Immunoreactive parathyroid hormone and calcitonin in children's cerebrospinal fluid

Area of Science:

• Endocrinology
• Pediatric Oncology
• Neurochemistry

Background:

• Leukemia treatment involves maintenance chemotherapy, potentially affecting various physiological markers.
• Parathyroid hormone (PTH) and calcitonin are key endocrine regulators, but their presence in cerebrospinal fluid (CSF) is not well-established, particularly in pediatric patients undergoing chemotherapy.

Purpose of the Study:

• To investigate the presence and levels of immunoreactive parathyroid hormone (iPTH) and immunoreactive calcitonin (iCT) in the cerebrospinal fluid (CSF) of children with leukemia.
• To compare CSF hormone concentrations with serum levels and assess potential correlations.

Main Methods:

• Radioimmunoassay (RIA) was employed to quantify iPTH and iCT levels.
• Measurements were performed on both cerebrospinal fluid (CSF) and serum samples from 23 pediatric leukemia outpatients receiving maintenance chemotherapy.
• Statistical analysis was used to compare CSF and serum concentrations and evaluate correlations.

Main Results:

• Both iPTH and iCT were detectable in the CSF of all evaluated pediatric leukemia patients.
• Mean CSF iPTH levels were 148 +/- 11 pg/ml, and mean CSF iCT levels were 14.3 +/- 0.8 pg/ml.
• CSF hormone concentrations were significantly lower (p < 0.001) than corresponding serum levels (iPTH 396 +/- 18 pg/ml; iCT 32.3 +/- 1.4 pg/ml), with no significant correlation observed between the two compartments.

Conclusions:

• This study confirms the presence of immunoreactive parathyroid hormone (iPTH) and immunoreactive calcitonin (iCT) within the cerebrospinal fluid (CSF) of children undergoing maintenance chemotherapy for leukemia.
• The findings suggest that CSF hormone levels are distinct from serum levels in this patient population, indicating localized production or differential transport mechanisms.