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1

Choroid epithelial cells: source cerebrospinal fluid progesterone in sheep?

100%
Karahan S., Yarim G. F., Yarim M.
Medycyna Weterynaryjna
|
2007
|
tom 63
|
nr 08
935-937
The present study was conducted to immunolocalize 3b-hydroxysteroid dehydrogenase (3β-HSD), an enzyme metabolizing pregnenolone to progesterone in the choroid plexus of the lateral ventricle in sheep, as well as to measure progesterone concentration in cerebrospinal fluid (CSF) and plasma using radioimmunoassay (RIA). Akkaraman breed rams (n = 16) and ewes (n = 16) were utilized in the study. 3β-HSD was immunolocalized in choroid epithelial cells of the choroid plexus with an apparent cytoplasmic immunoreactivity. Progesterone was detected in CSF with no significant differences between the ewes (0.76 ± 0.14 ng/mL) and rams (0.74 ± 0.13 ng/mL) (p > 0.05). However, the plasma progesterone concentration in the ewes (0.27 ± 0.04 ng/mL) was significantly higher than that of the rams (0.11 ± 0.02 ng/mL) (p < 0.001). Consequently, CSF in sheep contains progesterone in significant levels. As evidenced by 3β-HSD immunoreactivity, choroid epithelial cells may be a site of progesterone synthesis in sheep.
2

High epidermal growth factor concentration associated with somatic cell count in milk of cows with subclinical mastitis

100%
Gokceoglu A., Yarim F., Gultiken N., Yarim M.
Medycyna Weterynaryjna
|
2020
|
tom 76
|
nr 06
The aim this study was to determine the milk epidermal growth factor (EGF) concentration in cows with subclinical mastitis and its relationship with the somatic cell count (SCC). The animal material of this study was composed of 40 lactating cows aged 3-6 years. Subclinical mastitis was diagnosed using the California Mastitis Test and SCC in milk. The study group consisted of 20 cows with SCC > 200.000 cells/ml, and the control group comprised 20 cows with SCC < 200.000 cells/ml. EGF concentration in milk was determined using a bovine-specific enzyme-linked immunosorbent assay (ELISA) kit. The mean EGF concentration was 6.08 ± 2.91 ng/ml in the study group and 2.85 ± 1.87 ng/ml in the control group (P < 0.001). The results also indicated a significant correlation between SCC and EGF concentration in the study group (r = 0.965, P < 0.01). The findings of this study suggest that a milk EGF assay together with SCC could be useful for diagnosing mastitis as well as for monitoring udder health.
3

Cytochrome P450 aromatase expression in canine nervous tissue: an immunohistochemical study

100%
Karahan S., Yarim M., Harada N.
Polish Journal of Veterinary Sciences
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2008
|
tom 11
|
nr 4
347-352
The enzyme cytochrome P450 aromatase is responsible for conversion of androgens to estrogens. Estrogens have been implicated in neurophysiology and neuropathology. The present study investigated the presence of aromatase immunoreactivity in the temporal, parietal and occipital cortices, olfactory bulb, cerebellum, and choroid plexus of the normal dog. Aromatase immunoreactivity was localized exclusively in neurons in the cortices and olfactory bulb. Immunoreactivity was also present in a small number of astrocytes in the substantia alba of the cerebellum. In the cortical regions, immunoreactive neurons, morphologically identified as pyramidal cells, were found throughout Layer II down to Layer VI, but not all pyramidal neurons were immunoreactive. In the olfactory bulb, immunoreactive neurons were mainly observed in mitral cells and inner granular cell layers. In the cerebellum, immunoreactivity was present in neurons of the deep cerebellar nuclei and in some neurons of the molecular and granular cell layers. Immunoreactivity was also present in endothelial cells of the subarachnoid vessels and those adjacent to ventricles in the cortex. The presence of well defined cytoplasmic aromatase immunoreactivity in neurons, some astrocytes, and endothelial cells suggests estrogen involvement in CNS physiology and function in the dog. The presence of aromatase in ependymal cells lining cerebral ventricles and choroid epithelial cells suggests that these cells may be partially responsible for estrogen concentration in the cerebrospinal fluid.
4
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Investigation of diagnostic use of serum anti-Müllerian hormone concentration in dioestrus and anoestrus bitches before and after ovariohysterectomy and the relationship with ovarian follicle numbers

76%
Anadol E., Gultiken N., Yarim G. F., Karaca E., Kanca H., Yarim M.
Polish Journal of Veterinary Sciences
|
2020
|
tom 23
|
nr 3
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