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Mechanistically-based Optimization of UV Radiation Therapy in Psoriasis

Information source: Department of Veterans Affairs
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Psoriasis

Intervention: Imiquimod (Drug); Clobetasol (Drug)

Phase: N/A

Status: Terminated

Sponsored by: Department of Veterans Affairs

Official(s) and/or principal investigator(s):
Kevin D Cooper, MD, Principal Investigator, Affiliation: VA Medical Center, Cleveland


The purpose of this study is 1) to determine whether Imiquimod or Steroid pretreatment modifies UVB laser light response resulting in increased cell death compared to UVB laser light alone; 2) to determine if pretreatment of psoriatic lesions with Imiquimod or Steroid prior to UVB laser light exposure selectively effects various T cell functions; 3) to determine clinical results from the Imiquimod/Steroid/UVB laser light and correlate those changes with immuno-histochemical changes in the skin; and 4) to determine if single high dose lesion limited UVB laser light intervention combined with Imiquimod or Steroid influences T cell changes

Clinical Details

Official title: Mechanistically-based Optimization of UV Radiation Therapy in Psoriasis

Study design: Allocation: Non-Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Factorial Assignment, Masking: Single Blind (Subject)

Primary outcome: Number of Subjects With Elevated MyxA

Secondary outcome:

Number of Subjects With Improvement in Lesional Psoriasis Area and Assessment (PASI) Score After Imiquimod and UVB Treatment

Number of Subjects With a 1.5 Fold Increase in mRNA Expression of GRAMD1A and DMXL2

Detailed description: The characteristic lesion of psoriasis is a sharply demarcated erythematous papule or plaque with excessive scaling due to hyperproliferating keratinocytes, infiltrating granulocytes, and a dense mononuclear infiltrate with activated T cells. To date, no one mechanism has been explanatory for the panoply of changes that occur in both the dermis and epidermis of psoriasis patients. Several key findings have shown that cutaneous T cells play a key role in the propagation of the disease; memory-type T cells home to the skin, specifically due to expression of cutaneous lymphocyte antigen (CLA), and are the main effector cells in psoriatic tissue responsible for the production of cytokines that result in exacerbated cutaneous inflammation. T cell recruitment is thought to occur in psoriasis, in part, as a result of cytokine and chemokine release from keratinocytes, macrophages, and endothelial cells. CLA-positive T cells migrate into the tissues where memory-effector T cells are activated and expand. This migration is critical to maintenance of the psoriasis lesions, because anti-LFA-1 antibodies (efalizumab) are effective in treating psoriasis, resulting in blood lymphocytosis and tissue depletion of T cells. Despite many years of using UVB phototherapy in the treatment of psoriasis, its mechanism of action is based mainly on in vitro exposures of isolated cells and on extrapolations from UV effects on normal skin, with little direct data from lesional skin. Previously, our studies determined optimal single efficacious dose using the Excimer laser, refined the mechanism of UVB action in psoriasis, developed key cytokine quantitative meth

- ods to assess targeted mRNA levels in psoriatic tissue after treatment, demonstrated that

regulatory T cells from psoriasis tissue and blood appear to have a functional defect, and demonstrated that UVA component of solar radiation is a critical and significant contributor to UV-induced in vivo immuno-suppression. All of these previous findings lead us to our current hypothesis that direct selective apoptotic effects on the T mem/Teff cells may result in decreased APC activation and IL-12 over-riding of Treg suppression and a re-balanced Tre: Tmem/eff cell ratio which in turn may have a sustained remittive effect (high duration multi-month clearing of a psoriasis lesion after a single UVB laser light treatment.)


Minimum age: 18 Years. Maximum age: 80 Years. Gender(s): Both.


Inclusion Criteria:

- The presence of plaque-type psoriasis in areas of the trunk, buttocks, or extremities

that are amenable to biopsy and evaluable disease in at least 2 cm target treatment sites separated by 1 cm

- Age 18-80, both genders, all ethnicities

- No contraindications to phototherapy or biopsy procedures

- No topical steroid, tar, phototherapy, Vitamin D, or retinoid therapy to target

lesions for at least 1 week prior to the study

- No systemic psoriasis therapy for at least four weeks prior to the study

- Able to give informed consent under IRB approval procedures

Exclusion Criteria:

- Photosensitivity disorders

- Active untreated diseases or medication usage which may interfere with UVB, wound

healing, or immune function

- Hypersensitivity to local anesthetic

- Inability to provide informed consent

- Pregnancy and /or lactating

Locations and Contacts

University Hospital Case Medical Center, Cleveland, Ohio 44106, United States

VA Medical Center, Cleveland, Cleveland, Ohio 44106, United States

Additional Information

The National Institute of Arthritis, Musculoskeletal, and Skin Diseases website providing fast facts on health topics, including psoriasis

This is the home page for the Murdough Family Center for Psoriasis.

Starting date: May 2007
Last updated: February 12, 2014

Page last updated: August 23, 2015

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