Protein expression of the transcriptional regulator MI-ER1 alpha in adult mouse tissues.

Abstract:

:MI-ER1 is a novel transcriptional regulator that plays a critical role in embryonic development and is differentially expressed in breast carcinoma. The MI-ER1 protein sequence is highly conserved among species, with 95% identity between mouse and humans and 72% between Xenopus and mouse. There are two major protein isoforms, MI-ER1alpha and MI-ER1beta, which differ in the sequence of their C-terminus. MI-ER1alpha is of particular interest because it contains a consensus LXXLL nuclear receptor interaction motif and the current study was undertaken to determine the expression pattern of MI-ER1alpha protein in adult mouse tissues. Immunohistochemical analysis of paraffin-embedded tissue using an MI-ER1alpha-specific antibody revealed that the majority of mouse adult tissues examined showed very weak or no immunoreactivity; these included tissues of the lung, liver, intestine, uterus, spleen, lymph node, bladder as well as skeletal muscle. Interestingly, a subset of endocrine tissues displayed intense staining for MI-ER1alpha. Specifically, the islets of Langerhans, the zona glomerulosa and medulla of the adrenal gland, the ovary and the hypothalamus were intensely stained. In addition, both anterior and posterior pituitary showed moderate immunoreactivity, as did the parafollicular cells of the thyroid gland and Leydig cells and spermatids in the testes. Negative endocrine tissues included follicular cells of the thyroid gland and the X zone of the adrenal cortex. A few non-endocrine tissues displayed moderate immunoreactivity; these included all tubules and collecting ducts in the kidney, myocardial and endocardial layers of the heart, the hippocampal formation, pyramidal neurons in the cortex and the ductal epithelium of the mammary gland. In all cases, MI-ER1alpha immunoreactivity was cytoplasmic. This study represents the first immunohistochemical analysis of MI-ER1alpha expression in mammals and our data suggest that this transcriptional regulator plays a role in specific endocrine pathways.

journal_name

J Mol Histol

authors

Thorne LB,McCarthy PL,Paterno GD,Gillespie LL

doi

10.1007/s10735-007-9116-3

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

15-24

issue

1

eissn

1567-2379

issn

1567-2387

journal_volume

39

pub_type

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