Use of Self-Delivery siRNAs to Inhibit Gene Expression in an Organotypic Pachyonychia Congenita Model Robyn P. Hickerson, Manuel A. Flores, Devin Leake,

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Use of Self-Delivery siRNAs to Inhibit Gene Expression in an Organotypic Pachyonychia Congenita Model Robyn P. Hickerson, Manuel A. Flores, Devin Leake, Maria F. Lara, Christopher H. Contag, Sancy A. Leachman, Roger L. Kaspar Journal of Investigative Dermatology Volume 131, Issue 5, Pages 1037-1044 (May 2011) DOI: 10.1038/jid.2010.426 Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Specific inhibition of reporter protein in a dual fluorescent reporter human primary keratinocyte cell line using self-delivery small interfering RNAs (siRNAs). (a) Schematic representation of the lentiviral expression plasmids used to generate the dual reporter cell line. vTD171 expresses tandem tomato fluorescent protein (tdTOM), containing the CBL3 siRNA target site in the 3′untranslated region, under the control of the human ubiquitin C promoter. vTD147 expresses enhanced green fluorescent protein (EGFP) under the control of the human phosphoglycerate kinase (PGK) promoter. (b) Human primary epidermal keratinocyte progenitor (HPEKp) cells were transduced with vTD171 and sorted for cells expressing tdTOM. The collected cells were then transduced with vTD147 and sorted for cells expressing EGFP. The resulting cell line was positive for both tdTOM and EGFP expression in >95% of the cells. Cells were treated 24hours after seeding with 2μM (final concentration) of the indicated siRNAs (self-delivery nonspecific control K6a_513a.12 siRNA, non-self-delivery CBL3 siRNA, and self-delivery CBL3 siRNA) and imaged 96hours after treatment. Scale bar=100μm. Journal of Investigative Dermatology 2011 131, 1037-1044DOI: (10.1038/jid.2010.426) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Self-delivery enhanced green fluorescent protein (EGFP)-specific small interfering RNA (siRNA) inhibits reporter expression in transduced skin equivalents. (a) Human primary epidermal keratinocyte progenitor (HPEKp) cells were transduced with vTD152 lentivirus expressing EGFP containing the CBL3 siRNA target site in the 3′ untranslated region and used to generate epidermal equivalents (see Materials and Methods). (b) Assessment of self-delivery siRNA functional activity by fluorescence imaging. The skin equivalents were allowed to mature for ∼2 weeks before treatment with 2μM siRNA (unmodified nonspecific K6a_513a.12 siRNA, non-self-delivery CBL3 siRNA, or self-delivery CBL3 siRNA; in triplicate) every 48hours. Skin equivalents were repeatedly imaged every 48hours for EGFP fluorescence. (c) Sectioning of treated skin equivalents. On day 44, one of the three skin equivalents from each treatment group was frozen in optimal cutting temperature compound and sectioned (10μm). The slides were mounted with Hydromount containing 4′,6-diamidino-2-phenylindole (DAPI) to counterstain nuclei. Sections were imaged using a fluorescence microscope equipped with GFP and DAPI filter sets. Scale bar=50μm. Journal of Investigative Dermatology 2011 131, 1037-1044DOI: (10.1038/jid.2010.426) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Self-delivery K6a_513a.12 small interfering RNA (siRNA) selectively inhibits mutant K6a mRNA expression in skin equivalents prepared from pachyonychia congenita (PC) patient primary keratinocytes. (a) Timeline summarizing treatment schedule. (b) Skin equivalents prepared from patient keratinocytes were treated with 2μM self-delivery K6a_513a.12 and control siRNAs as indicated (non-self-delivery K6a_513a.12 siRNA, unmodified enhanced green fluorescent protein (EGFP)-specific siRNA, and self-delivery K6a_513a.12 siRNA; in triplicate). Total RNA was isolated and mutant (Mut; p.Asn171Lys) and wild-type (WT) K6a mRNA levels were determined by quantitative reverse transcription PCR relative to glyceraldehyde-3-phosphate dehydrogenase mRNA levels. Journal of Investigative Dermatology 2011 131, 1037-1044DOI: (10.1038/jid.2010.426) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions