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Innovative Medicines & Omics Smp43 peptide

downstream signaling. This inhibition affects the protein inhibitors of activated STAT proteins, which
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phosphorylation of various substrates involved in cell block STAT activity by preventing their DNA binding and
survival, growth, and metabolism. Smp43 can inhibit facilitating their degradation. By disrupting the JAK/STAT
mTORC1 activity, which is downstream of AKT, resulting pathway, Smp43 can reduce cancer cell proliferation and
in reduced phosphorylation of mTORC1 targets such as induce apoptosis. This pathway is frequently overactive
S6K1 and 4E-BP1, thereby impacting protein synthesis in various cancers, leading to uncontrolled cell growth
and cell growth. The inhibition of mTORC1 by Smp43 and survival. In particular, inhibition of STAT3 by Smp43
can induce autophagy, a vital process for maintaining could decrease cancer cell metastasis and invasion, as
cellular homeostasis and managing stress. By interfering STAT3 is known to promote these processes. The JAK/
with the PI3K/AKT/mTOR pathway, Smp43 may reduce STAT pathway is also critical for immune responses,
cancer cell proliferation and tumor growth, as this pathway including the activation and differentiation of immune
is frequently hyperactivated in cancers. Inhibition of cells. Smp43 can influence these processes, potentially
the pathway could promote apoptosis in cancer cells, benefiting autoimmune and inflammatory diseases. By
presenting a potential strategy for cancer treatment. The inhibiting the JAK/STAT pathway, Smp43 may modulate
PI3K/AKT/mTOR pathway is also crucial for regulating cytokine production and signaling, which are key to
glucose metabolism and insulin signaling, so Smp43’s inflammation and immune responses. The peptide could
modulation of this pathway could have implications for reduce the levels of pro-inflammatory cytokines, such as
metabolic disorders such as diabetes. By inhibiting the IL-6 and TNF-α, offering potential benefits for chronic
pathway, Smp43 might enhance insulin sensitivity and inflammatory conditions such as rheumatoid arthritis and
glucose uptake, offering potential benefits for diabetes inflammatory bowel disease. In addition, Smp43 might
management. Smp43’s effects on the PI3K/AKT/mTOR enhance the signaling of anti-inflammatory cytokines,
pathway may also protect neuronal cells and support their such as IL-10, aiding in the resolution of inflammation and
function. The peptide could help counter neurodegenerative promoting tissue repair. 14,22
processes by reducing oxidative stress and promoting
autophagy. By inhibiting mTOR, Smp43 may enhance 2.5.3. NF-κB pathway
autophagy and facilitate the removal of protein aggregates The NF-κB pathway is a pivotal signaling mechanism
commonly associated with neurodegenerative diseases, that governs immune responses, inflammation, cell
such as Alzheimer’s and Parkinson’s. 8,20 proliferation, and survival. Smp43 may interact directly
with the IκB kinase complex, inhibiting its kinase
2.5.2. JAK/STAT pathway activity. This inhibition prevents the phosphorylation and
The JAK/STAT signaling pathway is crucial for various subsequent degradation of IκB proteins, which normally
biological functions, including cell growth, differentiation, inhibit NF-κB. By blocking IκB kinase activity, Smp43
apoptosis, and immune responses. Dysregulation of this stabilizes IκB proteins, thereby keeping NF-κB sequestered
pathway is associated with a range of diseases, such as in the cytoplasm in an inactive form. Furthermore, Smp43
immune disorders, cancers, and inflammatory conditions. can inhibit the translocation of NF-κB subunits, such as
Smp43 may interact directly with Janus kinases (JAKs), p65 and p50, into the nucleus, preventing these subunits
inhibiting their kinase activity. This inhibition prevents the from binding to DNA and activating the transcription
phosphorylation and activation of signal transducer and of target genes. The peptide may also disrupt the nuclear
activator of transcription (STAT) proteins. By inhibiting localization signals of NF-κB subunits, further hindering
JAK activity, Smp43 reduces the phosphorylation of their entry into the nucleus. As a result, Smp43 reduces
both JAKs and their downstream targets, including the expression of NF-κB target genes, including pro-
various STAT proteins. Specifically, Smp43 can block the inflammatory cytokines, such as TNF-α, IL-1β, and IL-6,
phosphorylation of STAT proteins (such as STAT1, STAT3, which are key players in inflammation. In addition, by
and STAT5), which is essential for their dimerization and modulating NF-κB activity, Smp43 can lower the levels
nuclear translocation, as shown in Figure 3. 21 of anti-apoptotic proteins such as BCL-2 and BCl-XL,
This inhibition of STAT phosphorylation and activation thereby promoting apoptosis in cancer cells. 11,23
results in decreased transcription of STAT-regulated genes Through its inhibition of the NF-κB pathway, Smp43
involved in cell survival, proliferation, and inflammation. has the potential to decrease cancer cell proliferation and
Smp43 might also induce the expression of suppressor induce apoptosis. NF-κB is frequently overactive in various
of cytokine signaling proteins, which negatively regulate cancers, contributing to uncontrolled tumor growth
the JAK/STAT pathway by inhibiting JAK activity and and survival. Smp43’s effect on NF-κB could reduce the
promoting its degradation. In addition, Smp43 may affect expression of metastasis-related genes, such as matrix

Volume 1 Issue 1 (2024) 77 doi: 10.36922/imo.4353