[Recent data on GnRH receptors].

Area of Science:

• Endocrinology
• Molecular Biology
• Oncology

Background:

• GnRH receptors (GnRHR) primarily activate Gq proteins, influencing gonadotropin secretion.
• GnRHR signaling also involves Gs and Gi proteins, impacting GnRH pulsatile release and tumor cell apoptosis.
• GnRHR can directly interact with integrins, generating additional intracellular signals.

Purpose of the Study:

• To elucidate the multifaceted roles of GnRH receptors beyond pituitary secretion.
• To explore the direct involvement of GnRH receptors in tumoral diseases.
• To investigate novel therapeutic applications of GnRH analogs targeting cancer.

Main Methods:

• Analysis of GnRH receptor intracellular signaling pathways (Gq, Gs, Gi).
• Investigation of GnRH receptor interactions with membrane integrins.
• Evaluation of GnRH analog effects on tumor cell growth and apoptosis.

Main Results:

• GnRH receptors are implicated in both pituitary gonadotropin secretion and cancer.
• Specific GnRH receptor conformations, influenced by ligands, can trigger direct anti-tumoral effects.
• The absence of an intracytoplasmic C-terminal tail is critical for the anti-proliferative action of certain GnRH analogs.

Conclusions:

• GnRH receptors present a direct therapeutic target for cancer treatment.
• Targeting GnRH receptors offers a dual approach: indirect anti-steroidogenic action and direct cytotoxic effects.
• This research paves the way for a new classification of GnRH analogs based on their anti-tumoral activity.