Thy-1+ dendritic cells express truncated form of POMC mRNA.

Abstract:

:The present study was designed to examine the expression of proopiomelanocortin (POMC) and its related derivative peptide adrenocorticotropic hormone (ACTH) in murine derived Thy-1+ dendritic cells. Immunostaining using a polyclonal antibody specific to ACTH and parent POMC molecule indicated the presence of POMC and its derivative peptide, ACTH, in cultures of Thy-1+ dendritic cells. To explore whether the POMC peptide is present as a reservoir or synthesized de novo in Thy-1+ dendritic cells. Northern blot analysis using 30-mer oligonucleotide probe for alpha-MSH/ACTH precursor POMC was carried out in total RNA from these cells. Northern blot analysis revealed the presence of POMC like mRNA transcript. However, the observed size of transcript was smaller (approximately 0.9 kb) than that expressed by murine AtT20 cells (approximately 1.2 kb), an anterior pituitary tumor cell line used as a positive control. These observations suggest that the epidermal Thy-1+ lymphocytes, like thymic lymphocytes, might serve the epidermis as one source for the synthesis of POMC. The synthesis and presence of POMC in the epidermis may be related to some of the pigmentary anomalies observed in many mucocutaneous disorders.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Farooqui JZ,Medrano EE,Boissy RE,Tigelaar RE,Nordlund JJ

doi

10.1111/j.1600-0625.1995.tb00208.x

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

297-301

issue

5

eissn

0906-6705

issn

1600-0625

journal_volume

4

pub_type

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