Evaluation of lactate as a 1H nuclear magnetic resonance spectroscopy index for noninvasive prediction and early detection of tumor response to radiation therapy in EMT6 tumors.

Abstract:

:In a recent study (Int. J. Radiat. Oncol. Biol. Phys. 36, 635-639, 1996), 1H nuclear magnetic resonance (NMR) spectroscopy was used to demonstrate significant decreases in lactate levels after gamma irradiation of radiosensitive RIF-1 tumors in vitro. For comparison, we have examined the effects of gamma radiation on lactate levels in the more radioresistant EMT6 tumor. Single-slice (5-6 mm thick) localized 1H spectra of subcutaneous RIF-1 (untreated) and EMT6 tumors (pretreatment, 24 and 48 h postirradiation with 4, 10 or 20 Gy of gamma radiation) were measured by the selective multiple quantum coherence transfer method (Sel-MQC, approximately 4 min acquisition time). Both pretreatment lactate levels and pretreatment lactate dehydrogenase (LDH) activities were found to be similar in RIF-1 and EMT6 tumors, suggesting that steady-state lactate levels are unlikely to be reliable indices for predicting response to radiation therapy. After 10 Gy gamma irradiation, EMT6 tumors showed a 21% decrease relative to pretreatment lactate levels at 48 h (1.04 +/- 0.22 to 0.82 +/- 0.16; P = 0.06); after 20 Gy a 40% decrease was observed at 48 h (1.34 +/- 0.27 to 0.81 +/- 0.10; P = 0.07). No significant changes in lactate levels were observed in control EMT6 tumors or in tumors treated with 4 Gy of gamma radiation, in contrast to changes detected previously in RIF-1 tumors, which showed a significant decrease in lactate by 48 h for both 2 and 4 Gy. The decreased effect of radiation on lactate levels in EMT6 compared to RIF-1 tumors may be attributed to the higher hypoxic fraction and lower radiosensitivity of EMT6 tumors (Int. J. Radiat. Oncol. Biol. Phys. 10, 695-712, 1984). The decrease in lactate levels did not, however, strictly reflect the extent of the response to therapy for the high dose of 20 Gy. This study together with our earlier study (Int. J. Radiat. Oncol. Biol. Phys. 36, 635-639, 1996) provides evidence to support the hypothesis that changes in steady-state tumor lactate levels may serve as sensitive early indices of tumor response to gamma radiation at doses of the order of 2 to 4 Gy.

journal_name

Radiat Res

journal_title

Radiation research

authors

Aboagye EO,Bhujwalla ZM,He Q,Glickson JD

subject

Has Abstract

pub_date

1998-07-01 00:00:00

pages

38-42

issue

1

eissn

0033-7587

issn

1938-5404

journal_volume

150

pub_type

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