Examining the Influence of Authentic Leadership on Follower Hope and Organizational Citizenship Behavior: The Mediating Role of Follower Identification

Authentic leadership's influence on follower outcomes through the mediating roles of identification with the supervisor and social identification forms the core purpose of this research. By studying this less explored relationship within leadership studies, we aim to elucidate how these factors interrelate within the context of follower hope and organizational citizenship behavior (OCB). Using a quantitative methodology, we gathered and analyzed data from a sample of 241 employees across various South Korean businesses. Our main findings reveal that a follower's identification with the supervisor significantly mediates the relationship between perceived authentic leadership and follower outcomes, such as hope and OCB. Concurrently, the study found that strengthening employee identification with their work group positively enhances these outcomes. From these findings, we conclude that authentic leadership can effectively drive follower identification, fostering beneficial outcomes, such as hope and OCB. It also suggests that workplaces that promote authentic leadership and a culture of strong supervisor and social identification can effectively enhance overall employee well-being and organizational performance.

Transformational Leadership and Followers' Innovative Behavior: Roles of Commitment to Change and Organizational Support for Creativity

This study aims to investigate the relationships among transformational leadership, followers' innovative behavior, commitment to change, and organizational support for creativity. First, we examine the mediating role of commitment to change in the relationship between transformational leadership and followers' innovative behavior, using both objective and subjective measures. Our results reveal that commitment to change indeed mediates this relationship. Second, we analyze whether the link between commitment to change and followers' innovative behavior is moderated by organizational support for creativity. We find that this relationship is stronger for individuals with high organizational support for creativity compared to those with low support. Empirical analysis was conducted using data collected from 535 managers in 11 subsidiaries of a financial institution in South Korea. This study contributes to the management discipline by resolving mixed outcomes between transformational leadership and followers' innovation and highlighting the influence of commitment to change and perceived organizational support for creativity on innovative behavior.

Impact of authentic leadership on employee turnover intention: Perceived supervisor support as mediator and organizational identification as moderator

Authentic leadership is considered a critical factor for retaining talented employees. However, despite fruitful findings, researchers have paid little attention to how authentic leadership is associated with employee turnover intention. Drawing on organizational support theory, justice literature, and social identity theory, we examine the effects of supervisors' authentic leadership on employee turnover intention to better understand how authentic leaders reduce employees' turnover intention in Asian context. In this study, we focus on the mediating role of perceived supervisor support (PSS) and the moderating role of organizational identification in the relationship between supervisors' authentic leadership and employee turnover intention. To test our hypothesized research model, we adopted a cross-sectional design with a convenience data sampling. We also used a self-report research design in the current study. We collected data from 433 employees from several organizations in Korea. Our respondents rated their immediate supervisors' authentic leadership and their PSS, turnover intention and organizational identification. Confirmatory factor analysis, regression analysis, and moderated mediation analysis revealed that: authentic leadership negatively predicted employee turnover intention. In addition, PSS completely mediates the relationship between authentic leadership and employee turnover intention. Furthermore, organizational identification moderates the relationship between PSS and turnover intention. Lastly, organizational identification moderates the mediating effect of PSS on the relationships between perceptions of authentic leadership and employee turnover intention. Herein, we discuss the managerial implications and future research directions arising from our study.

Immunohistochemical localization of eight phospholipase C isozymes in pancreatic islets of the mouse

The possible involvement of phospholipase C (PLC) in the regulation of insulin secretion is not clearly understood and neither its isozymes expressed nor cellular localization in the pancreatic islets is known. By using specific monoclonal antibodies, we have investigated the expression and localization of eight different PLC isozymes, beta1, beta2, beta3, beta4, gamma1, gamma2, delta1, and delta2, in the pancreatic islets of adult mice. Immunohistochemical analysis carried out on paraffin embedded sections showed a distinct pattern of expression for each of the PLC isozymes. In the central part of the islets containing beta cells, a high level of beta4 and moderate levels of beta3 and gamma1 were expressed, whereas PLC-beta1 and -gamma1 were abundantly expressed in the exocrine pancreas. These results demonstrated the heterogeneity in expression of the phospholipase C isozymes in pancreatic islets. It is conceivable that these isozymes are coupled to different receptors and perform selective tasks in the regulation of insulin secretion for glucose homeostasis.

Altered nociceptive response in mice deficient in the alpha(1B) subunit of the voltage-dependent calcium channel

Calcium influx through N-type calcium channels mediates synaptic transmission at numerous central synapses and transduces nociceptive information in the spinal dorsal horn. However, the precise role of N-type calcium channels in pain perception is not fully elucidated. To address this issue, we generated and analyzed knockout mice for alpha(1B,) the pore-forming subunit of the N-type calcium channel. Homozygous mutants are viable, fertile, and show normal motor coordination. In small-diameter dorsal root ganglion neurons from mutants the density of calcium channel currents is significantly reduced, which can be accounted for by the abolition of N-type currents. We performed several pain-related behavioral tests using the mutant mice. alpha(1B)-Deficient mice show reduced response to mechanical stimuli in the von Frey test and increased tail flick latency in response to radiant heat, indicating altered spinal reflexes. However, pain response in the hot plate test is normal. In the formalin paw test, the mutant mice exhibit significantly attenuated response in Phase 2, but normal pain behaviors in Phase 1. The response to visceral inflammatory pain caused by acetic acid is also reduced in alpha(1B) knockout mice. These results suggest that the alpha(1B) subunit of N-type calcium channel plays a major role in pain perception by acting at the spinal level, but not at the supraspinal level.

Deficient long-term synaptic depression in the rostral cerebellum correlated with impaired motor learning in phospholipase C beta4 mutant mice

Long-term depression (LTD) at parallel fibre-Purkinje cell synapse of the cerebellum is thought to be a cellular substrate for motor learning. LTD requires activation of metabotropic glutamate receptor subtype 1 (mGluR1) and its downstream signalling pathways, which invariably involves phospholipase Cbetas (PLCbetas). PLCbetas consist of four isoforms (PLCbeta1-4) among which PLCbeta4 is the major isoform in most Purkinje cells in the rostral cerebellum (lobule 1 to the rostral half of lobule 6). We studied mutant mice deficient in PLCbeta4, and found that LTD was deficient in the rostral but not in the caudal cerebellum of the mutant. Basic properties of parallel fibre-Purkinje cell synapses and voltage-gated Ca2+ channel currents appeared normal. The mGluR1-mediated Ca2+ release induced by repetitive parallel fibre stimulation was absent in the rostral cerebellum of the mutant, suggesting that their LTD lesion was due to the defect in the mGluR1-mediated signalling in Purkinje cells. Importantly, the eyeblink conditioning, a simple form of discrete motor learning, was severely impaired in PLCbeta4 mutant mice. Wild-type mice developed the conditioned eyeblink response, when pairs of the conditioned stimulus (tone) and the unconditioned stimulus (periorbital shock) were repeatedly applied. In contrast, PLCbeta4 mutant mice could not learn the association between the conditioned and unconditioned stimuli, although their behavioural responses to the tone or to the periorbital shock appeared normal. These results strongly suggest that PLCbeta4 is essential for LTD in the rostral cerebellum, which may be required for the acuisition of the conditioned eyeblink response.

The biological significance of phospholipase C beta 1 gene mutation in mouse sperm in the acrosome reaction, fertilization, and embryo development

PURPOSE

We carried out this study to evaluate the biological significance of phospholipase C beta 1 gene mutation in mouse sperm in the acrosome reaction, fertilization, and embryo development.

METHODS

Study subjects were divided into two groups according to the sperm [intact phospholipase C (PLC) beta 1 and PLC beta 1-/- C57BL/6J x CBA F1 mouse sperm] used. The positive acrosome reaction rate labeled with fluorescein isothiocyanate-Pisum sativum agglutinin, the fertilization rate, and the rate of embryos developed to the stage of morula or blastocyst in the two groups were compared.

RESULTS

The mouse sperm null for the PLC beta 1 gene showed a lower acrosome reaction rate than control sperm (69.2 vs 50.9%, P < 0.05). And the fertilization rate and the rate of embryos developed to the stage of morula or blastocyst were also lower in the group using PLC beta 1-/- mouse sperm compared to the intact group (P < 0.05; 73.5 vs 51.8% and 15.7 vs 4.3%, respectively).

CONCLUSIONS

Mutation of the PLC beta 1 gene in the mouse sperm reduces the acrosome reaction rate, fertilization rate, and embryo development rate, which may be the etiologic factors responsible for the low reproductive rate of PLC beta 1-/- mouse.

Insertion of a retroviral solo long terminal repeat in mdr-3 locus disrupts mRNA splicing in mice

Previously, the abermectin-induced neurotoxicity of subpopulation of CF-1 mice was shown to be caused by the deficiency of mdr-3 P-glycoprotein. Here, we have characterized the molecular nature of the mdr-3 gene mutation in this subpopulation of CF-1 mice. The size of mdr-3 mRNA transcript from ivermectin-sensitive mutant mice was different from that of wild-type mice. Sequence analysis of RT-PCR products isolated from the mutant brain disclosed that the exon 23 of the mdr-3 gene is deleted or altered in the transcripts. The analysis of the genomic locus revealed an insertion of a solo long terminal repeat (LTR) of the ecotropic murine leukemia virus in the reverse orientation in the intron of the mdr-3 gene, causing abnormal splicing and thereby disrupting the mdr-3 gene function. In addition, histopathological analysis of the brains of the ivermectin-treated mutants revealed selective neuronal degeneration in the hippocampal CA3 region. This is the first reported case of a gene mutation induced by a solo retroviral LTR with a phenotypic consequence in the mouse, and may provide new insights into the understanding of the effects of viral solo LTR sequences on mammalian gene expression.

Ablation of P/Q-type Ca(2+) channel currents, altered synaptic transmission, and progressive ataxia in mice lacking the alpha(1A)-subunit

The Ca(2+) channel alpha(1A)-subunit is a voltage-gated, pore-forming membrane protein positioned at the intersection of two important lines of research: one exploring the diversity of Ca(2+) channels and their physiological roles, and the other pursuing mechanisms of ataxia, dystonia, epilepsy, and migraine. alpha(1A)-Subunits are thought to support both P- and Q-type Ca(2+) channel currents, but the most direct test, a null mutant, has not been described, nor is it known which changes in neurotransmission might arise from elimination of the predominant Ca(2+) delivery system at excitatory nerve terminals. We generated alpha(1A)-deficient mice (alpha(1A)(-/-)) and found that they developed a rapidly progressive neurological deficit with specific characteristics of ataxia and dystonia before dying approximately 3-4 weeks after birth. P-type currents in Purkinje neurons and P- and Q-type currents in cerebellar granule cells were eliminated completely whereas other Ca(2+) channel types, including those involved in triggering transmitter release, also underwent concomitant changes in density. Synaptic transmission in alpha(1A)(-/-) hippocampal slices persisted despite the lack of P/Q-type channels but showed enhanced reliance on N-type and R-type Ca(2+) entry. The alpha(1A)(-/-) mice provide a starting point for unraveling neuropathological mechanisms of human diseases generated by mutations in alpha(1A).

Phospholipase cbeta4 is specifically involved in climbing fiber synapse elimination in the developing cerebellum

Elimination of excess climbing fiber (CF)-Purkinje cell synapses during cerebellar development involves a signaling pathway that includes type 1 metabotropic glutamate receptor, Galphaq, and the gamma isoform of protein kinase C. To identify phospholipase C (PLC) isoforms involved in this process, we generated mice deficient in PLCbeta4, one of two major isoforms expressed in Purkinje cells. PLCbeta4 mutant mice are viable but exhibit locomotor ataxia. Their cerebellar histology, parallel fiber synapse formation, and basic electrophysiology appear normal. However, developmental elimination of multiple CF innervation clearly is impaired in the rostral portion of the cerebellar vermis, in which PLCbeta4 mRNA is predominantly expressed. By contrast, CF synapse elimination is normal in the caudal cerebellum, in which low levels of PLCbeta4 mRNA but reciprocally high levels of PLCbeta3 mRNA are found. These results indicate that PLCbeta4 transduces signals that are required for CF synapse elimination in the rostral cerebellum.

Enhanced hippocampal CA1 LTP but normal spatial learning in inositol 1,4,5-trisphosphate 3-kinase(A)-deficient mice

To define the physiological role of IP(3)3-kinase(A) in vivo, we have generated a mouse strain with a null mutation of the IP(3)3-kinase(A) locus by gene targeting. Homozygous mutant mice were fully viable, fertile, apparently normal, and did not show any morphological anomaly in brain sections. In the mutant brain, the IP4 level was significantly decreased whereas the IP3 level did not change, demonstrating a major role of IP(3)3-kinase(A) in the generation of IP4. Nevertheless, no significant difference was detected in the hippocampal neuronal cells of the wild-type and the mutant mice in the kinetics of Ca2+ regulation after glutamate stimulation. Electrophysiological analyses carried out in hippocampal slices showed that the mutation significantly enhanced the LTP in the hippocampal CA1 region, but had no effect on the LTP in dentate gyrus (DG). No difference was noted, however, between the mutant and the wild-type mice in the Morris water maze task. Our results indicate that IP(3)3-kinase(A) may play an important role in the regulation of LTP in hippocampal CA1 region through the generation of IP4, but the enhanced LTP in the hippocampal CA1 does not affect spatial learning and memory.

Perioperative care management for the patient undergoing gynecologic laparoscopy

Patients undergoing abdominal laparoscopy require a process that is systematic and thorough and that at the same time has the flexibility to adapt to each individual's needs. The use of standards of care will facilitate the delivery of care by all staff, providing important links to standardized perioperative documentation, orientation, and meeting of quality performance indicators. Two examples of standards of care are provided in this article.