inhibition was confirmed by a decreased level of norephedrine (NE) in the spleen. In the sympathectomized mice, the femoral micro-architecture, bone density and mechanical properties were all impaired compared to the vehicle control mice. The femoral fracture was created in the vehicle or sympathectomized mice. Vehicle mice were locally injected with PBS as a negative control, and the sympathectomized mice were treated with injection of PBS or VIP. VIP expression at the fracture site was significantly decreased in sympathectomized mice. The fracture healing was repressed upon 6-OHDA treatment and rescued by VIP treatment. Micro-CT examination showed that the femoral bone micro-architecture at the fracture sites and mechanical properties were all impaired. Simultaneously, the expression level of osteogenic markers OCN and OPN were reduced in sympathectomized mice compared with vehicle group. While the VIP treatment rescued the repression effects of 6-OHDA on bone remodeling and significantly promoted bone quality and mechanical properties as well as increased osteogenesis marker expression in the sympathectomized mice. VIP administration promoted bone fracture healing by inhibiting bone resorption, making it a putative new alternative treatment strategy for fracture healing.

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