Effects of adipose-derived mesenchymal stem cells on nociceptive sensitivity and repair processes at achilles tendon injury model in rats

On the model of Achilles tendon injury in rats, the antinociceptive and regenerative effect of allogeneic transplantation of various doses of adipose-derived mesenchymal stem cells (ADMSCs) into the lesion area was studied. It was found that netiher of tested regimens of allogeneic transplantation of ADMSCs contributed to a decrease in the edema of the injured limb. Among the studied regimens, only a twofold administration of 0.25 • 106 ADMSCs exhibited an antinociceptive effect. Administration of 0.50 • 106 ADMSCs promoted the accelerated onset of neovascularization of tendon tissue, while enhancing inflammation and the formation of granulation tissue. Double transplantation of 0.25 • 106 ADMSCs led to accelerated reorganization of collagen fibers, later neovascularization, however, there was an absence of inflammatory infiltrate, lipomatosis, and massive formation of granulation tissue in the lesion area.