Advantages of Sirius Red staining for quantitative morphometric collagen measurements in lungs

Experimental Lung Research
W MalkuschJ Bruch

Abstract

Sirius Red staining is presented as a method for collagen determination, enabling quantitative morphometric measurements to be performed in locally defined tissue areas. The advantage of this method is especially shown for alveolar lung tissue. By excluding the bronchial areas in the tissue sections, the differences in the degree of fibrosis proved to be more discrete after different loads of quartz dust than by any other method. The difference of 12 micrograms collagen measured colorimetrically represented a 1.2-fold increase. The collagen measured in the alveolar tissue by the morphometric method rose from 9.8 to 28.6%. This is a 2.9-fold increase, underlining the vast improvement in sensitivity. Thus, this method is specifically suitable for the evaluation of very small fibrotic lesions. The quartz doses given are particularly low compared to most other investigations. Histologic lung and lymph node sections from female Wistar rats injected intratracheally with differing quantities of quartz dust (0.03, 0.1, 0.5, 1.75 mg) were stained with Sirius Red, and the collagen fibers measured with a quantitative image analysis. The results for lymph nodes using different methods (wet weight determination, quantitative measurement of ...Continue Reading

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