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Biogenic amines and tumor-vascular interaction in melanomas

Author(s): Bhanu Iyengar

Journal: Journal of Solid Tumors
ISSN 1925-4067

Volume: 1;
Issue: 2;
Date: 2011;
Original page

BackgroundIn nodular melanomas in vertical growth phase, tumor-vascular complexes (TVC), with perivascular mantle zone (PMZ) of 5 to 6 layers (L1-L5) of tumor cells are formed around angiogenic vessels at the tumor-stroma interphase, showing organized neural differentiaton. The present study explores the sequence of biogenic amines positivity in relation to angiogenesis, utilizing the TVC as a 3D model.MethodsThe sequence of positivity for Nestin (Nes), GFAP, indoleamines: serotonin (SER)/melatonin (MLT), catecholamines: dopamine (DA)/noradrenalin (NA), pigment (Pig); dopa oxidase (DO); and related mitosis in layers of the PMZ (L1-L5) was assessed in 897 developing TVCs using 5 ┬Ám serial paraffin and frozen sections. Statistical Analysis: ANOVA: Kruskal-Wallis One Way Analysis of Variance; All Pairwise Multiple Comparison Procedures (Tukey Test).ResultsNes, GFAP appear in L1/L2, next indoleamines (serotonin/melatonin) in L2/L3 associated with mitosis. DA is positive in L3/L4 coinciding with DO which peaks in L4 with NA, Pig appears in L4/L5. Mitosis in L2/L3 is associated with indoleamine positive cells which remain in L2/L3, with catecholamine positive cells moving into L4/L5 thus establishing a polarity. ConclusionThus, the angiogenic vessel confers polarity and an embryonal microenvironment in the PMZ, the aggressive melanoma cells functioning as neuronal stem cells to resemble early neurogenesis of bio-aminergic cells.

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