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Signaling Pathway



Thalidomide Chemical Structure

Thalidomide can directly inhibit angiogenesis induced by bFGF or VEGF in vivo.

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Thalidomide Data Sheet
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Biological Activity of Thalidomide

Thalidomide was commonly used therapeutically in the late 1950's; however, it was withdrawn from the market when it was discovered to cause birth defects. More recent research has found Thalidomide to affect key biochemical pathways yielding antiangiogenic and immunomodulatory activities. This compound has been shown to: selectively inhibit tumor necrosis factor-alpha (TNF alpha) biosynthesis and basic fibroblast growth factor (bFGF)-induced angiogenesis, induce apoptosis in human monocytes via a cytochrome c-dependent pathway, and to inhibit HIV-1 replication in a monocytoid (U1) line. These new found uses make Thalidomide an extremely valuable research tool.

Clinical Information of Thalidomide


1 . Makonkawkeyoon S, Limson-Pobre RN, Moreira AL et al. Thalidomide inhibits the replication of human immunodeficiency virus type 1. Proc Natl Acad Sci U S A. 1993 Jul 1;90(13):5974-8.
Thalidomide, a selective inhibitor of tumor necrosis factor alpha (TNF-alpha) synthesis, suppresses the activation of latent human immunodeficiency virus type 1 (HIV-1) in a monocytoid (U1) line. The inhibition is dose dependent and occurs after exposure of the cells to recombinant TNF-alpha, phorbol myristate acetate, lipopolysaccharide, and other cytokine combinations. Associated with HIV-1 inhibition is a reduction in agonist-induced TNF-alpha protein and mRNA production. Thalidomide inhibition of virus replication in the phorbol myristate acetate- and recombinant TNF-alpha-stimulated T-cell line ACH-2 is not observed. The presence of thalidomide also inhibits the activation of virus in the peripheral blood mononuclear cells of 16 out of 17 patients with advanced HIV-1 infection and AIDS. These results suggest the use of thalidomide in a clinical setting to inhibit both virus replication and the TNF-alpha-induced systemic toxicity of HIV-1 and opportunistic infections.
2 . Boireau A, Bordier F, Dubédat P, et al. Thalidomide reduces MPTP-induced decrease in striatal dopamine levels in mice. Neurosci Lett. 1997 Oct 3;234(2-3):123-6.
The effects of thalidomide, a sedative, anti-inflammatory and immunosuppressive agent were studied in the MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) murine model of Parkinson's disease. The striatal levels of dopamine (DA) and of its main metabolites, 3,4-dihydroxyphenylacetic acid (DOPAC) and homovanillic acid (HVA) were measured both in the MPTP control group (3 x 15 mg/kg intraperitoneally) and in the thalidomide groups (repeated treatments at 25 mg/kg or 50 mg/kg postoperatively). For mice treated with thalidomide, a dose-dependent protection was observed against the MPTP-induced decrease in DA. The decrease in HVA levels was totally antagonized by thalidomide at both doses. That thalidomide has activity in this model suggests that an inflammatory process may be involved in the induction of lesions by MPTP in DAergic neurons.
3 . Gockel HR, Lügering A, Heidemann J et al. Thalidomide induces apoptosis in human monocytes by using a cytochrome c-dependent pathway. J Immunol. 2004 Apr 15;172(8):5103-9.
Thalidomide has been shown to be an effective treatment in various immunologic diseases such as Crohn's disease and rheumatoid arthritis. Its major effect is thought to be mediated by the inhibition of TNF-alpha, but the exact mechanism of action is still uncertain. Recent observations could demonstrate that the induction of monocyte apoptosis is a common feature of a variety of anti-inflammatory agents. Therefore, we investigated the role of thalidomide on monocyte apoptosis. Treatment with thalidomide resulted in apoptosis of human peripheral blood monocytes in a time- and dose-dependent manner as demonstrated by annexin V staining. Monocyte apoptosis required the activation of caspases, as combined stimulation by thalidomide together with the broad caspase inhibitor benzyloxycarbonyl-Val-Ala-Asp-fluoromethyl ketone markedly prevented monocyte cell death. Apoptosis was triggered by a CD95/CD95 ligand, TNF-RI, and TRAIL-R1 independent pathway with an inhibition of AKT-1 kinase and consecutive mitochondrial release of cytochrome c, followed by the proteolytic activation of initiator caspase-9 and effector caspase-3. Our data suggest that thalidomide-induced monocyte apoptosis is at least partially mediated by a mitochondrial signaling pathway and might contribute to the complex immunomodulatory properties of the drug.
4 . Zhang S, Li M, Gu Y et al. Thalidomide influences growth and vasculogenic mimicry channel formation in melanoma. J Exp Clin Cancer Res. 2008 Nov 4;27:60. doi: 10.1186/1756-9966-27-60.
AIMS: To observe the effects of thalidomide on melanoma tumor growth and blood supply patterns in C57 mice. METHODS: Thirty mice inoculated subcutaneously with B16F10 cells were randomly divided into the treatment group and the control group. Thalidomide was administered once a day at a dose of 200 mg/kg for the treatment group starting on the fifth day after inoculation, and an equivalent volume of 0.5% carboxylmethyl cellulose was administered similarly in the control group. The diameter of the tumors was measured daily after inoculation until the mice were sacrificed on the 19th day. The different blood supply patterns were counted after immunohistochemical and PAS histochemical double-Staining. VEGF, NF-kappaB, PCNA, MMP-2 and MMP-9 expression in tumor tissue was also assessed. RESULTS: The tumor volume(P = 0.019) and the number of vasculogenic mimicry(P = 0.03) and mosaic vessels(P = 0.004) in the treatment group were significantly decreased compared with the control group. VEGF(P = 0.004), NF-kappaB(P = 0.009), PCNA(P = 0.002), MMP-2 (P = 0.000), MMP-9(P = 0.002) protein expression and MMP-2(P = 0.000) and MMP-9(P = 0.000) mRNA in the treatment group were significantly lower than those in the control groups. CONCLUSION: Thalidomide inhibits vasculogenic mimicry channel and mosaic vessels formation in melanoma through the regulation of vasculogenic factors, and it can induce necrosis of melanoma cells, which may be related with the NF-kappaB signaling pathway.
5 . Prommer EE. Palliative oncology: thalidomide. Am J Hosp Palliat Care. 2010 May;27(3):198-204. doi: 10.1177/1049909109348981.
After decades of disuse because of its teratogenic effects, thalidomide has had a resurgence of use as a promising therapeutic agent for multiple myeloma. Its mechanism of action involves activation of the immune system, antiangiogenic effects, and inhibition of cytokines. Thalidomide does not interact with the cytochrome oxidase system. It is not significantly metabolized, but it does undergo nonenzymatic hydrolysis in plasma. The resulting products are inactive. Despite the potential adverse effects of peripheral neuropathy, constipation, deep vein thrombosis, somnolence, rash, and orthostatic hypotension, thalidomide is an effective first-line agent for multiple myeloma in combination with dexamethasone or melphalan and prednisone. It has also been studied in the palliative care of patients with cytokine-based syndromes such as anorexia-cachexia syndrome. This review describes its use in oncology, hematology, and palliative care.

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