Described herein are sermorelin peptide compositions formulated for high oral bioavailability and high rates of absorption for treatment in a variety of applications, such as treatment of low testosterone, diminished endurance and energy, deficient immune system, slow metabolism, deficient cognitive function, poor sleep health, and poor bone health.

Disclosed herein are compositions of GHRH agonists and peptides, and methods to treat disorders, such as ischemia and reperfusion injury. In one embodiment, a method of treating a reperfusion injury in a subject in need may involve administering a therapeutically effective amount of at least one GHRH agonist peptide to the subject. In additional embodiment, a method of promoting vasculogenesis in a mammal may involve administering a therapeutically effective amount of at least one GHRH agonist peptide to the subject. In a further embodiment, a method of promoting differentiation of mesenchymal stem cells into endothelial cells may involve contacting mesenchymal stem cells with at least one GHRH agonist peptide.

A medicinal composition for suppressing or preventing the metastasis of a malignant tumor, the composition comprising, as an active ingredient, at least one kind of vasoprotective agent selected from the following (i) to (iv): (i) angiotensin II receptor antagonist, (ii) HMG-CoA reductase inhibitor, (iii) ghrelin or its derivative, and (iv) adrenomedullin or its derivative; or a pharmacologically acceptable salt thereof.

A medicinal composition for suppressing or preventing the metastasis of a malignant tumor, the composition comprising, as an active ingredient, at least one kind of vasoprotective agent selected from the following (i) to (iv): (i) angiotensin II receptor antagonist, (ii) HMG-CoA reductase inhibitor, (iii) ghrelin or its derivative, and (iv) adrenomedullin or its derivative; or a pharmacologically acceptable salt thereof.

A medicinal composition for suppressing or preventing the metastasis of a malignant tumor, the composition comprising, as an active ingredient, at least one kind of vasoprotective agent selected from the following (i) to (iv): (i) angiotensin II receptor antagonist, (ii) HMG-CoA reductase inhibitor, (iii) ghrelin or its derivative, and (iv) adrenomedullin or its derivative; or a pharmacologically acceptable salt thereof.

Described herein are bioactive peptides that are modified at one or more positions with a PEG moiety. An example of such a PEGylated bioactive peptide is a GHRH analog that is modified at one or more positions with a PEG moiety. Also described are pharmaceutically acceptable salts thereof and pharmaceutical compositions comprising such analogs or salts thereof, as well as methods, kits and uses thereof, for example for inducing or stimulating growth hormone secretion in a subject and for diagnosing, preventing or treating GH-deficient conditions in a subject.

Described herein are bioactive peptides that are modified at one or more positions with a PEG moiety. An example of such a PEGylated bioactive peptide is a GHRH analog that is modified at one or more positions with a PEG moiety. Also described are pharmaceutically acceptable salts thereof and pharmaceutical compositions comprising such analogs or salts thereof, as well as methods, kits and uses thereof, for example for inducing or stimulating growth hormone secretion in a subject and for diagnosing, preventing or treating GH-deficient conditions in a subject.

The present invention provides novel conformationally-defined macrocyclic compounds that have been demonstrated to be selective modulators of the ghrelin receptor (growth hormone secretagogue receptor, GHS-R1a and subtypes, isoforms and variants thereof). Methods of synthesizing the novel compounds are also described herein. These compounds are useful as agonists of the ghrelin receptor and as medicaments for treatment and prevention of a range of medical conditions including, but not limited to, metabolic and/or endocrine disorders, gastrointestinal disorders, cardiovascular disorders, obesity and obesity-associated disorders, central nervous system disorders, genetic disorders, hyperproliferative disorders and inflammatory disorders.

The present disclosure provides methods for treating one or more of cognitive deficits or cognitive impairments associated with or caused by mild brain injuries, chemotherapy treatment, chemotherapy medication, post-chemotherapy cognitive impairment (PCCI), chemo brain, and other disorders arising from cognitive dysfunction in a subject by administering to the subject an effective amount of a composition comprising ghrelin or a ghrelin variant.

The present disclosure provides methods for treating one or more of cognitive deficits or cognitive impairments associated with or caused by mild brain injuries, chemotherapy treatment, chemotherapy medication, post-chemotherapy cognitive impairment (PCCI), chemo brain, and other disorders arising from cognitive dysfunction in a subject by administering to the subject an effective amount of a composition comprising ghrelin or a ghrelin variant.