Chasalow et al. (2018). Steroids. doi: 10.1016/j.steroids.2018.03.001
…solvent and a new sample was injected with the auto-injector. Data is presented as generated by the software. Source of tissues and blood: The following tissues and blood samples were purchased from Pel Freez Biologicals (Pel Freez Biologicals LLC, 219 N. Arkansas Street, Rogers, AR 72756): [a] horse serum (Equus ferus caballus), [b] pig adrenals (Sus scrofa domesticus), [c] cattle adrenals (Bos taurus), [d] sheep…
Abstract
We describe a novel steroid, which we have named "Ionotropin". Its unique features are: [1] it has 23 carbon atoms and [2] it is a phosphocholine ester. There are no other known mammalian steroids with either structural feature. Ionotropin cross reacts with digoxin-specific antibodies and may be the long-sought, endogenous, mammalian digoxin-like material (DLM). Using LC-MS, we identified three other phosphocholine steroids in serum. Two of these steroids also cross-react with digoxin specific antibodies. In adrenal extracts, we found both phosphocholine esters and corresponding phospho-ethanolamine steroid esters. There are no other known phosphoethanolamine steroid esters. Together, these 8 compounds define a biosynthetic pathway from 7-dehydropregnenolone to Ionotropin. Ionotropin may be the only steroid hormone not synthesized with cholesterol as a precursor. Finally, we propose that Ionotropin serves as the endogenous potassium sparing hormone. Ionotropin provides a new understanding of renal, cardiac, gonadal and placental function.