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. 2020 Nov 30;21(23):9144. doi: 10.3390/ijms21239144

Figure 2.

Figure 2

Leptin induced sympathetic nervous system (SNS) signaling at β2A-receptors in osteoblasts inhibits the Insulin-OCN-Feed-Forward-Loop by causing an increase in ESP gene expression and therefore osteoblast testicular tyrosinphosphatase (OST-PTP) synthesis. OST-PTP in turn dephosphorylates the insulin receptor as well as FoxO-1leading to missing Runt-related transcription factor 2 (RUNX) stimulation and Gla-OCN production as well as the disinhibition of OPG synthesis followed by a decrease of ostoeclast activation and pH-dependent Glu-OCN release from the ECM [11,13,16,23,24,25].