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1. Number of mast cells in the Harderian gland of the lizard Podarcis sicula sicula (Raf): the annual cycle and its relation to environmental factors and estradiol administration

Author

Paolo Chieffi, Loredana Di Matteo, Gabriella Chieffi Baccari, Antonietta Rusciani, Sergio Minucci, Italia Izzo Vitiello, Vitiello Izzo, I, Rusciani, A, Baccari, Gc, DI MATTEO, Loredana, Chieffi, Paolo, and Minucci, Sergio

Subjects
Male, medicine.medical_specialty, Photoperiod, Connective tissue, Cell Count, Environment, Harderian gland, Endocrinology, Internal medicine, biology.animal, medicine, Animals, Mast Cells, Mast (botany), Estradiol, biology, Harderian Gland, Lizard, Podarcis, Estrogen Antagonists, Temperature, Lizards, Annual cycle, biology.organism_classification, Mast cell, Tamoxifen, medicine.anatomical_structure, Female, Animal Science and Zoology, Seasons, Hormone
Abstract

The Harderian gland of the lizard Podarcis sicula sicula (Raf) contains connective tissue type mast cells whose numbers vary during the year showing two peaks, one in spring the other in winter. No sex differences are found throughout the year. Thermal and photoperiodic manipulations indicate that only temperature influences mast cell number (MCN) both in winter and in summer but not in spring. In animals exposed to high temperatures in February (but not in May) MCN declined, while exposure to low temperature in July had the opposite effect. Estradiol treatment of the February and April lizards increased MCN, an effect counteracted by the synthetic antiestrogen tamoxifen; in July lizards, this did not occur. In animals exposed to a high temperature in February, estradiol had no effect, as in animals exposed to low temperatures in July. These data suggest that in spring MCN seems to be more responsive to hormonal stimuli rather than external cues (temperature), while in summer MCN is more sensitive to temperature than to hormonal stimuli (estradiol). Both humoral and external factors are concluded to influence mast cell numbers in the Harderian gland of the lizard P. sicula sicula.

Published
1997

2. Mast cell-Leydig cell relationships in the testis of the lizard Podarcis s. sicula Raf: Thermal manipulation, ethane 1,2-dimethane sulphonate (EDS) and sex hormone treatment

Author

Loredana Di Matteo, C Marmorino, Italia Izzo Vitiello, Gabriella Chieffi Baccari, Sergio Minucci, Minucci, Sergio, VITIELLO IZZO, I, Marmorino, C, DI MATTEO, Loredana, and Chieffi, Gabriella

Subjects
Male, medicine.medical_specialty, Connective tissue, Reptile, Mast cell proliferation, Mast cell, chemistry.chemical_compound, Sex hormone-binding globulin, Leydig cell, Internal medicine, Testis, medicine, Animals, Testosterone, Mast Cells, Sex hormone, Cyproterone, Gonadal Steroid Hormones, Mesylates, biology, Estradiol, Podarcis, Estrogen Antagonists, Cyproterone acetate, Leydig Cells, Androgen Antagonists, Lizards, Cell Biology, biology.organism_classification, Androgen receptor, Tamoxifen, medicine.anatomical_structure, Endocrinology, chemistry, Testi, biology.protein, Seasons, Developmental Biology
Abstract

SummaryMast cells of connective tissue type are scattered in the interstitial compartment of the lizard Podarcis s. sicula. Their number varies during the year, showing peaks in spring and in winter, respectively.Thermal manipulation affects mast cell number (MCN): high temperature decreased MCN in both January and May, while low temperature increased MCN only in January. Ethane dimethane sulphonate, a toxin which specifically destroys Leydig cells, induced an increase in MCN on days 3 and 7 of treatment. Oestradiol treatment provoked a strong increase in MCN that was blocked by tamoxifen. Blocking androgen receptors with cyproterone acetate resulted in an increase in MCN, while testosterone injection provoked a strong decrease. These results suggest a relationship between the presence of mature Leydig cells and mast cell proliferation and/or differentiation.

Published
1995

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