Biology subjects

Ma, R. Z.

Publications and source records attributed to Ma, R. Z..

5 recordsLinked to original sources

bioRxiv2026

MS4A8B regulates Orai1-dependent Ca2+ influx to control motile cilia function in human nasal epithelial cells

Motile cilia demonstrate coordinated beating to propel fluids across epithelial tissues, and changes to their beating frequency are largely regulated by intracellular second messengers including Ca2+. In the airway epithelium, ciliary beating is essential to mucociliary clearance. Mucociliary clearance involves trapping inhaled pathogens and irritants in sticky mucus lining the airways for motile cilia to sweep away contaminated mucus, preventing infection and reducing general airway inflammation. Many chronic respiratory diseases, including chronic rhinosinusitis and asthma, are characterized by an acquired ciliary dysfunction. Despite the importance of Ca2+ signaling in cilia physiology, the identity and molecular mechanisms governing localized ciliary Ca2+ transport remain poorly understood. MS4A8B is an uncharacterized cilia-localized transmembrane protein. Other MS4A homologs have been indirectly linked to Ca2+ signaling via uncharacterized mechanisms. Using primary human nasal epithelial cells differentiated at air-liquid interface, we demonstrated that MS4A8B regulates motile cilia function. MS4A8B knockdown impairs ciliary beating and impacts cilia structure. Live-cell imaging combined with genetic analysis revealed that MS4A8B potentiates Orai1-mediated Ca2+ influx. Co-immunoprecipitation and FRET microscopy in ectopic expression systems demonstrated that MS4A8B interacts with Orai1 channels. Orai1 was further identified to reside in motile cilia of primary human nasal epithelial cells, allowing ciliary beat frequency to be stimulated by Orai1 agonists including arachidonic acid. MS4A8B functional coupling with Orai1 acts as an autonomous cilia signaling network. Targeting this compartmentalized signaling pathway offers a novel therapeutic approach to restore or enhance mucociliary clearance in airway diseases.

physiology↗

bioRxiv2022

Lidocaine Induces Apoptosis in Head and Neck Squamous Cell Carcinoma Cells Through Activation of Bitter Taste Receptor T2R14

Head and neck squamous cell carcinomas (HNSCCs) have high mortality and significant treatment-related morbidity. It is vital to discover effective, minimally invasive therapies that improve survival and quality of life. Bitter taste receptors (T2Rs) are expressed in HNSCCs and their activation can induce apoptosis. Lidocaine is a local anesthetic used in various clinical applications which can also activate bitter taste receptor 14 (T2R14). Lidocaine may have some anti-tumor effects in other cancers, but the mechanism has been mysterious. Here, we found that lidocaine causes intracellular Ca2+ mobilization through activation of T2R14 in HSNCC cells. T2R14 activation with lidocaine depolarizes the mitochondrial membrane, inhibits cell proliferation, and induces apoptosis. Concomitant mitochondrial Ca2+ influx, ROS production causes T2R14-dependent accumulation of poly-ubiquinated proteins, suggesting inhibition of the proteasome as a novel component of T2R14-induced apoptosis. Lidocaine may have therapeutic potential in HNSCC as a topical gel or intratumor injection, warranting future clinical studies. HIGHLIGHTSO_LILidocaine activates bitter taste receptor 14 (T2R14) to increase intracellular Ca2+ and decrease cAMP in head and neck squamous cell carcinoma (HSNCC) cells C_LIO_LILidocaine decreases cell viability and cell proliferation, depolarizes the mitochondrial membrane, and causes production of reactive oxygen species (ROS) C_LIO_LIT2R14 activation with lidocaine induces apoptosis and inhibits the ubiquitin proteasome system (UPS) C_LIO_LILung squamous cell carcinoma (SCC) cells and HNSCC tumor spheroids undergo apoptosis or structural disbandment, respectively, with lidocaine C_LI

cancer biology↗

bioRxiv2022

Cilia stimulatory and antibacterial activities of bitter receptor agonist diphenhydramine: insights into potential complimentary strategies for CF nasal infections

BACKGROUNDBitter compounds increase ciliary beating and nitric oxide (NO) production in nasal epithelial cells through T2Rs in motile cilia. We examined expression of cilia T2Rs and both host and bacterial responses to T2R14 agonist diphenhydramine. METHODUsing cultured human nasal epithelial cells grown at air liquid interface, we measured expression of T2Rs via qPCR. We measured effects of diphenhydramine on ciliary beat frequency via high-speed imaging and nitric oxide production via fluorescent dye DAF-FM. We measured effects of diphenhydramine on growth of lab and clinical strains of Pseudomonas aeruginosa. We measured biofilm formation of P. aeruginosa using crystal violet staining and surface attachment of P. aeruginosa to cystic fibrosis bronchial epithelial (CBFE41o-) cells using CFU counting. RESULTST2R expression increased with mucocilliary differentiation and did not vary between CF and non-CF ALIs. Treatment with P. aeruginosa flagellin decreased expression of diphenhydramine-responsive T2R14 and 40, among other isoforms. Diphenhydramine increased both NO and CBF. Increases in CBF were disrupted after flagellin treatment. Diphenhydramine impaired growth, biofilm production, and surface attachment of P. aeruginosa. CONCLUSIONST2R expression is similar between normal and CF cells but decreases with flagellin treatment. Utilizing T2R agonists as therapeutics within the context of CF, P. aeruginosa infections may require co-treatment with anti-inflammatories to prevent the reduction of T2R expression with TLR activation. T2R agonist diphenhydramine increases NO production and CBF while also decreasing bacterial growth and biofilm production, and thus diphenhydramine or derivate compounds may have potential clinical usefulness in CF infections as a topical therapy. HIGHLIGHTSO_LIT2R14 agonist diphenhydramine increases nitric oxide production and cilia beating C_LIO_LIFlagellin decreases T2R14 expression in primary airway epithelial cells C_LIO_LIT2R14 agonist Diphenhydramine inhibits Pseudomonas growth and biofilm formation C_LI

physiology↗

bioRxiv2019

Characterization of Isoforms of the Ovine Granulocyte Colony Stimulating Factor

The granulocyte colony-stimulating factor (GCSF) regulates the maturation, proliferation, and differentiation of precursor cells of neutrophilic granulocytes, and has been widely studied in several species. To investigate the function of variants of sheep GCSF (sGCSF), this study compared difference in their mRNA expression levels. Both the activity and mRNA expression level of GCSFv2 were higher than those of GCSFv1. Their sequences were aligned, which showed that they had the highest homology with bovine GCSF. Then, predicted ovine GCSF isoforms and their constant C-terminals were cloned and expressed, which were stably expressed in mammalian cells. After purification, all GCSF functions were different both in vitro and in vivo, and the GCSF C-terminal was best. These results indicated that the ability to stimulate both the proliferation and differentiation of progenitor cells and to activate the maturation of neutrophils could be used for research of efficacious non-antibiotic protein drugs. Furthermore, GCSF can be used as candidate target of genetic breeding to specifically improve sheep immunity.

genetics↗

bioRxiv2019

Network-based functional prediction augments genetic association to predict candidate genes for histamine hypersensitivity in mice

Genetic mapping is a primary tool of genetics in model organisms; however, many quantitative trait loci (QTL) contain tens or hundreds of positional candidate genes. Prioritizing these genes for validation is often ad hoc and biased by previous findings. Here we present a technique for computationally prioritizing positional candidates based on computationally inferred gene function. Our method uses machine learning with functional genomic networks, whose links encode functional associations among genes, to identify network-based signatures of functional association to a trait of interest. We demonstrate the method by functionally ranking positional candidates in a large locus on mouse Chr 6 (45.9 Mb to 127.8 Mb) associated with histamine hypersensitivity (Hhs). Hhs is characterized by systemic vascular leakage and edema in response to histamine challenge, which can lead to multiple organ failure and death. Although Hhs risk is strongly influenced by genetics, little is known about its underlying molecular or genetic causes, due to genetic and physiological complexity of the trait. To dissect this complexity, we ranked genes in the Hhs locus by predicting functional association with multiple Hhs-related processes. We integrated these predictions with new single nucleotide polymorphism (SNP) association data derived from a survey of 23 inbred mouse strains and congenic mapping data. The top-ranked genes included Cxcl12, Ret, Cacna1c, and Cntn3, all of which had strong functional associations and were proximal to SNPs segregating with Hhs. These results demonstrate the power of network-based computational methods to nominate highly plausible quantitative trait genes even in highly challenging cases involving large QTLs and extreme trait complexity.

genetics↗