Use Of A Ghrelin Agonist To Improve Catabolic Effects Of Glucocorticoid Treatment

a glucocorticoid and ghrelin technology, applied in the field of steroid hormones, can solve the problems of affecting the speed of bone growth, inhibiting growth hormone secretion, and compromising bone accretion, so as to counteract the catabolic

Inactive Publication Date: 2010-09-09
SOC DE CONSEILS DE RECH & DAPPLICATIONS SCI SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glucocorticoids, however, suppress growth hormone secretion.
In addition, it has been found that dexamethasone therapy may compromise the accretion of bone mineral and this affect the velocity of bone growth, even when energy intake increases (Weiler, H. A. et al, Longitudinal Assessment of Growth and Bone Mineral Accretion in Prematurely Born Infants Treated for Chronic Lung Disease with Dexamethasone, Early Hum. Dev., 1997, 47:271-86 and Gibson, A. T. et al., Growth Retardation After Dexamethasone Administration: Assessment by Knemometry, Arch. Dis. Child, 1993, 69:505-9).
In addition, dexamethasone-treated children were observed to evidence significantly poorer motor skills and motor coordination as well as poorer visual-motor integration as compared to children not treated with dexamethasone.
Recent studies have shown that glucocorticoid administration, while alleviating some symptoms of asthma, may also lead to airway damage or airway remodeling (see Dorscheid, D. R. et al., “Apoptosis of airway epithelial cells induced by corticosteroids”, Am. J. Respir. Crit.
The catabolic effects of this disease results in limited muscle capacity which leads to pronounced physical weakness.
The skin becomes thin, bruises easily and heals poorly when bruised or cut.
The heightened glucocorticoid levels associated with Cushing's syndrome, over time, results in chronic, elevated blood pressure, osteoporosis, diminished resistance to infections, the development of kidney stones and diabetes.
Chronic glucocorticoid excess associated with Cushing's syndrome, left untreated, increases the risk of premature death.
Different studies suggest that the detrimental effects of glucocorticoid can be variably overcome by GH treatment, but long-term GH therapy also has the potential for adverse effects and requires further surveillance and study.

Method used

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  • Use Of A Ghrelin Agonist To Improve Catabolic Effects Of Glucocorticoid Treatment
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  • Use Of A Ghrelin Agonist To Improve Catabolic Effects Of Glucocorticoid Treatment

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Experimental program
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example 1

Synthesis of Ghrelin Analogs

[0121]The preferred embodiment [Aib2, Glu3(NH-hexyl)]hGhrelin(1-28)-NHz, was synthesized on an Applied Biosystems® (Foster City, Calif.) model 430A® peptide synthesizer which was modified to do accelerated Boc-chemistry solid phase peptide synthesis (Schnolzer, et al., Int. J. Peptide Protein Res., 1992, 40:180). A 4-methylbenzhydrylamine (hereinafter referred to as “MBHA”) resin (Peninsula, Belmont, Calif.) with the substitution of 0.91 mmol / g was used. The Boc amino acids (Midwest Bio-Tech®, Fishers, Ind.; Novabiochem®, San Diego, Calif.) were used with the following side chain protection: Boc-Ala-OH, Boc-Arg(Tos)-OH, Boc-His(DNP)-OH, Boc-Val-OH, Boc-Leu-OH, Boc-Gly-OH, Boc-Gln-OH, Boc-Lys(2ClZ)-OH, Boc-Ser(Bzl)-OH, Boc-Phe-OH, Boc-Glu(OcHex)-OH and Boc-Pro-OH. With respect to the substituted positions, Boc-Gly-OH was used as the residue at position 1, Fmoc-Aib-OH was used as the residue at position 2, and Fmoc-Glu(OtBu)-OH (Novabiochem®, San Diego, Cal...

example 2

In Vitro Studies: Phosphoinositide Turnover

[0126]CHO-K1 cells, expressing the human recombinant GHS-1a receptor were harvested and resuspended in a phosphate-buffered saline solution containing 25 mM glucose and 75 mM sucrose (PBS+GS) and pre-incubated with 25 μCi / ml myo[3H]inositol for 60 min / 37° C. The cells were washed, resuspended in PBS+GS, and incubated with LiCl (100 mM) and GHS peptides in a final volume of 0.30 ml. The reaction was termined by the addition of chloroform / methanol (1:2) and the total [3H]inositol phosphates were isolated as previously described (Snider et al. J. Neurochem. 1986, 47:1214-1218; see also FIG. 1).

example 3

In Vivo Studies

[0127]3A) Dose-Related Effects of [Aib2, Glu3(NH-hexyl)]hGhrelin(1-28)-NH2 on GH Secretion in Freely Moving Rats

[0128]During the study, the animals were maintained in accordance with the guidelines of the Italian Ministry of Health for the care and use of laboratory animals (Decreto legge 116 / 92). Young male Sprague-Dawley rats (Rattus norvegicus) were used in this study. Animals were obtained from Harlan, Italy (S. Pietro al Natisone, Italy) and were kept in a temperature-controlled environment (21-23° C.) under 12:12 hour light:dark exposure continuous period wherein light exposure began at 0800 and ended at 2000 h. Animals were provided ad libitum water and food consisting of standard pellet chow (Piccioni, Gessate-Milano, Italy) containing at least 3% fat, 56% carbohydrate and 19% protein. The total calorie content was approximately 3200 calories / kg of pellets.

[0129]Rats (200-250 g) were anesthetized with chlorohydrate (500 mg / kg) and fit with a jugular-right atri...

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Abstract

A method and pharmaceutical composition for inhibiting the effect of glucocorticoids, particularly dexamethasone, which suppress growth hormone secretion, by administering ghrelin or a ghrelin analogue, specifically [Aib2, Glu3(NH-hexyl)]hGhrelin(1-28)-NH2, to counteract the catabolic effects of said dexamethasone and other natural glucocorticoids.

Description

BACKGROUND OF THE INVENTION[0001]Glucocorticoids are a class of steroid hormones characterized by an ability to bind with the cortisol receptor and trigger similar effects. Glucocorticoids have potent anti-inflammatory and immunosuppressive properties and as such are the best-known class of anti-inflammatory active ingredients. Owing to their broad range of uses and their great anti-inflammatory action, corticoid preparations are therapeutic agents of first choice in a wide variety of inflammatory diseases, such as, for example, diseases of the rheumatoid group, allergies, inflammatory diseases of the lungs, heart, and intestines, bronchial asthma, hyperproliferative diseases of the skin (psoriasis), eczemas, auto-immune diseases, or states of shock.[0002]Dexamethasone, a synthetic member of the glucocorticoid class of hormones which exhibits anti-inflammatory and immunosuppressive properties which are 40 times more potent than naturally-occurring hydrocortisone and having the follo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/22A61P5/00
CPCA61K38/25A61P3/00A61P5/00A61P5/44A61P19/08
Inventor GIOVANNI, TULIPANO
Owner SOC DE CONSEILS DE RECH & DAPPLICATIONS SCI SAS
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