ترهالوز

One of the most challenging issues in food and pharmaceutical industries is finding effective and safe saccharides from natural sources instead of the synthetic counterparts which can have side effects. In this regard, Trehala manna is considered a promising natural source of sugar and produced by Echinopes in response to insect activity.

The highest percentage of protein (2.97%), fat (0.87%), moisture (5.83%), fibre (0.83%) and ash (3.51%) was related to samples in Jahrom, and followed by Sabzevar, Mehriz, Jahrom, and Banaroyeh, in order of magnitude. Benaroyeh sample had the highest proportion of trehalose (17.11). However, Shiraz sample had the highest total sugar content (115 mg/g) and water-soluble sugar (45 mg/g) among the samples.The values of sucrose, glucose, fructose were ranged 2.4-8.2 (mg/gr), 7.6-4.5 (mg/gr) and 4.4-1.2 (mg/gr), respectively. In all cases, there were significant differences (p<0.05).

The origin of Trehala manna in different regions of Iran significantly affect their chemical components, especially trehalose. In this regard, Trehala mana from Benaroyeh region can be used as a proper source of trehalose (17.11%) for industrial purposes and the production of functional food.

Spermatogonial stem cells (SSCs) are the foundation of spermatogenesis, because they have the capacity of self-renewal, and differentiation into spermatozoa. Freezing is the most common long-term preservation approach for SSCs. The present study aimed to investigate the cryoprotective impacts of FBS (Fetal Bovine Serum) and trehalose on caprine SSCs.

SSCs were isolated from prepubertal goat testis by enzymatic digestion and differential plating. Cells were divided into 9 groups. The control group included SSCs without cryoprotective agents. In the treatment groups 1, 2, 3 and 4, concentration of 10% FBS, and various concentrations of trehalose (0, 50, 100 and 200 mM), and in the treatment groups 5, 6, 7, and 8, concentration of 20% FBS and various concentrations of trehalose (0, 50, 100 and 200 mM) were used respectively. The viability rate of the cells was assessed immediately after isolation, following addition of cryoprotectant agents and after thawing. Identification of cells was confirmed by immunocytochemical staining against PGP9.5 antigen. Data were analyzed using one-way ANOVA test.

The viability rate of SSCs in various treatments following addition of FBS and trehalose were similar to viable cells immediately after isolation. Furthermore, higher viability rates of SSCs after thawing were observed in freezing medium containing 10% FBS and 200 mM trehalose (P<0.05).

The results revealed that freezing in 10% FBS with 200 mM trehalose acts as efficient method for the cryopreservation of caprine SSCs.

  Freezing human semen is considered an effective technique in assisted reproductive techniques (ART). During cryopreservation, sperm cells are exposed to chemical and physical stress, resulting in damage to the axonum, increased morphological deficits in the middle segment, and decreased sperm motility. In this study, the effects of trehalose and resveratrol antioxidants on sperm parameters during freezing and thawing processes were evaluated.

A cross-sectional study was performed on 40 normal semen samples divided into 7 groups. The effects of these antioxidants on sperm parameters were investigated by computer analysis (CASA) and sperm chromatin (SCD) evaluation. It should be noted that P<0.05 was considered statistically significant.

Group 3 (freezing and treating with 100 mM trehalose) showed the highest percentage of motility, acrosome membrane integrity, and plasma membrane integrity compared to the control group and had healthier DNA after thawing and fewer survival of sperm.

According to the results, it can be concluded that trehalose samples in general improve the quality of semen and even after thawing it is involved in maintaining sperm motility. Resveratrol causes toxicity at high concentrations and causes undesirable changes in osmotic pressure, but at low concentrations it has beneficial effects on sperm survival and inhibits ROS as a potent antioxidant.

Oxidative stress is implicated in the pathogenesis of various diseases, including neurological disorders. In such stressful conditions, heat shock protein 70 (HSP70) protects cells, thus its pharmacological induction can be protective. The disaccharide trehalose exhibits various beneficial effects, including antioxidative effect. However, its impact on HSP70 is not obvious. This study was conducted to investigate the effect of trehalose on HSP70 gene expression in rat pheochromocytoma PC12 cells treated with hydrogen peroxide. PC12 cells were pretreated with trehalose (12.5, 25, 50 mM) for 24 hours, and then were treated with hydrogen peroxide (100 μM) for 24 hours. Cell viability was determined via MTT assay and HSP70 gene expression was measured using Real-time polymerase chain reaction. Trehalose pretreatment increased viability of PC12 cells exposed to hydrogen peroxide in a dose dependent manner. Furthermore, HSP70 gene expression upregulated in cells that were pretreated with trehalose. The highest gene expression was at 50 mM trehalose. Current study showed that terhalose protects PC12 cells against hydrogen peroxide by increasing the expression of HSP70 gene.

The two main methods for obtaining microbial strains with specific characteristics for application in the industry are isolation from natural sources and using random mutagenesis. Characterization of all isolated strains is very time-consuming and expensive. In this study the tolerance of some strains of Saccharomyces cerevisiae to different stresses was measured and the association between these stresses and tolerance to osmotic pressure and production of intracellular trehalose determined, aiming at applying the results to designing selection media. The viability (percent cell survival) of different strains of Saccharomyces cerevisiae was assessed by exposure to a 3M Nacl solution, a 40% sorbitol solution, a freezing shock at -20º C, and a heat shock at 52º C. In addition, the intracellular accumulation of trehalose was determined by the antrone reagent. The associations between these factors and resistance of Saccharomyces cerevisiae strains were then determined using statistical tests. Strong correlations were observed between resistance to NaCl- and sorbitol-introduced stress and strains of Saccharomyces cerevisiae (p<0.01). There was also a strong association between intracellular trehalose accumulation and resistance to heat shock (p<0.01). While sugars can not select osmotolerant cells, Nacl is a very strong selector for more specific isolation of more resistant cells in a suspension. Similarly, heat shock stress is very efficient in selecting cells with a higher intracellular trehalose accumulation in a suspension.