In vivo and in vitro stimulatory effect of a gonadotropin-releasing hormone analog (HOE 766) on spermatogonial multiplication in the frog, Rana esculenta.
Publication Date: 01/08/1986, on Endocrinology
by Minucci S, Di Matteo L, Pierantoni R, Varriale B, Rastogi RK, Chieffi G
The effects of a GnRH analog (GnRHA), D-Ser-t-Bu6,desGly-NH2(10) (HOE 766) on spermatogenesis were analyzed in the frog, Rana esculenta. Intact animals caught at two different periods of the year (January and March) were treated with HOE 766 (GnRHA, 45 ng/g BW) at low (4 +/- 1 C) and high (22 +/- 2 C) temperatures. Hypophysectomized frogs were used also and, in addition to GnRHA, these animals were treated with crude pars distalis homogenate. In vitro incubations were carried out at 15 C, for 0, 6, and 24 h with the addition of 1 microgram GnRHA. Half of each testis was used as the untreated control. Histological sections of the testes were analyzed for the evaluation of the mitotic index of the primary spermatogonia. Intact March animals had mitotic indices higher than January animals. GnRHA treatment elicited an increase of the mitotic index in both intact and hypophysectomized animals. High temperature potentiated the GnRHA effect while low temperature favored pars distalis treatment. In conclusion, the present results are consistent with the fact that in the frog, R. esculenta, the magnitude of spermatogonial proliferation is temperature dependent, and for the first time it is shown that GnRH-like substances have direct stimulatory effect on the mitotic activity of the primary spermatogonia in a vertebrate.
[Unusual histo-cytopathologic findings in a familial case of stiff spine syndrome].
Publication Date: 01/08/1986, on Acta neurologica
by Di iorio G, Lus G, De Cristofaro M, Cutillo C, Cecio A, Corona M, Guastafierro VF, Cotrufo R
Complexity of nuclear and polysomal RNA from squid optic lobe and gill.
Publication Date: 01/05/1986, on Journal of neurochemistry
by Capano CP, Gioio AE, Giuditta A, Kaplan BB
The sequence complexity of nuclear and polysomal RNA from squid optic lobe and gill was measured by RNA-driven hybridization reactions with single-copy [3H]DNA. At saturation, brain nuclear and polysomal RNAs were complementary to 22.8 and 7.9% of the DNA probe, respectively. Assuming asymmetric transcription, the complexity of nuclear and polysomal RNA was equivalent to 2.5 X 10(8) and 8.8 X 10(7) nucleotides, respectively. Approximately 80-85% of the sequence complexity of brain total polysomal RNA was found in the polyadenylated RNA fraction. In contrast to these findings, nuclear and polysomal RNAs from gill hybridized to 9.1 and 2.9%, respectively, of the single-copy DNA, values that were 2.5-fold lower than those obtained in the CNS. Taken together, the results focus attention on the striking diversity of gene expression in the squid CNS and extend to the cephalopod mollusks the observation that nervous tissue expresses significantly more genetic information than other somatic tissues or organs.
Plasma sex hormone profile in Gentile di Puglia ewes during the estrus cycle.
Publication Date: 01/02/1986, on Journal of endocrinological investigation
by Dell'Aquila S, Varriale B, Alberico G, Crasto A, Pelosi A, Pierantoni R
The profiles of estradiol (E2), progesterone (P), and androstenedione (A), have been studied for the first time in cyclic Gentile di Puglia ewes. Estradiol peaks at estrus whereas progesterone levels are high during the luteal phase. Androstenedione does not show meaningful cyclic fluctuation. All hormones examined show also a pulsatile pattern when plasma was collected hourly.
Seasonal plasma profiles of testosterone and androstenedione in the Gentile di Puglia ram in southern Italy.
Publication Date: 01/06/1985, on Journal of endocrinological investigation
by Dell'Aquila S, Crasto A, Alberico G, Varriale B, Pelosi A, Pierantoni R
Seasonal plasma testosterone and androstenedione levels were determined by radioimmunoassay in the Gentile di Puglia ram. Androstenedione remains steady throughout the years, while testosterone shows seasonal changes. Testosterone is at high levels in winter, spring and summer and drops to a low concentration in autumn.
Isolation and characterization of dipeptidyl peptidase IV from human meconium. Functional role of beta-casomorphins.
Publication Date: 20/05/1985, on FEBS letters
by Caporale C, Fontanella A, Petrilli P, Pucci P, Molinaro MF, Picone D, Auricchio S
Dipeptidyl aminopeptidase IV (DAP-IV) (EC 184.108.40.206) was purified from meconium particles sedimenting at 105 000 X g. Its molecular properties and activity on synthetic and natural substrates (casomorphin and procasomorphin) were investigated.
Effect of temperature and darkness on testosterone concentration in the testes of intact frogs (Rana esculenta) treated with gonadotrophin-releasing hormone analog (HOE 766).
Publication Date: 01/04/1985, on General and comparative endocrinology
by Pierantoni R, Minucci S, Di Matteo L, Fasano S, Varriale B, Chieffi G
Testicular testosterone was determined by radioimmunoassay in the frog (Rana esculenta) kept in total darkness, at a high or a low temperature (24 or 4 degrees C), and treated with a gonadotrophin-releasing hormone analog (GnRHa, HOE 766). Prolonged exposure to dark conditions seemed to inhibit hypotalamic functions. Moreover, it is shown that high temperature interacts positively with GnRHa treatment on testicular testosterone concentration.
Stimulatory effect of a GnRH agonist (buserelin) in in vitro and in vivo testosterone production by the frog (Rana esculenta) testis.
Publication Date: 01/12/1984, on Molecular and cellular endocrinology
by Pierantoni R, Fasano S, Di Matteo L, Minucci S, Varriale B, Chieffi G
The summary testicular effects of an agonistic analogue of gonadotropin-releasing hormone (buserelin, GnRHa) have been studied in vitro and in vivo in the frog, Rana esculenta. During 3 h incubation GnRHa (8 X 10(-7) M) potentiated pituitary factors in stimulating testosterone production by minced testes in vitro. After 6 h of incubation 8 X 10(-7) M GnRHa stimulated maximal testosterone output. Testes of 10-day hypophysectomized animals did not show any GnRHa effect in vitro. In vivo, a direct effect of GnRHa on testicular testosterone production was demonstrated in hypophysectomized animals, although this effect was temperature-dependent, requiring the frog to be maintained at a high temperature (24 degrees C). No effect of GnRHa was detectable in frogs kept at a low temperature (4 degrees C).
Origin of axoplasmic RNA in the squid giant fiber.
Publication Date: 01/12/1983, on Neurochemical research
by Cutillo V, Montagnese P, Gremo F, Casola L, Giuditta A
The origin of axoplasmic RNA in the squid giant fiber was investigated after exposure of the giant axon or of the giant fiber lobe to [3H]uridine. The occurrence of a local process of synthesis was indicated by the accumulation of labeled axoplasmic RNA in isolated axons incubated with the radioactive precursor. Similar results were obtained in vivo after injection of [3H]uridine near the stellate nerve at a sizable distance from the ganglion. Exposure of the giant fiber lobe to [3H]uridine under in vivo and in vitro conditions was followed by the appearance of labeled RNA in the axoplasm and in the axonal sheath. While the latter process is attributed to incorporation of precursor by sheath cells, a sizable fraction of the radioactive RNA accumulating in the axoplasmic is likely to originate from neuronal perikarya by a process of axonal transport.
Brain protein and DNA synthesis during seizures.
Publication Date: 01/01/1983, on Advances in neurology
by Giuditta A, Metafora S, Popoli M, Perrone-Capano C
Clinical and computerized tomographic study of a case of Schilder's disease.
Publication Date: 01/02/1982, on Acta neurologica
by Barbieri F, Filla A, Grossi D, Orefice G, Perretti A, Cirillo S, Buscaino GA
DNA turnover in rat cerebral cortex.
Publication Date: 01/01/1982, on Journal of neurochemistry
by Perrone-Capano C, D'Onofrio G, Giuditta A
After the intracranial injection of [methyl-3H]thymidine the specific activity of rat cortical DNA increases rapidly, reaching a maximum at about 5 h. More than half of the radioactive DNA disappears from the tissue in the following few hours. During the same period of time the concentration of radioactive DNA in liver remains essentially constant. Minor variations occur in both organs after 41 h. An apparent rapid turnover of DNA is also present in a fraction of purified neuronal perikarya prepared from the cerebral cortex.
[L-dopa-resistant parkinsonism with cerebral atrophy: striato-nigral degeneration? 2 cases].
Publication Date: 01/02/1981, on Acta neurologica
by Dell'Aria V, Ciannella L, Melone MA
[L-dopa-resistant Parkinson's disease with cerebral atrophy: striato-nigral degeneration?].
Publication Date: 01/01/1981, on Acta neurologica. Quaderni
by Dell'Aria V, Ciannella L, Melone MA
[Some aspects of hysteria: a clinical study].
Publication Date: 01/01/1979, on Acta neurologica. Quaderni
by Brandonisio A, Melone MA, Valiani R