CAMP is a second messenger for a number of hormones and it activates protein kinase for its action. All of the following use cAMP as a second messenger, EXCEPT:

Vasopressin uses calcium or phosphatidylinositol (PIP2) as second messengers. Hormones which uses cAMP as the second messenger: ACTH FSH and LH PTH ADH HCG TSH Glucagon Calcitonin Catecholamines Ref: Textbook of Biochemistry by DM Vasudevan, 5th edition, Page 380.