Changes of some immune functions after percutaneous transluminal coronary angioplasty (PTCA)

This study aimed to evaluate some aspects of the immune response in 10 cardiopathic patients during the execution of percutaneous transluminal coronary angioplasty (PTCA) by obtaining blood samples from coronary sinus. In particular we considered some PMN functions as well as lysosomal release and oxidative metabolism evaluated as chemiluminescence and superoxide anion (O 2 - ) production. We also studied serum levels of complement C3 and C4, lymphocyte populations (CD3, CD4, CD8, CD19, CD16) and plasmatic determinations of interleukin 2 (IL2). After PTCA, we found a decrease of total count of blood lymphocytes, whereas the number of neutrophils remained unchanged. The decrease involved to a similar extent the lymphocyte subsets CD3, CD4 and CD8, whereas CD19 and CD16 were unchanged. The plasmatic levels of IL2 did not show any significant modification. Concerning PMN, their chemiluminescence was significantly increased after PTCA as compared to basal values : this response was promptly detectable in isolated PMN, both without and with stimulation with fMLP. Similarly superoxide anion production, both spontaneous and stimulated, was increased in PMN suspensions after PTCA, even if this increase did not reach statistical significance. As regards circulating levels of lysosomal enzymes, we found a significant increase of plasmatic levels of elastase, whereas the serum determinations of lysozyme and betaglucuronidase did not change. Concerning the complement system, we found a significant decrease of complement fractions C3 and C4. In conclusion, our results showed certain changes in some humoral and cellular systems ; in particular the neutrophil activation through the release of proteolytic enzymes and the generation of oxygen radicals could increase the damage to vessel walls and activate other systems having a negative effect in the ischaemia-associated consequences.