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Bombesin-like peptides (BLPs) represent a fascinating family of neurohormone polypeptides with diverse physiological and pathophysiological roles. Initially isolated from amphibian skin, these peptides have since been identified in various vertebrate species, including mammals, where they are known as mammalian homologs of bombesin. The foundational peptide bombesin itself is a 14-amino acid peptide that exhibits biological activity in both the central nervous system and the gastrointestinal tract. This article delves into the intricate world of bombesin-like peptides, exploring their discovery, functions, and implications in health and disease.

The journey of understanding bombesin began with its isolation from the skin of the European fire-bellied toad, *Bombina bombina*, by V. Erspamer and colleagues in 1970. This discovery paved the way for the identification of numerous bombesin-like neuropeptides (BLPs) in other species. In mammals, gastrin-releasing peptide (GRP) and neuromedin B (NMB) are two prominent bombesin-related peptides due to their structural similarities to bombesin. These peptides are characterized by their amino acid sequences and their ability to interact with a family of G protein-coupled receptors (GPCRs), primarily the GRP-preferring receptor (GRPR).

One of the earliest and most extensively studied functions of bombesin-like peptides is their influence on feeding behavior. Research has demonstrated that bombesin-like peptides inhibit food intake when administered either peripherally or centrally, acting through satiety mechanisms. This effect underscores their role in regulating energy metabolism and body weight. Beyond appetite control, bombesin-like peptides are involved in a wide array of other physiological processes. These include regulating smooth muscle contraction, influencing secretions, affecting blood pressure, heart rate, body temperature, and plasma glucose levels.

The involvement of bombesin-like peptides extends to the stress response. Studies have highlighted that the bombesin family of peptides (BBs), initially recognized for regulating food intake, also plays a role in mediating stress responses. This dual role suggests a complex interplay between hormonal signaling, neural pathways, and behavioral outcomes.

Furthermore, bombesin-like peptides have been implicated in growth regulation. Evidence suggests that these peptides can function as autocrine growth factors, meaning a cell produces and secretes a substance that can then bind to specific membrane receptors on the same cell, promoting its growth. This autocrine hypothesis has been supported by studies demonstrating that monoclonal antibodies targeting bombesin can block the binding of these peptides to cellular receptors, thereby inhibiting growth. This autocrine signaling mechanism is particularly relevant in the context of cancer.

Indeed, bombesin-like peptides are known to be over-expressed in several forms of cancer, including lung, prostate, breast, and colon cancers. Their role in promoting tumor growth and progression makes them a significant area of research in oncology. Moreover, bombesin-like peptides are localized in the prostate gland in males, where they contribute to contraction and are secreted in seminal plasma. In the lung, bombesin-like immunoreactivity has been observed in human fetal and neonatal lung tissue, suggesting a role in lung development. In a more concerning context, bombesin-like peptide mediates lung injury in certain animal models, highlighting potential pathological implications.

The study of bombesin-like peptides has also led to the development of specific therapeutic agents. For instance, bombesin receptor antagonists and agonists are being investigated for their potential in treating various conditions. Gastrin-Releasing Peptide, human (GRP), as a prominent member of the bombesin-like peptide family, serves as a target for such therapeutic development. Research into growth hormone stimulating peptide therapy also touches upon the broader endocrinological roles of peptides, with some bombesin-like peptides potentially influencing hormone secretion.

The complexity of bombesin-like peptides is further illustrated by their ability to modulate neural circuits. Recent findings reveal that gastrin-releasing peptide (GRP), a bombesin-like neuropeptide, can recruit disinhibitory cortical microcircuits through selective targeting. This suggests a role in cognitive functions and sensory processing.

In summary, the bombesin-like peptide family is a group of evolutionarily conserved peptides with profound impacts on a multitude of physiological processes. From regulating appetite and stress to influencing growth and mediating disease pathology, these peptides continue to be a rich area of scientific inquiry. The ongoing research into their mechanisms of action and therapeutic potential underscores their significance in both understanding fundamental biology and developing novel clinical strategies. The 14-amino acid neurohormone polypeptide bombesin and its mammalian counterparts are integral to a complex biological network with far-reaching implications.