Thymosin β15 is a small actin-binding protein upregulated in highly metastatic rat prostate cancer cells, relative to low metastatic cells.
CAT No: 10-101-100
Synonyms/Alias:Thymosin β15; Tβ15; Tb15; NB thymosin; NB thymosin beta; thymosin NB; TMSB15A; thymosin-like protein 8; TMSL8; TMSNB; thymosin beta-15A; thymosin beta 15A
Thymosin β15 is a naturally occurring peptide that belongs to the β-thymosin family, a group of actin-sequestering proteins widely studied for their roles in cytoskeletal regulation and cellular motility. As a 43-amino acid peptide, it is structurally and functionally related to other β-thymosins, such as thymosin β4, but exhibits distinct biological activities and tissue distribution. Thymosin β15 is recognized for its involvement in modulating actin dynamics, influencing cell migration, and participating in various physiological and pathological processes. Its biochemical significance has attracted attention in cell biology, molecular signaling research, and studies focused on tissue remodeling and repair mechanisms.
Cell Motility Research: Thymosin β15 is extensively utilized in investigations of cell migration and motility, given its capacity to bind G-actin and regulate actin polymerization. By modulating the availability of actin monomers, it influences cytoskeletal rearrangement, which is fundamental to processes such as wound healing, embryonic development, and metastasis in model systems. Researchers employ this peptide to dissect the molecular mechanisms underlying directed cell movement, enabling a deeper understanding of how actin-binding proteins orchestrate dynamic changes in cellular architecture.
Cytoskeletal Dynamics Studies: In the context of cytoskeletal research, thymosin β15 serves as a valuable tool for elucidating the regulation of actin filament assembly and disassembly. Its actin-sequestering function allows scientists to manipulate intracellular actin pools experimentally, facilitating the study of actin-dependent phenomena such as cell shape modulation, adhesion, and intracellular transport. By incorporating thymosin β15 into in vitro and in vivo assays, researchers can explore the interplay between actin-binding proteins and the broader cytoskeletal network.
Signal Transduction Investigations: The peptide is also employed in studies aimed at deciphering signal transduction pathways that govern cellular responses to external stimuli. Thymosin β15 has been implicated in mediating the effects of various growth factors and extracellular signals, particularly those that trigger cytoskeletal remodeling and cell migration. Through the use of this peptide, scientists can probe the downstream molecular cascades activated during these responses, shedding light on the cross-talk between signaling molecules and the actin cytoskeleton.
Tissue Remodeling and Regeneration Research: Thymosin β15 is relevant in experimental models that examine tissue remodeling, regeneration, and repair. Its role in modulating actin dynamics positions it as a candidate for studies on tissue plasticity, including angiogenesis, extracellular matrix reorganization, and the response of cells to injury. By applying thymosin β15 in controlled laboratory settings, investigators can assess its impact on the cellular activities that underpin tissue regeneration and structural adaptation.
Peptide Biochemistry and Structural Analysis: The unique sequence and functional motifs of thymosin β15 make it a subject of interest in peptide chemistry and protein engineering. Researchers utilize this peptide to study structure-activity relationships, investigate peptide-protein interactions, and develop novel actin-binding analogs. Its biochemical properties are leveraged in assays designed to characterize binding affinities, conformational stability, and the effects of sequence modifications, supporting the rational design of new molecular probes or modulators for cytoskeletal research.
The purpose of this study was to define the inhibitive effects of dietary nickel chloride (NiCl2) on thymocytes in broilers fed on diets supplemented with 0, 300, 600, and 900 mg/kg of NiCl2 for 42 days. We examined the changes of cell cycle phase, percentages of apoptotic cells, T cell subsets, cytokines, and mRNA expression of apoptotic proteins (bcl-2, bax, and caspase-3) in thymocytes by flow cytometry and quantitative real-time polymerase chain reaction (qRT-PCR). In the NiCl2-treated broilers, the percentages of thymocytes in G0/G1 phase were increased, whereas thymocytes in the S phase and the proliferation index were decreased. The percentages of apoptotic thymocytes were increased. Also, the mRNA expression levels of bax and caspase-3 were increased, and mRNA expression levels of bcl-2 were decreased. The percentages of CD3(+), CD3(+)CD4(+), and CD3(+)CD8(+) T lymphocytes in the thymus and peripheral blood were diminished. Concurrently, thymic cytokine (interleukin-1 beta (IL-1β), interleukin-2 (IL-2), interleukin-10 (IL-10), interleukin-12 p35 subunit (IL-12p35), interleukin-12 p40 subunit (IL-12p40), interleukin-21 (IL-21), interferon gamma (IFN-γ), tumor necrosis factor alpha (TNF-α), thymosin β4, thymosin β10, and thymosin β15) mRNA expression levels were decreased. The abovementioned results showed that dietary NiCl2 in excess of 300 mg/kg inhibited thymocyte growth by arresting cell cycle, increasing apoptosis percentage, altering apoptotic protein mRNA expression levels, and downregulating cytokine expression levels.
Tang, K., Guo, H., Deng, J., Cui, H., Peng, X., Fang, J., ... & Yin, S. (2015). Inhibitive effects of nickel chloride (NiCl2) on thymocytes. Biological trace element research, 164(2), 242-252.
Motile cancer cells depend on assembly and disassembly of actin filaments to extend their leading edges as they move, so alterations in the expression or properties of actin binding proteins may influence their invasiveness. Tumor cell movements might be enhanced by overexpression or activating mutations of proteins that stimulate the actin system or lower expression or inactivation of proteins that act as negative regulators of the actin system. Some transformed cells express reduced levels of tropomyosin or α-actinin, proteins that stabilize actin filaments and actin filament bundles, and restoring their expression can reverse some transformed phenotypes. On the other hand, the increased expression of thymosin β15 and gelsolin, proteins implicated in the disassembly of the actin filaments, correlates with poor clinical outcome of cancer patients.
Maul, R. S., Song, Y., Amann, K. J., Gerbin, S. C., Pollard, T. D., & Chang, D. D. (2003). EPLIN regulates actin dynamics by cross-linking and stabilizing filaments. J Cell Biol, 160(3), 399-407.
3. Cationic cell-penetrating peptides are potent furin inhibitors
5. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
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