john arnold
New member
any feedback on this yet or any logs?
*wink wink*IBE said:maybe we will pick 10 people for the hexatropin to test as well
Thank you bromilwood said:I think syr would be an excellent candidate...
I have PCT coming up for SD/Prostana/Ergomax in two weeks. Would be interested in being a tester for Hexatropin should it become available.IBE said:maybe we will pick 10 people for the hexatropin to test as well
mass_builder said:SJA how long are you going to run it?
IBE said:maybe we will pick 10 people for the hexatropin to test as well
Hehe...I've looked into that badboy for along time now. Also goes by ibutamoren mesylate.Fastflight said:What about this: spiroindoline L-163,191 (MK-0677) little sucker?
Would be a nice addition to your peptide-arsenal?
great info, bro. In your searches can u quantify the HGH increase respect for istance hexarelin?Enigma76 said:Might still want to look into it. A pill a day is easier/more cost effective than an oral syringe a day.
thanks, then without AAS a cortisol suppressor would be indicated.Enigma76 said:Back to hexarelin, just FYI it has been found to significantly increase cortisol production as well as GH secretion.
I'll try and give you an answer I'm sure of this time :hammer:judge-mental said:enigma, Im intersted in GHRH secretagogues, any info on which one of those acts through GHRH?
Enigma76 said:Back to hexarelin, just FYI it has been found to significantly increase cortisol production as well as GH secretion.
I dont think the research is out there on that...I could be wrong, as I didnt look for long, but I only found information relating to the agonists.Mr.50 said:So this should be an issue for Hexatropin but not Ectotropin right?
Enigma76 said:I dont think the research is out there on that...I could be wrong, as I didnt look for long, but I only found information relating to the agonists.
It seems most (if not all) GHS agonists (GHRPs) exert some type of cortisol increase...one study found a 2fold increase in serum cortisol after GHRP administration. Others claimed "not substantial but still significant", with significant referring to the statistical testing.
The only ones I can find that dont increase cortisol are the non-peptide versions, like mk0677. Also, GHRH administration blunts cortisol.
In addition, GHRP-6/hex are shown to increase prolactin as well.
doesnt sit well with what you just said...GHS release GH via actions at the pituitary and (mainly) the hypothalamic level, probably acting on GH releasing hormone (GHRH) secreting neurons and/or as functional somatostatin antagonists
wow it seems i have to get more than one box of do$tinex, sigh.Enigma76 said:In addition, GHRP-6/hex are shown to increase prolactin as well.
I'm confused with what two things I said are contraindicting.judge-mental said:from the first review you linked
doesnt sit well with what you just said...
I have no idea. I'm not passing judgement, just reading available literature and extracting key points that I feel everyone should know.wojo said:um doesnt exercise cause both gh and cortisol to be released? matter of fact worrying about if this causes cortisol release will release cortisol..lol..just making a point in a smartass kinda way
GH-releasing peptide-6 overcomes refractoriness of somatotropes to GHRH after feeding
[font=helvetica,arial][size=+1]CD McMahon, LT Chapin, RP Radcliff, KJ Lookingland, and HA Tucker [/size][/font]
After a meal, somatotropes are temporarily refractory to growth hormone-releasing hormone (GHRH), the principal hormone that stimulates secretion of growth hormone (GH). Refractoriness is particularly evident when free access to feed is restricted to a 2-h period each day. GH-releasing peptide-6 (GHRP-6), a synthetic peptide, also stimulates secretion of GH from somatotropes. Because GHRH and GHRP-6 act via different receptors, we hypothesized that GHRP-6 would increase GHRH-induced secretion of GH after feeding. Initially, we determined that intravenous injection of GHRP-6 at 1, 3 and 10 microg/kg body weight (BW) stimulated secretion of GH in a dose-dependent manner. Next, we determined that GHRP-6- and GHRH-induced secretion of GH was lower 1 h after feeding (22.5 and 20 ng/ml respectively) than 1 h before feeding (53.5 and 64.5 ng/ml respectively; pooleds.e.m.=8.5). However, a combination of GHRP-6 at 3 microg/kg BW and GHRH at 0.2 microg/kg BW synergistically induced an equal and massive release of GH before and after feeding that was fivefold greater than GHRH-induced release of GH after feeding. Furthermore, the combination of GHRP-6 and GHRH synergistically increased release of GH from somatotropes cultured in vitro. However, it was not clear if GHRP-6 acted only on somatotropes or also acted at the hypothalamus. Therefore, we wanted to determine if GHRP-6 stimulated secretion of GHRH or inhibited secretion of somatostatin, or both. GHRP-6 stimulated secretion of GHRH from bovine hypothalamic slices, but did not alter secretion of somatostatin. We conclude that GHRP-6 acts at the hypothalamus to stimulate secretion of GHRH, and at somatotropes to restore and enhance the responsiveness of somatotropes to GHRH.
old but relevant - arginine normalizes somatostatin, worth taking147: Interactions of growth hormone secretagogues and growth hormone-releasing
hormone/somatostatin.
Tannenbaum GS, Bowers CY. Endocrine 2001 Feb;14(1):21-7
The class of novel synthetic compounds termed growth hormone secretagogues
(GHSs) act in the hypothalamus through, as yet, unknown pathways. We performed
physiologic and histochemical studies to further understand how the GHS system
interacts with the well-established somatostatin (SRIF)/growth hormone-releasing
hormone (GHRH) neuroendocrine system for regulating pulsatile GH secretion.
Comparison of the GH-releasing activities of the hexapeptide growth
hormone-releasing peptide-6 (GHRP-6) and GHRH administered intravenously to
conscious adult male rats showed that the pattern of GH responsiveness to GHRP-6
was markedly time-dependent, similar to that observed with GHRH.
Immunoneutralization of endogenous SRIF reversed the blunted GH response to
GHRP-6 at trough times, suggesting that GHRP-6 neither disrupts nor inhibits the
cyclical release of endogenous hypothalamic SRIF. By striking contrast, passive
immunization with anti-GHRH serum virtually obliterated the GH responses to
GHRP-6, irrespective of the time of administration. These findings suggest that
the GHSs do not act by altering SRIF release but, rather, stimulate GH release
via GHRH-dependent pathways. Our dual chromogenic and autoradiographic in situ
hybridization experiments revealed that a subpopulation of GHRH mRNA-containing
neurons in the arcuate (Arc) nucleus and ventromedial nucleus (VMN) of the
hypothalamus expressed the GHS receptor (GHS-R) gene. These results provide
strong anatomic evidence that GHSs may directly stimulate GHRH release into
hypophyseal portal blood, and thereby influence GH secretion, through
interaction with the GHS-R on GHRH- containing neurons. Altogether, these
findings support the notion that an additional neuroendocrine pathway may exist
to regulate pulsatile GH secretion, possibly through the influence of the newly
discovered GHS natural peptide, ghrelin.
not so good the next one ... I would postulate recution GHRH from this...J Endocrinol Invest. 1997 Nov;20(10):597-602.
[size=+1]Reduction of the somatotrope responsiveness to GHRH and Hexarelin but not to arginine plus GHRH in hyperprolactinemic patients.[/size]
Dipartimento di Medicina Interna, Universita di Torino, Italy.
Aim of the present study was to verify the maximal secretory capacity of somatotrope cells in patients with pathological hyperprolactinemia (HPRL) comparing it with that in normal age-matched women (NW). To this goal in 12 HPRL normal weight patients (age 28.6 +/- 2.6 yr, BMI 23.1 +/- 1.1 kg/m2) and 8 NW (27.2 +/- 0.8 yr, 22.8 +/- 0.8 kg/m2) we studied the GH response to GHRH (1 microgram/kg i.v.), GHRH plus arginine (ARG, 0.5 g/kg i.v.), an amino acid probably acting at the hypothalamic level inhibiting somatostatin release, and Hexarelin (HEX, 2 micrograms/kg i.v.), a synthetic hexapeptide belonging to GHRP family, which acts concomitantly at the pituitary and the hypothalamic level. IGF-I levels in HPRL were similar to those in NW (179.2 +/- 16.5 micrograms/l and 218.5 +/- 30.8 micrograms/l). In NW the GH response to GHRH (AUC: 1299.5 +/- 186.9 micrograms 90 min/l) was lower (p < 0.02) than those to GHRH + ARG (5252.7 +/- 846.3 micrograms 90 min/l) and HEX 3216.6 +/- 462.3 micrograms 90 min/l) which, in turn, were similar. In HPRL the GH response to GHRH (894.7 +/- 242.4 micrograms 90 min/l) was lower (p < 0.03) than that to HEX (1586.5 +/- 251.3 micrograms 90 min/l) and both were lower (p < 0.03) than that to GHRH + ARG (4468.8 +/- 941.7 micrograms 90 min/l). In HPRL the GH responses to GHRH and HEX were lower than those that in NW (p < 0.03) while that to GHRH + ARG was similar in both groups. These results demonstrate that the somatotrope responsiveness to GHRH and HEX is clearly reduced in patients with pathological hyperprolactinemia. On the other hand, in this condition the GH response to GHRH + ARG is normal. As arginine likely acts via inhibition of hypothalamic somatostatin release, these findings show that the maximal secretory capacity of somatotrope cells in hyperprolactinemia is preserved and indicate that partial refractoriness of somatotrope cells to GHRH and HEX could be due to somatostatinergic hyperactivity.
PMID: 9438917 [PubMed - indexed for MEDLINE]
Psychoneuroendocrinology. 2004 Aug;29(7):851-60.
[size=+1]Hexarelin decreases slow-wave sleep and stimulates the secretion of GH, ACTH, cortisol and prolactin during sleep in healthy volunteers.[/size]
Max Planck Institute of Psychiatry, D-80804 Munich, Germany.
Ghrelin, the endogenous ligand of the growth hormone (GH) secretagogue (GHS) receptor and some GHSs exert different effects on sleep electroencephalogram (EEG) and sleep-related hormone secretion in humans. Similar to GH-releasing hormone (GHRH) ghrelin promotes slow-wave sleep in humans, whereas GH-releasing peptide-6 (GHRP-6) enhances stage 2 nonrapid-eye movement sleep (NREMS). As GHRP-6, hexarelin is a synthetic GHS. Hexarelin is superior to GHRH and GHRP-6 in stimulating GH release. The influence of hexarelin on sleep-endocrine activity and the immune system is unknown. We investigated simultaneously the sleep EEG and nocturnal profiles of GH, ACTH, cortisol, prolactin, leptin, tumor necrosis factor (TNF)-alpha, and soluble TNF-alpha receptors in seven young normal volunteers after repetitive administration of 4 x 50 microg hexarelin or placebo at 22.00, 23.00, 24.00 and 01.00 h. Following hexarelin, stage 4 sleep during the first half of the night, and EEG delta power during the total night decreased significantly. Significant increases of the concentrations of GH and prolactin during the total night, and of ACTH and of cortisol during the first half of the night were found. Leptin levels, TNF-alpha and soluble TNF receptors remained unchanged. We hypothesize that sleep is impaired after hexarelin since the GHRH/corticotropin-releasing hormone (CRH) ratio is changed in favour of CRH. There are no hints for an interaction of hexarelin and the immune system.
Publication Types:
PMID: 15177700
- Clinical Trial
: Eur J Endocrinol. 2004 Jun;150(6):905-11.
[size=+1]Glucocorticoid-dependent stimulation of adiposity and appetite by a ghrelin mimetic in the rat.[/size]
Department of Physiology, University of Cambridge, Downing Street, Cambridge CB2 3EG, Cambridge, UK.
OBJECTIVE: Chronic administration of GH secretagogues (GHSs) induces a state of positive energy balance in rodents by a GH-independent mechanism. Here we sought to determine to what extent the GHS effects to increase food intake and increase fat accumulation are glucocorticoid-dependent. DESIGN: The effects of twice-daily s.c. injections of GH-releasing peptide-6 (GHRP-6) (250 microg/kg) for 2 weeks on body weight, food intake and fat pad weight were determined in both adrenalectomised (ADX) rats (with or without basal corticosterone replacement) and adrenal-intact rats. RESULTS: All GHS-injected rats had a significantly increased body weight at the end of 2 weeks of treatment compared with saline controls. However, increased fat accumulation was only seen in adrenal-intact rats, with a 15% increase in s.c. inguinal (P<0.05 vs saline controls) and 20% increase in visceral mesenteric (P<0.05) fat pad weights following GHS treatment. The increased body weight observed in ADX rats following GHS treatment was not due to increased fat mass or increased weight of other organs measured. Food intake was increased for up to 7 h following a single injection of GHRP-6 in both the adrenal-intact (P<0.01) and corticosterone-replacement groups (P<0.05). This stimulating effect on food intake was not observed at any time point in the ADX rats without corticosterone replacement. CONCLUSION: These data suggest that GHS-induced body weight gain is glucocorticoid-independent. However, basal levels of glucocorticoids are permissive for the GHS-induced increase in food intake whilst activation of the hypothalamo-pituitary-adrenal axis appears to contribute to the GHS-induced accumulation of fat mass.
PMID: 15191362 [PubMed - indexed for MEDLINE]
[D-Lys3]-GHRP-6's antagonist activity in Ghrelin induced growth-hormone secretion in prepubertal rats
[font=Arial, Helvetica, sans-serif]Invalid Link Removed[/font][font=Arial, Helvetica, sans-serif][/font]Ghrelin is a 28-amino-acid peptide, with an essential n-octanoyl modification at Ser3, that elicits growth-hormone (GH) secretion in rats and humans. At present, the mechanisms of ghrelin action and its interactions with other systems controlling GH secretion remain poorly characterized. In this context, the present study was undertaken to obtain information about ontogeny and possible gender differences in the GH-releasing activity of ghrelin, and to delineate its primary site(s) of action at the hypothalamus and/or pituitary. In addition, the interactions between ghrelin and other relevant signals in the control of GH secretion, such as excitatory amino acids (EAAs), nitric oxide (NO) and serotonin, were assessed. Experiments were carried out in infantile-prepubertal animals, when GH pulsatility is not yet established. Systemic administration of ghrelin (25 nmol/rat, i.p.) to 5-, 10- and 23-day-old male and female rats increased plasma GH levels from day 10 onwards. This action was NO dependent, since it disappeared in 23-day-old males after pretreatment with an inhibitor of NO synthase (NAME). Similarly, central infusion of ghrelin (3 nmol/rat, i.c.v.) elicited GH responses in 10- and 23-day-old animals significantly higher than after systemic administration. By contrast, in vitro challenge of pituitary tissue with increasing doses of ghrelin (10(-9)-10(-7) M) failed to enhance GH release into the incubation medium, whereas stimulation with GH-releasing hormone (GHRH; 10(-7) M) or GHRP-6 (10(-7) M) was effective. Finally, effects of ghrelin were blocked by pretreatment with MK-801 and NBQX antagonists of EAA ionotropic receptors and after manipulation of endogenous serotoninergic tone. In addition, the potent releasing activity of EAA agonists NMDA and AMPA was blunted by pretreatment with D-Lys3-GHRP-6, a selective antagonist of the cognate ghrelin receptor, i.e. the GH-secretagogue receptor. In conclusion, our results demonstrate that GH-releasing activity of ghrelin appears early in the infantile period, is NO dependent and involves a primary hypothalamic site of action. The data also demonstrate for the first time the existence of a cross-talk between ghrelin and other neurotransmitter systems, such as EAAs and serotonin, in precise control of GH secretion.
Pinilla L, et al. Neuroendocrinology 2003 Feb;77(2):83-90
hi - can you link the article in question? thanksIBE said:if you would read the artical we posted where it says increase in muscle mass now where do you think this incease in muscle is coming from?
so where in that article:To gain further insight into the therapeutic potential, we examined whether or not intraperitoneally administered [D-Lys-3]-GHRP-6 produced anorexigenic effects in ob/ob obese mice. [D-Lys-3]-GHRP-6 significantly decreased food intake in ob/ob obese mice as well as in lean mice (fig 3AInvalid Link Removed). Finally, we examined the effects of repeated administration of [D-Lys-3]-GHRP-6 on body weight gain and glycaemic control in ob/ob obese mice. Repeated injections of [D-Lys-3]-GHRP-6 significantly lowered body weight gain and blood glucose concentrations without decreasing muscle weight (fig 3BInvalid Link Removed, table 2Invalid Link Removed). Furthermore, [D-Lys-3]-GHRP-6 treatment significantly reduced FFA levels of ob/ob obese mice by 24% compared with saline treated ob/ob obese mice (fig 3CInvalid Link Removed). Control and [D-Lys-3]-GHRP-6 treated animals exhibited no significant differences in water intake (10.5 (0.43 (200 nmol) v 10.7 (0.43) ml/day (control); n=7).
IBE said:will do bro pm me your shipping info we will send you 2 kits
IBE said:Yes!
IBE said:will do bro pm me your shipping info we will send you 2 kits