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With largely unknown functions, PIP has been implicated in breast cancer and metastasis, host defense processes and T lymphocyte apoptosis. To begin to address PIP function in vivo, we generated the PIP null mouse (Pip<jats:sup>\u2212\/\u2212<\/jats:sup>mouse). Additionally, to determine the effect of the loss of PIP on gene expression and to gain insight into some of the molecular mechanisms underlying PIP function, microarray analysis of the submandibular gland was also undertaken. Pip<jats:sup>\u2212\/\u2212<\/jats:sup>mice developed normally with no overt differences in behaviour or gross morphology and were fertile. However, histological examination of 3-month-old Pip<jats:sup>\u2212\/\u2212<\/jats:sup>mice sometimes showed enlarged submandibular lymph nodes, lymphocytic aggregations within the prostate lobes, and enlarged medulla in the thymus. Functional analysis of gene expression revealed sets of multiple differentially expressed genes associated with cell death and survival, lipid metabolism, inflammation, immune disease, and cancer, as a consequence of mPIP abrogation. Taken together, these studies lend support to an immunomodulatory role for PIP in vivo and provide further insights into potentially novel signaling pathways and regulatory networks for PIP.<\/jats:p>","DOI":"10.1139\/y09-077","type":"journal-article","created":{"date-parts":[[2009,11,2]],"date-time":"2009-11-02T13:04:33Z","timestamp":1257167073000},"page":"859-872","source":"Crossref","is-referenced-by-count":21,"title":["Generation and initial characterization of the prolactin-inducible protein (PIP) null mouse: accompanying global changes in gene expression in the submandibular glandThis article is one of a selection of papers published in a special issue celebrating the 125th anniversary of the Faculty of Medicine at the University of Manitoba."],"prefix":"10.1139","volume":"87","author":[{"given":"A.","family":"Blanchard","sequence":"first","affiliation":[{"name":"Department of Pathology and Department of Physiology, Faculty of Medicine, University of Manitoba, 401\u2013727 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