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Reduction of intraarticular adhesion of knee by local application of rapamycin in rabbits via inhibition of fibroblast proliferation and collagen synthesis.

Zhao S, Sun Y, Li X, Wang J, Yan L, Chen H, Wang D, Dai J, He J - J Orthop Surg Res (2016)

Bottom Line: The results shown that RAPA could significantly inhibit the proliferation of fibroblasts and reduce collagen synthesis; in the rabbit model of knee surgery, there were weak scar tissues around the decorticated areas in the 0.2 mg/ml RAPA group; moderate scar tissues were found in the 0.1 mg/ml RAPA group.However, severe fibrous adhesions were found in the 0.05 mg/ml RAPA group and the control group.The hydroxyproline content and the fibroblast density in the 0.2 mg/ml and 0.1 mg/ml RAPA groups were significantly less than those of the control group.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopedics, Xiangya Second Hospital, Central South University, Changsha, Hunan, 410012, China.

ABSTRACT

Background: The formation of intraarticular adhesion is a common complication after total knee arthroplasty or anterior cruciate ligament reconstruction. Previously, little research was reported regarding whether the local application of rapamycin (RAPA) could reduce intraarticular adhesion following knee surgery. In our present study, we determined the therapeutic effect of RAPA by local application on the reduction of intraarticular adhesion following knee surgery in rabbits.

Methods: In this study, we built the model of knee surgery according to a previous study. The decorticated areas of the cortical bone were exposed and covered with cotton pads soaked with different concentrations of RAPA or physiological saline for 10 min. All of the rabbits were euthanized 4 weeks after the surgery. Macroscopic evaluation of the hydroxyproline content, the histological morphological analysis and collagen density and fibroblast density were used to evaluate the effect of RAPA on reducing intraarticular adhesion.

Results: The results shown that RAPA could significantly inhibit the proliferation of fibroblasts and reduce collagen synthesis; in the rabbit model of knee surgery, there were weak scar tissues around the decorticated areas in the 0.2 mg/ml RAPA group; moderate scar tissues were found in the 0.1 mg/ml RAPA group. However, severe fibrous adhesions were found in the 0.05 mg/ml RAPA group and the control group. The hydroxyproline content and the fibroblast density in the 0.2 mg/ml and 0.1 mg/ml RAPA groups were significantly less than those of the control group.

Conclusions: We concluded that the local application of RAPA could reduce intraarticular adhesion after knee surgery in the rabbit model; this effect was mediated by inhibition of fibroblast proliferation and collagen synthesis, which may provide a new method for reducing intraarticular adhesion after clinical knee surgery.

No MeSH data available.


Related in: MedlinePlus

The histological view of the intraarticular adhesion issues in the decorticated areas treated with RAPA (0.2 mg/ml (a), 0.1 mg/ml (b) and 0.05 mg/ml (c)) and saline (d). Note that loose scar tissues were found in the decorticated areas treated with the 0.1 mg/ml group and 0.2 mg/ml RAPA group. Dense scar tissue was found in the decorticated areas treated with saline. The sections were stained with HE (×200)
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Fig2: The histological view of the intraarticular adhesion issues in the decorticated areas treated with RAPA (0.2 mg/ml (a), 0.1 mg/ml (b) and 0.05 mg/ml (c)) and saline (d). Note that loose scar tissues were found in the decorticated areas treated with the 0.1 mg/ml group and 0.2 mg/ml RAPA group. Dense scar tissue was found in the decorticated areas treated with saline. The sections were stained with HE (×200)

Mentions: In the control group, dense scar adhesions were found around the decorticated areas of the femoral condyle, which tethered the surrounding soft tissues to the femur. In the 0.1 mg/ml RAPA group, mild scar tissues were observed around the decorticated areas compared with those of 0.05 mg/ml RAPA group and the control group. However, loose fibrous adhesion tissue was observed in the 2.0 mg/ml RAPA group. The representative images of the HE staining of the scar tissues in each group are shown in Fig. 2.Fig. 2


Reduction of intraarticular adhesion of knee by local application of rapamycin in rabbits via inhibition of fibroblast proliferation and collagen synthesis.

Zhao S, Sun Y, Li X, Wang J, Yan L, Chen H, Wang D, Dai J, He J - J Orthop Surg Res (2016)

The histological view of the intraarticular adhesion issues in the decorticated areas treated with RAPA (0.2 mg/ml (a), 0.1 mg/ml (b) and 0.05 mg/ml (c)) and saline (d). Note that loose scar tissues were found in the decorticated areas treated with the 0.1 mg/ml group and 0.2 mg/ml RAPA group. Dense scar tissue was found in the decorticated areas treated with saline. The sections were stained with HE (×200)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4837638&req=5

Fig2: The histological view of the intraarticular adhesion issues in the decorticated areas treated with RAPA (0.2 mg/ml (a), 0.1 mg/ml (b) and 0.05 mg/ml (c)) and saline (d). Note that loose scar tissues were found in the decorticated areas treated with the 0.1 mg/ml group and 0.2 mg/ml RAPA group. Dense scar tissue was found in the decorticated areas treated with saline. The sections were stained with HE (×200)
Mentions: In the control group, dense scar adhesions were found around the decorticated areas of the femoral condyle, which tethered the surrounding soft tissues to the femur. In the 0.1 mg/ml RAPA group, mild scar tissues were observed around the decorticated areas compared with those of 0.05 mg/ml RAPA group and the control group. However, loose fibrous adhesion tissue was observed in the 2.0 mg/ml RAPA group. The representative images of the HE staining of the scar tissues in each group are shown in Fig. 2.Fig. 2

Bottom Line: The results shown that RAPA could significantly inhibit the proliferation of fibroblasts and reduce collagen synthesis; in the rabbit model of knee surgery, there were weak scar tissues around the decorticated areas in the 0.2 mg/ml RAPA group; moderate scar tissues were found in the 0.1 mg/ml RAPA group.However, severe fibrous adhesions were found in the 0.05 mg/ml RAPA group and the control group.The hydroxyproline content and the fibroblast density in the 0.2 mg/ml and 0.1 mg/ml RAPA groups were significantly less than those of the control group.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthopedics, Xiangya Second Hospital, Central South University, Changsha, Hunan, 410012, China.

ABSTRACT

Background: The formation of intraarticular adhesion is a common complication after total knee arthroplasty or anterior cruciate ligament reconstruction. Previously, little research was reported regarding whether the local application of rapamycin (RAPA) could reduce intraarticular adhesion following knee surgery. In our present study, we determined the therapeutic effect of RAPA by local application on the reduction of intraarticular adhesion following knee surgery in rabbits.

Methods: In this study, we built the model of knee surgery according to a previous study. The decorticated areas of the cortical bone were exposed and covered with cotton pads soaked with different concentrations of RAPA or physiological saline for 10 min. All of the rabbits were euthanized 4 weeks after the surgery. Macroscopic evaluation of the hydroxyproline content, the histological morphological analysis and collagen density and fibroblast density were used to evaluate the effect of RAPA on reducing intraarticular adhesion.

Results: The results shown that RAPA could significantly inhibit the proliferation of fibroblasts and reduce collagen synthesis; in the rabbit model of knee surgery, there were weak scar tissues around the decorticated areas in the 0.2 mg/ml RAPA group; moderate scar tissues were found in the 0.1 mg/ml RAPA group. However, severe fibrous adhesions were found in the 0.05 mg/ml RAPA group and the control group. The hydroxyproline content and the fibroblast density in the 0.2 mg/ml and 0.1 mg/ml RAPA groups were significantly less than those of the control group.

Conclusions: We concluded that the local application of RAPA could reduce intraarticular adhesion after knee surgery in the rabbit model; this effect was mediated by inhibition of fibroblast proliferation and collagen synthesis, which may provide a new method for reducing intraarticular adhesion after clinical knee surgery.

No MeSH data available.


Related in: MedlinePlus