<prompt> Relaxation of mesangial cells of kidney is brought about byPGF2aVasopressincAMPEndothelin  <response>: Mesangial cells contractionMesangial cells relaxationEndothelinsAngiotensin IIVasopressinNor-epinephrinePlatelet -activation factorPlatelet-derived growth factorThromboxane A2PGF2LT-C4and D4HistamineANPDopaminePGE2cAMPRefer: Ganongs Review of Medical Physiology 24thedition, pg no: 678-682 