Cocaine and amphetamine regulated transcript

CART prepropeptide
Identifiers
SymbolCARTPT
NCBI gene9607
HGNC24323
OMIM602606
RefSeqNM_004291
UniProtQ16568
Other data
LocusChr. 5 q13.2
Search for
StructuresSwiss-model
DomainsInterPro
CART
cocaine- and amphetamine-regulated transcript
Identifiers
SymbolCART
PfamPF06373
InterProIPR009106
SCOP21hy9 / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

Cocaine- and amphetamine-regulated transcript, also known as CART, is a neuropeptide protein that in humans is encoded by the CARTPT gene.[1][2] CART appears to have roles in reward, feeding, and stress,[3] and it has the functional properties of an endogenous psychostimulant.[4]

Function

CART is a neuropeptide that produces similar behavior in animals as cocaine and amphetamine, but conversely blocks the effects of cocaine when they are co-administered. The peptide is found in several areas, among them the ventral tegmental area (VTA) of the brain. When CART was injected into rat VTA, increased locomotor activity was seen, which is one of the signs of "central stimulation" caused by psychostimulants, such as cocaine and amphetamine.[5] The same rats also tended to return to the place where they were injected. This is called conditioned place preference and is also seen after injection of cocaine.

CART peptides, in particular, CART(55–102), seem to have an important function in the regulation of energy homeostasis and interact with several hypothalamic appetite circuits. CART expression is regulated by several peripheral peptide hormones involved in appetite regulation, including leptin,[6] cholecystokinin and ghrelin,[7] with CART and cholecystokinin having synergistic effects on appetite regulation.[8]

CART is released in response to repeated dopamine release in the nucleus accumbens, and may regulate the activity of neurons in this area.[9] CART production is upregulated by CREB,[10] a protein thought to be involved with the development of drug addiction, and CART may be an important therapeutic target in the treatment of stimulant abuse.[11][12][13]

Tissue distribution

CART is an anorectic peptide and is widely expressed in both the central and peripheral nervous systems, particularly concentrated in the hypothalamus.[14] CART is also expressed outside of the nervous system in pituitary endocrine cells, adrenomedullary cells, islet somatostatin cells, and in rat antral gastrin cells.[15] Other structures and pathways associated with CART expression include the mesolimbic pathway (linking the ventral tegmental area to the nucleus accumbens) and amygdala.

CART is also found in a subset of retinal ganglion cells (RGCs), the primary afferent neurons in the retina. Specifically, it labels ON/OFF Direction Selective Ganglion Cells (ooDSGCs), a subpopulation of RGCs that stratify in both the ON and OFF sublamina of the Inner Plexiform Layer (IPL) of the retina. It is also found in a subset of amacrine cells in the Inner Nuclear Layer.[16] No role as of yet has been proposed for the location of this protein in these cell types.

Clinical significance

Studies of CART(54–102) action in rat lateral ventricle and amygdala suggest that CART plays a role in anxiety-like behavior, induced by ethanol withdrawal in rats.[17] Studies on CART knock-out mice indicates that CART modulates the locomotor, conditioned place preference and cocaine self-administration effects of psychostimulants. This suggests a positive neuromodulatory action of CART on the effects of psychostimulants in rats.[18] CART is altered in the ventral tegmental area of cocaine overdose victims, and a mutation in the CART gene is associated with alcoholism.[19] By inhibiting the rewarding effects of cocaine, CART has a potential use in treating cocaine addiction.[20]

CART peptides are inhibitors of food intake (anorectic) and closely associated with leptin and neuropeptide Y, two important food intake regulators. CART hypoactivity in the hypothalamus of depressed animals is associated with hyperphagia and weight gain.[21][22] CART is thought to play a key role in the opioid mesolimbic dopamine circuit that modulates natural reward processes.[23] CART also appears to play an important role in higher brain functions like cognition.[24]

History

CART was found by examining changes in the brain following cocaine or amphetamine administration. CART mRNA increased with cocaine administration. One of the goals was to find an endogenous anoretic substance. CART inhibited rat food intake by as much as 30 percent. When naturally occurring CART peptides were blocked by means of injecting antibodies for CART, feeding was increased. This led to suggestions that CART may play a role – though not being the only peptide – in satiety. In the late 1980s, researchers started to synthesize structurally cocaine-like and functionally CART-like substances in order to find medications that could help treat eating disorders as well as cocaine abuse. Chemically, these substances belong to phenyltropanes.[25]

CART receptor

The putative receptor target for CART evaded identification through 2011,[26] however in vitro studies strongly suggested that CART binds to a specific G protein-coupled receptor coupled to Gi/Go, resulting in increased ERK release inside the cell.[26][27][28][29] In 2020, CART was identified as the ligand for GPR160.[30] This finding was later challenged by the finding that GPR160 does not show specific binding to a radiolabeled version of CART either in a human cancer cell line that endogeneously expresses GPR160, or in a cell line that was transfected with PGR160.[31] Furthermore, CART does not induce GPR160 mediated signaling in human cells.[32]

Several fragments of CART have been tested to try and uncover the pharmacophore,[33][34] but the natural splicing products CART(55–102) and CART(62–102) are still of highest activity, with the reduced activity of smaller fragments thought to indicate that a compact structure retaining all three of CART's disulphide bonds is preferred.[35]

See also

References

  1. ^ Douglass J, Daoud S (March 1996). "Characterization of the human cDNA and genomic DNA encoding CART: a cocaine- and amphetamine-regulated transcript". Gene. 169 (2): 241–5. doi:10.1016/0378-1119(96)88651-3. PMID 8647455.
  2. ^ Kristensen P, Judge ME, Thim L, Ribel U, Christjansen KN, Wulff BS, et al. (May 1998). "Hypothalamic CART is a new anorectic peptide regulated by leptin". Nature. 393 (6680): 72–6. Bibcode:1998Natur.393...72K. doi:10.1038/29993. PMID 9590691. S2CID 4427258.
  3. ^ Zhang M, Han L, Xu Y (November 2011). "Roles of cocaine- and amphetamine-regulated transcript in the central nervous system". Clin. Exp. Pharmacol. Physiol. 39 (6): 586–92. doi:10.1111/j.1440-1681.2011.05642.x. PMID 22077697. S2CID 25134612.
  4. ^ Kuhar MJ, Adams S, Dominguez G, Jaworski J, Balkan B (February 2002). "CART peptides". Neuropeptides. 36 (1): 1–8. doi:10.1054/npep.2002.0887. PMID 12147208. S2CID 7079530.
  5. ^ Kimmel HL, Gong W, Vechia SD, Hunter RG, Kuhar MJ (August 2000). "Intra-ventral tegmental area injection of rat cocaine and amphetamine-regulated transcript peptide 55-102 induces locomotor activity and promotes conditioned place preference". The Journal of Pharmacology and Experimental Therapeutics. 294 (2): 784–92. PMID 10900261.
  6. ^ Murphy KG (July 2005). "Dissecting the role of cocaine- and amphetamine-regulated transcript (CART) in the control of appetite". Brief Funct Genomic Proteomic. 4 (2): 95–111. doi:10.1093/bfgp/4.2.95. PMID 16102267.
  7. ^ de Lartigue G, Dimaline R, Varro A, Dockray GJ (March 2007). "Cocaine- and amphetamine-regulated transcript: stimulation of expression in rat vagal afferent neurons by cholecystokinin and suppression by ghrelin". Journal of Neuroscience. 27 (11): 2876–82. doi:10.1523/JNEUROSCI.5508-06.2007. PMC 6672594. PMID 17360909.
  8. ^ Maletínská L, Maixnerová J, Matysková R, Haugvicová R, Pirník Z, Kiss A, et al. (2008). "Synergistic effect of CART (cocaine- and amphetamine-regulated transcript) peptide and cholecystokinin on food intake regulation in lean mice". BMC Neuroscience. 9: 101. doi:10.1186/1471-2202-9-101. PMC 2587474. PMID 18939974.
  9. ^ Hubert GW, Jones DC, Moffett MC, Rogge G, Kuhar MJ (January 2008). "CART peptides as modulators of dopamine and psychostimulants and interactions with the mesolimbic dopaminergic system". Biochemical Pharmacology. 75 (1): 57–62. doi:10.1016/j.bcp.2007.07.028. PMC 3804336. PMID 17854774.
  10. ^ Rogge GA, Jones DC, Green T, Nestler E, Kuhar MJ (January 2009). "Regulation of CART peptide expression by CREB in the rat nucleus accumbens in vivo". Brain Research. 1251: 42–52. doi:10.1016/j.brainres.2008.11.011. PMC 2734444. PMID 19046951.
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  13. ^ Rogge G, Jones D, Hubert GW, Lin Y, Kuhar MJ (October 2008). "CART peptides: regulators of body weight, reward and other functions". Nature Reviews. Neuroscience. 9 (10): 747–58. doi:10.1038/nrn2493. PMC 4418456. PMID 18802445.
  14. ^ Keller PA, Compan V, Bockaert J, Giacobino JP, Charnay Y, Bouras C, et al. (June 2006). "Characterization and localization of cocaine- and amphetamine-regulated transcript (CART) binding sites". Peptides. 27 (6): 1328–34. doi:10.1016/j.peptides.2005.10.016. PMID 16309793. S2CID 27440114.
  15. ^ Wierup N, Kuhar M, Nilsson BO, Mulder H, Ekblad E, Sundler F (February 2004). "Cocaine- and amphetamine-regulated transcript (CART) is expressed in several islet cell types during rat development". J. Histochem. Cytochem. 52 (2): 169–77. doi:10.1177/002215540405200204. PMID 14729868.
  16. ^ Kay JN, De la Huerta I, Kim IJ, Zhang Y, Yamagata M, Chu MW, et al. (May 2011). "Retinal ganglion cells with distinct directional preferences differ in molecular identity, structure, and central projections". The Journal of Neuroscience. 31 (21): 7753–62. doi:10.1523/JNEUROSCI.0907-11.2011. PMC 3108146. PMID 21613488.
  17. ^ Dandekar MP, Singru PS, Kokare DM, Lechan RM, Thim L, Clausen JT, et al. (April 2008). "Importance of cocaine- and amphetamine-regulated transcript peptide in the central nucleus of amygdala in anxiogenic responses induced by ethanol withdrawal". Neuropsychopharmacology. 33 (5): 1127–36. doi:10.1038/sj.npp.1301516. PMID 17637604.
  18. ^ Couceyro PR, Evans C, McKinzie A, Mitchell D, Dube M, Hagshenas L, et al. (December 2005). "Cocaine- and amphetamine-regulated transcript (CART) peptides modulate the locomotor and motivational properties of psychostimulants". J. Pharmacol. Exp. Ther. 315 (3): 1091–100. doi:10.1124/jpet.105.091678. PMID 16099925. S2CID 15989891.
  19. ^ Kuhar MJ, Jaworski JN, Hubert GW, Philpot KB, Dominguez G (2005). "Cocaine- and amphetamine-regulated transcript peptides play a role in drug abuse and are potential therapeutic targets". AAPS J. 7 (1): E259–65. doi:10.1208/aapsj070125. PMC 2751515. PMID 16146347.
  20. ^ Yu C, Zhou X, Fu Q, Peng Q, Oh KW, Hu Z (2017). "A New Insight into the Role of CART in Cocaine Reward: Involvement of CaMKII and Inhibitory G-Protein Coupled Receptor Signaling". Frontiers in Cellular Neuroscience. 11: 244. doi:10.3389/fncel.2017.00244. PMC 5559471. PMID 28860971.
  21. ^ Nakhate KT, Kokare DM, Singru PS, Subhedar NK (June 2011). "Central regulation of feeding behavior during social isolation of rat: evidence for the role of endogenous CART system". Int J Obes (Lond). 35 (6): 773–84. doi:10.1038/ijo.2010.231. PMID 21060312. S2CID 23362880.
  22. ^ Dandekar MP, Singru PS, Kokare DM, Subhedar NK (April 2009). "Cocaine- and amphetamine-regulated transcript peptide plays a role in the manifestation of depression: social isolation and olfactory bulbectomy models reveal unifying principles". Neuropsychopharmacology. 34 (5): 1288–300. doi:10.1038/npp.2008.201. PMID 19005467.
  23. ^ Upadhya MA, Nakhate KT, Kokare DM, Singh U, Singru PS, Subhedar NK (March 2012). "CART peptide in the nucleus accumbens shell acts downstream to dopamine and mediates the reward and reinforcement actions of morphine". Neuropharmacology. 62 (4): 1823–33. doi:10.1016/j.neuropharm.2011.12.004. PMID 22186082. S2CID 10500678.
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  25. ^ "Cocaine Studies Reveal New Medications For Addiction; How Brain Regulates Hunger". ScienceDaily LLC. 27 October 1997. Retrieved 11 February 2009.
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  32. ^ Ye C, Zhou Q, Lin S, Yang W, Cai X, Mai Y, et al. (March 2024). "High expression of GPR160 in prostate cancer is unrelated to CARTp-mediated signaling pathways". Acta Pharmaceutica Sinica. B. 14 (3): 1467–1471. doi:10.1016/j.apsb.2023.11.025. PMC 10935005. PMID 38487007.
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