Enalapril increases the level of:
Interferon
Growth factors
Bradykinin
All of the above
Enalapril is an ACE inhibitor and the adverse effect profile of all ACE inhibitors is similar. One side effect is cough in the patients taking ACE inhibitor.
A persistent brassy cough occurs  in 10- 16% patients within 1- 8  weeks, often requires discontinuation of the drug-subsides 4- 6 days thereafter. It is not dose related and appears to be  caused by inhibition of bradykinin/substance P breakdown (which leads to increase in levels of Bradykinin)  in the lungs of susceptible individuals.
Reference: Essentials of Medical Pharmacology Eighth Edition KD  TRIPATHI  page no 531