| 1. |
- Liu, Yehai, et al.
(författare)
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Prognostic significance of matrix metalloproteinase-20 overexpression in laryngeal squamous cell carcinoma
- 2011
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Ingår i: Acta Oto-Laryngologica. - : Informa UK Limited. - 0001-6489 .- 1651-2251. ; 131:7, s. 769-773
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Tidskriftsartikel (refereegranskat)abstract
- Conclusion: Matrix metalloproteinase (MMP)-20 is overexpressed in laryngeal squamous cell carcinoma (LSCC) compared with the adjacent normal laryngeal epithelium and MMP-20 plays a role in lymph node metastasis. Overexpression of MMP-20 may be used as a significant prognostic factor for lymph node metastasis. All the findings indicate that MMP-20 may play a role in the initiation and progression of LSCC. Objective: The MMPs are a gene family of zinc-dependent endopeptidases that have been implicated in tumor invasion and metastasis, and MMP-20 is a new member of the MMP family. The purpose of this study was to investigate whether MMP-20 is overexpressed in human LSCC and, if so, the significance of its overexpression in relation to clinical parameters. Methods: We analyzed 33 cases of LSCC with RT-PCR and 73 cases of LSCC with immunohistochemistry compared with normal laryngeal epithelium. Results: We found that MMP-20 is overexpresssed in LSCC compared with the adjacent normal laryngeal epithelium.
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| 2. |
- Wienecke, Jacob, et al.
(författare)
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Spinal Cord Injury Enables Aromatic l-Amino Acid Decarboxylase Cells to Synthesize Monoamines.
- 2014
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Ingår i: The Journal of Neuroscience. - 1529-2401. ; 34:36, s. 11984-12000
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Tidskriftsartikel (refereegranskat)abstract
- Serotonin (5-HT), an important modulator of both sensory and motor functions in the mammalian spinal cord, originates mainly in the raphe nuclei of the brainstem. However, following complete transection of the spinal cord, small amounts of 5-HT remain detectable below the lesion. It has been suggested, but not proven, that this residual 5-HT is produced by intraspinal 5-HT neurons. Here, we show by immunohistochemical techniques that cells containing the enzyme aromatic l-amino acid decarboxylase (AADC) occur not only near the central canal, as reported by others, but also in the intermediate zone and dorsal horn of the spinal gray matter. We show that, following complete transection of the rat spinal cord at S2 level, AADC cells distal to the lesion acquire the ability to produce 5-HT from its immediate precursor, 5-hydroxytryptophan. Our results indicate that this phenotypic change in spinal AADC cells is initiated by the loss of descending 5-HT projections due to spinal cord injury (SCI). By in vivo and in vitro electrophysiology, we show that 5-HT produced by AADC cells increases the excitability of spinal motoneurons. The phenotypic change in AADC cells appears to result from a loss of inhibition by descending 5-HT neurons and to be mediated by 5-HT1B receptors expressed by AADC cells. These findings indicate that AADC cells are a potential source of 5-HT at spinal levels below an SCI. The production of 5-HT by AADC cells, together with an upregulation of 5-HT2 receptors, offers a partial explanation of hyperreflexia below a chronic SCI.
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