Ultrastructural Cytochemical, Immunocytochemical and in Situ Hybridization Methods with Polyuridine Probes Detect MRNA in Human Mast Cell Granules

Overview

Journal Histochem J

Specialty Biochemistry

Date 2000 Sep 15

PMID 10987506

Citations 2

Authors

A M Dvorak

E S Morgan

Affiliations

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Abstract

Mature human mast cells are classical secretory cells that are filled with secretory-storage granules but are poorly endowed with visible free or membrane-bound cytoplasmic ribosomes. We recently reported close associations of ribosomes and various components essential to RNA metabolism in and close to human mast cell granules using multiple ultrastructural imaging methods. In view of these findings and an increased awareness of RNA sorting and localization to specific subcellular sites and organelles, we used human mast cells purified from non-tumour portions of lung samples resected at surgery for carcinoma and ultrastructural methods to investigate this further. Poly(U) probes were used to detect direct en grid binding, and radiolabelled as well as non-radiolabelled poly(U) probes were used in in situ hybridization protocols to detect poly(A)-positive pre-mRNA and mRNA in nuclear, cytoplasmic and granular compartments of mature human mast cells. Negative controls verified specificity of label; expected nuclear and cytoplasmic locations of poly(A)-positive RNA served as positive controls for each sample. These findings lend support to the hypothesis that site-specific synthesis in secretory-storage granules may occur in secretory cells.

Citing Articles

Ultrastructural immunolocalization of basic fibroblast growth factor to lipid bodies and secretory granules in human mast cells.

Dvorak A, Morgan E, Weller P Histochem J. 2002; 33(7):397-402.

PMID: 11858459 DOI: 10.1023/a:1013771827069.

Ultrastructural immunogold cytochemistry with autoimmune human sera and an antibody to uridine implicate human mast cell granules in RNA biology.

Dvorak A, Morgan E Histochem J. 2001; 32(11):685-96.

PMID: 11272809 DOI: 10.1023/a:1004119500801.

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