PACAP-38

The main applications in the nervous system are focused on neuroprotection and neural repair. It can exert a protective effect in various neurodegenerative disease models by activating the intracellular cAMP/PKA signaling pathway, inhibiting neuronal apoptosis, and promoting cell survival.
In Alzheimer's disease related research, it has been used to reduce neurotoxicity induced by β - amyloid protein. Research has shown that this peptide can reduce oxidative stress levels and enhance neuronal resistance to damage, thereby improving cognitive dysfunction (Reglodi et al., 2011).

In addition, in Parkinson's disease models, by protecting dopaminergic neurons, reducing neuroinflammatory responses, and improving motor dysfunction.

In models of cerebral ischemia and brain injury, it also demonstrates significant utility. It is widely used in neuroprotective mechanism research by reducing ischemia-reperfusion injury, inhibiting inflammatory cell infiltration, and reducing cell apoptosis rate. These characteristics make it an important candidate molecule for stroke intervention strategy research (Shioda et al., 2016).

Its role in neurovascular regulation makes it one of the key molecules in migraine research. In migraine research, it is widely used to induce experimental migraine models. Clinical studies have shown that exogenous PACAP-38 can induce migraine like headache attacks, which has been used to study the pathogenesis of the disease and novel therapeutic targets (Schytz et al., 2009).
In addition,it has important applications in the study of cerebral blood flow regulation by dilating cerebral blood vessels, regulating neuroinflammation, and affecting the function of the trigeminal nervous system. Its mechanism of action involves vascular smooth muscle relaxation and regulation of neurotransmitter release, therefore it is widely used in research related to cerebrovascular diseases.

The endocrine system plays an important regulatory role, especially in pancreatic function and energy metabolism. Research has shown that it can promote the secretion of insulin by pancreatic beta cells, thereby participating in the process of blood glucose regulation. Therefore, it has been used to explore the mechanism of islet function protection and insulin secretion regulation in the research related to type 2 diabetes (Yada et al., 2000).

In addition, it also participates in lipid metabolism and energy balance regulation. It affects appetite and energy expenditure through the central nervous system and has been used in obesity and metabolic syndrome research to decipher the neural metabolic regulatory network.
In hypothalamic regulation research, it is used to analyze the role of neuropeptides in hormone secretion regulation, such as their effects on adrenocorticotropic hormone release and stress response. These uses further expand its application scope in endocrine research.

The main applications in the immune system are in anti-inflammatory and immune regulation. It can inhibit the release of pro-inflammatory cytokines such as TNF - α and IL-6, while promoting the expression of anti-inflammatory factors, thereby playing a regulatory role in the inflammatory response.
In the inflammatory bowel disease model, it is used to alleviate intestinal inflammatory damage.

Research has found that it helps maintain intestinal barrier function by regulating immune cell activity and inhibiting inflammatory signaling pathways (Delgado et al., 2004).
In addition, it has been used in the study of autoimmune diseases to regulate T cell responses and suppress immune overactivation. These applications make it an important candidate molecule for immune regulation research.

The main applications in the cardiovascular system are focused on vasodilation and myocardial protection. It promotes vascular smooth muscle relaxation and reduces vascular resistance by activating receptor-mediated signaling pathways.
In hypertension research, it is used to explore vascular regulation mechanisms and antihypertensive strategies. Its vasodilatory effect makes it a potential target for cardiovascular therapy (Reglodi et al., 2012).
In addition, in the myocardial ischemia-reperfusion injury model, PACAP-38 exhibits anti apoptotic and antioxidant effects, which can reduce myocardial cell damage. This use makes it of significant value in cardiac protection research.

The main applications in the reproductive system are reflected in hormone regulation and cell development. It participates in regulating the secretion of gonadotropins in the hypothalamus and pituitary gland, and is therefore used to study the mechanism of reproductive endocrine regulation.
In ovarian function research,it is used to analyze follicular development and hormone secretion regulation.

Research has shown that this peptide can promote the survival of granulosa cells and regulate steroidogenesis, thereby affecting ovarian function (Gras et al., 1999).
In addition, it has been used in embryonic development research to explore the signaling regulatory mechanisms involved in cell proliferation, differentiation, and organ formation processes. These applications demonstrate its significant research value in developmental biology.

The main applications in tumor research are reflected in the regulation of cell proliferation and apoptosis. Its function is bidirectional and may manifest as promoting or inhibiting tumor growth in different types of tumors.
In some neuroendocrine tumor studies, it is used to promote cell differentiation and inhibit tumor malignant progression. In other types of tumors, it affects tumor cell proliferation by regulating cell signaling pathways (Vaudry et al., 2009).
In addition, it has also been used to study the neural immune regulatory mechanisms in the tumor microenvironment, providing new research directions for tumor treatment strategies.

As a functional neuropeptide, it is widely used as a tool molecule in basic research. Its applications include receptor function validation, signal pathway analysis, and new drug screening.
In the process of drug development, it is often used to evaluate the activity of novel receptor agonists or antagonists. In addition, by constructing PACAP related models, researchers can conduct in-depth analysis of its mechanisms of action in different systems.
This instrumental use makes it important in neuroscience, endocrinology, and pharmacology research.