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Immunomodulatory effects of a set of amygdalin analogues on human keratinocyte cells
- Publication Year :
- 2005
-
Abstract
- Peptide T (PT) is an octapeptide shown to resolve psoriatic lesions. Our previous investigations suggest that keratinocytes play an important role in conditioning the therapeutic effects of the PT in psoriasis. However, peptides are not good therapeutic agents, because they exhibit poor absorption, are easily metabolized and are immunogenic. Using computational methods, the natural product amygdalin was identified as peptidomimetic of PT. However, amygdalin exhibits a toxic profile due to its cyanide group. To overcome this deleterious effect, we synthesized analogues lacking the cyanide group. Human keratinocytes were treated with PT or with three different peptidomimetics of PT. To study its effects on the expression of HSP-70, TGF-beta, alpha-v integrin, ICAM-1 and cytokines, we analysed the protein levels by Western blot and ELISA. Our results show that the different peptidomimetics of PT tested exhibit a similar biological behaviour in regard to the overexpression of HSP-70, TGF-beta and alpha-v integrin than the native peptide. TNF-alpha is overexpressed by PT and SVT-03018; between the other two analogs, SVT-03016 do not produce any significant change in regard to the control, while SVT-03017 shows only a moderate increase in regard to control. SVT-03018 provokes a remarkable upregulation of IL-10, stronger than SVT-03016, SVT-03017 and PT. All the other three analogues reduce comparably to the PT, the expression of ICAM-1 and do not increase the release of proinflammatory cytokines. The results highlighted that the three analogues of amygdalin with the cyanide group removed exhibit the same biological effects of PT. Therefore, they can be considered peptidomimetics, suggesting their possible use in the treatment of psoriasis.
- Subjects :
- Keratinocytes
Peptidomimetic
Amygdalin
Blotting, Western
Alpha (ethology)
Down-Regulation
Peptide
Enzyme-Linked Immunosorbent Assay
Dermatology
Biology
Biochemistry
Proinflammatory cytokine
Transforming Growth Factor beta1
chemistry.chemical_compound
Transforming Growth Factor beta
medicine
Humans
Immunologic Factors
HSP70 Heat-Shock Proteins
Molecular Biology
Cells, Cultured
chemistry.chemical_classification
Peptide T
Biological activity
Integrin alphaV
Intercellular Adhesion Molecule-1
immunomodulation – keratinocyte
Blot
medicine.anatomical_structure
chemistry
Cytokines
Keratinocyte
peptide T – peptidomimetics – psoriasis
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....46126a3689f05b57120411645ffb74c1