Related Experiment Video
Updated: May 30, 2026

Comparative Analysis of Human Growth Hormone in Serum Using SPRi, Nano-SPRi and ELISA Assays
Published on: January 7, 2016
Antineoplastic action of growth hormone-releasing hormone (GHRH) antagonists
Agnieszka Siejka1, Hanna Lawnicka, Gabriela Melen-Mucha
1Department of Immunoendocrinology, Chair of Endocrinology, Medical University of Lodz, Dr. Sterling 3 Str., 91-425, Lodz, Poland.
Abstract:
Some of the antagonists of growth hormone-releasing hormone (GHRH) are able to inhibit the growth of various experimental human cancers. The antitumor effects of first antagonists seemed to be dependent mainly on the disruption of pituitary secretion of growth hormone (GH), followed by the reduction in the levels of circulating insulin-like growth factor (IGF)-1, an important growth factor for cancer cells. It seems obvious, that growth hormone deficiency (GHD) induced by GHRH antagonists with all its complications, could limit the beneficial effects of GHRH antagonists therapy, and decrease patients' quality of life. The discovery of local autocrine/paracrine production of GHRH and other related growth factors in many tumoral tissues, in combination with the wide expression of GHRH receptors on cancer cells, directed the research to the synthesis of more potent GHRH antagonists. These compounds exert strong inhibitory effects directly on tumor growth, with scarce endocrine action. The receptor-mediated mechanisms comprise complex and still not completely understood effects on intracellular signaling pathways that are strictly related to human tumorigenesis. This review summarizes recent patents and latest observations on the antineoplastic role of GHRH antagonists in human tumors with emphasis on potential therapeutic applications in clinical oncology.
Insights
Growth hormone-releasing hormone (GHRH) antagonists show promise in inhibiting human cancer growth. Newer antagonists target tumors directly, reducing side effects associated with growth hormone deficiency.
Area of Science:
- Oncology
- Endocrinology
- Molecular Biology
Background:
- Growth hormone-releasing hormone (GHRH) antagonists can inhibit experimental human cancers.
- Initial GHRH antagonists primarily worked by reducing growth hormone (GH) and insulin-like growth factor (IGF)-1 levels.
- This indirect mechanism has limitations due to potential growth hormone deficiency complications.
Purpose of the Study:
- To review recent advancements in GHRH antagonists for cancer therapy.
- To highlight novel antagonists with direct antitumor effects.
- To discuss the potential clinical applications of these agents in oncology.
Main Methods:
- Review of recent patents and scientific literature.
- Analysis of GHRH antagonist mechanisms of action.
- Focus on direct tumor-targeting strategies versus endocrine effects.
Main Results:
- GHRH antagonists can inhibit various human cancer types.
- Newer GHRH antagonists exhibit potent direct antitumor activity.
- These agents act via receptor-mediated pathways affecting intracellular signaling in tumors.
- Tumorigenesis-related signaling pathways are implicated.
Conclusions:
- GHRH antagonists represent a promising therapeutic strategy for human cancers.
- Directly targeting GHRH receptors on cancer cells offers a more focused approach.
- Further research into receptor-mediated mechanisms could unlock new clinical applications.
Related Concept Videos
Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers
α1-blockers: These drugs inhibit α1-adrenoceptors on smooth muscle cells, resulting in vasodilation. This vasodilation lowers blood pressure, making α1-blockers valuable in treating hypertension. Additionally, α1-blockers effectively address urinary obstruction...
Glucagon-like Receptor Agonists
GLP-1, when administered in high doses intravenously, triggers insulin secretion, inhibits glucagon release, slows gastric emptying, reduces food intake, and restores normal insulin secretion. However, its rapid inactivation by the...
Drug-Receptor Interaction: Antagonist
Antagonists can be classified as competitive or noncompetitive based on their...
Transducer Mechanism: Enzyme-Linked Receptors
Major types that are helpful drug targets include:
Drugs Acting on Autonomic Ganglia: Blockers
Drug-Receptor Interaction: Agonist
Agonists can bind to receptors in different ways. Some agonists bind directly to the receptor's active site, mimicking the endogenous ligand's action.
