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September 1994

Clinical Improvement Following Dermabrasion of Photoaged Skin Correlates With Synthesis of Collagen I

Author Affiliations

From the Departments of Dermatology (Drs Nelson, Majmudar, Griffiths, Dixon, Tavakkol, Woodbury, Voorhees, and Johnson and Messrs Gillard and Hamilton) and Otorhinolaryngology and Surgery (Plastic Surgery) (Drs Nelson and Johnson), University of Michigan, Ann Arbor. Dr Griffiths is now with the Department of Medicine, Section of Dermatology, University of Manchester, Salford, England, and Dr Tavakkol is with Hoffmann-LaRoche Inc, Nutley, NJ,

Arch Dermatol. 1994;130(9):1136-1142. doi:10.1001/archderm.1994.01690090060008

Background and Design:  The ability of superficial dermabrasion to improve clinical features of photoaged skin is well known, but the specific biological mechanisms involved are poorly understood. The so-called repair zone, as visualized by routine histologic examination, has been attributed to new collagen formation within the papillary dermis and may be responsible for clinical improvement following dermabrasion. We investigated molecular and histologic events occurring in dermabraded skin and correlated them with clinical improvement. Ten photoaged patients (mean age, 59 years) underwent facial dermabrasion to the level of the papillary dermis. Clinical severity of photoaging was graded in a blinded manner at baseline and 12 weeks after dermabrasion. Biopsy specimens obtained at baseline and 3 and 12 weeks after dermabrasion were analyzed histologically and by in situ hybridization for fibroblast procollagen I mRNA, immunohistologically and by Western blotting with a monoclonal antibody specific for the aminoterminal cleavage site of procollagen I.

Results:  Masson's trichrome staining demonstrated an increase in collagen from baseline (as an upper dermal band in the dermabrasion ''repair zone'') at 3 and 12 weeks' postdermabrasion. Immunohistologic examination demonstrated papillary dermal fibroblast staining for procollagen I at baseline that increased by threefold at 3 weeks' postdermabrasion and by 1.5-fold at 12 weeks' postdermabrasion. Western blotting demonstrated an average-fold increase in pN collagen I of 4.2± 1.5 at 3 weeks and of 2.7±0.7 at 12 weeks. By in situ hybridization, baseline levels of procollagen I mRNA in papillary dermal fibroblasts increased sixfold at weeks 3 and 12 postdermabrasion. Increase in procollagen I mRNA correlated with clinical improvement, ie, reduction in wrinkling.

Conclusion:  Superficial dermabrasion clinically improves photoaged skin, and this improvement correlates strongly with increased collagen I gene expression.(Arch Dermatol. 1994;130:1136-1142)

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