Negatively regulates leptin receptor (LEPR) cell surface expression, and thus decreases response to leptin. Negatively regulates growth hormone (GH) receptor cell surface expression in liver. May play a role in liver resistance to GH during periods of reduced nutrient availability. {ECO:0000269|PubMed:18042720, ECO:0000269|PubMed:19907080}. This is the function of LEPROT (leptin receptor overlapping transcript, Ensembl gene identifier ENSG00000213625).