Abstract:
BACKGROUND:Tumour carbonic anhydrase IX (CAIX), a hypoxia-inducible tumour-associated cell surface enzyme, is thought to acidify the tumour microenvironment by hydrating CO2 to form protons and bicarbonate, but there is no definitive evidence for this in solid tumours in vivo. METHODS:We used 1H magnetic resonance spectroscopic imaging (MRSI) of the extracellular pH probe imidazolyl succinic acid (ISUCA) to measure and spatially map extracellular pH in HCT116 tumours transfected to express CAIX and empty vector controls in SCID mice. We also measured intracellular pH in situ with 31P MRS and measured lactate in freeze-clamped tumours. RESULTS:CAIX-expressing tumours had 0.15 pH-unit lower median extracellular pH than control tumours (pH 6.71 tumour vs pH 6.86 control, P = 0.01). Importantly, CAIX expression imposed an upper limit for tumour extracellular pH at 6.93. Despite the increased lactate concentration in CAIX-expressing tumours, 31P MRS showed no difference in intracellular pH, suggesting that CAIX acidifies only the tumour extracellular space. CONCLUSIONS:CAIX acidifies the tumour microenvironment, and also provides an extracellular pH control mechanism. We propose that CAIX thus acts as an extracellular pH-stat, maintaining an acidic tumour extracellular pH that is tolerated by cancer cells and favours invasion and metastasis.
journal_name
Br J Cancerjournal_title
British journal of cancerauthors
Lee SH,McIntyre D,Honess D,Hulikova A,Pacheco-Torres J,Cerdán S,Swietach P,Harris AL,Griffiths JRdoi
10.1038/s41416-018-0216-5subject
Has Abstractpub_date
2018-08-01 00:00:00pages
622-630issue
5eissn
0007-0920issn
1532-1827pii
10.1038/s41416-018-0216-5journal_volume
119pub_type
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