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Orexin B (mouse, rat)

Names

[ CAS No. ]:
202801-92-1

[ Name ]:
Orexin B (mouse, rat)

[Synonym ]:
L-Arginyl-L-prolylglycyl-L-prolyl-L-prolylglycyl-L-leucyl-L-glutaminylglycyl-L-arginyl-L-leucyl-L-glutaminyl-L-arginyl-L-leucyl-L-leucyl-L-glutaminyl-L-alanyl-L-asparaginylglycyl-L-asparaginyl-L-histidyl-L-alanyl-L-alanylglycyl-L-isoleucyl-L-leucyl-L-threonyl-L-methioninamide
L-Methioninamide, L-arginyl-L-prolylglycyl-L-prolyl-L-prolylglycyl-L-leucyl-L-glutaminylglycyl-L-arginyl-L-leucyl-L-glutaminyl-L-arginyl-L-leucyl-L-leucyl-L-glutaminyl-L-alanyl-L-asparaginylglycyl-L-asparaginyl-L-histidyl-L-alanyl-L-alanylglycyl-L-isoleucyl-L-leucyl-L-threonyl-
Orexin B, rat, mouse

Biological Activity

[Description]:

Orexin B, rat, mouse is an endogenous agonist at Orexin receptor with Kis of 420 and 36 nM for OX1 and OX2, respectively.

[Related Catalog]:

Signaling Pathways >> GPCR/G Protein >> Orexin Receptor (OX Receptor)
Research Areas >> Neurological Disease
Peptides

[Target]

Ki: 420 nM (OX1), 36 nM (OX2)[1]


[In Vitro]

Orexin B is derived by proteolytic amino acid precursor, prepro-orexin, which is encoded by a gene localized to chromosome 17q21 in humans. In radioligand binding studies, Orexin B has a higher affinity for the OX2 receptor[1]. Human Orexin B has two amino acid substitutions when compared with the rodent sequence. OX2 receptor is indeed a high-affinity receptor for human orexin B, with an IC50 of 36 nM in the binding assay and an EC50 of 60 nM in the [Ca2+]i transient assay. Human Orexin B has significantly lower affinity for the human OX1: the calculated IC50 in the competitive binding assay and the EC50 in the [Ca2+]i transient assay are 420 nM and 2500 nM for human orexin-B, respectively[2].

[In Vivo]

Human Orexin B significantly augments food intake; at the 2 hr time point, 5- and 12-fold stimulation of food consumption is observed by 3 nM and 30 nM orexin-B, respectively[2].

[Animal admin]

Rats[2] 3 nM and 30 nM of synthetic human Orexin B is administered in a 5 mL bolus through a catheter placed in the left lateral ventricle of Male Wistar rats (180–200 g) in early light phase. Cumulative food consumption is observed and plotted over the period of 4 hr after injection[2].

[References]

[1]. Smart D, et al. Orexins: a new family of neuropeptides. Br J Anaesth. 1999 Nov;83(5):695-7.

[2]. Sakurai T, et al. Orexins and orexin receptors: a family of hypothalamic neuropeptides and G protein-coupled receptors that regulate feeding behavior. Cell. 1998 Feb 20;92(4):573-85.


[Related Small Molecules]

SB 334867 | lemborexant | Almorexant HCI | Filorexant | Orexin 2 Receptor Agonist | TCS-OX2-29 | MK-1064 | SB-674042 | GSK1059865 | IPSU | SB408124 | MK-3697 | Nemorexant | SB-649868 | TCS 1102

Chemical & Physical Properties

[ Density]:
1.5±0.1 g/cm3

[ Molecular Formula ]:
C126H215N45O34S

[ Molecular Weight ]:
2936.401

[ Exact Mass ]:
2934.619873

[ LogP ]:
-9.21

[ Index of Refraction ]:
1.670

[ Storage condition ]:
−20°C

[ Water Solubility ]:
Soluble in 1% acetic acid at 1mg/ml

Safety Information

[ WGK Germany ]:
3

Related Compounds