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Biomedical subjects

A Lombardo

Publications and source records attributed to A Lombardo.

119 records · Page 7Linked to original sources
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Chronobiological study of several enzymes of lysosomal origin in human plasma.

The possible occurrence of circadian and circannual rhythms in the plasma concentrations of the following enzymes of lysosomal origin was assessed: beta-D-N-acetylglucosaminidase (EC 3.2.1.30) beta-D-glucuronidase (EC 3.2.1.31), beta-D-glucosidase (EC 3.2.1.21), beta-D-galactosidase (EC 3.2.1.22), alpha-D-galactosidase (EC 3.2.1.23), alpha-L-fucosidase (EC 3.2.1) and alpha-D-mannosidase (EC 3.2.1.24). The circadian rhythm was studied in 16 women (aged: 17-24 years) and 13 men (age: 23 years) volunteers; the circannual rhythm, in 10 women and 8 men (age: 20-25 years). The circadian rhythm was detected in all the tested enzymes of women, and only in alpha-D-galactosidase, beta-D-glucosidase, alpha-D-mannosidase and beta-D-acetylglucosaminidase of men. A statistically significant difference between genders in the circadian rhythm was exhibited by beta-D-galactosidase (MESOR; amplitude) beta-D-glucosidase (MESOR; amplitude; acrophase) beta-D-N-acetylglucosaminidase, beta-D-glucuronidase and alpha-D-galactosidase (MESOR) and alpha-L-fucosidase (amplitude, acrophase). A circannual rhythm was detected in all the tested enzymes with the exception of beta-D-glucuronidase and beta-D-N-acetylglucosaminidase; no statistically significant difference between genders was detected. The group rhythms of some of the enzymes (alpha-D-galactosidase, beta-D-glucosidase, beta-D-galactosidase) showed similar values of both circadian and circannual acrophases, suggesting that they may subjected as a group to the same chronobiological coordination, possibly mediated by hormones. The chronobiological rhythms of lysosomal enzymes were different from those of lactate dehydrogenase and alpha 1-antitrypsin, indicating that these rhythms are not merely reflecting fluctuations of the water content of plasma. No in-phase relationship was observed between the circadian and circannual rhythms of plasma cortisol and those of the tested lysosomal enzymes, excluding a direct chronobiological and possibly functional relationship between this hormone and lysosomal enzymes.

Adult↗
PubMedDate not supplied

Clinical value of radiolabeled monoclonal antibodies in the management of carcinoma patients.

A significant number of monoclonal antibodies, suitable for in vivo management of carcinoma patients, have been recently developed and evaluated in clinical trials. They can be used successfully either for imaging or for radioimmunotherapy, although their clinical application shows advantages and limitations. With the advent of genetic engineering, it has become feasible to design molecules (i.e. chimeric and humanized antibodies, single-chain) to circumvent drawbacks or enhance a certain property. Several radionuclides can actually be used to be linked to monoclonal antibodies, including radiometallic isotopes which need bifunctional chelators. Coupling these radiometals to proteins will greatly increase diagnostic and therapeutic possibilities. The ability of radiolabeled monoclonal antibodies to localize tumors, markedly contributed to the development of a new intraoperative approach termed "Radioimmunoguided Surgery". This system, being used to better define tumor margin resection as well as occult tumor sites, is of importance in postoperative decision-making. Optimization of this technique is actually under evaluation at our Institution, especially in combination with Biological Response Modifiers.

Adult↗