A serum-free medium for culturing lactogen dependent and autonomous NB2 node lymphoma cells

Area of Science:

• Cell Biology
• Biotechnology
• Endocrinology

Background:

• Traditional media for lactogen bioassays often use horse serum (HS), which exhibits batch-to-batch variability.
• Inconsistent HS suitability and modulating factors can affect the prolactin (PRL)-induced growth response of Nb2-11C cells.

Purpose of the Study:

• To develop and evaluate a serum-free, hormone-free medium (SF2) for the Nb2 rat lymphoma bioassay.
• To assess the suitability of SF2 for supporting the growth of lactogen-responsive cells and cell lines.

Main Methods:

• Design and implementation of a novel serum-free, hormone-free medium (SF2).
• Culturing Nb2-11C cells and spontaneously proliferating cell lines (Nb2-SP, Nb2-HSP) in SF2 and traditional media.
• Evaluating cell growth, lactogen response, and cell characteristics under various conditions.

Main Results:

• SF2 supported Nb2-11C cell growth effectively at low human growth hormone (hGH) levels, but less so at higher concentrations.
• Corticosterone was found to be toxic to Nb2-11C cells in SF2.
• While SF2 supported long-term cell proliferation, growth rates were generally lower than in 10% HS, though they increased over time in adapted cell lines.

Conclusions:

• SF2 offers a consistent alternative to HS for lactogen bioassays, though growth rates may be reduced.
• Long-term culture in SF2 can lead to adaptation and altered lactogen responsiveness in certain cell lines.
• Further research is needed to optimize SF2 for maximal growth and responsiveness in lactogen bioassays.