Yu LIU, Jing-xia ZHAO, Yan WANG, et al. Regulatory Effect of Yangxue Jiedu Decoction on Tight Junction of Keratinocytes in Psoriasis. [J]. Chinese Journal of Experimental Traditional Medical Formulae 26(3):62-70(2020)
DOI:
Yu LIU, Jing-xia ZHAO, Yan WANG, et al. Regulatory Effect of Yangxue Jiedu Decoction on Tight Junction of Keratinocytes in Psoriasis. [J]. Chinese Journal of Experimental Traditional Medical Formulae 26(3):62-70(2020) DOI: 10.13422/j.cnki.syfjx.20200301.
Regulatory Effect of Yangxue Jiedu Decoction on Tight Junction of Keratinocytes in Psoriasis
To observe the expressions of tight junction proteins (claduin-1
claudin-7 occludin)of psoriasis-like lesions in mice
and clarify the effect of Yangxue Jiedu decoction on the epidermal barrier of psoriasis
so as to provide scientific basis for the treatment of psoriasis with Yangxue Jiedu decoction.
Method:
2
C57BL/6J mice were randomly divided into control group
model group
methotrexate group and Yangxue Jiedu decoction.Methotrexate solution and water decoction of Yangxue Jiedu decoction were prepared
and the mice were given imiquimot to induce psoriasis-skin lesions after the hair was shaved.Daily photos were taken to record the forms of skin lesions and psoriasis area and severity index(PASI) scores.Water and oil test pens were used to detect skin moisture content. The pathological changes were observed by htoxylin eosin (HE) staining
and the epidermal thickness was measured.Ki67 was detected by immunofluorescence. Immunohistochemistry was used to detect the expressions of loricrin
CD3
+
T lymphocyte infiltration and claduin-1
claudin-7
occludin.In addition
the expressions of claudin-7 and occludin in skin lesions were detected by Western blot.Meanwhile
interleukin-17(IL-17) (1 mg·L
-1
) was used to simulate the microenvironment of psoriasis skin lesions
and the intervention was conducted by making Yangxue component
Jiedu component and Yangxue Jiedu dry powder.The toxicity of the drug on Hacat cells was detected by cell counting kit-8(CCK-8)method.The effect of the drugs on the expressions of claudin-1
claudin-7
occludin in Hacat was detected by immunofluorescence assay.
Result:
2
Yangxue Jiedu decoction could significantly reduce the psoriasis skin lesions in mice
and reduce the PASI score and skin thickness (
P
<
0.01). Compared with the model group
the skin moisture content in the lesion was increased (
P
<
0.01). Abnormal expressions of ki67 and loricrin in epidermis and infiltration of CD3
+
T cells were reduced (
P
<
0.01). In addition
the expressions of claudin-1
claudin-7
occludin proteins (
P
<
0.05)
and the integrity of the tight junction structure were increased.
In vitro
studies
compared with the model group
the expressions of claudin-1
claudin-7
and occludin in the Yangxue Jiedu group and Yangxue group were increased (
P
<
0.05). Compared with the model group
there was no statistically significant difference in protein expression in the Jiedu group.
Conclusion:
2
By regulating the expressions of tight junction proteins between keratinocytes
Yangxue Jiedu decoction can inhibit the abnormal proliferation and differentiation
and further restore the broken epidermal barrier.Yangxue Jiedu decoction plays a role in regulating tight junction mainly through Yangxue component.
L vander Fits, S Mourits, J S Voerman, et al.Imiquimod-induced psoriasis-like skin inflammation in mice is mediated via the IL-23/IL-17 axis[J].J Immunol, 2009, 182(9): 5836-5845.
A Ishida-Yamamoto, M Kishibe, M Murakami, et al.Lamellar granule secretion starts before the establishment of tight junction barrier for paracellular tracers in mammalian epidermis[J].PLoS One, 2012, 7(2): e31641.
W R Swindell, K A Michaels, A J Sutter, et al.Imiquimod has strain-dependent effects in mice and does not uniquely model human psoriasis[J].Genome Med, 2017, 9(1): 24.
T Yuki, M Tobiishi, A Kusaka-Kikushima, et al.Impaired tight junctions in atopic dermatitis skin and in a skin-equivalent model treated with interleukin-17[J].PLoS One, 2016, 11(9): e161759.