Gestational diabetes mellitus (GDM) results from an interaction between susceptibility genes and the diabetogenic effects of pregnancy. During pregnancy, mice heterozygous for the lepin receptor (db/+) gain more weight, are glucose intolerant, and produce macrosomic fetuses compared with wild-type (+/+) mothers, suggesting that an alteration in leptin action may play a role in GDM and fetal overgrowth. To investigate whether leptin administration or pair-feeding can reduce adiposity and thereby prevent GDM and neonatal overgrowth, we examined energy balance, glucose and insulin tolerance, and fetal growth in pregnant db/+ and +/+ mice treated with recombinant human leptin-IgG during late pregnancy. Leptin reduced food intake and adiposity in pregnant db/+ mice to levels similar to pregnant +/+ mice and significantly reduced maternal weight gain. Maternal glucose levels were markedly lower during glucose and insulin challenge tests in leptin-treated db/+ mice relative to db/+ and pair-fed controls. Despite reduced energy intake and improved glucose tolerance, leptin administration did not reduce fetal overgrowth in offspring from db/+ mothers. Fetal and placental leptin levels were 1.3- to 1.5-fold higher in offspring from db/+ mothers and remained unchanged with leptin administration, whereas leptin treatment in +/+ mothers or pair-feeding decreased placental leptin concentration and reduced fetal birth weight. Our results provide evidence that leptin administration during late gestation can reduce adiposity and improve glucose tolerance in the db/+ mouse model of spontaneous GDM. However, fetal and placenta leptin levels are higher in db/+ mothers and are subject to reduced negative feedback in response to leptin treatment. These data suggest that alterations in placenta leptin may contribute to the regulation of fetal growth independently of maternal glucose levels.

Traditional medicine (TM) plays a significant role in healthcare either as part of the primary healthcare system or as an adjunct to conventional medicine. This study aimed to map systematic reviews (SRs) of TM modalities across health conditions and identify gaps in the research literature to facilitate priority setting in future TM research. We searched 17 databases from January 2018 to December 2022. Reviewers in pairs independently performed the database search, screened each record for inclusion, extracted data, and performed quality assessments using the AMSTAR 2 - A Measurement Tool to Assess systematic Reviews. To be included in this evidence map, the studies had to be SRs of clinical studies that evaluated the effectiveness of a TM modalities. The included SRs were analyzed according to TM modality, ICD-11 disease classification, and health outcomes, and visualized using graphical plots. We retrieved 241,509 records. After excluding duplicate records, 181,616 titles and abstracts were screened and 20,856 records were selected for full-text assessment, of which 18,137 records were further excluded. The final 2719 included SRs were primarily in adults (2591) with only 128 SRs in the pediatric population. The most commonly evaluated health conditions were diseases of the digestive system, circulatory system, and genitourinary system, with herbal medicine (n = 1867) and acupuncture (n = 471) being the most investigated TM modalities in treating these illnesses. Based on AMSTAR 2 criteria, the methodology quality of the included SRs is considerably low. This evidence map provides a comprehensive overview of the extent and nature of the available research onTM modalities across health conditions. It provides an initial step towards characterizing the global evidence base and outlining gaps in the existing evidence. We regard this study as laying the basis for future research of TM modalities. The protocol of this map is registered in PROSPERO (CRD42023416355).

The relationship between health literacy of Japanese people, their attitudes toward acupuncture, and their behavior in choosing this therapy is currently unclear. Therefore, for this study, we conducted a web-based survey to address this unknown relationship. A questionnaire comprising four categories (health status, health literacy, previous acupuncture experience, and attitudes toward acupuncture) was administered to 1,600 Japanese participants. For this study, we performed cross-tabulation and path analysis to examine the relationship between each questionnaire item. The mean score of participants’ health literacy was 3.41 (SD = 0.74), and older, educated, female participants tended to have higher health literacy. The respondents perceived acupuncture to be effective for chronic low back pain, tension-type headache, and knee pain due to osteoarthritis (40.0%, 38.7%, and 21.8%, respectively). Contrastingly, acupuncture was perceived as far less effective for postoperative nausea/vomiting and prostatitis symptoms (8.3% and 8.7%, respectively). Of the total study respondents, 34.4% reported that they would try acupuncture only if recommended by clinical practice guidelines, and 35.6% agreed that acupuncture is safe. The path analysis showed that attitudes toward acupuncture were significantly influenced by the participants’ health literacy, number of information sources, and previous acupuncture experience. However, it was also found that experience with acupuncture was not directly associated with health literacy. Although the Japanese population with higher health literacy is more likely to perceive acupuncture positively, they do not necessarily have sufficient relevant knowledge of the clinical evidence. Therefore, their decision to receive acupuncture may be more dependent on personal narratives rather than clinical evidence. Thus, future challenges lie in individual education of the population on how to choose a reliable health information source, and organizational efforts to provide more reliable health information.

Background: More new randomized controlled trials (RCTs) on acupuncture have been published in Japan since our last updated systematic review (2010). This systematic review aimed to evaluate the quality of RCTs on acupuncture conducted in Japan and understand the decade-wise changes in the methodological characteristics of the relevant RCTs. Methods: The literature search was performed using Ichushi Web, the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed and our team’s compilation of relevant papers. We included full-length papers reporting RCTs that examined the clinical effects of acupuncture on patients in Japan published in or before 2019. We assessed the risk of bias (RoB), sample size, control setting, negative trial reporting, informed consent, ethics approval, trial registration, and adverse event reporting. Results: A total of 99 articles reporting 108 eligible RCTs were identified. The number of RCTs published in each decade was 1, 6, 9, 5, 40, and 47 in the 1960s, 1970s, 1980s, 1990s, 2000s, and 2010s, respectively. Quality assessment using the Cochrane RoB tool revealed that “sequence generation” improved in and after 1990 (73%–80% of RCTs were rated as “low”) and “blinding of outcome assessors” slightly improved in and after the 2000s (40%–50% judged as “low”). However, “high” or “unclear” remained the dominant grades in other domains. Clinical trial registration and adverse events were reported only in 9% and 28% of the included RCTs even in the 2010s, respectively. A different acupuncture method or different point selection (e.g., deep vs. shallow insertion) was the most dominant control setting before 1990, while sham (or “placebo”) needling and/or sham acupoints became the most dominant in the 2000s. The proportion of RCTs with positive results was 80% in the 2000s and 69% in the 2010s. Conclusions: The quality of RCTs on acupuncture conducted in Japan did not appear to have improved over the decades except for “sequence generation.” While the culture of submitting negative trial reports was prevalent in the Japanese acupuncture research milieu as late as the 1990s, the overall quality of the relevant trials needs to be further improved.

The quality of clinical practice guidelines (CPGs) should be extensively evaluated. This study aimed to evaluate Japanese CPGs that include recommendations for acupuncture. In a literature search, CPGs including recommendations for acupuncture published in Japan until October 2021 were sought. We assessed (1) whether the CPGs were developed in accordance with the Grading Recommendations Assessment, Development and Evaluation (GRADE) system, (2) the quality of the CPGs using the Appraisal of Guidelines for Research and Evaluation (AGREE) II, and (3) whether the strength of the recommendations for acupuncture was consistent with each CPG's predefined procedure. Seventeen CPGs including 23 recommendations in total were identified and assessed. (1) Three CPGs were in accordance with the GRADE system. (2) The mean score of overall assessment using AGREE II was 4.5 on a 7-point Likert scale. The mean domain scores were 77% for domain 1 (scope and purpose), 54% for domain 2 (stakeholder involvement), 48% for domain 3 (rigor of development), 78% for domain 4 (clarity of presentation), 20% for domain 5 (applicability), and 51% for domain 6 (editorial independence). (3) The strength of the recommendations for acupuncture in two CPGs was judged to be underestimated. Some of the CPGs contained elementary problems that were not considered in AGREE II. The methodological quality of Japanese CPGs including recommendations for acupuncture was not necessarily high. Since technical issues exist in each field of therapy, the respective experts should be involved in developing and reviewing CPGs to disseminate accurate health information.

Japanese acupuncture and moxibustion (AM) originated in ancient China; however, it gradually became unique to Japan. Regarding the education of acupuncturists/moxibustionists (AMists), ancient Chinese classical theory is reverenced; however, the content being taught largely incorporates modern Western medicine. In this study, we focused on the current school curriculum, national examinations, postgraduate education, and certification systems for physicians and nonphysician AMists. In Japan, only physicians, dentists, or AMists are licensed to practice AM; however, AM has recently been mostly practiced by nonphysician AMists. Medical students are only slightly exposed to AM in their undergraduate curricula; therefore, only a few physicians practice AM. Notably, some universities or public hospitals offer postgraduate education on AM; however, the system has been insufficiently available to both physicians and AMists. Each society has a certification system for physicians and AMists to be recognized as Kampo (Japanese traditional medicine that is primarily a herbal medicine-based treatment) specialists and certified AMists, respectively; however, there is no AM certification system for physicians. Therefore, enhancing undergraduate and postgraduate education for medical AM practitioners is a future challenge.