Open Access

Viability of diffuse large B-cell lymphoma cells is regulated by kynurenine 3-monooxygenase activity

  • Authors:
    • Nanaka Morita
    • Masato Hoshi
    • Takeshi Hara
    • Soranobu Ninomiya
    • Taisuke Enoki
    • Misao Yoneda
    • Hisashi Tsurumi
    • Kuniaki Saito
  • View Affiliations

  • Published online on: September 17, 2021     https://doi.org/10.3892/ol.2021.13051
  • Article Number: 790
  • Copyright: © Morita et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Diffuse large B‑cell lymphoma (DLBCL) is a clinically heterogeneous lymphoid malignancy that is the most common type of lymphoma in Japan. Previous studies have demonstrated that patients with DLBCL have a poor prognosis due to increased levels of indoleamine 2,3‑dioxygnase and kynurenine (KYN). However, the roles of metabolites acting downstream of KYN and associated enzymes are not fully understood. The present study investigated the role of kynurenine 3‑monooxygenase (KMO), which catalyzes the conversion of KYN to 3‑hydroxykynurenine (3‑HK), using serum samples from patients with DLBCL and human DLBCL cell lines with different KMO expression [STR‑428 cells with high levels of KMO expression (KMOhigh) and KML‑1 cells with low levels of KMO expression (KMOlow)]. Serum samples from 28 patients with DLBCL and 34 healthy volunteers were used to investigate the association between prognosis and KMO activity or 3‑HK levels. Furthermore, to investigate the roles of KMO and its related metabolites, STR‑428 and KML‑1 cell lines, and the lymph nodes of patients with DLBCL were analyzed by reverse transcription‑quantitative PCR for KMO, KYNU, 3‑hydroxyanthranilate‑3,4‑dioxygenase and quinolinate phosphoribosyltransferase, by western blotting, and immunohistochemical or immunofluorescence staining for KMO, and by cell viability and NAD+/NADH assays. KYN pathway metabolites in serum samples were measured by HPLC. Serum 3‑HK levels were regulated independently of serum KYN levels, and increased serum 3‑HK levels and KMO activity were found to be associated with worse disease progression. Notably, the addition of KMO inhibitors and 3‑HK negatively and positively regulated the viability of DLBCL cells, respectively. Furthermore, NAD+ levels in KMOhigh STR‑428 cells were significantly higher than those in KMOlow KML‑1 cells. These results suggested that 3‑HK generated by KMO activity may be involved in the regulation of DLBCL cell viability via NAD+ synthesis.
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November-2021
Volume 22 Issue 5

Print ISSN: 1792-1074
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Spandidos Publications style
Morita N, Hoshi M, Hara T, Ninomiya S, Enoki T, Yoneda M, Tsurumi H and Saito K: Viability of diffuse large B-cell lymphoma cells is regulated by kynurenine 3-monooxygenase activity. Oncol Lett 22: 790, 2021.
APA
Morita, N., Hoshi, M., Hara, T., Ninomiya, S., Enoki, T., Yoneda, M. ... Saito, K. (2021). Viability of diffuse large B-cell lymphoma cells is regulated by kynurenine 3-monooxygenase activity. Oncology Letters, 22, 790. https://doi.org/10.3892/ol.2021.13051
MLA
Morita, N., Hoshi, M., Hara, T., Ninomiya, S., Enoki, T., Yoneda, M., Tsurumi, H., Saito, K."Viability of diffuse large B-cell lymphoma cells is regulated by kynurenine 3-monooxygenase activity". Oncology Letters 22.5 (2021): 790.
Chicago
Morita, N., Hoshi, M., Hara, T., Ninomiya, S., Enoki, T., Yoneda, M., Tsurumi, H., Saito, K."Viability of diffuse large B-cell lymphoma cells is regulated by kynurenine 3-monooxygenase activity". Oncology Letters 22, no. 5 (2021): 790. https://doi.org/10.3892/ol.2021.13051