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. 2020 Aug 28;11:1335. doi: 10.3389/fphar.2020.01335

Figure 2.

Figure 2

I.T. injection of apelin alleviated the inflammatory pain induced by intradermal injection of CFA in mice. Normal saline (NS) was used as a control. The upward and downward arrows indicate the time points when i.d. and i.t. injection were administered. (A, B) Effect of apelin-13 (0.1, 1 and 10 nmol/mouse, i.t.) on PWL in response to thermal stimulation and PWT in response to Von Frey filament stimulation. (C) The effect of i.t. application of 10 nmol apelin-13, (pyr)apelin-13 and apelin-36 on PWL. (D) Effect of APJ receptor antagonist apelin-13(F13A) (20 nmol/mouse) on antinociception of (pyr)apelin-13 (10 nmol/mouse). Data are expressed as means ± SEM. n = 6–10 per group. *p < 0.05, compared with vehicle control (i.d. NS + i.t. NS); #p < 0.05, compared with CFA group (i.d. CFA + i.t. NS); §p < 0.05, compared with apelin-13-treated group (i.d. CFA + i.t. apelin-13). F13A, apelin-13(F13A).