Bone-building receptor
The balance is built into one molecule, which is why it is worth seeing. Binding activates both the pathway that raises the release messenger and a second pathway that increases the enzyme destroying that same messenger — so the receptor counteracts itself. It is the clearest single illustration of the pattern this whole MAP keeps showing: the machinery is designed to limit its own output, and here it does so inside one receptor rather than across a loop.
In depth
A single receptor that pushes fat release and cancels it at the same time, through two different G proteins.
What drives it
Bone health increases it.
PTHR1 is expressed on osteoblasts and renal tubular cells; bone is its principal expressing tissue. PMID 23729679
Cortisol receptor signaling increases it.
Glucocorticoids upregulate PTH1R expression in osteoblastic cells. doi 10.1111/j.1601-0825.2006.01234.x · PMID 17241426
What it drives
It increases The cell's go-signal.
10.1186/s40510-025-00555-5 — one receptor, two opposing arms. 'Binding of parathyroid hormone (PTH) to parathyroid hormone receptor 1 (PTHR1) activates Gs- and Gq-coupled signaling. Whereas Gs activates the AC-cAMP-PKA pathway'. doi 10.1186/s40510-025-00555-5 · PMID 29514884
It increases Messenger-clearing enzyme.
The same receptor cancels itself. 'Gq signaling events lead to increased sequestration of cAMP by phosphodiesterase (pde) activation, which counteracts the lipolytic effects of Gs-coupled signaling elicited by PTHR1' (doi 10.1242/jeb.165381 [PMID 29514884]). The clearest single illustration of this MAP's recurring pattern — the limiter lives inside the accelerator. doi 10.1242/jeb.165381 · PMID 29514884
Blends that modulate it
Each blend page names this pathway and carries the study behind its claim.
See it on the map
Open the causal map to follow this pathway upstream and downstream, arrow by arrow, each with its study.