Lack of evidence for OSMR and RET gene mutations in a Chinese family with friction melanosis

Friction-Aggravated Skin Disorders-A Review of Mechanism and Related Diseases

ABSTRACT

Skin is subject to frequent friction injury. Friction affects different structures of the skin, including keratinocytes, melanocytes, fibroblasts, and follicular units. Friction can also stimulate cytokine production. Friction is sensed by the mechanoreceptors, resulting in signal transduction to the nucleus, activating transcription factors and mechanoresponsive genes. Numerous friction-aggravated diseases have been identified, including inflammatory, depositional, follicular, genetic, infectious, and vesiculobullous disorders. Friction, as a potential modifiable aggravator, should be considered when skin diseases are located at friction-prone areas.

The Clinical Spectrum of Multiple Endocrine Neoplasia Type 2A with Cutaneous Lichen Amyloidosis in Ethnic Han Chinese

This study systematically reviewed previous literatures and analyzed the genotype-phenotype relationship between the multiple endocrine neoplasia type 2A (MEN 2A)-cutaneous lichen amyloidosis (CLA) and RET/OSMR/IL31RA mutations. RET/OSMR/IL31RA screening was performed on 8 RET-carriers from 3 independent Chinese MEN 2A families. Besides, 51 MEN 2A-CLA patients in 116 RET carriers from literatures were clustered and analyzed. Our results indicated that almost all MEN 2A-CLA patients exhibited CLA which was located in the scapular region and carried RET mutation at codon 634. Meanwhile, we firstly described MEN 2A-CLA here in Chinese Han patient with RET p.C634F mutation.

Symmetrical acrokeratoderma: A peculiar entity in China? Clinicopathologic and immunopathologic study of 34 new cases

BACKGROUND

Symmetrical acrokeratoderma seems to be a new disorder in China, and 138 cases have been reported in the Chinese literature.

OBJECTIVE

We sought to summarize the clinicopathologic features and immunophenotyping of inflammatory cells in 34 new cases.

METHODS

Clinical data of 34 patients were prospectively collected over 4 years. Histopathology and immunostaining of infiltrated cells were performed in 27 and 9 patients, respectively.

RESULTS

Brown to black hyperkeratotic patches were symmetrically distributed over the acral regions in 33 cases and on the scalp in 1 case, with a whitish change after water contact or sweating. The condition was aggravated in summer and alleviated in winter in 33 patients. History of ichthyosis vulgaris was seen in 23 cases. The typical histopathology included epidermal hyperkeratosis, acanthosis, and papillary dermal perivascular infiltrate of lymphohistiocytes. Number of CD3(+), CD4(+), and CD8(+) cells increased in lesional and perilesional skin compared with normal-appearing skin. The skin lesions developed slowly but were confined to the acral predilection sites after the mean follow-up of 25.4 ± 13.8 months.

LIMITATIONS

The follow-up time was short.

CONCLUSION

This disorder may represent a peculiar dermatosis that is frequently associated with ichthyosis vulgaris. No specific therapy is available for the disorder.