Human Big ET-1 comprises residues 53-90 of the endothelin precursor (preproendothelin). Compared to the mature endothelin-1 (hET-1), the peptide show less vasoconstrictor activity in vitro, but similar pressor effects in vivo. Former CAS-number 121014-53-7.

The big endothelins comprise residues 53-90 (human big ET-1) and 53-91 (porcine big ET-1) of the endothelin precursor (preproendothelin). Compared to the mature endothelin-1 (ET-1), both peptides show less vasoconstrictor activity in vitro, but similar pressor effects in vivo. Former CAS-number 121014-54-8.

Endothelin-1 (1-31) (Human) is a powerful vasoconstrictor and agent for inducing hypertension, originating from the specific hydrolysis of big ET-1 by chymase [1].

Endothelin-1 (1-31) (Human) acetate, a potent vasoconstrictor and hypertensive agent, is produced through the selective hydrolysis of big ET-1 by chymase [1].