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BMP-2 adverse reactions treated with human dose equivalent dexamethasone in a rodent model of soft-tissue
Chengjie Xiong1, Michael D Daubs, Scott R Montgomery
1*Department of Orthopedics, Xinqiao Hospital, Third Military Medical University, Chongqing, People's Republic of China †Department of Orthopaedic Surgery, University of California at Los Angeles (UCLA), Los Angeles, CA; and ‡Orthopaedic Spine Department, Second Xiangya Hospital, Central South University, Changsha, People's Republic of China.
Study Design:
Basic science rodent model of bone morphogenetic protein-2 (BMP-2) soft-tissue inflammation.
Objective:
This study investigated the anti-inflammatory effect of human dose equivalent (HDE) dexamethasone (DM) for treatment of BMP-2-related soft-tissue inflammation in a rodent model and suggests an appropriate dose for utilization in the clinical practice of spine surgeons.
Summary Of Background Data:
BMP-2 is frequently used in spinal surgery to augment fusion. Yet, side effects of soft-tissue inflammation have been observed. DM decreases proinflammatory cytokine production and cellular immune response. However, the anti-inflammatory effects of HDE DM in a rodent model of BMP-2-associated soft-tissue inflammation have not been reported.
Methods:
Five, 10, and 15 mg of HDE DM were administered 3 times perioperatively to rodent cohorts receiving BMP-2 paraspinal implants and compared against BMP-2 only positive controls and phosphate buffer negative controls (n = 6 subjects per group). Histopathology, magnetic resonance imaging, and gross dissection were used as measures of cellular, edematous, and exudative inflammatory response. Serial killings were made on day 2 and day 7 postoperatively.
Results:
Magnetic resonance imaging volume rendering demonstrated inflammatory edema decreased by 49% from 605.4 mm to 304.03 mm in subjects treated with 5, 10, or 15 mg of HDE DM (P < 0.05). Histopathological analysis demonstrated inflammatory cross-sectional area decreased 28.8% from 1.84 mm to 1.31 mm in subjects treated with 5, 10 or 15 mg of HDE DM (P < 0.05). Immune cellular infiltration depth decreased 38.5% from 0.26 mm to 0.16 in subjects treated with 15 mg of HDE DM (P < 0.05). Gross anatomical inflammatory exudates were prevented in 100% of subjects treated with 10 or 15 mg of HDE DM (P < 0.05).
Conclusion:
Low-dose DM administration is effective in controlling the cellular inflammation and edema resulting from BMP-2. Ten or 15 mg of DM might be considered by spine surgeons for controlling the inflammation and edema seen in spine surgery with BMP-2.