ghrp-6

[klaas]

Deze shit kan je zeer goed gebruiken post hgh-cycle, stimuleert gh productie en tevens ook nog eens je eetlust...interessant goedje dus:

Growth Hormone Releasing Peptide - GHRP-6

GHRP-6 (Growth Hormone Releasing Peptide – 6) is a 28-amino-acid peptide that signals the human body to begin secreting growth-hormone (GH). Growth Hormone in the human body has host of beneficial effects such as decreased body fat, increased muscle, and increased strength and stamina. The Growth Hormone secreted by the body then causes the liver to secrete the highly anabolic hormone known as IGF-1. IGF-1 also contributes greatly to the body’s ability to burn fat and build muscle. Thus, in several studies, when subjects were given GHRP-6, their muscle mass increased and their body fat was reduced significantly.

Both Growth Hormone as well as IGF-1 also has several beneficial effects on collagen and bone tissue growth, and it would be expected that by using GHRP-6, users would experience the full spectrum of benefits typically seen with the use of GH and possibly the concurrent use of both GH and IGF-1.

In several studies done in both humans and rodents, it has further been found that GHRP-6 has a rapid effect on Ghrelin. Ghrelin would appear to be involved in excess weight gain, adiposity, and insulin resistance. This occurs during both high fat as well as high carbohydrate diets. GHRP-6 is a Ghrelin antagonist, meaning that it actually fights against Grehlin in the human body, and this may be one possible mechanism by which it helps to reduce bodyfat.

Growth hormone (GH) has been also been known to enhance immune responses and stimulate the immune system, whether directly or through the insulin like growth factor-1 signaled secretion caused by GH. GHRP-6 has also been shown to have this immune enhancing effect, particularly older subjects.

Bodybuilders and athletes have recently started using GHRP-6 in an effort to build more muscle and burn more fat. Typically, it is used on (or instead of) a cycle of anabolic steroids. However, some of the more creative users of this compound have been including it in their Post Cycle Therapy instead of GH, and even more have been cycling GHRP-6 in the off weeks from their IGF/GH cycles, in an effort to kick-start their body into producing their own natural GH & IGF, but at the same time getting the same results as if they remained on the GH/IGF cycle.


Blocked growth hormone-releasing peptide (GHRP-6)-induced GH secretion and absence of the synergic action of GHRP-6 plus GH-releasing hormone in patients with hypothalamopituitary disconnection: evidence that GHRP- 6 main action is exerted at the hypothalamic level
V Popovic, S Damjanovic, D Micic, M Djurovic, C Dieguez and FF Casanueva
Institute of Endocrinology, University Clinical Center, Belgrade, Yugoslavia.

GH-releasing peptide (GHRP-6; His-D Trp-Ala-Trp-D Phe-Lys-NH2) is a synthetic compound that releases GH in a specific and dose-related manner through mechanisms and a point of action that are mostly unknown but different from those of GHRH. In man, GHRP-6 is more efficacious than GHRH, and a striking synergistic action on GH release is observed when GHRP-6 and GHRH are administered simultaneously. Based on such a synergistic action, it has been hypothesized that GHRP-6 acts through a double mechanism by actions exerted both at the pituitary and hypothalamic levels. The aim of the present study was 2-fold: 1) to further characterize the mechanism of action and synergistic effects of GHRP-6; and 2) to study its action in patients with hypothalamopituitary disconnection. Twelve patients with different neuroendocrine pathologies leading to a state of hypothalamopituitary disconnection (functional stalk section) and 11 age- and sex-matched normal controls were studied. Each subject underwent 3 tests on separate occasions, being challenged with GHRH (100 micrograms, i.v.), GHRP-6 (90 micrograms, i.v.), or GHRH plus GHRP-6. GH was analyzed as the area under the curve (mean +/- SE, micrograms per L/120 min). In normal subjects GH secretion was 483.7 +/- 99.2 after GHRH, 1434.8 +/- 393.0 after GHRP-6, and 3771.5 +/- 399.6 after GHRH plus GHRP-6; the level of GH secreted after GHRH plus GHRP-6 treatment was significantly (P < 0.05) higher than after the arithmetic sum of GH levels after both compounds administered separately. In the group of patients with hypothalamopituitary disconnection, the level of GH secreted after GHRH was similar to that in controls (423.4 +/- 62.8); however, a complete blockade was observed after GHRP-6 (97.3 +/- 7.9), significantly (P < 0.05) lower than after GHRH as well as lower than the GHRP-6-induced GH release in control subjects (P < 0.01). After GHRH plus GHRP-6, the patients with hypothalamopituitary disconnection showed severely reduced secretion (745.3 +/- 67.6; P < 0.01 vs. controls), a value that was not significantly different from the arithmetic addition of levels produced by both compounds administered separately.(ABSTRACT TRUNCATED AT 400 WORDS)

Clinical and experimental effects of growth hormone secretagogues on various organ systems.

Svensson JA, Bengtsson B.

Research Centre for Endocrinology and Metabolism, Sahlgrenska University Hospital, Goteborg, Sweden.

A new class of growth hormone (GH) secretagogues (GHS) has been developed. In rats, the GHS hexarelin exerts cardioprotective effects. In humans, GHS increase growth velocity in children with short stature/GH deficiency. In adults, a combined infusion of GH releasing peptide-2 and thyrotropin releasing hormone increases circulating concentrations of GH as well as that of insulin-like growth factor-I. In healthy volunteers, oral GHS administration reverses diet-induced catabolism, and in healthy obese men, oral GHS treatment increases fat-free mass. However, little is known about the possible direct effects of GHS and there are few long-term studies. Therefore, it is not yet possible to fully evaluate the use of GHS. Copyright Copyright 1999 S. Karger AG, Basel

Publication Types:
Review

PMID: 10592439 [PubMed - indexed for MEDLINE]

Effects of growth hormone-releasing peptide-6 on the nocturnal secretion of GH, ACTH and cortisol and on the sleep EEG in man: role of routes of administration.

Frieboes RM, Murck H, Antonijevic IA, Steiger A.

Max Planck Institute of Psychiatry, Munich, Germany.

After repeated intravenous (i.v.) boluses of growth hormone-releasing peptide-6 (GHRP-6) we found recently increases of growth hormone (GH), corticotropin (ACTH) and cortisol levels and of the amount of stage 2 sleep. In clinical use, oral (p.o.), intranasal (i.n.) and sublingual (s.l.) routes of administration have advantages over i.v. administration. We compared the sleep-endocrine effects of 300 microg/kg of body weight (b.w.) GHRP-6 in enteric-coated capsules given p.o. at 21.00 h and of 30 microg/kg GHRP-6 i.n. or 30 microg/kg GHRP-6 sl. given at 22.45 h in normal young male controls with placebo conditions. After GHRP-6 p.o. secretion of GH, ACTH and cortisol remained unchanged. The only effect of GHRP-6 s.l. was a trend toward an increase in GH in the first half of the night. GHRP-6 i.n. prompted a significant increase in GH concentration during the total night and a trend toward an increase in ACTH secretion during the first half of the night, whereas cortisol secretion remained unchanged. Furthermore, after GHRP-6 i.n., sleep stage 2 increased in the second half of the night by trend, and spectral analysis of total night non-rapid eye movement (REM) sleep revealed a decrease of delta power by trend. In contrast sleep stage 2 decreased during the second half of the night after GHRP-6 p.o. Our data demonstrate that GHRP-6 is capable of modulating GH and ACTH secretion as well as sleep. However, the effects depend upon dosage, duration and route of administration.

Publication Types:
Clinical Trial

PMID: 10336729 [PubMed - indexed for MEDLINE]

Growth hormone-releasing peptides.

Ghigo E, Arvat E, Muccioli G, Camanni F.

Department of Internal Medicine, University of Turin, Italy.

Growth hormone-releasing peptides (GHRPs) are synthetic, non-natural peptides endowed with potent stimulatory effects on somatotrope secretion in animals and humans. They have no structural homology with GHRH and act via specific receptors present either at the pituitary or the hypothalamic level both in animals and in humans. The GHRP receptor has recently been cloned and, interestingly, it does not show sequence homology with other G-protein-coupled receptors known so far. This evidence strongly suggests the existence of a natural GHRP-like ligand which, however, has not yet been found. The mechanisms underlying the GHRP effect are still unclear. At present, several data favor the hypothesis that GHRPs could act by counteracting somatostatinergic activity both at the pituitary and the hypothalamic level and/or, at least partially, via a GHRH-mediated mechanism. However, the possibility that GHRPs act via an unknown hypothalamic factor (U factor) is still open. GHRP-6 was the first hexapeptide to be extensively studied in humans. More recently, a heptapeptide, GHRP-1, and two other hexapeptides, GHRP-2 and Hexarelin, have been synthesized and are now available for human studies. Moreover, non-peptidyl GHRP mimetics have been developed which act via GHRP receptors and their effects have been clearly demonstrated in animals and in humans in vivo. Among non-peptidyl GHRPs, MK-0677 seems the most interesting molecule. The GH-releasing activity of GHRPs is marked and dose-related after intravenous, subcutaneous, intranasal and even oral administration. The effect of GHRPs is reproducible and undergoes partial desensitization, more during continuous infusion, less during intermittent administration: in fact, prolonged administration of GHRPs increases IGF-1 levels both in animals and in humans. The GH-releasing effect of GHRPs does not depend on sex but undergoes age-related variations. It increases from birth to puberty, persists at a similar level in adulthood and decreases thereafter. By the sixth decade of life, the activity of GHRPs is reduced but it is still marked and higher than that of GHRH. The GH-releasing activity of GHRPs is synergistic with that of GHRH, is not affected by opioid receptor antagonists, such as naloxone, and is only blunted by inhibitory influences, including neurotransmitters, glucose, free fatty acids, gluco corticoids, recombinant human GH and even exogenous somatostatin, which are known to almost abolish the effect of GHRH. GHRPs maintain their GH-releasing effect in somatotrope hypersecretory states such as in acromegaly, anorexia nervosa and hyperthyroidism. On the other hand, their good GH-releasing activity has been shown in some but not in other somatotrope hyposecretory states. In fact, reduced GH responses after GHRP administration have been reported in idiopathic GH deficiency as well as in idiopathic short stature, in obesity and in hypothyroidism, while in patients with pituitary stalk disconnection or Cushing's syndrome the somatotrope responsiveness to GHRPs is almost absent. In short children an increase in height velocity has also been reported during chronic GHRP treatment. Thus, based on their marked GH-releasing effect even after oral administration, GHRPs offer their own clinical usefulness for treatment of some GH hyposecretory states.

Publication Types:
Review

PMID: 9186261 [PubMed - indexed for MEDLINE]

Growth hormone releasing peptide (GHRP-6) stimulates phosphatidylinositol (PI) turnover in human pituitary somatotroph cells.

Lei T, Buchfelder M, Fahlbusch R, Adams EF.

Department of Neurosurgery, University of Erlangen-Nurnberg, Germany.

Growth hormone releasing peptide (GHRP-6) is a synthetic hexapeptide which specifically stimulates secretion of growth hormone (GH) by pituitary somatotrophs. The precise intracellular mechanism by which this is achieved has not been deciphered although it is known to involve protein kinase C (PKC) and Ca2+ but to be cAMP-independent. We have used cell cultures of human pituitary somatotrophinomas to demonstrate powerful effects of GHRP-6 on membrane phosphatidylinositol (PI) turnover, a second messenger system which leads to activation of PKC and mobilisation of intracellular Ca2+ reserves. Incubation of somatotrophinoma cells with GHRP-6 led to a dose-dependent stimulation of rate of PI turnover. GH secretion was increased in parallel. Effects were discernable after only 15 minutes incubation and rose to a maximum at 2 hours. PI turnover was stimulated by GHRP-6 in 8 of 8 tumours examined, effects ranging from 2.1 - 7.9 fold increases. Stimulation of GH secretion by GHRP-6 was independent of presence of gsp oncogenes, emphasising the cAMP-independent nature of its effects. These results provide evidence that the GH-stimulatory effects of GHRP-6 are achieved through activation of the PI second messenger system and thus support earlier findings that PKC and Ca2+ play central roles in mediating the effects of GHRP-6.

PMID: 7772238 [PubMed - indexed for MEDLINE]

[G21]

klopt interessante shizzlle had er al het een en ander over gelezen..pct voor HGH..haha het wordt steeds mooier

[klaas]

lol idaad..klinkt wel goed

[Br0]

Hupla weer een nieuw beestje op de markt Het ziet er erg aantrekkelijk uit voor mij heb nl een groot probleem met eetlust.