The effect of carbamazepine on sperm counts in Wistar rats--reflecting upon its mitogenic potential

The present study was aimed to investigate the effects of carbamazepine, an antiepileptic drug, on sperm count in rats. Male Wistar rats were treated with carbamazepine at doses of 9, 18, and 36 mg/kg for five consecutive days. Following the last exposure, on days 14 and 35, spermatozoa were collected from epididymis and counted. On day 14, carbamazepine treatment decreased the sperm number in a dose dependent pattern. On day 35, 9 mg/kg and 36 mg/kg of carbamazepine increased the sperm number in comparison with untreated rats. The results of the study suggest that carbamazepine is a germ cell mitogen.     

The effect of gabapentin and phenytoin on sperm-morphology in Wistar rats

The objective of the present study was to investigate the effects of the antiepileptic drugs, gabapentin and phenytoin, on sperm morphology in Wistar rats. Groups (n=5) of rats were treated with cyclophosphamide (20 mg/day), gabapentin (16, 25, 32 mg/day) and phenytoin (3.5, 5.5, 7 mg/day) for five consecutive days. 14 and 35 days after the last exposure, sperm morphology was evaluated by standard procedure. Gabapentin and phenytoin did not induce significant changes in sperm morphology. The results suggest that phenytoin and gabapentin are not germ cell mutagens in males, and do not appear to adversely affect male fertility.     

Biosynthetic origin of the gem-methyls of geraniol

Degradation of geraniol (3,7-dimethylocta-trans-2,6-dien-1-ol) biosynthesized in Rosa dilecta has proved that C-10 is exclusively derived from C-2 of mevalonate. This verifies the generally accepted but hitherto unproven view of the origin of the gem-methyls in this compound and of the corresponding groups in other terpenoids.     

Ero1L, a thiol oxidase, is required for Notch signaling through cysteine bridge formation of the Lin12-Notch repeats in Drosophila melanogaster

Notch-mediated cell–cell communication regulates numerous developmental processes and cell fate decisions. Through a mosaic genetic screen in Drosophila melanogaster, we identified a role in Notch signaling for a conserved thiol oxidase, endoplasmic reticulum (ER) oxidoreductin 1–like (Ero1L). Although Ero1L is reported to play a widespread role in protein folding in yeast, in flies Ero1L mutant clones show specific defects in lateral inhibition and inductive signaling, two characteristic processes regulated by Notch signaling. Ero1L mutant cells accumulate high levels of Notch protein in the ER and induce the unfolded protein response, suggesting that Notch is misfolded and fails to be exported from the ER. Biochemical assays demonstrate that Ero1L is required for formation of disulfide bonds of three Lin12-Notch repeats (LNRs) present in the extracellular domain of Notch. These LNRs are unique to the Notch family of proteins. Therefore, we have uncovered an unexpected requirement for Ero1L in the maturation of the Notch receptor.     

Enzymatic modification of cassava starch by bacterial lipase

Enzymatic modification of starch using long chain fatty acid makes it thermoplastic suitable for a myriad of industrial applications. An industrial lipase preparation produced by Burkholderia cepacia (lipase PS) was used for modification of cassava starch with two acyl donors, lauric acid and palmitic acid. Reactions performed with palmitic acid by liquid-state and microwave esterification gave a degree of substitution (DS) of 62.08% (DS 1.45) and 42.06% (DS 0.98), respectively. Thermogravimetric analysis showed that onset of decomposition is at a higher temperature (above 600°C) for modified starch than the unmodified starch (280°C). Modified starch showed reduction in α-amylase digestibility compared to native starch (76.5–18%). Swelling power lowered for modified starch as esterification renders starch more hydrophobic, making it suitable for biomedical applications as materials for bone fixation and replacements, carriers for controlled release of drugs and bioactive agents. Thus enzymatic esterification is ecofriendly.