The Journey of iPSC-derived OPCs in Demyelinating Disorders: From In vitro Generation to In vivo Transplantation.

Loss of myelination is common among neurological diseases. It causes significant disability, even death, if it is not treated instantly. Different mechanisms involve the pathophysiology of demyelinating diseases, such as genetic background, infectious, and autoimmune inflammation. Recently, regenerative medicine and stem cell therapy have shown to be promising for the treatment of demyelinating disorders. Stem cells, including embryonic stem cells (ESCs), induced pluripotent stem cells (iPSCs), and adult stem cells (ASCs), can differentiate into oligodendrocyte progenitor cells (OPCs), which may convert to oligodendrocytes (OLs) and recover myelination. IPSCs provide an endless source for OPCs generation. However, the restricted capacity of proliferation, differentiation, migration, and myelination of iPSC-derived OPCs is a notable gap for future studies. In this article, we have first reviewed stem cell therapy in demyelinating diseases. Secondly, methods of different protocols have been discussed among in vitro and in vivo studies on iPSC-derived OPCs to contrast OPCs' transplantation efficacy. Lastly, we have reviewed the results of iPSCs-derived OLs production in each demyelination model.

Do we miss rare adverse events induced by COVID-19 vaccination?

Although severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has caused many complications, the invention of coronavirus disease 2019 (COVID-19) vaccines has also brought about several adverse events, from common side effects to unexpected and rare ones. Common vaccine-related adverse reactions manifest locally or systematically following any vaccine, including COVID-19 vaccines. Specific side effects, known as adverse events of particular interest (AESI), are unusual and need more evaluation. Here, we discuss some of the most critical rare adverse events of COVID-19 vaccines.

Association between social support and pregnancy stress: a cross-sectional study of neighbors' interactions.

BACKGROUND: Pregnancy is associated with substantial stressful experiences. There are controversies concerning the positive and negative roles of social support during pregnancy. This research aimed to study the association of social support with the pregnancy-related stress. METHODS: In the current cross-sectional research, 200 pregnant women were recruited through convenience sampling from two teaching hospitals affiliated with Babol University of Medical Sciences and a private obstetric clinic. The women completed two self-reported questionnaires during prenatal care appointments. The questionnaires included the Revised Prenatal Distress Questionnaire (NuPDQ) and Social Support Questionnaire (SSQ). RESULTS: A significantly positive association was observed between the social support of neighbors and the total score of pregnancy stress (P<0.001), as well as the scores of its four subscales, namely medical problems (P<0.001), parenting (P=0.25), infant health stress (P=0.006), and pregnancy symptoms (P=0.001). Based on the linear regression models, the social support of neighbors was significantly related to the medical problem-associated stress in pregnant women (ß = 0.147, 95% CI: 0.14 to 0.62, p = 0.047), pregnancy symptom (ß = 0.203, 95% CI: -0.01 to 0.327, p = 0.017), and fear of childbirth (ß = 0.164, 95% CI: 0.05 to 0.38, p = 0.046). Furthermore, the neighbors' social support (ß = 0.172, 95% CI: 0.02 to 0.32, p = 0.04) and the total score of social support (ß = 0.155, 95% CI: 0.01 to 0.304, p = 0.046) were significantly associated with the total score of pregnancy stress. CONCLUSIONS: Neighbors' support, as a component of social support, was found to be significantly related to pregnancy stress. This study recommends that healthcare providers consider the positive and negative impacts of social support during the pregnancy period.

Stem Cell-based Therapeutic and Diagnostic Approaches in Alzheimer's Disease.

BACKGROUND: Alzheimer's disease (AD) is a neurodegenerative impairment mainly recognized by memory loss and cognitive deficits. However, the current therapies against AD are mostly limited to palliative medications, prompting researchers to investigate more efficient therapeutic approaches for AD, such as stem cell therapy. Recent evidence has proposed that extensive neuronal and synaptic loss and altered adult neurogenesis, which is perceived pivotal in terms of plasticity and network maintenance, occurs early in the course of AD, which exacerbates neuronal vulnerability to AD. Thus, regeneration and replenishing the depleted neuronal networks by strengthening the endogenous repair mechanisms or exogenous stem cells and their cargoes is a rational therapeutic approach. Currently, several stem cell-based therapies as well as stem cell products like exosomes, have shown promising results in the early diagnosis of AD. OBJECTIVE: This review begins with a comparison between AD and normal aging pathophysiology and a discussion on open questions in the field. Next, summarizing the current stem cell-based therapeutic and diagnostic approaches, we declare the advantages and disadvantages of each method. Also, we comprehensively evaluate the human clinical trials of stem cell therapies for AD. METHODOLOGY: Peer-reviewed reports were extracted through Embase, PubMed, and Google Scholar until 2021. RESULTS: With several ongoing clinical trials, stem cells and their derivatives (e.g., exosomes) are an emerging and encouraging field in diagnosing and treating neurodegenerative diseases. Although stem cell therapies have been successful in animal models, numerous clinical trials in AD patients have yielded unpromising results, which we will further discuss.