A colorimetric assay to evaluate the chemotherapeutic response of children with acute lymphoblastic leukemia (ALL) employing achatininH: a 9-O-acetyl sialic acid binding lectin.
Employing a 9-O-acetyl sialic acid binding lectin, Achatinin(H) (ATNH), we have reported a non-invasive, blood based lymphoproliferation assay which measures the maximal lymphoproliferative dose (MLD) of ATN(H) to assess the status of 9-O-acetylated sialoglycoconjugates (9-OAcSGs) in patients with Acute lymphoblastic leukemia (ALL) (Mandal C, Sinha D, Sharma V, Bhattacharya DK. O-acetyl sialic acid binding lectin, as a probe for detection of subtle changes on the cell surface induced during acute lymphoblastic leukemia [ALL] and its clinical application. Ind J Biochem Biophys 1997;34:82; Sinha D, Mandal C, Bhattacharya DK. Development of a simple blood based lymphoproliferation assay to assess the clinical status of patients with acute lymphoblastic leukemia. Leuk Res 1999;13:309-312; Sinha D, Mandal C, Bhattacharya DK. A novel method for prognostic evaluation of childhood acute lymphoblastic leukemia. Leukemia 1999;13[in press]). Although the expression of 9-OAcSGs clearly serves as an index of treatment outcome, the assay has limitations in that it requires radioisotopes, i.e. [3H]-TdR. Therefore a colorimetric assay was developed as an alternative approach. The pre-treatment MLD, as measured by the colorimetric assay, was 0.15 +/- 0.02 microg which progressively increased during consolidation therapy (1.40 +/- 0.39 microg), maintenance therapy (4.20 +/- 1.60 microg) and in followed-up cases (5.20 +/- 0.43 microg) but sharply declined following relapse (0.25 +/- 0.02 microg). The colorimetric assay also showed a good correlation with radiometric assay (r = + 0.93) and their mean coefficient of inter-assay precision were also comparable (15.53% versus 14.86%). We therefore propose that the colorimetric assay is a safe, non-radiometric, user-friendly alternative for assessing individual chemotherapeutic responses in childhood ALL.
Sinha
D
D
Department of Immunobiology, Indian Institute of Chemical Biology, Calcutta.
Bhattacharya
D K
DK
Mandal
C
C
D000107:Acetylation; D002648:Child; D002675:Child, Preschool; D003124:Colorimetry; D004396:Coloring Agents; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D037102:Lectins; D008232:Lymphoproliferative Disorders / Q000175:diagnosis; D008297:Male; D019158:N-Acetylneuraminic Acid / Q000378:metabolism; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy*; D013778:Tetrazolium Salts; D013844:Thiazoles; D016896:Treatment Outcome
D004396:Coloring Agents; D037102:Lectins; D013778:Tetrazolium Salts; D013844:Thiazoles; C050704:achatinin(H); C022616:thiazolyl blue; D019158:N-Acetylneuraminic Acid