Proline-rich polypeptide (PRP)

Proline-rich polypeptide (PRP), commonly known by the trade name Colostrinin, is a complex of low-molecular-weight peptides derived from mammalian colostrum, particularly from sheep and cows (Leszek et al., 1999). These peptides are characterized by a high concentration of proline and function as potent immunomodulators and neuroprotective agents. PRPs work by balancing the immune system, inducing the maturation of T-cells and regulating cytokine production to either stimulate a deficient immune response or suppress an overactive one, such as in allergies or autoimmune conditions (Janusz & Lisowski, 1993). In the context of Alzheimer's disease, PRPs have been shown to inhibit the aggregation of amyloid-beta peptides and facilitate the dissolution of pre-formed fibrils, which are central to the disease's pathology (Bilikiewicz & Gaus, 2004). While they are frequently discussed in pharmacological research, PRPs are generally classified as therapeutic agents or active peptide complexes rather than traditional molecular targets like receptors or enzymes. Clinical studies have indicated that PRPs can help stabilize cognitive function in patients with mild-to-moderate Alzheimer's disease with minimal side effects.

Other names

ColostrininCLNProline-rich proteinsInfo-peptidesPRPs

Proline-rich polypeptides (PRPs) act as immunomodulators by regulating the production of cytokines, including the induction of interferon-gamma (IFN-gamma) and tumor necrosis factor-alpha (TNF-alpha), and the modulation of interleukin-6 (IL-6) (Janusz & Lisowski, 1993). In neurodegenerative contexts, they inhibit the aggregation of amyloid-beta (Aβ) peptides and promote the dissolution of existing Aβ fibrils, thereby reducing neurotoxicity and oxidative stress (Schuster et al., 2005). They also demonstrate the ability to reduce the expression of inflammatory genes and protect cells from reactive oxygen species (ROS).