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H-Phe-Met-Arg-Phe-NH2 acetate salt

Names

[ CAS No. ]:
152165-14-5

[ Name ]:
H-Phe-Met-Arg-Phe-NH2 acetate salt

[Synonym ]:
h-phe-met-arg-phe-nh2 acoh
fmrf-nh2
phe-met-arg-phe-nh2
molluscan cardioexcitatory peptide
fmrfamide acetate salt
phe-met-arg-phe-nh2 1/2acoh 2h2o
h-phe-met-arg-phe-nh2
phe-met-arg-phe amide
fmrf-amide 1 1/2acoh 2h2o

Biological Activity

[Description]:

Phe-Met-Arg-Phe, amide acetate dose dependently (ED50=23 nM) activates a K+ current in the peptidergic caudodorsal neurons[1].

[Related Catalog]:

Research Areas >> Neurological Disease
Signaling Pathways >> Membrane Transporter/Ion Channel >> Potassium Channel

[Target]

ED50: 23 nM (K+ current)[1]


[In Vitro]

In the molluscan central nervous system, Phe-Met-Arg-Phe, amide (FMRFa) acetate acts on K+ channels in sensory, motor-, and neuroendocrine neurones. Phe-Met-Arg-Phe, amide acetate activates a novel K+ current that is characterized by a combined voltage- and receptor-dependent gating mechanism, with both factors being necessary for opening of the channels[1]. Phe-Met-Arg-Phe, amide (1 μM) acetate significantly inhibits glucose stimulated (300 mg/dL) insulin release (p<0.005) and somatostatin release (p<0.01) from the isolated perfused pancreas[2]. Phe-Met-Arg-Phe, amide (FMRF-NH2) (1 and 10 μM) acetate is without effect on glucagon secretion, either in low glucose (50 mg/dL), high glucose (300 mg/dL), or during arginine stimulation (5 mM)[2].

[In Vivo]

Phe-Met-Arg-Phe, amide (FMRFamide) acetate stimulates growth hormone secretion in conscious OVX rats. The presence of Phe-Met-Arg-Phe, amide-like immunoreactivity in neuronal elements in the hypothalamus suggested a role for this in the hypothalamic control of the anterior pituitary function. The injection of 200 ng (313.8 pM) of FMRFamide (in 2 uL) produces a significantly increased plasma GH 15 min after injection. The GH-increasing effect of 400-800 ng (627-1255 pM) of FMRFamide is already developed after 5 min and lasted up to 30 min[3].

[References]

[1]. Kits KS, et al. Phe-Met-Arg-Phe-amide activates a novel voltage-dependent K+ current through a lipoxygenasepathway in molluscan neurones. J Gen Physiol. 1997 Nov;110(5):611-28.  

[2]. Sorenson RL, et al. Phe-met-arg-phe-amide (FMRF-NH2) inhibits insulin and somatostatin secretion and anti-FMRF-NH2 sera detects pancreatic polypeptide cells in the rat islet. Peptides. 1984 Jul-Aug;5(4):777-82.  

[3]. Ottlecz A, et al. Phe-Met-Arg-Phe-amide (FMRFamide) stimulated growth hormone secretion in conscious OVX rats. Neuropeptides. 1987 Feb-Mar;9(2):161-7.  

Chemical & Physical Properties

[ Molecular Formula ]:
C31H46N8O6S

[ Molecular Weight ]:
658.81

[ Exact Mass ]:
598.30500

[ PSA ]:
243.61000

[ LogP ]:
3.51940

Related Compounds