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At least 613 records · Page 34Linked to original sources

Abnormal length of cilia--a cause of primary ciliary dyskinesia--a case report.

A 7-year-old Turkish boy had suffered from chronic coughing from early childhood. Severe bronchiectasis in the right lung was confirmed by bronchography. Ciliary beat frequency determined in a bronchial mucosal biopsy was markedly decreased (5.7 Hz). Electron microscopy revealed cilia with a length of 15 microns. No structural abnormality was found. A possible link between the abnormally long, slow beating cilia and the clinical symptoms is discussed.

Bronchi↗

[The immotile cilia syndrome. A rare form of male infertility].

A man presented with 100% immotile spermatozoa. Transmission electron microscopy showed the absence of both central tubules in all sperm tails; the nine peripheral tubules, dynein arms, radial spokes and other structures of the sperm tail were normal. Immotile cilia syndrome of the 9 + 0 tubular pattern was diagnosed. Other anomalies frequently associated with immotile cilia syndrome, such as recurrent airway infections, bronchiectases and situs inversus (Kartagener's syndrome), were not present in this case.

Adult↗

Immotile-cilia syndrome with azoospermia: a case report and review of the literature.

A case of immotile-cilia syndrome associated with azoospermia is presented. This diagnosis is based on a typical history of bronchitis, sinusitis, situs inversus, impaired nasal mucociliary clearance and characteristic ultrastructural defect in the respiratory tract cilia and in the sperm tail. Semen analysis showed azoospermia with no evidence of obstruction in the epididymis or vas deferens; there was normal spermatogenesis.

Adult↗

Immotile cilia syndrome associated with polycystic kidney.

The immotile cilia syndrome is an inherited disorder characterized by the inability of ciliated structures to beat effectively. The urological manifestation of this syndrome is sterility. We report a case of the immotile cilia syndrome associated with polycystic kidney, which also is a hereditary disease.

Adult↗

Function and morphology of respiratory cilia in situs inversus.

The activity and ultrastructure of respiratory cilia were studied in 13 individuals with situs inversus but without serious respiratory complaints, in 8 patients with Kartagener's syndrome and in 50 healthy controls without situs inversus. In 3 individuals with situs inversus abnormal ciliary activity was found, comparable in every aspect to the ciliary activity in patients with Kartagener's syndrome. In 4 individuals with situs inversus a dynein arm deficiency was present in the cilia, with abnormal ciliary activity in 3 of them. The number of outer dynein arms per cilium differed significantly between the 3 groups (P less than 0.02). Apparently, situs inversus without serious respiratory complaints can be associated with primary ciliary dyskinesia. Based on the findings in this study, the incidence of primary ciliary dyskinesia in the Caucasian population appears to be 1:12,500.

Adolescent↗

Visualizing odor detection in olfactory cilia by calcium imaging.

To visualize odor detection in individual cilia of olfactory sensory neurons we have developed a new approach by using high-resolution calcium imaging techniques. Laser scanning confocal microscopy revealed, for the first time, that odor stimuli induce transient Ca2+ elevations in single olfactory cilia. Pharmacological analysis indicates that these Ca2+ signals depend entirely on Ca2+ entry through activated cyclic nucleotide-gated (CNG) channels. This novel approach enables us to monitor the initial steps leading to olfactory perception in a spatially and temporally resolved manner.

Animals↗

Hydrocephalus, situs inversus, chronic sinusitis, and male infertility in DNA polymerase lambda-deficient mice: possible implication for the pathogenesis of immotile cilia syndrome.

A growing number of DNA polymerases have been identified, although their physiological function and relation to human disease remain mostly unknown. DNA polymerase lambda (Pol lambda; also known as Pol beta2) has recently been identified as a member of the X family of DNA polymerases and shares 32% amino acid sequence identity with DNA Pol beta within the polymerase domain. With the use of homologous recombination, we generated Pol lambda(-/-) mice. Pol lambda(-/-) mice develop hydrocephalus with marked dilation of the lateral ventricles and exhibit a high rate of mortality after birth, although embryonic development appears normal. Pol lambda(-/-) mice also show situs inversus totalis and chronic suppurative sinusitis. The surviving male, but not female, Pol lambda(-/-) mice are sterile as a result of spermatozoal immobility. Microinjection of sperm from male Pol lambda(-/-) mice into oocytes gives rise to normal offspring, suggesting that the meiotic process is not impaired. Ultrastructural analysis reveals that inner dynein arms of cilia from both the ependymal cell layer and respiratory epithelium are defective, which may underlie the pathogenesis of hydrocephalus, situs inversus totalis, chronic sinusitis, and male infertility. Sensitivity of Pol lambda(-/-) cells to various kinds of DNA damage is indistinguishable from that of Pol lambda(+/+) cells. Collectively, Pol lambda(-/-) mice may provide a useful model for clarifying the pathogenesis of immotile cilia syndrome.

Animals↗

The immotile cilia syndrome: radiological manifestations.

The immotile cilia syndrome (ICS) is an uncommon disorder characterized by specific and genetically determined defects of cilia that cause upper and lower respiratory disease. We reviewed the radiographic patterns in 30 patients who had ICS (15 females, 15 males) and ranged in age from newborn to 26 years. Except for two neonates, sinusitis and otitis were present in all patients. Chest radiographic abnormalities, universally present, included bronchial wall thickening, hyper-inflation, segmental atelectasis or consolidation, and segmental bronchiectasis. Situs inversus, present in 50% (7 females, 8 males), was not an essential part of this disorder. Radiologically, the disease progresses from bronchial wall thickening with or without hyperinflation, to increasing hyperinflation plus parenchymal changes including segmental atelectasis, consolidation, and bronchiectasis. There is also a predilection for anatomic middle lobe abnormalities. The radiological appearance and clinical state have similarities to cystic fibrosis, although they are less severe and less progressive. ICS should be considered in the differential diagnosis of slowly progressive chronic lung disease, sinusitis, and otitis.

Adolescent↗

Isolation and expression of the human hPF20 gene orthologous to Chlamydomonas PF20: evaluation as a candidate for axonemal defects of respiratory cilia and sperm flagella.

Primary ciliary dyskinesia (PCD) is a heterogeneous congenital disorder characterized by bronchiectasis and chronic sinusitis, sometimes associated with situs inversus (i.e., Kartagener's syndrome) and male infertility. At the cell level, the disease phenotype includes various axonemal abnormalities of respiratory cilia and sperm flagella. We have previously isolated DNAI1, the first gene involved in these diseases in patients lacking outer dynein arms. In this study, designed to find additional genes for other axonemal defects, we report the isolation of a novel human gene, hPF20, which is orthologous to Chlamydomonas pf20. The hPF20 gene is expressed as two major transcripts: one is expressed in testis only, whereas the second is weakly expressed in many other tissues. As flagella of Chlamydomonas strains carrying pf20 mutations lack the axonemal central complexes, we tested the involvement of the hPF20 gene in the disease phenotype of five patients in whom cilia or flagella display abnormal central complexes. Five intragenic polymorphisms were identified and used to exclude hPF20 in two consanguineous patients, while no mutation was found in the remaining patients. However, given the genetic heterogeneity of PCD, we consider that this gene remains a good candidate to be investigated in patients with abnormal central complexes.

Adult↗

[Association between heroin consumption in pregnancy and structural abnormalities of the respiratory cilia in newborn infants].

OBJECTIVE: To describe structural abnormalities of the respiratory cilia in newborn infants whose mothers consumed heroin during pregnancy. PATIENTS AND METHODS: The medical records of 295 newborn infants whose mothers consumed heroin either throughout or at some time during pregnancy and who were cared for in Hospital del Mar in Barcelona (Spain) between January 1982 and December 1997 were reviewed. Seven infants with neonatal respiratory distress after the withdrawal syndrome period were selected. Diagnoses were established by electron microscopy of nasal mucosa samples. RESULTS: All seven newborns with prolonged neonatal respiratory distress had ultrastructural abnormalities of the ciliary axoneme similar to those of primary ciliary dyskinesia or immotile cilia syndrome. The incidence of this alteration in this series was higher than that in the general population. CONCLUSIONS: These data suggest a possible association between ultrastructural abnormalities of the ciliary axoneme and prolonged neonatal respiratory distress in the infants of heroin-consuming mothers.

Ciliary Motility Disorders↗

Leukocyte locomotory function in children with the immotile cilia syndrome.

The random motility of polymorphonuclear leucocytes (PMN), cellular chemotaxis and chemokinesis in kinetic fashion in 4 patients with immotile cilia syndrome (ICS) have been evaluated. No impairment of granulocyte ability of orientation and migration was found. Ultrastructural alterations of cilia which are the primary factor in the pathogenesis of respiratory tract disease in patients with ICS do not impair the PMN function.

Adolescent↗

Clinical, pathologic, and ultrastructural features of situs inversus and immotile-cilia syndrome in a dog.

Situs inversus, rhinitis, and bronchitis were diagnosed in a 7-month-old male Golden Retriever. Electron microscopic examination of tracheal and bronchial biopsy specimens revealed 9% of the cilia with abnormal axonemal pattern and 1.2% with a fibrous ring between the circle of microtubular doublets and the cell membrane. A permanent response to treatment with antibiotics was not obtained and the dog was euthanatized. At necropsy the thoracic and abdominal organs were found to be in reversed position. Microscopic examination revealed evidence of chronic bronchitis as well as cystic and distended distal tubules of the kidneys. Foci of fibrosis were observed in the renal cortex. The diagnosis was immotile-cilia syndrome.

Animals↗

THE STRUCTURE AND FORMATION OF CILIA AND FILAMENTS IN RUMEN PROTOZOA.

The large oligotrich rumen protozoa Diplodinium ecaudatum and Ophryoscolex caudatus have been studied by electron microscopy during interphase and division. The structure of mature cilia is contrasted with that seen during their formation particularly in a tuft where development lags and is arrested. Here the shaft is only a few micra long and is composed of filaments that have circular cross-sections not in the typical circular arrangement. In their diameter and appearance the filaments are similar to filaments associated with the nuclei during division. The macronucleus has within it randomly directed filaments, while the micronucleus contains well aligned filaments and other arrangements typical of an intranuclear mitotic process. An extranuclear filament system is also present and is elaborated during division. The infraciliary filament system is particularly elaborate in these organisms. Filaments ranging from 14 to 22 mmicro have been observed with some tendency for a bimodal distribution in diameters of 15 and 21 mmicro. Formation of such filaments has been observed and consists of an initial orientation of very fine elements followed by filament formation. The observations are discussed in relation to filament involvements in cell movements. The concepts are discussed that filaments are metastable structures and that the transitions from one state to another are functionally significant.

Animals↗

SEROTONIN AND ADENOSINE TRIPHOSPHATE: SYNERGISTIC EFFECT ON THE BEAT FREQUENCY OF CILIA OF MUSSEL GILLS.

For each tenfold increase in the concentration of serotonin in the range 10(-7) to 10(-4)M, the beat frequency of the lateral cilia of the gills of the freshwater mussel Elliptio complanatus increases by approximately two beats per second over the mean frequency of 14.5 beats per second for control gills perfused with 0.04M potassium chloride. The addition of 10(-6) to 10(-3)M concentrations of adenosine triphosphate has no detectable effect on the beat frequency. The addition of both serotonin and 10(-4)M adenosine triphosphate increases the frequency by two beats per second more than does the addition of serotonin alone.

Adenosine Triphosphate↗

Ultrastructure of the stroma of nasal polyps: cilia in stromal fibroblasts.

Ultrastructural examination of the stroma of simple nasal polyps was shown that there is an edematous framework of fibroblasts with abundant interdigitating cytoplasmic processes, a plexus of inflamed blood vessels, and a mixed infiltrate of active inflammatory cells. Solitary cilia were seen to arise from the stromal mesenchymal cells; no mycoplasma or viral inclusions were present. These features may have a relationship to the pathogenesis of nasal polyps. An immunologically induced liberation of vasoactive amines from mast cells results in increased capillary permeability and a consequent excess of intracellular fluid; the stromal cells attempt to check this expansion by an increase in collagen synthesis.

Basement Membrane↗

Effects of hydrocortisone on the formation of gap junctions and the abnormal growth of cilia within the rat anterior pituitary gland: possible role of gap junctions on the regulation of cell development.

We investigated the effects of hydrocortisone on the formation of gap junctions in and the growth of cilia on folliculo-stellate cells. The male rats of experimental groups were given daily intraperitoneal injections of 5 mg/kg of hydrocortisone from Day 20 to 60. Five rats were killed at ages 10, 20, 30 and 40 days after initiation of injections, and the pituitary gland was removed from each rat. Then, the specimens were prepared for observation by transmission electron microscopy. A delay in the formation of gap junctions between folliculo-stellate cells was observed in hydrocortisone treated rats compared with control rats on Day 30, 40 and 50. Another finding in the present study was the increase of ciliated follicles on Day 40 and 50 in the hydrocortisone treated groups, simultaneous with the delay in gap junction formation. The results suggest that hydrocortisone has a suppressive effect on the gap junction formation between folliculo-stellate cells, and loss of intercellular communication by way of gap junctions may lead to alteration of morphological development of the cell.

Age Factors↗

Polycystins and mechanosensation in renal and nodal cilia.

The external surfaces of the human body, as well as its internal organs, constantly experience different kinds of mechanical stimulations. For example, tubular epithelial cells of the kidney are continuously exposed to a variety of mechanical forces, such as fluid flow shear stress within the lumen of th nephron. The majority of epithelial cells along the nephron, except intercalated cells, possess a primary cilium, an organelle projecting from the cell's apical surface into the luminal space. Despite its discovery over 100 years ago, the primary cilium's function continued to elude researchers for many decades. However, recent studies indicate that renal cilia have a sensory function. Studies on polycystic kidney disease (PKD) have identified many of the molecular players, which should help solve the mystery of how the renal cilium senses fluid flow. In this review, we will summarize the recent breakthroughs in PKD research and discuss the role(s) of the polycystin signaling complex in mediating mechanosensory function by the primary cilium of renal epithelium as well as of the embryonic node.

Animals↗

Requirement for the betaI and betaIV tubulin isotypes in mammalian cilia.

Nielsen et al., [2001: Curr Biol 11:529-533], based on studies in Drosophila, have proposed that beta tubulin in axonemal microtubules must contain a specific acidic seven amino acid sequence in its carboxyl terminus. In mammals, the two betaIV isotypes (betaIVa and betaIVb) contain that sequence. In order to test the application of this hypothesis to mammals, we have examined the expression of beta tubulin isotypes in four different ciliated tissues (trachea, ependyma, uterine tube, and testis) using isotype-specific antibodies and indirect immunofluorescence. We find that betaIV tubulin is present in all ciliated cell types examined, but so is betaI tubulin. Taken together with recent studies that show that betaI and betaIV tubulin are both present in the cilia of vestibular hair cells, olfactory neurons, and nasal respiratory epithelial cells, we propose that both betaI tubulin and betaIV tubulin may be required for axonemal structures in mammals.

Animals↗