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Together, substance P- and enkephalin-positive terminals represent 24% of all synapses onto Ch Is in the monkey putamen.These findings show that Ch Is receive prominent GABAergic inputs from multiple origins, including a significant contingent from axon collaterals of direct and indirect pathway projection neurons.In rodents, the striatum comprises 95% projection neurons (i.e., medium spiny neurons; MSNs) and 5% interneurons (Kemp and Powell, 1971; Wilson and Groves, 1980; Graveland and Di Figlia, 1985; Bolam et al., 2000), whereas in primates, interneurons account for as much as 24% of the striatal neuron population (Pasik et al., 1976; Graveland and Di Figlia, 1985; Roberts et al., 1996; Wu and Parent, 2000).The large cholinergic interneurons (Ch Is) have long been recognized as important constituents of the striatal microcircuitry.The specificity of the SP antibodies used in this study have been demonstrated by showing the equal displacement of labeled SP by five-, six-, and eight-amino acid COOH-terminal fragments of SP, as well as full-length SP, and by the specific binding of these antibodies with cell bodies and terminals located in well-defined SP-containing nuclei in the central nervous system (Cuello et al., 1979; Beach and Mc Geer, 1984; Bolam and Izzo, 1988; Smith et al., 1998; Reiner et al., 1999, Wolansky et al., 2007).

Prior to the immunocytochemical processing, the sections were placed into a 1% sodium borohydride/PBS solution for 20 minutes, followed by washes with PBS.Sections from the postcommissural putamen were processed for light and electron microscopy immunoperoxidase localization of choline acetyl transferase (Ch AT) or immunogold localization of SP, Leucine [Leu In the SP and Ch AT double-label experiments, we used rabbit polyclonal anti-Ch AT antibodies.The specificity of this antiserum has been demonstrated through experiments showing that the overall pattern of immunostaining obtained with this antiserum is confined to brain areas known to express detectable levels of Ch AT (German et al., 1985; Peterson et al., 1990; Smith ML et al., 1993, 1994), and that preadsorption immunohistochemical assays resulted in the reduction of Ch AT staining in these regions (Shiromani et al., 1987, 1990; Smith et al., 1993; Holt et al., 1997).We found that the application of either of the two Ch AT antisera on the tissue used in our study resulted in a pattern of staining that resembled that found in previous studies of Ch AT immunoreactivity in nonhuman primates (Graybiel et al., 1986; Di Figlia, 1987; Bernacer et al., 2007).Monoclonal antibodies against SP were used to identify the direct pathway MSN collaterals, whereas the indirect pathway MSN collaterals were identified with polyclonal antibodies against Met-Enk and Leu-Enk ().The specificity of this antiserum has been demonstrated through western blot analysis in rat and human brain tissue (Karson et al., 1993).Control incubations from which the primary antibodies were omitted resulted in a complete lack of striatal cell body or fiber immunostaining (Holt et al., 1999).Some of these data have been presented in abstract form (Gonzales et al., 2009, 2010, 2011).) from the Yerkes National Primate Research Center colony was used in this study.At the time of sacrifice, these animals were deeply anesthetized with an overdose of pentobarbital (100 mg/kg, i.v.) and transcardially perfusion-fixed with a cold oxygenated Ringer's solution and a fixative containing 0.1% glutaraldehyde and 4% paraformaldehyde in phosphate buffer (PB; 0.1 M, p H 7.4).Ch Is give rise to extensive intrastriatal axonal arborizations and harbor thick primary dendrites with highly branched and varicose distal dendritic processes (Difiglia et al., 1980; Chang and Kitai, 1982; Di Figlia and Carey, 1986; Yelnik et al., 1991).Ch Is are evenly distributed throughout all functional striatal territories and strongly influence the activity of striatal projection neurons (Graybiel, 1990; Bernacer et al., 2007; Pisani et al., 2007; Tepper et al., 2008; Ding et al., 2010; Bonsi et al., 2011; Crittenden and Graybiel, 2011).

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