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Predicting Psoriasis Drug Efficacy in Human Skin [INFOGRAPHIC]

By Zara Puckrin, BSc

Testing your dermatological treatments in human skin can accelerate lead optimization. But how are models using human tissue established? In this infographic, we demonstrate how scientists at REPROCELL helped one Pharma company accelerate the optimization of their lead Psoriasis compound. By using human fresh skin, researchers were able to determine the optimal concentration of the treatment and confirm whether it reduced inflammation.

Determining drug potency in human skin

Before investigating the therapeutic effect of their articles on the target population, our client wanted to determine potency. To determine the therapeutic dose, we decided to test the lead, backup, and reference compound at four different concentrations. This experimental design would require relatively high throughput, so we opted for our induced psoriasis model, rather than diseased biopsies, for this first phase. Compound efficacy was measured by the reduction in cytokine gene expression and release from the tissues.

How to determine drug potency using human skin tissue

Experimental method for determining drug potency in human skin

Our scientists procured healthy, fresh skin tissue from our clinical networks, then created 3mm punch biopsies from this living sample. These punch biopsies were then incubated in culture media with a chemical cocktail designed to induce a psoriasis phenotype. Following 24 hours of incubation, the lead, reference, and backup compounds were tested in the skin biopsies at four different concentrations. The culture media was then removed, and the level of inflammatory cytokines in the supernatant was determined using ELISA. Gene expression data was also gained using PCR, and the optimum concentration of the lead compound was determined from these results.

Methodology for determining drug potency using human skin tissue

Determine drug efficacy in human diseased skin

Now that we knew the optimal concentration of the lead compound, we could concentrate on exploring whether the compound had the desired effect on the patient population. To achieve this, we tested the lead compound ex vivo on diseased skin biopsies from patients with psoriasis - as before, cytokine release and gene expression were used to determine drug efficacy.

How to determine drug efficacy using human skin tissue

Experimental method for determining drug efficacy in human diseased skin

From our clinical network, our researchers procured skin biopsies from three donors with psoriasis. One normal skin biopsy and two plaque biopsies were procured per donor. Each biopsy was cultured at the air-liquid interface in culture media and exposed to the lead compound at the optimal concentration determined previously. Following incubation, the supernatant and skin biopsies were collected and used to determine compound efficacy. All of the data prepared in the study was collated and provided to the client as a report. 

Methodology for determining drug efficacy using human skin tissue

Summarising the aims of this study

In this infographic, we summarize the aims, methods, and findings of a study using human fresh tissue. Through the initial pilot study, scientists at REPROCELL were able to estimate the optimal concentration of the compound for use in Phase 2; which included healthy and diseased skin biopsies from Psoriasis donors. You can find out more about our ex vivo psoriasis models here.

Call to action: Find out more about our psoriasis assays in human skin

Editor's note: This blog was first published in September 2020 and has since been updated for accuracy and clarity.

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