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pH Distributions in Transplanted Neural Tumors and Normal Tissues of BDIX Rats as Measured with pH Microelectrodes¹

Institut für Zellbiologie (Tumorforschung), Universität Essen (GH), Hufelandstrasse 55, D-4300 Essen 1, Federal Republic of Germany [E. J., M. F. R.], and Max Plank-Institut für Systemphysiologie, Rheinlanddamm 201, D-4600 Dortmund, Federal Republic of Germany [H. B.]

The distribution of pH values was measured in transplanted neuroectodermal TV1A tumors and in brain and kidney of BDIX rats in vivo. Tissue damage during pH measurements could be minimized by the use of Hinke-type pH glass microelectrodes with maximum diameters of the pH-sensitive tips of 10 µm (sensitivity, 58 to 60 mV/pH unit at 37°; response time (95%), 3 sec; drift, 0.01 pH unit/hr). The advantages and limitations of this technique are discussed in relation to other methods for the analysis of extracellular pH.

In tumors weighing 1.0 to 2.5 g, pH values ranged from 6.8 to 7.1 (mean, 7.0). The pH distribution in tumors weighing 4 to 6 g was shifted to slightly lower values, with an average pH of 6.9 (range, 6.7 to 7.1). No marked pH differences were found between the tumors and normal tissues. The pH values measured in brain and kidney ranged from 6.6 to 7.3 (mean, 7.0) and 6.7 to 7.3 (mean, 7.1), respectively. Within single tumors, local pH variations in the range of 0.2 to 0.3 pH unit were observed. The local pH values measured in certain tumor areas are, however, sufficiently low to partially inhibit proliferation and colony formation in cultured malignant cells.

¹ Research supported by the Deutsche Forschungsgemeinschaft (Ra 119/8).

² To whom requests for reprints should be addressed.

Received 8/10/81. Accepted 1/ 7/82.

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