Sunflower seed-derived bioactive peptides show antioxidant and anti-inflammatory activity: From in silico simulation to the animal model

The evolving field of food technology is increasingly dedicated to developing functional foods. This study explored bioactive peptides from sunflower protein isolate (SPI), obtained from defatted flour, a by-product of the oil processing industry. SPI underwent simulated gastrointestinal digestion and the obtained peptide-enriched fraction (PEF) showed antioxidant properties in vivo, in zebrafish. Among the peptides present in PEF identified by mass spectrometry analysis, we selected those with antioxidant properties by in silico evaluation, considering their capability to interact with Keap1, key protein in the regulation of antioxidant response. The selected peptides were synthesized and evaluated in a cellular model. As a result, DVAMPVPK, VETGVIKPG, TTHTNPPPEAE, LTHPQHQQQGPSTG and PADVTPEEKPEV activated Keap1/Nrf2 pathway leading to Antioxidant Response Element-regulated enzymes upregulation. Since the crosstalk between Nrf2 and NF-κB is well known, the potential anti-inflammatory activity of the peptides was assessed and principally PADVTPEEKPEV showed good features both as antioxidant and anti-inflammatory molecule.

Shank3 deletion in PV neurons is associated with abnormal behaviors and neuronal functions that are rescued by increasing GABAergic signaling

BACKGROUND

Phelan-McDermid syndrome (PMS) is a neurodevelopmental disorder characterized by developmental delay, intellectual disability, and autistic-like behaviors and is primarily caused by haploinsufficiency of SHANK3 gene. Currently, there is no specific treatment for PMS, highlighting the need for a better understanding of SHANK3 functions and the underlying pathophysiological mechanisms in the brain. We hypothesize that SHANK3 haploinsufficiency may lead to alterations in the inhibitory system, which could be linked to the excitatory/inhibitory imbalance observed in models of autism spectrum disorder (ASD). Investigation of these neuropathological features may shed light on the pathogenesis of PMS and potential therapeutic interventions.

METHODS

We recorded local field potentials and visual evoked responses in the visual cortex of Shank3∆11-/- mice. Then, to understand the impact of Shank3 in inhibitory neurons, we generated Pv-cre+/- Shank3Fl/Wt conditional mice, in which Shank3 was deleted in parvalbumin-positive neurons. We characterized the phenotype of this murine model and we compared this phenotype before and after ganaxolone administration.

RESULTS

We found, in the primary visual cortex, an alteration of the gain control of Shank3 KO compared with Wt mice, indicating a deficit of inhibition on pyramidal neurons. This alteration was rescued after the potentiation of GABAA receptor activity by Midazolam. Behavioral analysis showed an impairment in grooming, memory, and motor coordination of Pv-cre+/- Shank3Fl/Wt compared with Pv-cre+/- Shank3Wt/Wt mice. These deficits were rescued with ganaxolone, a positive modulator of GABAA receptors. Furthermore, we demonstrated that treatment with ganaxolone also ameliorated evocative memory deficits and repetitive behavior of Shank3 KO mice.

LIMITATIONS

Despite the significant findings of our study, some limitations remain. Firstly, the neurobiological mechanisms underlying the link between Shank3 deletion in PV neurons and behavioral alterations need further investigation. Additionally, the impact of Shank3 on other classes of inhibitory neurons requires further exploration. Finally, the pharmacological activity of ganaxolone needs further characterization to improve our understanding of its potential therapeutic effects.

CONCLUSIONS

Our study provides evidence that Shank3 deletion leads to an alteration in inhibitory feedback on cortical pyramidal neurons, resulting in cortical hyperexcitability and ASD-like behavioral problems. Specifically, cell type-specific deletion of Shank3 in PV neurons was associated with these behavioral deficits. Our findings suggest that ganaxolone may be a potential pharmacological approach for treating PMS, as it was able to rescue the behavioral deficits in Shank3 KO mice. Overall, our study highlights the importance of investigating the role of inhibitory neurons and potential therapeutic interventions in neurodevelopmental disorders such as PMS.

High IgE levels in patients affected by psoriasis: review of the literature and personal observations

OBJECTIVE

The concomitance of psoriasis and high IgE levels in the same patient, possibly associated to allergies, should not come as a surprise anymore, because both diseases are characterised by an immunological disorder, involving cytokines and other inflammatory mediators, with massive activation of the cell-mediated immunity.

MATERIALS AND METHODS

During a period of 18 months, using a radio-immunologic method, we assessed the level of IgE in patients with severe psoriasis who were not responding to the common therapy.

RESULTS

Patients with severe psoriasis had high levels of IgE.

CONCLUSIONS

IgEs have an important role in pathogenesis of psoriasis and atopic dermatitis, but the mechanism is not yet clear.

Association between autoimmune disease and cutaneous melanoma with regard to melanoma prognosis

BACKGROUND

An association between autoimmune disease and malignant melanoma (MM) has often been reported in the literature as a positive prognostic factor for MM. Consequently, we evaluated the influence of different autoimmune diseases on the prognosis of MM.

AIM

To evaluate the prognosis of patients with MM who also had an autoimmune disorder, whether tumour-associated, paraneoplastic or drug-induced.

METHODS

Autoimmune diseases were classified and analysed as tumour-associated, paraneoplastic or drug-induced. Patients were enrolled according to their clinicopathological features and matched with control groups. Kaplan-Meier analysis was used to estimate disease-free survival (DFS) and overall survival (OS), and log-rank test was used to evaluate differences between the survival curves.

RESULTS

In total, 49 patients with MM and tumour-associated autoimmune disease were included in our analysis. No case of paraneoplastic autoimmune disease was detected. The survival analyses showed a range of results, from a worsening of DFS and OS to a lack of any difference. In a second analysis, we separately analysed patients who developed autoimmune disorders after starting adjuvant therapy with interferon-α; we did not find significant differences between these patients and the untreated patients.

CONCLUSIONS

Autoimmune disease, whether tumour-associated or drug-induced, was not associated with better prognosis in patients with MM. The results suggest that the reported relationship between autoimmunity and MM may be a result of individual variation in sensitivity to the autoimmune disease, the tumour or the treatments.

Chronic urticaria with high IgE levels: first results on oral cyclosporine A treatment

INTRODUCTION

Chronic Urticaria is a difficult to define condition from the nosographic standpoint, with complex pharmacological management, that heavily impacts the life of the patient. Some forms show not to be responsive to anti H1 anti-histaminic and require other treatments. One of these can be the treatment with Cyclosporine A (CsA).

MATERIALS AND METHODS

This study, open and sequential, reports the results of short-term treatment over a sample of adults (21 patients) of both sexes, all suffering from chronic urticaria with IgE levels higher than 200 mU/ml treated with 4 mg/kg/die of CsA.

RESULTS

The results obtained show a reduction in the levels of total IgE and a significant improvement in symptoms; there were no adverse effects.

CONCLUSIONS

Cyclosporine is an excellent treatment for chronic urticaria because it reduces the activity of T lymphocytes and reduction of the histamine release from the mast cells and basophils.

The effectiveness of oral goat colostrum in the treatment of patients with type 2 diabetes mellitus: our preliminary experience

INTRODUCTION

The properties of colostrum were recognized and investigated more thoroughly in the first half of the eighties, when the immune factors and growth factors it contains were pointed out. Numerous studies show that the administration of colostrum benefits the subjects with type 2 diabetes mellitus as it gradually regulates appetite, improves utilization of nutrients, especially glucose, and leads to a significant decrease in body fat.

MATERIALS AND METHODS

The following study is aimed at verifying a possible reduction in the use of insulin in 27 subjects with type 2 diabetes, treated with goat colostrum in the form gastro-resistant tablets of 300 mg (4/die).

RESULTS

In subjects with type 2 diabetes treated with insulin, the administration of colostrum has obtained a significant reduction of insulin dosage and normalization of blood glucose levels.

CONCLUSIONS

The effects of colostrum are presumably linked to increased levels of IGF-1 that improves the utilization of glucose, stimulates glycogen and protein synthesis.

Pregnancy in a woman with Turner syndrome and celiac disease

BACKGROUND

Studies on fertility in women with Turner syndrome have shown that spontaneous pregnancies occur in about 2-7% of patients. Fertility problems and obstetrical complications are frequently observed in untreated patients with celiac disease. We report the case of a patient, affected by Turner syndrome and celiac disease, in whom a spontaneous pregnancy occurred.

CASE

One patient affected by Turner syndrome at the age of 30 yr conceived spontaneously. Celiac disease was diagnosed during pregnancy. The pregnancy progressed uneventfully. After 39 weeks of gestation, she vaginally delivered a normal male infant.

CONCLUSION

Our patient had a successful pregnancy, giving birth to a healthy child, although she presented two pathological conditions affecting fertility and pregnancy outcome: Turner syndrome and celiac disease.