Expression Of Type-specific Mhc Isoforms In Rat Intrafusal Muscle-fibers
cat; Cell Biology; differentiation; fiber types; histochemistry; identification; immunocytochemistry; innervation; intrafusal; monoclonal antimyosin antibodies; monoclonal-antibody; motor; muscle fiber typing; muscle spindles; myosin heavy-chain; rat skeletal muscle; skeletal-muscle; spindles
Myosin heavy chain (MHC) expression by intrafusal fibers was studied by immunocytochemistry to determine how closely it parallels MHC expression by extrafusal fibers in the soleus and tibialis anterior muscles of the rat. Among the MHC isoforms expressed in extrafusal fibers, only the slow-twitch MHC of Type 1 extrafusal fibers was expressed along much of the fibers. Monoclonal antibodies (MAb) specific for this MHC bound to the entire length of bag2 fibers and the extracapsular region of bag1 fibers. The fast-twitch MHC isoform strongly expressed by bag2 and chain fibers had an epitope not recognized by MAb to the MHC isoforms characteristic of developing muscle fibers or the three subtypes (2A, 2B, 2X) of Type 2 extrafusal fibers. Therefore, intrafusal fibers may express a fast-twitch MHC that is not expressed by extrafusal fibers. Unlike extrafusal fibers, all three intrafusal fiber types bound MAb generated against mammalian heart and chicken limb muscles. The similarity of the fast-twitch MHC of bag2 and chain fibers and the slow-tonic MHC of bag1 and bag2 fibers to the MHC isoforms expressed in avian extrafusal fibers suggests that phylogenetically primitive MHCs might persist in intrafusal fibers. Data are discussed relative to the origin and regional regulation of MHC isoforms in intrafusal and extrafusal fibers of rat hindlimb muscles.
Kucera J; Walro J M; Gorza L
Journal of Histochemistry & Cytochemistry
1992
1992-02
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1177/40.2.1552171" target="_blank" rel="noreferrer noopener">10.1177/40.2.1552171</a>
Transient Expression Of A Slow-tonic Mhc Isoform By Extrafusal Fibers In The Developing Rat
Anatomy & Morphology; denervation; Developmental Biology; diversity; extrafusal fibers; intrafusal fibers; intrafusal muscle-fibers; monoclonal-antibody; motor innervation; muscle; myosin heavy-chain; neonatal rats; skeletal-muscle; slow-tonic myosin; spindles
ALD 19, a monoclonal antibody that recognizes the slow-tonic myosin heavy chain (MHC) isoform, has been used extensively as a marker for nuclear bag intrafusal fibers of muscle spindles in developing and adult rats. Extrafusal fibers of adult rat hindlimb muscles do not express slow-tonic MHC. However, while using ALD 19 to trace the fate of intrafusal fibers following neonatal denervation, we noted that some extrafusal fibers of neonates also bound this antibody. The immunolabeled extrafusal fibers were a subset of slow fibers located in the deep axial regions of crural muscles. The same fiber subset transiently displayed a weak affinity for ALD 19 during the first postnatal week in normal muscles. Denervation at birth increased the intensity of ALD 19 immunolabelling by these extrafusal fibers and extended the duration of the slow-tonic immunoreactivity into the 2nd postnatal week, after which expression diminished or ceased. Demonstration that some developing extrafusal fibers have a nerve-independent capacity for transiently expressing slow-tonic MHC, an MHC previously thought to be expressed only by intrafusal fibers, raises the possibility that both types of fiber originate from a subset of bipotential slow primary myotubes in rat hindlimbs.
Kucera J; Walro J M
Anatomy and Embryology
1993
1993-10
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1007/bf00185950" target="_blank" rel="noreferrer noopener">10.1007/bf00185950</a>
Class Iii Beta-tubulin Is Constitutively Coexpressed With Glial Fibrillary Acidic Protein And Nestin In Midgestational Human Fetal Astrocytes: Implications For Phenotypic Identity
adult mammalian; astrocytes; brain; class III beta-tubulin; fetal glia; gamma-tubulin; glial fibrillary acidic; microtubule associated protein 2; microtubule associated protein 2; monoclonal-antibody; nestin; neural stem cells; neural stem cells; neuronal differentiation; Neurosciences & Neurology; Pathology; posttranslational modification; protein; radial glia; spinal cord; subventricular zone; ventricular/subventricular zone
Draberova E; Del Valle L; Gordon J; Markova V; Smejkalova B; Bertrand L; de Chadarevian J P; Agamanolis D P; Legido A; Khalili K; Draber P; Katsetos C D
Journal of Neuropathology and Experimental Neurology
2008
2008-04
Journal Article or Conference Abstract Publication
<a href="http://doi.org/10.1097/NEN.0b013e31816a686d" target="_blank" rel="noreferrer noopener">10.1097/NEN.0b013e31816a686d</a>
Risk factors for domestic acquisition of Legionnaires disease
community-acquired pneumonia; cooling-tower; evaporative condenser; General & Internal Medicine; hot; legionella-pneumophila serogroup-1; monoclonal-antibody; outbreak; potable water; tap water; united-states; water-systems
Background: Legionnaires disease is a common cause of adult pneumonia. Outbreaks of legionnaires disease have been well described, but little is known about sporadically occurring legionnaires disease, which accounts for most infections. Exposure to contaminated residential water sources is 1 plausible means of disease acquisition. Methods: Employing a matched case-control study design in 15 hospitals in 2 Ohio counties, we prospectively enrolled 146 adults diagnosed as having nonepidemic, community-acquired legionnaires disease and compared each with 2 hospital-based control patients, matched for age, sex, and underlying illness category. An interview regarding potential exposures was followed by a home survey that included sampling residential sources for Legionella. Interview and home survey data were analyzed to estimate the risk of acquiring legionnaires disease associated with various exposures. Results: Multivariate analysis showed that a nonmunicipal water supply (odds ratio [OR], 2.26; 95% confidence interval [CI], 1.17-4.37), recent residential plumbing repair (OR, 2.39; 95% CI, 1.10-5.18), and smoking (OR, 3.48; 95% CI, 2.09-5.79) were independent risk factors for legionnaires disease. Univariate analysis suggested that electric (vs gas) water heaters (OR, 1.97; 95% CI, 1.10-3.52), working more than 40 hours weekly (OR, 2.13; 95% CI, 1.12-4.07), and spending nights away from home before illness (OR, 1.68; 95% CI, 1.03-2.74) were additional possible risk factors. Lower chlorine concentrations in potable water and lower water heater temperatures were associated with residential Legionella colonization. Conclusions: A proportion of sporadic cases of legionnaires disease may be residentially acquired and are associated with domestic potable water and disruptions in residential plumbing systems. Potential strategies to reduce legionnaires disease risk include consistent chlorination of potable water, increasing water heater temperatures, and limiting exposure to aerosols after domestic plumbing repairs.
Straus W L; Plouffe J F; File T M; Lipman H B; Hackman B H; Salstrom S J; Benson R F; Breiman R F; Baird I; Emerick J; Gianakopoulos G; Herbert M; Parsons J; Anderson C J; Bollin G E; Farkas S A; Francis S J; Gardner W G; Myers J P; Signs D J; Tan J S; Thomson R B; Barbaree J; Fields B; Morrill W; Moyenuddin M; Pruckler J; StJohn A
Archives of Internal Medicine
1996
1996-08
Journal Article
<a href="http://doi.org/10.1001/archinte.156.15.1685" target="_blank" rel="noreferrer noopener">10.1001/archinte.156.15.1685</a>