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Barbering is a behavior which involves the plucking or nibbling of fur, hair, or whiskers (vibrissae), leading to focal hair loss, and is often seen in laboratory mice and rats. The role of this behavior, including its relationship with stress, aggression, grooming, and aberrant stereotypic behavior, is actively discussed. Insights into the nature of barbering and its impact on laboratory rodents should be considered when planning experimental studies. Here, we discuss recent data on the neurobiology and genetics of barbering, as well as its role in the behavior and central nervous system of laboratory rodents. [ABSTRACT FROM AUTHOR]

Background Hypertension is assumed to be asymptomatic. Yet, clinically significant nocturia (≥2 nightly voids) constitutes a putative symptom of uncontrolled hypertension. Black men with hypertension may be prone to nocturia because of blunted nocturnal blood pressure ( BP ) dipping, diuretic drug use for hypertension, and comorbidity that predisposes to nocturia. Here, we test the hypothesis that nocturia is a common and potentially reversible symptom of uncontrolled hypertension in black men. Methods and Results We determined the strength of association between nocturia (≥2 nightly voids) and high BP (≥135/85 mm Hg) by conducting in-person health interviews and measuring BP with an automated monitor in a large community-based sample of black men in their barbershops. Because nocturia is prevalent and steeply age-dependent after age 50 years, we studied men aged 35 to 49 years. Among 1673 black men (mean age, 43±4 years [ SD ]), those with hypertension were 56% more likely than men with normotension to have nocturia after adjustment for diabetes mellitus and sleep apnea (adjusted odds ratio, 1.56; 95% CI , 1.25-1.94 [ P

BackgroundWe developed a new model of hypertension care for non-Hispanic black men that links health promotion by barbers to medication management by American Society of Hypertension-certified pharmacists and demonstrated efficacy in a 6-month cluster-randomized trial. The marked reduction in systolic blood pressure (BP) seen at 6 months warranted continuing the trial through 12 months to test sustainability, a necessary precondition for implementation research.MethodsWe enrolled a cohort of 319 black male patrons with systolic BP ≥140 mm Hg at baseline. Fifty-two Los Angeles County barbershops were assigned to either a pharmacist-led intervention or an active control group. In the intervention group, barbers promoted follow-up with pharmacists who prescribed BP medication under a collaborative practice agreement with patrons' primary care providers. In the control group, barbers promoted follow-up with primary care providers and lifestyle modification. After BP assessment at 6 months, the intervention continued with fewer in-person pharmacist visits to test whether the intervention effect could be sustained safely for 1 year while reducing pharmacist travel time. Final BP and safety outcomes were assessed in both groups at 12 months.ResultsAt baseline, mean systolic BP was 152.4 mm Hg in the intervention group and 154.6 mm Hg in the control group. At 12 months, mean systolic BP fell by 28.6 mm Hg (to 123.8 mm Hg) in the intervention group and by 7.2 mm Hg (to 147.4 mm Hg) in the control group. The mean reduction was 20.8 mm Hg greater in the intervention (95% CI, 13.9-27.7; P

BackgroundUncontrolled hypertension is a major problem among non-Hispanic black men, who are underrepresented in pharmacist intervention trials in traditional health care settings.MethodsWe enrolled a cohort of 319 black male patrons with systolic blood pressure of 140 mm Hg or more from 52 black-owned barbershops (nontraditional health care setting) in a cluster-randomized trial in which barbershops were assigned to a pharmacist-led intervention (in which barbers encouraged meetings in barbershops with specialty-trained pharmacists who prescribed drug therapy under a collaborative practice agreement with the participants’ doctors) or to an active control approach (in which barbers encouraged lifestyle modification and doctor appointments). The primary outcome was reduction in systolic blood pressure at 6 months.ResultsAt baseline, the mean systolic blood pressure was 152.8 mm Hg in the intervention group and 154.6 mm Hg in the control group. At 6 months, the mean systolic blood pressure fell by 27.0 mm Hg (to 125.8 mm Hg) in the intervention group and by 9.3 mm Hg (to 145.4 mm Hg) in the control group; the mean reduction was 21.6 mm Hg greater with the intervention (95% confidence interval, 14.7 to 28.4; P

Hygiene management protocols in laboratory mouse husbandries worldwide most commonly employ soiled bedding-exposed sentinel mice to monitor the occurrence of infections in mouse colonies. Using this approach, sentinel mice repeatedly receive a mixture of used bedding, supplied by a variety of cages of a defined hygienic unit for a period of several months. Hereby, microorganisms shed in the used bedding can infect the sentinel animals and can be detected in subsequent health monitoring procedures. However, murine excrements carry more than only microorganisms. Mouse feces and urine also contain a multitude of olfactory molecules, which the animals use to code information about social status and context. However, if and how the persistent and repeated experience with these odor cues affects the behavior of sentinel mice, has not yet been explored. To address this question, we conducted a longitudinal study for neurochemical output parameters related to an organism's responsiveness to challenging conditions, and for the exploratory assessment of a panel of home cage behaviors in soiled bedding and control female C57BL/6J mice. We found that the number of mice showing abnormal repetitive behaviors, including barbering and bar mouthing, was lower in the soiled bedding group. While neutrophil/lymphocyte ratios and fecal corticosterone metabolites did not differ between groups, the within-group variance of the neutrophil/lymphocyte ratio was reduced in the soiled bedding group. These results show that the occurrence of abnormal repetitive behaviors is lower in sentinel than in control mice and suggest a beneficial effect of soiled bedding on the welfare of laboratory mice and on outcome variability. [ABSTRACT FROM AUTHOR]

Black men need safe spaces to express emotions free from bias and stigma. They have been underserved in emotional support due to systemic inequalities. Creating nurturing environments can empower Black men to heal from trauma. Stigma plays a crucial role in their reluctance to seek mental health treatment. This research uses a qualitative approach, combining an action research methodology with a generic qualitative inquiry. This study was conducted to answer the following research question: How can social workers and barbers collaborate to address the stigma of mental health treatment among Black men better? In this study, five social workers, five barbers, and five social work supervisors were interviewed to collect data for the study. Audio recordings were transcribed, and thematic analysis was used to analyze the interview data. Several key themes emerged: (a) collaboration strategies, (b) barbershops as safe spaces, (c) overcoming stigma, (d) cultural competence, and (e) challenges and barriers. The research study produced a pamphlet aimed at raising awareness of mental health stigma's impact on Black men. The implications for the study highlight that partnerships between social workers and barbers can play a pivotal role in dismantling stereotypes and barriers associated with mental health issues among Black men, fostering a cultural shift toward greater mental well-being, acceptance, and understanding.

Background: HIV self-testing (HIVST) offers an innovative and promising approach to increasing HIV testing among Black men in the United States, a population disproportionately affected by HIV. However, engaging Black men in traditional HIV prevention programs has been challenging due to stigma, medical mistrust, and limited access to preventive health services. This formative qualitative study aimed to explore the potential of utilizing barbershops as an example of a nontraditional healthcare venue to promote and distribute HIVST., Methods: Four virtual focus group discussions (FGDs) consisting of 19 participants in North Carolina were conducted with Black men, including barbershop business owners, barbers, and their customers, to assess perceptions of HIVST and the acceptability of partnering with barbershop businesses to promote HIVST. FGDs were digitally recorded, transcribed, and analyzed using a deductive coding approach to thematic analysis., Results: Participants reported that the trusting relationship between barbers and their customers, which may not exist between Black men and health care providers, is a facilitator of collaborating with barbershop businesses to reach Black men for HIVST distribution. Participants recommended providing education for barbers on the use of HIVST, as well as how to inform self-testers about linkage to care following HIVST to build the credibility of the barbers in delivering the intervention. Participants also raised the issue of the cost of HIVST to barbershop customers as a potential barrier to implementation, as well as the possibility that the implementation of such interventions could be seen as out of place in a barbershop business venue. Participants also expressed a strong belief that compensation to barbershops and their employees should accompany any intervention., Conclusion: These findings suggest that barbershop business venues may provide an appropriate venue for HIVST promotion and distribution, though factors like cost, training, and incentivization of implementers are necessary to consider in implementation planning. Furthermore, partnerships between public health actors and the business community must be built on equitable engagement to ensure the long-term viability of these critical initiatives., (© 2024. The Author(s).)

Hygiene management protocols in laboratory mouse husbandries worldwide most commonly employ soiled bedding-exposed sentinel mice to monitor the occurrence of infections in mouse colonies. Using this approach, sentinel mice repeatedly receive a mixture of used bedding, supplied by a variety of cages of a defined hygienic unit for a period of several months. Hereby, microorganisms shed in the used bedding can infect the sentinel animals and can be detected in subsequent health monitoring procedures. However, murine excrements carry more than only microorganisms. Mouse feces and urine also contain a multitude of olfactory molecules, which the animals use to code information about social status and context. However, if and how the persistent and repeated experience with these odor cues affects the behavior of sentinel mice, has not yet been explored. To address this question, we conducted a longitudinal study for neurochemical output parameters related to an organism’s responsiveness to challenging conditions, and for the exploratory assessment of a panel of home cage behaviors in soiled bedding and control female C57BL/6J mice. We found that the number of mice showing abnormal repetitive behaviors, including barbering and bar mouthing, was lower in the soiled bedding group. While neutrophil/lymphocyte ratios and fecal corticosterone metabolites did not differ between groups, the within-group variance of the neutrophil/lymphocyte ratio was reduced in the soiled bedding group. These results show that the occurrence of abnormal repetitive behaviors is lower in sentinel than in control mice and suggest a beneficial effect of soiled bedding on the welfare of laboratory mice and on outcome variability.

Background: The validity of the self-report questionnaire for hand eczema (HE) among Croatian hairdressers was not investigated previously, leading to uncertainty in the prevalence estimated from self-reported data., Objectives: To (1) investigate the validity of the self-report questionnaire for HE in hairdressing apprentices and (2) examine the differences between apprentices who recognised their HE symptoms and those who did not., Methods: Clinical examination for HE signs on hands and wrists was performed by the Osnabrueck Hand Eczema Severity Index for 408 apprentices at four visits covering the entire schooling period. Self-report HE was based on the Nordic Occupational Skin Questionnaire., Results: Low sensitivity (7%-37%) with high specificity (≥95%) was observed, with both measures improving from baseline to last visit. The severity of HE signs was the only factor associated with the correct identification of HE signs in analyses adjusted for previous HE signs, health-related quality of life, and atopic dermatitis (adjusted odds ratios of 1.58 with 95% confidence interval [1.06-2.35] and 1.74[1.38-2.19] at second and third follow-up visit, respectively)., Conclusions: Self-report questionnaire for HE showed low sensitivity in hairdressing apprentices, especially at the beginning of training and in those with mild symptoms. Further validation studies following questionnaire modifications aimed at adolescent population are advised., (© 2024 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)

Community-based participatory research (CBPR) using barbershop interventions is an emerging approach to address health disparities and promote health equity. Barbershops serve as trusted community settings for health education, screening services, and referrals. This narrative mini-review provides an overview of the current state of knowledge regarding CBPR employing barbershop interventions and explores the potential for big data involvement to enhance the impact and reach of this approach in combating chronic disease. CBPR using barbershop interventions has shown promising results in reducing blood pressure among Black men and improving diabetes awareness and self-management. By increasing testing rates and promoting preventive behaviors, barbershop interventions have been successful in addressing infectious diseases, including HIV and COVID-19. Barbershops have also played roles in promoting cancer screening and increasing awareness of cancer risks, namely prostate cancer and colorectal cancer. Further, leveraging the trusted relationships between barbers and their clients, mental health promotion and prevention efforts have been successful in barbershops. The potential for big data involvement in barbershop interventions for chronic disease management offers new opportunities for targeted programs, real-time monitoring, and personalized approaches. However, ethical considerations regarding privacy, confidentiality, and data ownership need to be carefully addressed. To maximize the impact of barbershop interventions, challenges such as training and resource provision for barbers, cultural appropriateness of interventions, sustainability, and scalability must be addressed. Further research is needed to evaluate long-term impact, cost-effectiveness, and best practices for implementation. Overall, barbershops have the potential to serve as key partners in addressing chronic health disparities and promoting health equity., (Copyright ©2024, Yale Journal of Biology and Medicine.)

Background: Improved screening uptake is essential for early breast cancer detection, women's health and reducing health disparities. However, minority ethnic and deprived communities often face lower breast cancer screening rates and limited access to culturally tailored educational materials. A recent review found limited culturally tailored materials for breast cancer education., Aim: To investigate the culturally appropriate interfaces and preferences of salon staff in educating their clients about breast cancer METHOD: We used a two-stage approach, following the Double Diamond framework; discover and define phases. Relevant breast cancer materials (i.e., based on cultural appropriateness, English language presentation, and alignment with the UK context) were assessed using the Suitability Assessment of Materials (SAM) toolkit. Interviews with ethnically diverse salon staff provided insights into their needs and preferences for client education materials. Thematic analysis was applied to interview transcripts., Results: Cultural appropriateness was evident in 9/14 (64%) of the materials identified (e.g., targeting black ethnicities with positive representations). Of those, six of them demonstrated an overall SAM rating of 76% ("Superior"). Thematic analysis of interviews identified seven key themes, including the importance of engagement strategies, education and awareness for health promotion, salon staff's role, preferred training methods, supportive materials, inclusivity, representation, and participant satisfaction., Conclusion: This study highlights the SAM toolkit's role in selecting suitable educational materials for breast cancer prevention. The research offers prospects for improving breast cancer awareness in ethnically diverse communities and addressing healthcare access disparities, with salon hairdressers emerging as crucial advocates for health promotion., (© British Journal of General Practice 2024.)

Background: While successful health promotion efforts among Black men have been implemented at barbershops, the focus has largely been on outcomes as opposed to the processes by which outcomes are produced. An understanding of processes can be leveraged in the design and implementation of future efforts to improve the health of Black men., Purpose: The objectives of the present study were to: (i) understand peer-derived sources of health-related support at the barbershop and (ii) understand the role of the barbershop in promoting health among Black men., Methods: Seven focus groups were conducted at barbershops used predominately by Black men. Each focus group lasted between 45 and 60 min. Using a thematic approach, each focus group was independently coded by two coders using a codebook derived from an inductive and deductive approach. The results were confirmed with members of the community advisory board., Results: Three themes emerged: (i) dynamic and candid exchange of health-related support at the barbershop; (ii) tailored forms of health-related and judgment-free communication that provide encouragement and increase motivation; and (iii) characteristics of a supportive environment at the barbershop that facilitate health-related communication., Conclusions: The findings of the present study offer a potential pathway for public health efforts seeking to improve health among Black men. Those interested in designing and implementing these efforts can create tailored programs for Black men by recognizing and leveraging the unique dynamics of health-related conversations at the barbershop., (© Society of Behavioral Medicine 2024. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)

Local barbershops, often racialized safe spaces, have long been used as sites of health interventions targeting Black American men. Here, we present findings from a barbershop intervention held in the Southeast where Black men were (1) approached using recruitment strategies informed by a community advisory board, (2) screened for type 2 diabetes, and interviewed to understand their levels of medical trust, motivation for testing in the barbershop, as well as the utility of barbershops in health promotion programming. The community advisory board consisted of five Black men from the city understudy. The intervention sample included 27 participants: 20 males and 7 females. Several men insisted on testing after their female spouses and two local women approached testers and were not denied access to screening. Themes that emerged for medical trust ranged from yes to no. Themes that emerged for motivation to screen included to know status (codes: for self, for loved ones), financial motivation (codes: free testing, incentives), risk (codes: family, race specific), referral (codes: other community member, barbershop), and convenience. Themes that emerged for the utility of barbershops in health interventions included access to people, trustworthy setting, location, and yes, they are useful with no explanation. Results show that barbershop interventions make a dynamic way to engage community members who otherwise may not trust medicine as a social structure. Results also show that future scholars and interventionists should consider gender dynamics, social class, and engaging community members as best practices in engaging Black men., (© 2023. W. Montague Cobb-NMA Health Institute.)

The purpose of this study was to assess the feasibility of using ethnic beauty salons to reach out to Vietnamese and Korean American women for cervical cancer screening education. Participants (N = 62) were conveniently recruited from ethnic beauty salons located in Albuquerque, New Mexico. Two feasibility questionnaires were separately administered to cosmetologists and their customers. Findings support the view that ethnic beauty salons can be used as a gateway to reach out to these populations, and cosmetologists have the potential to operate as community lay health workers to deliver cervical cancer screening education aimed at reducing disparities in cervical cancer and screening to their ethnic customers.

Background: In LABBPS (Los Angeles Barbershop Blood Pressure Study), pharmacist-led hypertension care in Los Angeles County Black-owned barbershops significantly improved blood pressure control in non-Hispanic Black men with uncontrolled hypertension at baseline. In this analysis, 10-year health outcomes and health care costs of 1 year of the LABBPS intervention versus control are projected.Methods: A discrete event simulation of hypertension care processes projected blood pressure, medication-related adverse events, fatal and nonfatal cardiovascular disease events, and noncardiovascular disease death in LABBPS participants. Program costs, total direct health care costs (2019 US dollars), and quality-adjusted life-years (QALYs) were estimated for the LABBPS intervention and control arms from a health care sector perspective over a 10-year horizon. Future costs and QALYs were discounted 3% annually. High and intermediate cost-effectiveness thresholds were defined as <$50 000 and <$150 000 per QALY gained, respectively.Results: At 10 years, the intervention was projected to cost an average of $2356 (95% uncertainty interval, -$264 to $4611) more per participant than the control arm and gain 0.06 (95% uncertainty interval, 0.01-0.10) QALYs. The LABBPS intervention was highly cost-effective, with a mean cost of $42 717 per QALY gained (58% probability of being highly and 96% of being at least intermediately cost-effective). Exclusive use of generic drugs improved the cost-effectiveness to $17 162 per QALY gained. The LABBPS intervention would be only intermediately cost-effective if pharmacists were less likely to intensify antihypertensive medications when systolic blood pressure was ≥150 mm Hg or if pharmacist weekly time driving to barbershops increased.Conclusions: Hypertension care delivered by clinical pharmacists in Black barbershops is a highly cost-effective way to improve blood pressure control in Black men. [ABSTRACT FROM AUTHOR]

Modeling of Alzheimer's disease (AD), classically focused on the subject-environment interaction, foresees current social neuroscience efforts as improving the predictive validity of new strategies. Here we studied social functioning among congeners in 13-14-month-old mice with normal aging in naturalistic and experimental conditions and depicted behavioral signatures of dysfunction in age-matched 3xTg-AD mice. The most sensitive variables were vibrating tail, digging, body/face and self-grooming, that can be easily used in housing routines and the assessment of strategies. Sex-specific signatures (vibrating tail, digging, and grooming) defined female 3xTg-AD mice ethogram. All animals sleep huddled while barbering was only found in females with normal aging. [ABSTRACT FROM AUTHOR]

Summary: Cutaneous expression of behavioural processes remains unexplored in donkeys. This case report describes a case of traumatic alopecia in two donkeys secondary to mutual hair plucking behaviour. Two genetically unrelated, male castrated, 4‐year‐old Cotentin donkeys living together were presented for a 2‐year history of alopecic, mainly nummular, nonpruritic lesions developing on the back, loin and croup. The general physical examination and behavioural assessment were unremarkable. Trichoscopy, scrapings and cytology were performed. Superficial bacterial infection was diagnosed but a 2‐week course of antibacterial treatment showed no improvement. Histopathological examination showed features compatible with traumatic alopecia and consistent with several behavioural causes of alopecia resembling human trichotillomania or acute traction alopecia, canine traction alopecia, feline self‐induced alopecia and murine barbering. Separation of the donkeys led to complete long‐term remission. Clinical and histopathological findings in our case share lots of similar features with the different mechanical traumatic alopecic disorders mentioned above, making it impossible to simply classify the described affection. Whether alopecic lesions resulted from an exclusive behavioural process (either abnormal excessive mutual grooming or other social interactions) or were associated with underlying causes of pruritus is uncertain. Mechanical alopecia secondary to a behavioural process should therefore be suspected in cases of permanent patchy alopecic nummular lesions on donkeys living in groups. [ABSTRACT FROM AUTHOR]

This article examines the licensing requirements imposed on the barbering profession. This profession was one of the earliest to be licensed in the U.S. since Minnesota passed the first barber licensing law in 1897. It may also be significant to notice that most states do not have formal reciprocity contracts with other states regarding the licensing of barbers. The minimum education requirement does impose considerable additional costs on the individual with an inadequate number of years of formal schooling. The evidence suggests that licensing requirements for barbers may have held down the numbers entering the trade, but only to a very small extent.

Background Trichotillomania (TTM) is an impulse control disorder characterized by repetitive hair pulling/trimming. Barbering behavior (BB) observed in laboratory animals is proposed as a model of TTM. The neurobiological basis of TTM is unclear, but involves striatal hyperactivity and hypoactivation of the prefrontal cortex. Methods In this study, we evaluated the BB in knockout mice for the inducible isoform of nitric oxide synthase (NOS2KO) and the consequences of silencing this enzyme in PC12 cell differentiation. Results NOS2KO exhibit exacerbated BB, starting four weeks of age, and increased repetitive movements compared to wild-type mice (WT). The expression of BB was attenuated by repeated treatment with clomipramine, a clinically approved drug to treat TTM in humans, or memantine, an antagonist of NMDA receptors, as well as partial rescue of NOS2 expression in haploinsufficient animals. The silencing of NOS2 expression reduced the MAP2 (microtubule-associated protein 2) levels in activity-induced differentiated PC12 cells. Discussion Our data led us to propose that NOS2 is putatively involved in the neuronal maturation of the inhibitory afferent pathways during neurodevelopment, and such inadequate inhibition of motor programs might be associated to the observed phenotype.

Intensive excavations at George Washington’s childhood home in Virginia uncovered colonial evidence of black barbering in the form of over 200 wig hair curlers, some with residues of hair powder and hairpins. The family’s 1738-74 investments in wigs, a crucial accessory of gentlemen, are documented only through archaeology, despite extensive research on Washington family history. These male hairdressers maintained the wigs of the Washington men and a clientele that included neighbors and travelers. Genteel hair relied on intimate care from enslaved hands grooming wigs and natural hair in the parlor and curling wig hair in the adjacent work yard. [ABSTRACT FROM AUTHOR]

Atp1a3 is the Na-pump alpha3 subunit gene expressed mainly in neurons of the brain. Atp1a3- deficient heterozygous mice (Atp1a3+/-) show altered neurotransmission and deficits of motor function after stress loading. To understand the function of Atp1a3 in a social hierarchy, we evaluated social behaviors (social interaction, aggression, social approach and social dominance) of Atp1a3+/- and compared the rank and hierarchy structure between Atp1a3+/- and wild-type mice within a housing cage using the round-robin tube test and barbering observations. Formation of a hierarchy decreases social conflict and promote social stability within the group. The hierarchical rank is a reflection of social dominance within a cage, which is heritable and can be regulated by specific genes in mice. Here we report: (1) The degree of social interaction but not aggression was lower in Atp1a3+/- than wild-type mice, and Atp1a3+/- approached Atp1a3+/- mice more frequently than wild type. (2) The frequency of barbering was lower in the Atp1a3+/- group than in the wild-type group, while no difference was observed in the mixed-genotype housing condition. (3) Hierarchy formation was not different between Atp1a3+/- and wild type. (4) Atp1a3+/- showed a lower rank in the mixed-genotype housing condition than that in the wild type, indicating that Atp1a3 regulates social dominance. In sum, Atp1a3+/- showed unique social behavior characteristics of lower social interaction and preference to approach the same genotype mice and a lower ranking in the hierarchy. [ABSTRACT FROM AUTHOR]

The absence of whiskers, which is associated with the features of within-group interactions in animals, can be an important factor affecting the results of tests assessing their behavior. The effects of spontaneous partial sensory deprivation due to barbering was studied in male C57Bl/6N mice using a series of behavioral tests. The results indicate that the behavior of mice without whiskers cannot be classified as anxious-depressive, though there were significant differences from the behavior of control animals in the tube, open field, social interaction, and forced swimming tests. Thus, the results provide evidence that when running behavioral tests, the state of the whiskers should be assessed before inclusion of the animals into experimental groups and/or spontaneous barbering should be considered in the statistical analysis of the data from these tests. [ABSTRACT FROM AUTHOR]

Background. Trichotillomania (TTM) is an impulse control disorder characterized by repetitive hair pulling/trimming. Barbering behavior (BB) observed in laboratory animals is proposed as a model of TTM. The neurobiological basis of TTM is unclear, but involves striatal hyperactivity and hypoactivation of the prefrontal cortex. Methods. In this study, we evaluated the BB in knockout mice for the inducible isoform of nitric oxide synthase (NOS2KO) and the consequences of silencing this enzyme in PC12 cell differentiation. Results. NOS2KO exhibit exacerbated BB, starting four weeks of age, and increased repetitive movements compared to wild-type mice (WT). The expression of BB was attenuated by repeated treatment with clomipramine, a clinically approved drug to treat TTM in humans, or memantine, an antagonist of NMDA receptors, as well as partial rescue of NOS2 expression in haploinsufficient animals. The silencing of NOS2 expression reduced the MAP2 (microtubule-associated protein 2) levels in activityinduced differentiated PC12 cells. Discussion. Our data led us to propose that NOS2 is putatively involved in the neuronal maturation of the inhibitory afferent pathways during neurodevelopment, and such inadequate inhibition of motor programs might be associated to the observed phenotype. [ABSTRACT FROM AUTHOR]