COMPARATIVE-STUDY ON THE EXPRESSION OF STRESS-RESPONSE PROTEIN (SRP) 72, SRP 27, ALPHA-B-CRYSTALLIN AND UBIQUITIN IN BRAIN-TUMORS - AN IMMUNOHISTOCHEMICAL INVESTIGATION

This immunohistochemical study compares the expression of stress-response (heat-shock) protein (srp) 72, srp 27, alphaB-crystallin and ubiquitin in 86 primary human brain tumours and 21 carcinoma metastases to the central nervous system. Normal brain tissues were included for control purposes. Serial sections of formalin-fixed, paraffin-embedded tissues were used. Most meningiomas (17/23), glioblastomas (11/12) and breast carcinoma metastases (9/10) and some astrocytomas (7/13), pituitary tumours (4/9) and lung cancer metastases (5/11) had tumour cells that reacted with one or more of the antibodies used. Around 43% of the meningiomas and 25% of the glioblastomas expressed srp 72 only. Sole expression of srp 27, alphaB-crystallin or ubiquitin was seen in several tumours. Some meningiomas (3/23) and breast cancer metastases (4/10) co-expressed srp 72 and srp 27, and 1/3 of the glioblastomas co-expressed srp 27 and alphaB-crystallin. We conclude that primary and metastatic tumours of the brain produce stress-related proteins and that certain tumours concurrently express two or more srp's.