<prompt> 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:CoicotropinDopamineGlucagonVasopressin  <response>: 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. 