Endobronchial mass developing 19 years after total thyroidectomy due to follicular thyroid carcinoma.

Endobronchial metastasis from thyroid follicular carcinoma is a rare manifestation. We describe a case of 62-year-old woman who underwent total thyroidectomy due to thyroid follicular carcinoma 19 years previously. Computerized tomography and bronchoscopy suggested an endobronchial enhancing nodule in the right bronchus intermedius, resulting in right middle lobe (RML) and right lower lobe (RLL) collapse. A biopsy specimen showed thyroid follicular carcinoma identical to that taken from a specimen previously. She underwent metastectomy and high-dose radioactive iodine ablation therapy. To our knowledge, this patient represents the first case of endobronchial metastasis with a long past history of thyroid follicular carcinoma.

Inhibitory effect of CXC chemokine receptor 4 antagonist AMD3100 on bleomycin induced murine pulmonary fibrosis.

CXC chemokine receptor 4 (CXCR4), which binds the stromal cell-derived factor-1 (SDF-1), has been shown to play a critical role in mobilizing the bone marrow (BM)-derived stem cells and inflammatory cells. We studied the effects of AMD3100, CXCR4 antagonist, on a murine bleomycin-induced pulmonary fibrosis model. Treatment of mice with AMD3100 in bleomycin-treated mice resulted in the decrease of SDF-1 in bronchoalveolar lavage (BAL) fluids at an early stage and was followed by the decrease of fibrocytes in the lung. AMD3100 treatment decreased the SDF-1 mRNA expression, fibrocyte numbers in the lung at an early stage (day 3) and CXCR4 expression at the later stage (day 7 and 21) after bleomycin injury. The collagen content and pulmonary fibrosis were significantly attenuated by AMD3100 treatment in later stage of bleomycin injury. AMD3100 treatment also decreased the murine mesenchymal and hematopoietic stem cell chemotaxis when either in the stimulation with bleomycin treated lung lysates or SDF-1 in vitro. In BM stem cell experiments, the phosphorylation of p38 MAPK which was induced by SDF-1 was significantly blocked by addition of AMD3100. Our data suggest that AMD3100 might be effective in preventing the pulmonary fibrosis by inhibiting the fibrocyte mobilization to the injured lung via blocking the SDF-1/CXCR4 axis.