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Background  Telocytes (TCs) is an interstitial cell with extremely long and thin telopodes (Tps) with thin segments (podomers) and dilations (podoms) to interact with neighboring cells. TCs have been found in different organs, while there is still a lack of TCs-specific biomarkers to distinguish TCs from the other cells.    Results  We compared gene expression profiles of murine pulmonary TCs on days 5 (TC5) and days 10 (TC10) with mesenchymal stem cells (MSCs), fibroblasts (Fbs), alveolar type II cells (ATII), airway basal cells (ABCs), proximal airway cells (PACs), CD8 +  T cells from bronchial lymph nodes (T-BL), and CD8 +  T cells from lungs (T-LL). The chromosome 17 and 18 genes were extracted for further analysis. The TCs-specific genes and functional networks were identified and analyzed by bioinformatics tools. 16 and 10 of TCs-specific genes were up-regulated and 68 and 22 were down-regulated in chromosome 17 and 18, as compared with other cells respectively. Of them, Mapk14 and Trem2 were up-regulated to indicate the biological function of TCs in immune regulation, and up-regulated MCFD2 and down-regulated E4F1 and PDCD2 had an association with tissue homeostasis for TCs. Over-expressed Dpysl3 may promote TCs self-proliferation and cell-cell network forming.    Conclusions  The differential gene expression in chromosomes 17 and 18 clearly revealed that TCs were the distinctive type of interstitial cells. Our data also indicates that TCs may play a dual role in immune surveillance and immune homoeostasis to keep from immune disorder in acute and chronic pulmonary diseases. TCs also participated in proliferation, differentiation and regeneration.    Reviewers  This article was reviewed by Qing Kay Li and Dragos Cretoiu.    Electronic supplementary material  The online version of this article (doi:10.1186/s13062-015-0042-0) contains supplementary material, which is available to authorized users.

biology direct

Global analyses of Chromosome 17 and 18 genes of lung telocytes compared with mesenchymal stem cells, fibroblasts, alveolar type II cells, airway epithelial cells, and lymphocytes