Date published: 2026-4-1

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DAF-4 Inhibitors

Chemical inhibitors of DAF-4, a protein involved in TGF-β signaling, act primarily by disrupting the kinase activities of various TGF-β type I receptors, such as ALK5, which is a critical component of the signaling pathway utilized by DAF-4. SB-431542, for instance, targets ALK5 to prevent the phosphorylation of Smad2/3, inhibiting the signal transduction normally facilitated by DAF-4. LY364947 and SD-208 function similarly by selectively inhibiting ALK5 kinase activity, blocking the Smad-dependent signaling pathway crucial for DAF-4 function. EW-7197 also impedes ALK5 kinase activity, preventing the activation of Smad2/3 proteins in the TGF-β signaling pathway, thereby inhibiting DAF-4. Moreover, LY2157299 targets ALK5 and disrupts its role in TGF-β signaling, which is essential for the phosphorylation of Smad2/3 and, consequently, the inhibition of DAF-4 signaling. Other chemical inhibitors like A-83-01, SB-505124, and RepSox demonstrate their effect by selectively targeting not only ALK5 but also ALK4 and ALK7, broadening the scope of inhibition across TGF-β type I receptors involved in DAF-4 signaling. A-83-01 and SB-505124 impede the phosphorylation of Smad proteins, a key step in DAF-4 activity. Similarly, RepSox inhibits ALK5, suppressing the TGF-β/Smad signaling pathway crucial for DAF-4. GW788388 is a potent inhibitor of both ALK5 and ALK4, preventing the activation of the Smad2/3 pathway and thereby inhibiting DAF-4 signaling. IN-1130 is an ALK5 inhibitor that disrupts TGF-β-mediated phosphorylation of Smad proteins, which are downstream of DAF-4, effectively inhibiting its activity. Lastly, SM16 and LDN-193189 restrict the Smad signaling pathway pivotal for DAF-4 function by inhibiting ALK5 and ALK2/ALK3, respectively, thus preventing the biological activity of DAF-4. These inhibitors collectively contribute to the modulation of DAF-4 activity by targeting various points within the TGF-β/Smad signaling cascade.

Items 1 to 10 of 11 total

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Product NameCAS #Catalog #QUANTITYPriceCitationsRATING

SB 431542

301836-41-9sc-204265
sc-204265A
sc-204265B
1 mg
10 mg
25 mg
$82.00
$216.00
$416.00
48
(1)

This small molecule inhibits TGF-β type I receptor ALK5, which is involved in the Smad2/3 pathway. Since DAF-4 is a TGF-β receptor, inhibition of ALK5 by SB-431542 prevents phosphorylation of Smad2/3, leading to reduced signal transduction and inhibition of DAF-4-related TGF-β signaling.

LY 364947

396129-53-6sc-203122
sc-203122A
5 mg
10 mg
$107.00
$156.00
4
(1)

LY364947 is a selective inhibitor of the TGF-β type I receptor ALK5. By inhibiting ALK5 kinase activity, LY364947 suppresses the phosphorylation of Smad proteins, which are downstream of DAF-4, thus inhibiting the TGF-β/Smad signaling pathway and subsequently DAF-4 signaling.

A 83-01

909910-43-6sc-203791
sc-203791A
10 mg
50 mg
$202.00
$811.00
16
(1)

A-83-01 selectively inhibits ALK5, ALK4, and ALK7, which are TGF-β type I receptors. DAF-4 signaling relies on similar pathways, and thus A-83-01 inhibits DAF-4 by hindering the phosphorylation of Smad proteins and the propagation of the TGF-β signaling pathway.

TGF-β RI Kinase Inhibitor V

627536-09-8sc-203294
2 mg
$88.00
3
(1)

SD-208 is a TGF-β receptor I (ALK5) kinase inhibitor. By blocking the kinase activity of ALK5, SD-208 disrupts the Smad-dependent signaling pathway, which is necessary for DAF-4 function, thus effectively inhibiting DAF-4 activity.

EW-7197

1352608-82-2sc-507465
5 mg
$345.00
(0)

EW-7197 is a potent inhibitor of ALK5 kinase activity. It prevents the phosphorylation and activation of Smad2/3 proteins in the downstream TGF-β signaling pathway, which are essential for DAF-4 signal transduction, leading to DAF-4 inhibition.

LY2157299

700874-72-2sc-391123
sc-391123A
5 mg
10 mg
$213.00
$359.00
3
(1)

LY2157299, also known as Galunisertib, selectively inhibits ALK5, thereby blocking TGF-β signaling. This results in decreased Smad2/3 phosphorylation and inhibits DAF-4 signaling processes that depend on this pathway.

ALK5 Inhibitor II

446859-33-2sc-221234
sc-221234A
sc-221234B
sc-221234C
sc-221234D
sc-221234E
sc-221234F
1 mg
5 mg
10 mg
50 mg
100 mg
500 mg
1 g
$77.00
$153.00
$219.00
$663.00
$1248.00
$4382.00
$7850.00
8
(1)

RepSox is an ALK5 inhibitor that impedes the TGF-β/Smad signaling pathway. By doing so, it leads to the inhibition of the phosphorylation of Smad2/3, which are downstream of DAF-4, thus inhibiting DAF-4 activity.

GW788388

452342-67-5sc-363544
sc-363544A
5 mg
25 mg
$95.00
$384.00
(0)

GW788388 is a potent and selective inhibitor of both ALK5 and ALK4, which are involved in TGF-β signaling. Inhibition of these receptors' kinase activity prevents activation of the Smad2/3 pathway, thereby inhibiting DAF-4 signaling.

IN-1130

868612-83-3sc-507462
25 mg
$435.00
(0)

IN-1130 is an ALK5 inhibitor that disrupts TGF-β-mediated phosphorylation of Smad proteins. Since Smad proteins are downstream of DAF-4, inhibiting their activation with IN-1130 effectively inhibits DAF-4 activity.

SB-505124

694433-59-5sc-362794
sc-362794A
10 mg
50 mg
$327.00
$1377.00
2
(0)

SB-505124 selectively inhibits ALK4, ALK5, and ALK7, thereby impeding the phosphorylation and activation of Smad2/3 proteins that are crucial for TGF-β signaling. This inhibition affects the signal transduction of DAF-4, leading to its inhibition.