PDZK1 Upregulation in Estrogen-Related Hyperpigmentation in Melasma

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PDZK1 Upregulation in Estrogen-Related Hyperpigmentation in Melasma Nan-Hyung Kim, Kyung Ah Cheong, Tae Ryong Lee, Ai-Young Lee  Journal of Investigative Dermatology  Volume 132, Issue 11, Pages 2622-2631 (November 2012) DOI: 10.1038/jid.2012.175 Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Increased PDZK1 expression in hyperpigmented skin of melasma patients increases tyrosinase expression. (a) Real-time PCR results for relative ratios of PDZ domain protein kidney 1 (PDZK1) mRNA expression in hyperpigmented (L) compared with normally pigmented (N) skin biopsied from 15 patients. (b) Immunohistochemical staining with anti-PDZK1 and anti-c-Kit antibodies. Nuclei were counterstained with Hoechst 33258 (bar=0.1mm). (c) Reverse transcription–PCR analysis of PDZK1 expression in cultured normal human melanocytes (MC) and keratinocytes (KC). Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) was used as an internal standard. (d, e) Western blot analysis of PDZK1, tyrosinase, extracellular signal–regulated kinase (ERK), CRE-binding protein (CREB), protein kinase C (PKC), and microphthalmia-associated transcription factor (MITF) expression in monocultures of keratinocytes or melanocytes and in mixed cell cultures (KC+MC) 24hours after the transfection with either PDZK1 (PDZK1) or control vector (C). Data in the graphs represent means±SD of five independent experiments (*P<0.05). Journal of Investigative Dermatology 2012 132, 2622-2631DOI: (10.1038/jid.2012.175) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 PDZK1 affects estrogen-induced tyrosinase expression. (a, b) Western blotting of PDZ domain protein kidney 1 (PDZK1) or tyrosinase expression after treatment of indicated concentrations of estrogen only or with PDZK1 overexpression or knockdown. (c, d) Western blotting of estrogen receptor (ER)-α and ER-β in total cell lysates, prepared 24hours after PDZK1overexpression, or estrogen with or without PDZK1 knockdown. Data in the graphs (b–d) represent means±SD of five independent experiments (*P<0.05 vs. untreated control, #P<0.05 vs. samples treated with the corresponding concentration of estrogen). (e) Real-time PCR of ER-α and ER-β in the hyperpigmented compared with normally pigmented skin from 14 of the 15 patients. ERK, extracellular signal–regulated kinase; KC, keratinocytes; MC, melanocytes; MITF, microphthalmia-associated transcription factor; siRNA, small interfering RNA. Journal of Investigative Dermatology 2012 132, 2622-2631DOI: (10.1038/jid.2012.175) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 PDZK1 over-expression upregulates NHE, CFTR, and SLC26A3. (a) Western blot analysis of NHE1, NHE3, CFTR, and SLC26A3 expression in melanocytes and cocultures (KC+MC) 24hours after transfection of PDZ domain protein kidney 1 (PDZK1). Data in the graphs represent means±SD of five independent experiments (*P<0.05). (b) Immunoprecipitation (IP) of total cell lysates of melanocytes and keratinocytes using an anti-PDZK1 antibody with or without PDZK1overexpression, followed by reactivity with antibodies as noted. (c) Immunohistochemical staining of cells with or without PDZK1overexpression using anti-PDZK1 and anti-CFTR antibodies. Nuclei were counterstained with Hoechst 33258 (bar=0.1mm). CFTR, cystic fibrosis transmembrane conductance regulator; ERK, extracellular signal–regulated kinase; KC, keratinocytes; MC, melanocytes; MITF, microphthalmia-associated transcription factor; NHE1, sodium–hydrogen exchanger 1. Journal of Investigative Dermatology 2012 132, 2622-2631DOI: (10.1038/jid.2012.175) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 NHE3, CFTR, and SLC26A3 involvement in estrogen-induced tyrosinase expression. (a) Western blotting of NHE3, CFTR, and SLC26A3 expression after indicated concentrations of estrogen (ES) treatment. (b, c) Western blotting of tyrosinase and NHE3 or CFTR expression after treatment of 100nM estrogen with or without a specific inhibitor of NHE3 (5-ethylisopropyl amiloride, EIPA), or CFTR (172Inh) with or without PDZ domain protein kidney 1 (PDZK1) overexpression (*P<0.05 vs. untreated control, #P<0.05 vs. samples treated with the corresponding concentration of estrogen). (d) Western blotting after indicated concentrations of specific agonists of ER-α (propyl pyrazoletriol, PPT) or ER-β (diarylpropionitrile, DPN) (*P<0.05). Data in the graphs (b–d) represent means±SD of five independent experiments. (e) Real-time PCR analysis of the association of ER-α with NHE3 mRNA expression and of ER-β with CFTR expression in 12 melasma skin samples with PDZK1 upregulation. (Line indicates expression level of each molecule in normal skin.) CFTR, cystic fibrosis transmembrane conductance regulator; ER, estrogen receptor; ERK, extracellular signal–regulated kinase; KC, keratinocytes; MC, melanocytes; NHE3, sodium–hydrogen exchanger 3. Journal of Investigative Dermatology 2012 132, 2622-2631DOI: (10.1038/jid.2012.175) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 PDZK1 and ion transporter are involved in estrogen-induced melanosome transfer with ezrin/radixin/moesin (ERM) and Rac1 phosphorylation. (a) FACS analysis using anti-TYRP-1 and anti-K14 antibodies in cocultures. Both melanocytes and keratinocytes, which were transfected with or without PDZ domain protein kidney 1 (PDZK1), were treated with inhibitor of both estrogen receptor (ER)-α and ER-β (ICI), inhibitor of ER-β (PHTPP), or a specific inhibitor of NHE3 (5-ethylisopropyl amiloride, EIPA) or CFTR (172Inh) (*P<0.05 vs. untreated control, #P<0.05 vs. samples with overexpression of PDZK1). (b) Western blot assays of ERM and Rac1 phosphorylation and PAR-2 expression in the cocultures with or without PDZK1 overexpression (*P<0.05). Data in the graphs represent means±SD of five independent experiments. CFTR, cystic fibrosis transmembrane conductance regulator; ER, estrogen receptor; ERK, extracellular signal–regulated kinase; NHE3, sodium–hydrogen exchanger 3; PAR-2, proteinase-activated receptor 2; Rac1, ras-related C3 botulinum toxin substrate 1. Journal of Investigative Dermatology 2012 132, 2622-2631DOI: (10.1038/jid.2012.175) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions