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Comparison of plasma dipeptidyl peptidase IV activity in two caiman species: Caiman latirostris and Caiman yacare (Crocodylia, Alligatoridae)

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Dipeptidyl peptidase IV (DPPIV) is a well-characterized protease with broad substrate specificity, functionally-related to the activity of many bioactive peptides. It plays an important role as physiological regulator of a number of peptides that serve as biochemical messengers within the immune system. Plasma DPPIV activity was characterized with respect to temperature, kinetics and concentration dependence in two species of caiman, the broad-snouted caiman (Caiman latirostris) and the black yacare (Caiman yacare). DPPIV activity showed a significant positive correlation from titrations carried out in the presence of different plasma concentrations. DPPIV activity was lower in C. yacare than in C. latirostris at all temperatures tested. C. yacare DPPIV activity showed a significant increase only at higher temperatures whilst C. latirostris plasma demonstrated a strong positive correlation starting at the lowest temperature, probably due to an adaptation for the tolerance of lower temperatures. Exposure of C. latirostris and C. yacare plasma at different time points showed that plasma DPPIV activities were time-dependent, and that the titer-dependent curves were different for the two species. These results revealed that plasma DPPIV activities were different between these two crocodilian species, which could contribute to the differences in susceptibility to infection between them.

Affiliations: 1: Proyecto Yacaré, Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA), A. del Valle 8700, 3000 Santa Fe, Argentina, Secretaría de Estado de Medio Ambiente y Desarrollo Sustentable, 3000 Santa Fe, Argentina;, Email:; 2: Department of Chemistry, McNeese State University, Box 90455, Lake Charles, LA 70609, USA; 3: Proyecto Yacaré, Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA), A. del Valle 8700, 3000 Santa Fe, Argentina, Centro de Investigaciones Científicas y Transferencia de Tecnología a la Producción – CICyTTP – CONICET, 3105 Diamante, Entre Ríos, Argentina; 4: Proyecto Yacaré, Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA), A. del Valle 8700, 3000 Santa Fe, Argentina, Cátedra de Toxicología y Bioquímica Legal, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, 3000 Santa Fe; FCEyN, UBA – CONICET, C1428EGA Buenos Aires, Argentina; 5: Departamento de Ciencias Morfológicas, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral – CONICET, 3000 Santa Fe, Argentina


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