Abstract
Regulation of energy balance is extremely complex, and involves multiple systems of hormones, neurotransmitters, receptors, and intracellular signals. As data have accumulated over the last two decades, the CNS melanocortin system is now identified as a prominent integrative network of energy balance controls in the mammalian brain. Here, we will review findings from rat and mouse models, which have provided an important framework in which to study melanocortin function. Perhaps most importantly, this review attempts for the first time to summarize recent advances in our understanding of the intracellular signaling pathways thought to mediate the action of melanocortin neurons and peptides in control of longterm energy balance. Special attention will be paid to the roles of MC4R/MC3R, as well as downstream neurotransmitters within forebrain and hindbrain structures that illustrate the distributed control of melanocortin signaling in energy balance. In addition, distinctions and controversy between rodent species will be discussed.
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Abbreviations
- AY :
-
Agouti yellow
- AAV:
-
Adeno-associated virus
- ACTH:
-
Adrenocorticotropic hormone
- AgRP:
-
Agouti-related protein
- AMPK:
-
Adenosine monophosphate protein kinase
- BAT:
-
Brown adipose tissue
- BDNF:
-
Brain-derived neurotrophic factor
- CART:
-
Cocaine- and amphetamine-regulated transcript
- CCK:
-
Cholecystokinin
- CNS:
-
Central nervous system
- CRH:
-
Corticotropin-releasing hormone
- DIO:
-
Diet-induced obesity
- DVC:
-
Dorsal vagal complex
- FI:
-
Food intake
- Fos-Li:
-
Fos-like immunoreactivity
- GABA:
-
γ-Aminobutyric acid
- GK:
-
Glucokinase
- GLP-1:
-
Glucagon-like peptide 1
- HFD:
-
High-fat diet
- IBAT:
-
Intrascapular brown adipose tissue
- ICV:
-
Intracerebroventricular
- IR:
-
Insulin receptor
- LHA:
-
Lateral hypothalamic area
- LPS:
-
Lipopolysaccharide
- MAPK/ERK:
-
Mitogen-activated protein kinase (a.k.a. = extracellular signal-regulated kinase)
- MCR:
-
Melanocortin receptor
- MC3R:
-
Melanocortin 3 receptor
- MC4R:
-
Melanocortin 4 receptor
- MSH:
-
Melanocyte-stimulating hormone
- MTII:
-
Melanotan 2
- NPY:
-
Neuropeptide Y
- NR:
-
Not reported
- NT-4:
-
Neurotrophin-4
- NTS:
-
Nucleus tractus solitarius
- NUCB2:
-
NEFA/nucleobindin2
- PI3 K:
-
Phosphatidyl inositol 3-kinase
- PBN:
-
Parabrachial nucleus
- PC:
-
Subtilisin-related prohormone convertase
- PIP3:
-
Phosphatidylinositol (3,4,5)-trisphosphate
- POMC:
-
Proopiomelanocortin
- PTP1B:
-
Protein tyrosine phosphatase 1B
- PVH:
-
Paraventricular nucleus of the hypothalamus
- RER:
-
Respiratory exchange ratio
- RMR:
-
Resting metabolic rate
- RQ:
-
Respiratory quotient
- SHP2:
-
SH2 domain-containing protein tyrosine phosphatase-2
- SIM1:
-
Single-minded gene 1
- SNS:
-
Sympathetic nervous system
- SOCS3:
-
Suppressor of cytokine signaling 3
- SON:
-
Supraoptic nucleus
- STAT3:
-
Signal transducer and activator of transcription 3
- trkB:
-
Tropomysosin-receptor kinase-B
- WAT:
-
White adipose tissue
- Tg:
-
Transgenic
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De Jonghe, B.C., Hayes, M.R. & Bence, K.K. Melanocortin control of energy balance: evidence from rodent models. Cell. Mol. Life Sci. 68, 2569–2588 (2011). https://doi.org/10.1007/s00018-011-0707-5
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DOI: https://doi.org/10.1007/s00018-011-0707-5