**Background**
Fibrinogen is a soluble plasma glycoprotein that plays a critical role in hemostasis and the inflammatory response. During the coagulation cascade, thrombin cleaves fibrinogen to form fibrin, a process that involves the release of small peptides known as fibrinopeptides. These peptides are not merely byproducts of clot formation but serve as potent signaling molecules that modulate the recruitment and activation of various immune cells. Understanding the role of these derivatives is essential for researching inflammatory responses and tissue repair mechanisms. In this context, we will introduce a potent chemotactic agent – Fibrinopeptide B, human.
**Definition**
Fibrinopeptide B, human is a 14-amino acid peptide released from the amino-terminus of the $\beta$-chains of fibrinogen by the action of thrombin. According to the Fibrinopeptide B, human description, its sequence is {Glp}-Gly-Val-Asn-Asp-Asn-Glu-Glu-Gly-Phe-Phe-Ser-Ala-Arg.
**In Vitro Studies**
The Fibrinopeptide B, human In Vitro activity is characterized by its ability to induce directed cell migration. Specifically, Fibrinopeptide B, human (10 nM) causes the directed migration of neutrophils (PMN) and fibroblasts. When evaluating its Fibrinopeptide B, human biological activity, studies have shown that it possesses potent chemotactic activity relative to other known chemoattractants, including human complement (C5a), leukotriene B4 (LTB4), and formyl-methionylleucyl-phenylalanine (fMLP). For fibroblasts, its chemotactic potency is comparable to that of platelet-derived growth factor. However, it is important to note that Fibrinopeptide B, human is not chemotactic for monocytes and does not interact with the PMN receptors typically used by C5a, LTB4, or fMLP. Based on the Fibrinopeptide B, human technical information, the peptide has a molecular weight of 1666.58 and a formula of $\text{C}_{68}\text{H}_{94}\text{F}_3\text{N}_{19}\text{O}_{27}$. In conclusion, Fibrinopeptide B, human is a highly selective chemotactic peptide that promotes the migration of neutrophils and fibroblasts.
Keywords
Fibrinopeptide B, human, FPB,human, Others, inflammatory, epitope, equilibration, fibrin, physiologic, thrombin, Inhibitor, inhibitor, inhibit
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