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Low molecular weight peptidomimetic growth hormone secretagogues

a growth hormone and low molecular weight technology, applied in the field of new drugs, can solve the problems of peptides, lack of specificity for gh release, oral availability and specificity, etc., and achieve the effect of less effect on blood glucose and reduced effect on insulin sensitivity

Inactive Publication Date: 2002-08-15
SOMERS TODD C +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0218] The present invention is based on the discovery of several new classes of small peptidomimetics that cause the release of growth hormone in mammals. It is a preferable object of the present invention to provide agents that are selective for GH release and have suitable safety and efficacy for chronic administration to mammals. In a more prefered embodiment, the present invention provides compounds which are suitable for oral, intranasal, or pulmonary delivery. It is an aim of the most prefered embodiments of the present invention to provide compounds that are superior to the prior art by the above criteria. It is further prefered that the compounds be readily synthesizable in optically pure form where neccessary.
[0234] Moreover, when the substucture A, B, and / or C are comprised of the amide function C(.dbd.O)NH, the present invention teaches that the NH is replacable by NMe with retention of biological activity. It is therefore a most prefered embodiment of the present invention that the groups R.sup.B, R.sup.C, and R.sup.D be independently selected from methyl and hydrogen, a particular combination chosen so as to optimize for desired properties of the molecule, such as stability and lipophilicity.
[0280] These experiments shows that (inip) bbFK-NH.sub.2 has a range of anabolic effects in normal young female rats. This anabolic effect was seen by increases in body weight, liver weight, spleen weight and thymus weight, with a tendency for heart weight to also increase compared to excipient treated control rats. The effect of the GHRP (inip) bbFK-NH.sub.2 was also dose related with doses of 4, 20 and 100 .mu.g / rat / day all being effective anabolic doses. In these experiments the two highest doses of (inip) bbFK-NH.sub.2 had equivalent effects. Therefore as little as 166 ng / hr of (inip) bbFK-NH.sub.2 (for 200 g rats; 0.83 .mu.g / kg / hr) was effective at inducing an anabolic effect.
[0284] The GHRP (inip) bbFK-NH.sub.2 was also effective at stimulating an anabolic response when delivered by continuous infusion. The delivery of (inip) bbFK-NH.sub.2 by SC infusion is an effective treatment and a similar effect could be achieved by any method that maintained a near continuous exposure of the instant GHRP's. For example, oral delivery, transdermal patch, or other delivery systems designed to maintain a continuous exposure to these GHRP's would be appropriate.
[0288] In contrast to infusions, periodic injections of (inip) bbFK-NH.sub.2 maintained a significant growth response. Twice daily injections of 10 .mu.g of the GHRP (inip) bbFK-NH.sub.2 produced a large (30 gram) weight gain in adult female rats.

Problems solved by technology

These peptides, however, generally lack specificity for GH release.
A number of structurally diverse nonpeptidyl GH secretagogues (e.g. Talipexole and Clonidine) are reported to stimulate GH release in vitro and in vivo, but these compounds are believed to mediate their effect through cholinergic, adrenergic, dopaminergic or serotonergic pathways and thus also lack GH releasing specificity.
A number of these compounds (e.g., "GHRP-6" and L-692,429) are reported to be safe and effective in promoting endogenous GH release in humans, however, there remain problems with oral availability and specificity.

Method used

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  • Low molecular weight peptidomimetic growth hormone secretagogues
  • Low molecular weight peptidomimetic growth hormone secretagogues
  • Low molecular weight peptidomimetic growth hormone secretagogues

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0391] 48

Method A

[0392] Step A: (N-.epsilon.-BOC)Lys-(Am-resin)

[0393] FMOC-Am-resin (10 g, 0.50 mmol / g, 5.0 mmol) was deblocked by agitating with 20% piperidine in DMA for 15 min followed by successive washes with DMA (5.times.) and DCM (1.times.). The resin gave a positive test with ninhydrin. A solution of 9.37 g (20.0 mmol) of FMOC-(N-.epsilon.-BOC)-L-Lysine, 8.85 g (20.0 mmol) of BOP, and 3.31 mL (30.0 mmol) of NMM in 30 mL of DMA was added and the solution agitated for 1 h. The resin was washed (5.times.) with DMA and shown to give a negative ninhydrin test. The N-.alpha.-FMOC protecting group was removed with 20% piperidine in DMA for 15 min, followed by successive washings with DMA (5.times.) and DCM (1.times.) to give (N-.epsilon.-BOC)Lys-(Am-r-esin).

[0394] Step B: Phe-(N-.epsilon.-BOC)Lys-(Am-resin)

[0395] A solution of FMOC-L-Phenylalanine (7.75 g, 20.0 mmol) and BOP (8.85 g, 20.0 mmol) in 50 mL of DMA / DCM (1:1) was preactivated for 10 min and added to the (N-.epsilon.-BOC)...

example 2

[0432] 49

[0433] FMOC-D.beta.Nal-D.beta.Nal-Phe-(N-.epsilon.-BOC)Lys-(Am-resin) (1.0 g, 0.32 mmol), from Example 1, Method A, step D, was swelled with DCM for 15 min, deblocked with 20% piperidine in DMA for 15 min, and washed with DMA (5.times.) and DCM (1.times.) to give D.beta.Nal-D.beta.Nal-Phe-(N-.e-psilon.-BOC)Lys-(Am-resin), displaying a positive ninhydrin test. A preactivated solution of N-BOC-4-aminobutyric acid (403 mg, 1.98 mmol), 875 mg (1.98 mmol) of BOP, and 0.33 mL (2.97 mmol) of NMM in 15 mL of DMA / DCM (1:1) was added. After agitation for 1 h, the resin was washed with DMA (5.times., ninhydrin negative), DCM (3.times.), MeOH (2.times.) and dried in vacuo. The dry resin was suspended in 10 mL of TFA and 0.50 mL of triethylsilane added. The mixture was agitated for 1 h, concentrated in vacuo, and the resin washed with ether. The crude peptide was recovered from the resin by washing with 10% aq HOAc, followed by acetonitrile. The combined filtrates were lyophilized to gi...

example 3

[0434] 50

[0435] Step A: BOC-4-(N-Methylamino)butyric Acid

[0436] To a 0.degree. C. solution of 5.00 g (24.6 mmol) of BOC-4-aminobutyric acid in 75 mL of dry THF, was added 12.2 mL (197 mmol) of methyl iodide followed by 2.95 g (73.8 mmol, 60% dispersion in mineral oil) of sodium hydride, portionwise. The reaction was rapidly stirred at room temperature for 12 h and quenched by the careful addition of water. The mixture was partitioned between ether and water, and the organic phase extracted with 1 N aq sodium bicarbonate. The combined aqueous phases were chilled and acidified to pH 3 with 1 N sodium hydrogen sulfate, then extracted with two portions of ethyl acetate. The combined organics were washed successively with water, 5% aq sodium thiosulfate, water, brine, and then dried over anhydrous magnesium sulfate. Concentration in vacuo afforded 5.00 g (94%) of BOC-4-(N-methylamino)buty-ric acid. .sup.1H NMR: (300 MHz, CDCl.sub.3) .delta. 3.28 (2H, bt, J=7 Hz), 2.84 (3H, s), 2.36 (2H, ...

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Abstract

The present invention comprises growth hormone releasing peptides / peptidomimetics (GHRP) capable of causing release of growth hormone from the pituitary. Compositions containing the GHRP's of this invention are used to promote growth in mammals either alone or in combination with other growth promoting compounds, especially IGF-1. In a method of this invention GHRP's in combination with IGF-1 are used to treat Type II diabetes. An exemplary compound of this invention is provided below.

Description

[0001] The invention relates to synthetic peptidomimetics having growth hormone releasing activity in mammals. The peptidomimetics of this invention are used to stimulate the release of endogenous growth hormone (GH) in mammals needing elevation of serum growth hormone levels.[0002] GH secretion is known to be inhibited by the hypothalamic hormone somatostatin (SS) and stimulated by GH-releasing hormone (GHRH) in all mammalian species studied including humans. In man, GH is released from the anterior pituitary somatotrophs in pulsatile secretory bursts occurring about 4-8 times in each 24 hour period (Devesa, J., et al., Trends Endocrinol Metab. 3:175-183 [1992] and Mason, W. T., et al., Acta Paediatr Suppl 388:84-92 [1993]). This episodic release pattern seems to be optimal for inducing the physiological effects of GH since many target tissues appear to be more sensitive to the frequency than the total amount of GH arriving at the target tissue (Robinson and Clark Growth Hormone: B...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/00A61K38/25A61K38/27A61K38/30C07D209/20C07D211/62C07D401/12C07D403/12C07K5/02C07K5/087C07K5/107C07K5/117C07K7/02C07K7/06C07K14/60C07K16/22C07K16/26
CPCA61K38/25A61K38/27A61K38/30C07D209/20C07D211/62C07D401/12C07D403/12C07K5/0202C07K5/0205C07K5/0207C07K5/021C07K5/0812C07K5/1016C07K5/1024C07K7/02C07K7/06C07K14/60C07K16/22A61K2300/00
Inventor SOMERS, TODD C.ELIAS, KATHLEEN A.CLARK, ROSS G.MCDOWELL, ROBERT S.STANLEY, MARK S.BURNIER, JOHN P.RAWSON, THOMAS E.
Owner SOMERS TODD C
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