Identification of prolactin-like proteins synthesized by normal murine lymphocytes

David W. Montgomery, Jane A. LeFevre, Ellen D. Ulrich, Cynthia R. Adamson, Charles F. Zukoski

Research output: Contribution to journalArticlepeer-review

82 Scopus citations


Cultured murine lymphoid cells release a PRL-like immunoreactive (IR) protein which may be important in immunity, as anti-PRL antisera inhibit lymphocyte proliferation in vitro. We examined culture supematants (SNs) and cell lysates from concanavalin A (Con A) activated murine thymocytes to identify these proteins. Western blot analysis of cell lysates revealed three specifically-stained PRL-IRs. A doublet of bands at 35.6 and 33.6 kDa was associated with the particulate fraction of the cell. These PRL-IRs were present in lymphocytes independently of mitogen stimulation. In contrast, a 22 kDa PRL-IR was only produced in mitogen stimulated cells, and was specifically immunoprecipitated with anti-PRL antiserum. In addition, all three PRLlike IRs incorporated 35S-methionine in vitro, indicating that they are synthesized by these cells. Only the 22 kDa PRL-like protein was present in culture medium from stimulated cells, suggesting that this may be the PRL bioactivity previously demonstrated in SNs from murine lymphocytes.

Original languageEnglish (US)
Pages (from-to)2601-2603
Number of pages3
Issue number5
StatePublished - Nov 1990

ASJC Scopus subject areas

  • Endocrinology


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