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

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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 supernatants (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 PRL-like 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
Publication statusPublished - Nov 1990


ASJC Scopus subject areas

  • Endocrinology
  • Endocrinology, Diabetes and Metabolism

Cite this

Montgomery, D. W., LeFevre, J. A., Ulrich, E. D., Adamson, C. R., & Zukoski, C. F. (1990). Identification of prolactin-like proteins synthesized by normal murine lymphocytes. Endocrinology, 127(5), 2601-2603.