Abstract
T/Tn specificity of Artocarpus lakoocha agglutinin (ALA), isolated from the seeds of A. lakoocha (Moraceae) fruit and a heterodimer (16 kD and 12 kD) of molecular mass 28 kD, was further confirmed by SPR analysis using T/Tn glycan containing mammalian glycoproteins. N-terminal amino acid sequence analysis of ALA showed homology at 15, 19–21, 24–27, and 29 residues with other lectin members of Moraceae family viz., Artocarpus integrifolia (jacalin) lectin, Artocarpus hirsuta lectin, and Maclura pomifera agglutinin. It is mitogenic to human PBMC and the maximum proliferation was observed at 1 ng/ml. It showed an antiproliferative effect on leukemic cells, with the highest effect toward Jurkat cells (IC50 13.15 ng/ml). Synthesized CdS quantum dot-ALA nanoconjugate was employed to detect the expression of T/Tn glycans on Jurkat, U937, and K562 leukemic cells surfaces as well as normal lymphocytes by fluorescence microscopy. No green fluorescence was observed with normal lymphocytes indicating that T/Tn determinants, which are recognized as human tumor associated structures were cryptic on normal lymphocyte surfaces, whereas intense green fluorescent dots appeared during imaging of leukemic cells, where such determinants were present in unmasked form. The above results indicated that QD-ALA nanoconjugate is an efficient fluorescent marker for identification of leukemic cell lines that gives rise to high quality images.
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Abbreviations
- ALA:
-
Artocarpus lakoocha agglutinin
- BSM:
-
Bovine submandibular gland mucin
- CdS:
-
Cadmium sulphide
- ELLSA:
-
Enzyme - linked lectinsorbent assay
- ESI-MS:
-
Electron spray ionization mass spectrometry
- FPLC:
-
Fast protein liquid chromatography
- HBS:
-
Hepes buffered saline
- HEPES:
-
N-(2-hydoxyethyl) piperizine-N′-(2-hydroxypropane sulfonic acid)
- HSM:
-
Hamster submaxillary mucin
- PBMC:
-
Peripheral blood mononuclear cells
- PVDF:
-
Polyvinylidene difluoride
- Q-ToF:
-
Quadrupole-time of flight
- QD:
-
Quantum dot
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- 2 ME:
-
2-Mercaptoethanol
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Acknowledgements
We sincerely thank Dr. Sujata Sharma of Department of Biophysics, All India Institutes of Medical Sciences, New Delhi for performing amino acid sequence analysis. The assistance of Dr. Syamal Roy of Indian Institute of Chemical Biology, Kolkata and Mr. Gautam Mondal of West Bengal University of Technology, Kolkata is gratefully acknowledged. This study was financially supported by a research grant (BT/PR4462/BRB/10/1350/2003) of the Department of Biotechnology, Government of India, New Delhi to B.P.C.
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Chatterjee, U., Bose, P.P., Dey, S. et al. Antiproliferative effect of T/Tn specific Artocarpus lakoocha agglutinin (ALA) on human leukemic cells (Jurkat, U937, K562) and their imaging by QD-ALA nanoconjugate. Glycoconj J 25, 741–752 (2008). https://doi.org/10.1007/s10719-008-9134-8
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DOI: https://doi.org/10.1007/s10719-008-9134-8