S (2008) 333:353Many but not all ret-positive cells drop trkA expression postnataly and bind the lectin, Griffonia simplicifolia isolectin B4 Postnatally, neurons coexpressing ret and trkA, as analysed by 555-60-2 medchemexpress double ISH, undergo trkA extinction, which 471-53-4 site appears to be total at P14 (Luo et al. 2007). This method is ret-dependent because it is slowed down in ret mutants. Conversely, ret expression is NGF-dependent as, in NGF/Bax (bcl-2 related pro-apoptotic protein) double-mutants, only some ret-positive neurons are present at P0 and these are trkA-negative (Luo et al. 2007). In mature animals, the overlap of ret and trkA expression is restricted and amounts to five 5 in mouse lumbar segment 5 (L5) DRG (Molliver et al. 1997; Orozco et al. 2001). In adult rat, 26 eight of trkA-positive cells in lumbar DRG express ret and 15 of ret-positive cells express trkA (Bennett et al. 1998; Kashiba et al. 1998, 2003). A total of 9 of DRG neurons express both. Roughly half of trkB- and trkCpositive cells express ret (Kashiba et al. 2003). About 30 of ret-immunoreactive cells are calcitonin gene-related peptide (CGRP)-positive (Bennett et al. 1998). Huge overlap is identified in between ret expression and binding in the lectin Griffonia simplicifolia isolectin B4 (IB4). In lumbar DRG of adult rat and mouse, 95 and one hundred , respectively, of IB4-binding cells are ret-positive (Bennett et al. 1998; Molliver et al. 1997) and 80 and 70 of ret-positive cells bind IB4, respectively (Bennett et al. 1998; Kashiba et al. 2001; Molliver et al. 1997). IB4binding neurons constitute a population of functionally distinct nociceptors that differ inside the duration of action potentials (Stucky and Lewin 1999; Fang et al. 2006), amplitude of heatactivated currents, density of tetrodotoxin (TTX)-resistent sodium currents (Stucky and Lewin 1999) and immunoreactivity (IR) for the sodium channel Nav1.9 (Fang et al. 2006). Due to the restricted colocalization of IB4 binding and CGRP expression (Silverman and Kruger 1990), peptidergic and nonpeptidergic nociceptors have already been distinguished and are correlated with trkA and ret expression, respectively. Nonetheless, of note, not all IB4-binding cells are nociceptors (Fang met al. 2006), some trkA-positive cells bind IB4 and a few retpositive cells show no IB4 binding (Kashiba et al. 2001). There is a significant but incomplete overlap of ret and GFRalpha expression ret expression overlaps largely with expression ofGFRalpha1, GFRalpha2 and GFRalpha3. Of ret-positive lumbar DRG neurons, 66 express GFRalpha1 in adult rat (Kashiba et al. 2003) and 89 in adult mice (Molliver et al. 1997), as analysed by ISH on serial sections and double ISH, respectively. In P14 mice, 18 of ret-positive cells express GFRalpha1 as analysed by double ISH (Luo et al. 2007). Some 34 of ret-positive cells express GFRalpha2 and 33 express GFRalpha3 in the lumbar DRG of adult rat (Kashiba et al. 2003). In P14 mice, 61 and 14 of ret-positive cells express GFRalpha2 and GFRalpha3, respectively (Luo et al. 2007). Conversely, 79 of GFRalpha1-positive cells express ret (Kashiba et al. 2003) and much more than 90 of GFRalpha2and GFRalpha3-expressing cells are ret-positive in adult rats (Kashiba et al. 1998, 2003; Orozco et al. 2001). In adult mice, 82 of GFRalpha3-positive cells express ret, as analysed by double IHC (Orozco et al. 2001). Data on the coexpression of GFRalpha receptors differ in between research (Bennett et al. 1998; Kashiba et al. 2003). Expression of GFRalpha1 a.